ESS Tech stake update: Alyeska reports 4.76% holding

ESS Tech, Inc. received an amended Schedule 13G filing (Amendment No. 2) reporting that Alyeska Investment Group, L.P., Alyeska Fund GP, LLC, and Anand Parekh collectively beneficially own 1,400,000 shares of ESS Tech common stock.

Rhea-AI Filing Summary

ESS Tech, Inc. received an amended Schedule 13G filing (Amendment No. 2) reporting that Alyeska Investment Group, L.P., Alyeska Fund GP, LLC, and Anand Parekh collectively beneficially own 1,400,000 shares of ESS Tech common stock. This represents 4.76% of the outstanding common shares. The reporting persons have shared voting and shared dispositive power over all 1,400,000 shares and no sole voting or dispositive power. The filing also indicates that the group now holds 5 percent or less of the class.

Key Figures

Shares beneficially owned: 1,400,000 shares Percent of class: 4.76% Shared voting power: 1,400,000 shares +2 more

5 metrics

Shares beneficially owned 1,400,000 shares Common stock beneficially owned by Alyeska group

Percent of class 4.76% Percentage of ESS Tech common stock class

Shared voting power 1,400,000 shares Shares over which the group has shared voting power

Sole voting power 0 shares Shares over which the group has sole voting power

Shared dispositive power 1,400,000 shares Shares over which the group has shared dispositive power

Key Terms

beneficially owned, shared voting power, shared dispositive power, Ownership of 5 percent or less of a class, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 1,400,000"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"Shared Voting Power 1,400,000.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"Shared Dispositive Power 1,400,000.00"

Ownership of 5 percent or less of a class regulatory

"Item 5. | Ownership of 5 Percent or Less of a Class."

Schedule 13G regulatory

"JOINT FILING STATEMENT PURSUANT TO RULE 13d-1(k)"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What ownership stake in ESS Tech (GWH) does Alyeska report in this Schedule 13G/A?

Alyeska and related reporting persons report beneficial ownership of 1,400,000 ESS Tech shares, representing 4.76% of the common stock. All of these shares are held with shared voting and shared dispositive power and no sole authority.

Who are the reporting persons in the ESS Tech (GWH) Schedule 13G/A Amendment No. 2?

The reporting persons are Alyeska Investment Group, L.P., Alyeska Fund GP, LLC, and Anand Parekh. They jointly report beneficial ownership of 1,400,000 ESS Tech common shares with shared voting and dispositive power under a joint filing agreement.

What level of voting power over ESS Tech (GWH) shares does Alyeska report?

The group reports 0 shares with sole voting power and 1,400,000 shares with shared voting power. They likewise report shared dispositive power over 1,400,000 shares and no sole dispositive authority over any ESS Tech common stock.

Does this ESS Tech (GWH) Schedule 13G/A indicate ownership above or below 5%?

The filing shows 4.76% of the class beneficially owned, and expressly notes ownership of 5 percent or less of ESS Tech’s common stock. This places the reporting group below the 5% beneficial ownership threshold.

What class of ESS Tech (GWH) securities is covered by this Schedule 13G/A?

The disclosure covers Common Stock, $0.0001 par value per share of ESS Tech, Inc. The filing’s reported beneficial ownership and percentage refer specifically to this class of common stock identified by CUSIP 26916J205.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 04:39 PM Accepted by SEC EDGAR 08/14/2026 - 04:35 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 2)

ESS Tech, Inc.

(Name of Issuer)

Common Stock, $0.0001 par value per share

(Title of Class of Securities)

26916J205

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 26916J205

1

Names of Reporting Persons

Alyeska Investment Group, L.P.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,400,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.76 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): 26916J205

1

Names of Reporting Persons

Alyeska Fund GP, LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,400,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.76 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): 26916J205

1

Names of Reporting Persons

Anand Parekh

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,400,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,400,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,400,000.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.76 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ESS Tech, Inc.
(b)	Address of issuer's principal executive offices: 26440 SW PARKWAY AVE., BLDG. 83, WILSONVILLE, OR, 97070
Item 2.
(a)	Name of person filing: (i) Alyeska Investment Group, L.P. (ii) Alyeska Fund GP, LLC (iii) Anand Parekh
(b)	Address or principal business office or, if none, residence: (i) 77 West Wacker Drive, 7th Floor, Chicago, IL 60601 (ii) 77 West Wacker Drive, 7th Floor, Chicago, IL 60601 (iii) 77 West Wacker Drive, 7th Floor, Chicago, IL 60601
(c)	Citizenship: (i) Alyeska Investment Group, L.P. - Delaware (ii) Alyeska Fund GP, LLC - Delaware (iii) Anand Parekh - United States of America
(d)	Title of class of securities: Common Stock, $0.0001 par value per share
(e)	CUSIP No.: 26916J205
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 1,400,000
(b)	Percent of class: 4.76%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 1,400,000
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 1,400,000
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Alyeska Investment Group, L.P.

Signature:	Jason Bragg
Name/Title:	Jason Bragg | Chief Financial Officer
Date:	08/14/2026

Alyeska Fund GP, LLC

Signature:	Jason Bragg
Name/Title:	Jason Bragg | Chief Financial Officer
Date:	08/14/2026

Anand Parekh

Signature:	Anand Parekh
Name/Title:	Anand Parekh | Self
Date:	08/14/2026

Exhibit Information

JOINT FILING STATEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on SCHEDULE 13G, is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on SCHEDULE 13G, shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.