Energy Impact Partners’ ERock (EROC) Schedule 13D shows 78% control stake

Rhea-AI Filing Summary

Energy Impact Partners-affiliated entities report a controlling stake in ERock, Inc. following its IPO. Energy Impact Partners LLC and related funds, together with Hans Kobler, report beneficial ownership of 102,813,846 shares on an as-converted basis, representing 78.1% of ERock’s Class A common stock.

The position combines 19,350,897 Class A shares held by Energy Impact Fund (FT-B), 83,355,210 Class B shares and corresponding Class B Units held by EIP Flagship Fund I ER Holdings, and 107,739 Class A shares underlying vested Class M Units. Class B Units are exchangeable one-for-one into Class A shares, with Class B shares cancelled upon exchange, and Class M Units are convertible into Class B Units without expiration.

The Schedule 13D explains that these interests arose from pre-IPO investments in Enchanted Rock Holdings, LLC and several convertible note financings, followed by conversions and “blocker” mergers completed around ERock’s June 2026 offering. It also notes a Registration Rights Agreement giving holders demand and piggyback registration rights, and 180-day lock-up agreements restricting sales by Flagship, FT-B and Mr. Kobler after the underwriting agreement date.

Insights

Equity ownership & governance analyst

Schedule 13D confirms ERock’s post-IPO control by Energy Impact Partners-affiliated vehicles.

The disclosure shows Energy Impact Partners LLC and its affiliated funds, plus Hans Kobler, collectively beneficially own 102,813,846 shares on an as-converted basis, or 78.1% of ERock’s Class A common stock. This includes large blocks of Class B Units that can convert into Class A shares.

Control is exercised through layered entities (FT-B, Flagship, EIF ER Holdings, FT-D) with voting and investment decisions made by a seven-member investment committee at Energy Impact Partners. Members, including Kobler, Lindsay Luger and Sameer Reddy, disclaim beneficial ownership beyond their pecuniary interests, but the structure still concentrates effective voting power.

The statement also highlights prior convertible note investments totaling $35.3 million and IPO-related transactions, including a $27.8 million cash payment to FT-B and $119.9 million used to repurchase 6,041,206 Class B Units. A 180-day lock-up and registration rights could shape future liquidity once restrictions expire, while any changes in conversion or sale decisions would appear in subsequent disclosures.

Key Figures

Beneficial ownership: 102,813,846 shares Percent of class: 78.1% Shares outstanding: 48,174,023 shares +5 more

8 metrics

Beneficial ownership 102,813,846 shares Shares beneficially owned by all reporting persons; 78.1% of Class A

Percent of class 78.1% Percent of ERock Class A common stock represented by 102,813,846 shares

Shares outstanding 48,174,023 shares Class A shares outstanding as of June 11, 2026, after offering

FT-B Class A stake 19,350,897 shares Class A common stock held by Energy Impact Fund (FT-B)

Flagship as-converted stake 83,462,949 shares Shares beneficially owned by Flagship/EIF ER Holdings/FT-D on as-converted basis

Convertible note investments $35.3 million $10.0M December 2024 note, $10.0M additional 2024 notes, $15.3M 2025 notes

Cash to FT-B $27.8 million Cash consideration to FT-B from IPO net proceeds in blocker mergers

Repurchase of Class B Units $119.9 million / 6,041,206 units IPO net proceeds used by ERock to buy Class B Units from Flagship

Key Terms

Class B Units, Class M Units, Registration Rights Agreement, lock-up agreements, +2 more

6 terms

Class B Units financial

"The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock"

Class M Units financial

"Vested Class M Units are convertible, at the holder's option, into a number of Class B Units"

Registration Rights Agreement regulatory

"The Reporting Persons and certain of the Issuer's other investors entered into the Registration Rights Agreement, dated June 11, 2026"

A registration rights agreement is a contract that gives investors the option to have their ownership stakes officially registered with the government, making it easier to sell their shares later. This agreement matters because it provides investors with a clearer path to cash out their investments if they choose, offering more liquidity and confidence in their ability to sell their holdings when desired.

lock-up agreements financial

"Flagship, FT-B and Mr. Kobler entered into lock-up agreements, substantially in the form attached as Exhibit A"

A lock-up agreement is a contract that prevents company insiders—founders, employees, and early investors—from selling their shares for a set period after a public stock offering. It matters to investors because it keeps a large block of shares off the market temporarily; when the lock-up ends, those holders can sell and this increased supply can cause the stock price to fall, similar to a timed release that suddenly opens a valve.

Blocker Mergers financial

"EIF ER Blocker LLC merged with and into the Issuer pursuant to the Blocker Mergers"

Schedule 13D regulatory

"This Statement is being filed by EIP Flagship Fund I ER Holdings LLC and others on Schedule 13D"

A Schedule 13D is a legal document that investors file with regulators when they buy a large enough stake in a company to potentially influence its management or decisions. It provides details about the investor’s intention, ownership stake, and plans, helping other investors understand who is gaining control and what their motives might be.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

ERock, Inc.

(Name of Issuer)

Class A common stock, $0.01 par value per share

(Title of Class of Securities)

296013105

(CUSIP Number)

Joshua J. Feldman
c/o Energy Impact Partners LLC, 600 Third Avenue, 38th Floor
New York, NY, 10016
212-899-9700

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

06/11/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

schemaVersion:

SCHEDULE 13D

CUSIP Number(s): 296013105

1

Name of reporting person

Energy Impact Partners LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 102,813,846.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 102,813,846.00

11

Aggregate amount beneficially owned by each reporting person

102,813,846.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

78.1 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Consists of (i) 19,350,897 shares of Class A common stock (as defined in Item 1(a)) held by FT-B (as defined in Item 2(a)), (ii) 83,355,210 shares of Class B common stock (the "Class B common stock") and 83,355,210 corresponding Class B Units of Enchanted Rock Holdings, LLC ("ER Holdings") held by Flagship (as defined in Item 2(a)) and (iii) 107,739 shares of Class A common stock underlying 111,545 Class M Units of ER Holdings, all of which are vested. The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer (as defined in Item 1(b)). Upon exchange of a Class B Unit, an equivalent number of shares of Class B common stock will be automatically cancelled. Vested Class M Units are convertible, at the holder's option, into a number of Class B Units generally equal to the product of (a) the number of vested Class M Units to be converted, and (b) a fraction, the numerator of which is the amount that would be distributed in respect of the vested Class M Unit (taking into account the applicable threshold amount), and the denominator of which is the amount that would be distributed in respect of a Class B Unit, in each case if, immediately before the exchange, ER Holdings were to sell all of its assets for their fair market values, pay any liabilities, and distribute the proceeds available for distribution, subject to certain adjustments. Class M Units have no expiration date. Each of EIF ER Holdings (as defined in Item 2(a)), as the sole owner of Flagship), FT-D (as defined in Item 2(a)), as owner of EIF ER Holdings) and EIP LLC (as defined in Item 2(a)), as the managing member of EIF ER Holdings and the general partner of FT-D) and Hans Kobler (as managing member of EIP LLC) may be deemed to have voting and dispositive power over the shares held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and Mr. Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this footnote are made by the investment committee of Energy Impact Partners LLC, which comprises seven individuals, including Mr. Kobler, Lindsay Luger ("Ms. Luger") and Sameer Reddy ("Mr. Reddy"), each of whom is a member of the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this footnote except to the extent of his or her pecuniary interest therein. Based on 48,174,023 shares of Class A common stock outstanding as of June 11, 2026, following the closing of the Issuer's initial public offering of its Class A common stock (the "Offering"), as reported by the Issuer in its prospectus filed with the United States Securities and Exchange Commission (the "Commission") on June 10, 2026 (the "Prospectus"), assuming no exercise of the underwriters' option to purchase 4,186,046 additional shares of Class A common stock (the "Underwriters' Option").

SCHEDULE 13D

CUSIP Number(s): 296013105

1

Name of reporting person

Energy Impact Fund (FT-B) LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 19,350,897.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 19,350,897.00

11

Aggregate amount beneficially owned by each reporting person

19,350,897.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

40.2 %

14

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person:

Consists of 19,350,897 shares of Class A common stock held by FT-B. Each of EIP LLC (as the general partner of FT-B) and Mr. Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this footnote are made by the investment committee of Energy Impact Partners LLC, which comprises seven individuals, including Mr. Kobler, Ms. Luger and Mr. Reddy, each of whom is a member of the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this footnote except to the extent of his or her pecuniary interest therein. Based on 48,174,023 shares of Class A common stock outstanding as of June 11, 2026, following the closing of the Offering, as reported by the Issuer in the Prospectus, assuming no exercise of the Underwriters' Option.

SCHEDULE 13D

CUSIP Number(s): 296013105

1

Name of reporting person

EIP Flagship Fund I ER Holdings LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 83,462,949.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 83,462,949.00

11

Aggregate amount beneficially owned by each reporting person

83,462,949.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

63.4 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Consists of (i) 83,355,210 shares of Class B common stock and 83,355,210 corresponding Class B Units held by Flagship and (ii) 107,739 shares of Class A common stock underlying 111,545 Class M Units, all of which are vested. The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, an equivalent number of shares of Class B common stock will be automatically cancelled. Vested Class M Units are convertible, at the holder's option, into a number of Class B Units generally equal to the product of (a) the number of vested Class M Units to be converted, and (b) a fraction, the numerator of which is the amount that would be distributed in respect of the vested Class M Unit (taking into account the applicable threshold amount), and the denominator of which is the amount that would be distributed in respect of a Class B Unit, in each case if, immediately before the exchange, ER Holdings were to sell all of its assets for their fair market values, pay any liabilities, and distribute the proceeds available for distribution, subject to certain adjustments. Class M Units have no expiration date. Each of EIF ER Holdings (as the sole owner of Flagship), FT-D (as owner of EIF ER Holdings) and EIP LLC (as the managing member of EIF ER Holdings and the general partner of FT-D) and Mr. Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may be deemed to have voting and dispositive power over the shares held by Flagship. Voting and investment decisions with respect to the securities described in this footnote are made by the investment committee of Energy Impact Partners LLC, which comprises seven individuals, including Mr. Kobler, Ms. Luger and Mr. Reddy, each of whom is a member of the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this footnote except to the extent of his or her pecuniary interest therein. Based on 48,174,023 shares of Class A common stock outstanding as of June 11, 2026, following the closing of the Offering, as reported by the Issuer in the Prospectus, assuming no exercise of the Underwriters' Option.

SCHEDULE 13D

CUSIP Number(s): 296013105

1

Name of reporting person

EIF ER Holdings LLC

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 83,462,949.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 83,462,949.00

11

Aggregate amount beneficially owned by each reporting person

83,462,949.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

63.4 %

14

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person:

Consists of (i) 83,355,210 shares of Class B common stock and 83,355,210 corresponding Class B Units held by Flagship and (ii) 107,739 shares of Class A common stock underlying 111,545 Class M Units, all of which are vested. The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, an equivalent number of shares of Class B common stock will be automatically cancelled. Vested Class M Units are convertible, at the holder's option, into a number of Class B Units generally equal to the product of (a) the number of vested Class M Units to be converted, and (b) a fraction, the numerator of which is the amount that would be distributed in respect of the vested Class M Unit (taking into account the applicable threshold amount), and the denominator of which is the amount that would be distributed in respect of a Class B Unit, in each case if, immediately before the exchange, ER Holdings were to sell all of its assets for their fair market values, pay any liabilities, and distribute the proceeds available for distribution, subject to certain adjustments. Class M Units have no expiration date. Each of EIF ER Holdings (as the sole owner of Flagship), FT-D (as owner of EIF ER Holdings) and EIP LLC (as the managing member of EIF ER Holdings and the general partner of FT-D) and Mr Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may be deemed to have voting and dispositive power over the shares held by Flagship. Voting and investment decisions with respect to the securities described in this footnote are made by the investment committee of Energy Impact Partners LLC, which comprises seven individuals, including Mr. Kobler, Ms. Luger and Mr. Reddy, each of whom is a member of the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this footnote except to the extent of his or her pecuniary interest therein. Based on 48,174,023 shares of Class A common stock outstanding as of June 11, 2026, following the closing of the Offering, as reported by the Issuer in the Prospectus, assuming no exercise of the Underwriters' Option.

SCHEDULE 13D

CUSIP Number(s): 296013105

1

Name of reporting person

Energy Impact Fund (FT-D) LP

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 83,462,949.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 83,462,949.00

11

Aggregate amount beneficially owned by each reporting person

83,462,949.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

63.4 %

14

Type of Reporting Person (See Instructions)

PN

Comment for Type of Reporting Person:

Consists of (i) 83,355,210 shares of Class B common stock and 83,355,210 corresponding Class B Units held by Flagship and (ii) 107,739 shares of Class A common stock underlying 111,545 Class M Units, all of which are vested. The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer. Upon exchange of a Class B Unit, an equivalent number of shares of Class B common stock will be automatically cancelled. Vested Class M Units are convertible, at the holder's option, into a number of Class B Units generally equal to the product of (a) the number of vested Class M Units to be converted, and (b) a fraction, the numerator of which is the amount that would be distributed in respect of the vested Class M Unit (taking into account the applicable threshold amount), and the denominator of which is the amount that would be distributed in respect of a Class B Unit, in each case if, immediately before the exchange, ER Holdings were to sell all of its assets for their fair market values, pay any liabilities, and distribute the proceeds available for distribution, subject to certain adjustments. Class M Units have no expiration date. Each of EIF ER Holdings (as the sole owner of Flagship), FT-D (as owner of EIF ER Holdings) and EIP LLC (as the managing member of EIF ER Holdings and the general partner of FT-D) and Mr. Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may be deemed to have voting and dispositive power over the shares held by Flagship. Voting and investment decisions with respect to the securities described in this footnote are made by the investment committee of Energy Impact Partners LLC, which comprises seven individuals, including Mr. Kobler, Ms. Luger and Mr. Reddy, each of whom is a member of the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this footnote except to the extent of his or her pecuniary interest therein. Based on 48,174,023 shares of Class A common stock outstanding as of June 11, 2026, following the closing of the Offering, as reported by the Issuer in the Prospectus, assuming no exercise of the Underwriters' Option.

SCHEDULE 13D

CUSIP Number(s): 296013105

1

Name of reporting person

Hans Kobler

2

Check the appropriate box if a member of a Group (See Instructions)

(a)
(b)

3

SEC use only

4

Source of funds (See Instructions)

OO

5

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

6

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 102,813,846.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 102,813,846.00

11

Aggregate amount beneficially owned by each reporting person

102,813,846.00

12

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

13

Percent of class represented by amount in Row (11)

78.1 %

14

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person:

Consists of (i) 19,350,897 shares of Class A common stock (as defined in Item 1(a)) held by FT-B (as defined in Item 2(a)), (ii) 83,355,210 shares of Class B common stock and 83,355,210 corresponding Class B Units held by Flagship (as defined in Item 2(a)) and (iii) 107,739 shares of Class A common stock underlying 111,545 Class M Units, all of which are vested. The Class B Units are exchangeable, at the holder's option, on a one-for-one basis into shares of Class A common stock of the Issuer (as defined in Item 1(b)). Upon exchange of a Class B Unit, the corresponding share of Class B common stock will be automatically cancelled. Vested Class M Units are convertible, at the holder's option, into a number of Class B Units generally equal to the product of (a) the number of vested Class M Units to be converted, and (b) a fraction, the numerator of which is the amount that would be distributed in respect of the vested Class M Unit (taking into account the applicable threshold amount), and the denominator of which is the amount that would be distributed in respect of a Class B Unit, in each case if, immediately before the exchange, ER Holdings were to sell all of its assets for their fair market values, pay any liabilities, and distribute the proceeds available for distribution, subject to certain adjustments. Class M Units have no expiration date. Each of EIF ER Holdings (as the sole owner of Flagship), FT-D (as owner of EIF ER Holdings), EIP LLC (as the managing member of EIF ER Holdings and the general partner of FT-D) and Mr. Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may be deemed to have voting and dispositive power over the shares held by Flagship. Each of FT-B, EIP LLC (as the general partner of FT-B) and Mr. Kobler, a member of the Issuer's Board and the managing member of EIP LLC, may also be deemed to be the beneficial owners having shared voting power and shared investment power of the securities held by FT-B. Voting and investment decisions with respect to the securities described in this footnote are made by the investment committee of Energy Impact Partners LLC, which comprises seven individuals, including Mr. Kobler, Ms. Luger and Mr. Reddy, each of whom is a member of the Issuer's Board. Each member of this investment committee disclaims beneficial ownership of all securities described by this footnote except to the extent of his or her pecuniary interest therein. Based on 48,174,023 shares of Class A common stock outstanding as of June 11, 2026, following the closing of the Offering, as reported by the Issuer in the Prospectus, assuming no exercise of the Underwriters' Option.

SCHEDULE 13D

Item 1.	Security and Issuer
(a)	Title of Class of Securities: Class A common stock, $0.01 par value per share
(b)	Name of Issuer: ERock, Inc.
(c)	Address of Issuer's Principal Executive Offices: 1113 Vine St., Suite 101, Houston, TEXAS , 77002.
Item 2.	Identity and Background
(a)	This Statement ("Statement") is being filed by EIP Flagship Fund I ER Holdings LLC ("Flagship"), EIF ER Holdings LLC ("EIF ER Holdings"), Energy Impact Fund (FT-B) LP ("FT-B"), Energy Impact Fund (FT-D) LP ("FT-D"), Energy Impact Partners LLC ("EIP LLC", and together with Flagship, EIR ER Holdings, FT-B and FT-D, the Reporting Entities) and Hans Kobler ("Mr. Kobler"), a member of the Issuer's board of directors (the "Board"). The Reporting Entities and Mr. Kobler are collectively referred to as the Reporting Persons. The agreement among the Reporting Persons to file jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act is attached hereto as Exhibit 1. Each Reporting Person disclaims beneficial ownership of all securities reported in this Statement except to the extent of such Reporting Person's pecuniary interest therein, other than those securities reported herein as being held directly by such Reporting Person.
(b)	The address of the principal offices of each Reporting Entity and the business address of Mr. Kobler is 600 Third Avenue, 38th Floor, New York, NY 10016.
(c)	The principal business of each Reporting Entity is either holding investments in securities of public and private companies or serving as the general partner, managing member or similar entity of related entities engaged in making or recommending investments in securities of public and private companies. The present principal occupation of Mr. Kobler is serving as Chief Executive Officer of Energy Impact Partners LP. Mr. Kobler is the managing member of EIP LLC, which is the general partner of FT-B and FT-D.
(d)	During the past five years, none of the Reporting Persons have been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors).
(e)	None of the Reporting Persons are, nor during the last five years have been, a party to a civil proceeding of a judicial or administrative body of competent jurisdiction and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to such laws.
(f)	Each of EIP LLC, EIF ER Holdings and Flagship is a limited liability company organized under the laws of the State of Delaware. Each of FT-B and FT-D is a limited partnership organized under the laws of the State of Delaware. Mr. Kobler is a dual citizen of the United States of America and Germany.
Item 3.	Source and Amount of Funds or Other Consideration
	Each of FT-B and Flagship were pre-Offering owners of Enchanted Rock Holdings, LLC. FT-B was formed in February 2017 for the principal purpose of indirectly holding equity interests in Enchanted Rock Holdings, LLC and, for a time, other entities. Flagship was formed in April 2025 for the principal purpose of directly holding equity interests in Enchanted Rock Holdings, LLC. On December 27, 2024, pursuant to the 2024 Note Purchase Agreement (as defined in the Prospectus), certain of the Reporting Persons purchased the $10.0 million December 2024 Convertible Note (as defined in the Prospectus). In January and February 2025, pursuant to the 2024 Note Purchase Agreement, certain of the Reporting Persons purchased an aggregate of $10.0 million in Additional 2024 Convertible Notes (as defined in the Prospectus). In April 2025, in connection with the A&R Note Purchase Agreement (as defined in the Prospectus), each of the December 2024 Convertible Note and the Additional 2024 Convertible Notes were amended, and certain of the Reporting Persons purchased an additional $15.3 million in 2025 Convertible Notes (as defined in the Prospectus, together with the December 2024 Convertible Note, the Additional 2024 Convertible Notes, the "Notes"). On May 13, 2026, portions of the Notes were converted into common units and the remaining Notes were redeemed in cash. As a result, the Notes are no longer outstanding as of the date of this Statement. On June 11, 2026, connection with the Offering, EIF ER Blocker LLC merged with and into the Issuer pursuant to the Blocker Mergers (as defined in the Prospectus). As a result of the merger, 20,751,551 Class A Units held by EIF ER Blocker were cancelled, and, as consideration pursuant to the Blocker Mergers, FT-B received 19,350,897 shares of Class A common stock of the Issuer and approximately $27.8 million in cash from the net proceeds from the closing of the Offering. The Issuer also used approximately $119.9 million of the net proceeds from the closing of the Offering to purchase 6,041,206 Class B Units from Flagship. An equal number of shares of the Issuer's Class B common stock were cancelled in connection with the repurchase of the Class B Units. Following the Offering and the repurchases described in this paragraph, each Reporting Person beneficially owned such number of shares of Common Stock set forth in Item 11 of their respective Cover Pages. All shares of the capital stock of the Issuer held by FT-B and Flagship have been purchased using investment funds provided to FT-B and Flagship by their investors. Unless noted above, no part of the purchase price was borrowed by any Reporting Person for the purpose of acquiring any securities discussed in this Item 3.
Item 4.	Purpose of Transaction
	The information set forth in Item 3 of this Statement is incorporated herein by reference. The Reporting Persons hold the securities of the Issuer for general investment purposes. The Reporting Persons may, from time to time, depending on prevailing market, economic and other conditions, acquire additional shares of Class A common stock or other securities of the Issuer, dispose of any such securities, or engage in discussions with the Issuer concerning such acquisitions or dispositions or further investments in the Issuer. The Reporting Persons intend to review their investment in the Issuer on a continuing basis and, depending upon the price and availability of shares of Class A common stock or other securities of the Issuer, subsequent developments affecting the Issuer, the Issuer's business and prospects, other investment and business opportunities available to the Reporting Persons, general stock market and economic conditions, tax considerations and other factors considered relevant, may decide at any time to increase or to decrease the size of their investment in the Issuer in the open market, in privately negotiated transactions, pursuant to 10b5-1 trading plans or otherwise. Except as set forth above, the Reporting Persons have no present plans or intentions which would result in or relate to any of the transactions described in subparagraphs (a) through (j) of Item 4 of Schedule 13D.
Item 5.	Interest in Securities of the Issuer
(a)	See Items 7-11 of the cover pages of this Statement and Item 2 above. Except to the extent of his or its pecuniary interest therein, each Reporting Person disclaims beneficial ownership of such shares of Common Stock, except for the shares, if any, such Reporting Person holds of record.
(b)	See Items 7-11 of the cover pages of this Statement and Item 2 above. Except to the extent of his or its pecuniary interest therein, each Reporting Person disclaims beneficial ownership of such shares of Common Stock, except for the shares, if any, such Reporting Person holds of record.
(c)	Except as reported in this Statement, none of the Reporting Persons has effected any transactions in the Issuer's securities within the past 60 days.
(d)	Under certain circumstances set forth in the limited partnership agreement and limited liability company agreement of FT-B and Flagship, respectively, the general partner and limited partners of FT-B and the members of Flagship may be deemed to have the right to receive dividends from, or the proceeds from, the sale of shares of the Issuer owned by such entity of which they are a partner or member, as applicable.
(e)	Not applicable.
Item 6.	Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer
	The Reporting Persons and certain of the Issuer's other investors entered into the Registration Rights Agreement, dated June 11, 2026 (the "Rights Agreement"). Following the closing of the Offering, the stockholders party thereto are entitled to certain registration rights, including the right to demand that the Issuer file a registration statement or request that their shares be covered by a registration statement that the Issuer is otherwise filing. The terms and provisions of the Rights Agreement are described more fully in the Issuer's Registration Statement on Form S-1 (File No. 333-295965) and declared effective by the Commission on June 9, 2026 (the "Registration Statement"), and the above summary is qualified by reference to such description and the full text of the Rights Agreement, which is filed as Exhibit 2 to this Statement and is incorporated herein by reference. In connection with the Offering, Flagship, FT-B and Mr. Kobler entered into lock-up agreements, substantially in the form attached as Exhibit A to the Underwriting Agreement filed with the Registration Statement. Pursuant to such lock-up agreements, such Reporting Persons have agreed, subject to certain exceptions, not to sell, transfer or otherwise convey any of the Issuer's securities held by each of the Reporting Persons for 180 days following the date of the underwriting agreement for the Offering. The terms and provisions of the lock-up agreements are described more fully in the Registration Statement, and the above summary is qualified by reference to such description and the full text of the lock-up agreement, a form of which is filed as Exhibit 3 to this Statement as attached as Exhibit A to the Underwriting Agreement filed with the Registration Statement and is incorporated herein by reference.
Item 7.	Material to be Filed as Exhibits.
	Exhibit 1: Joint Filing Agreement, dated June 18, 2026, by and among the Reporting Persons (filed herewith). Exhibit 2: Registration Rights Agreement, dated June 11, 2026, by and among the Registrant and certain of its stockholders, (filed as Exhibit 4.2 to the Issuer's Registration Statement on Form S-1/A as filed with the Commission on June 1, 2026 (SEC File No. 333-295965) and incorporated herein by reference). Exhibit 3: Form of Lock-Up Agreement for certain directors, officers and other stockholders of the Issuer (filed as Exhibit 1.1 to the Issuer's Registration Statement on Form S-1/A as filed with the Commission on June 1, 2026 (SEC File No. 333-295965) and incorporated herein by reference).

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Energy Impact Partners LLC

Signature:	/s/ Joshua J. Feldman
Name/Title:	Joshua J. Feldman, Authorized Signatory
Date:	06/18/2026

Energy Impact Fund (FT-B) LP

Signature:	/s/ Joshua J. Feldman
Name/Title:	Joshua J. Feldman, Authorized Signatory
Date:	06/17/2026

EIP Flagship Fund I ER Holdings LLC

Signature:	/s/ Joshua J. Feldman
Name/Title:	Joshua J. Feldman, Authorized Signatory
Date:	06/18/2026

EIF ER Holdings LLC

Signature:	/s/ Joshua J. Feldman
Name/Title:	Joshua J. Feldman, Authorized Signatory
Date:	06/18/2026

Energy Impact Fund (FT-D) LP

Signature:	/s/ Joshua J. Feldman
Name/Title:	Joshua J. Feldman, Authorized Signatory
Date:	06/18/2026

Hans Kobler

Signature:	/s/ Joshua J. Feldman
Name/Title:	Joshua J. Feldman, as attorney in fact for Hans Kobler
Date:	06/18/2026

FAQ

How much of ERock (EROC) does Energy Impact Partners beneficially own?

Energy Impact Partners LLC and affiliated funds, together with Hans Kobler, report beneficial ownership of 102,813,846 shares on an as-converted basis, representing 78.1% of ERock’s Class A common stock, based on 48,174,023 Class A shares outstanding as of June 11, 2026.

What are the main shareholdings disclosed in ERock (EROC) Schedule 13D?

The Schedule 13D shows FT-B holding 19,350,897 Class A shares and Flagship-related entities holding 83,355,210 Class B shares and Class B Units plus 107,739 Class A shares underlying vested Class M Units, all contributing to the reported 78.1% beneficial ownership.

How did Energy Impact Partners build its position in ERock (EROC)?

Energy Impact Partners-affiliated entities invested through Enchanted Rock Holdings, LLC, purchasing a $10.0 million December 2024 Convertible Note, $10.0 million in additional 2024 notes, and $15.3 million in 2025 convertible notes, later converted or redeemed before ERock’s June 2026 offering.

What cash transactions involving ERock (EROC) are described in the Schedule 13D?

In connection with the June 2026 offering and blocker mergers, FT-B received approximately $27.8 million in cash, while ERock used about $119.9 million of net offering proceeds to purchase 6,041,206 Class B Units from Flagship, cancelling an equal number of Class B shares.

What registration rights do ERock (EROC) investors receive under this disclosure?

The statement notes a Registration Rights Agreement dated June 11, 2026, giving participating stockholders rights to demand that ERock file a registration statement or to include their shares in registration statements ERock otherwise files, enhancing potential future liquidity for those holders.

Are ERock (EROC) shares held by Flagship and FT-B subject to lock-up restrictions?

Yes. In connection with the offering, Flagship, FT-B and Hans Kobler entered lock-up agreements, generally prohibiting sales, transfers or other dispositions of their ERock securities for 180 days following the underwriting agreement date, subject to specified exceptions.