Alyeska’s 7.14% ESS Tech (GWH) stake revealed in Schedule 13G

Rhea-AI Filing Summary

ESS Tech, Inc. disclosed that funds associated with Alyeska Investment Group, L.P., Alyeska Fund GP, LLC and Anand Parekh beneficially own 1,400,000 shares of its common stock. This represents 7.14% of the company’s outstanding common shares as of a recent prospectus.

The filing shows Alyeska and Parekh share both voting and dispositive power over all 1,400,000 shares, with no sole voting or dispositive authority. The investors certify the stake is held in the ordinary course of business and not for the purpose of changing or influencing control of ESS Tech.

Insights

Equity ownership and governance analyst

Alyeska reports a passive 7.14% stake in ESS Tech.

The disclosure shows Alyeska Investment Group, its general partner Alyeska Fund GP, LLC, and Anand Parekh jointly beneficially owning 1,400,000 common shares of ESS Tech, equal to 7.14% of outstanding stock based on 19,617,070 shares reported in a recent prospectus.

The group has shared voting and dispositive power over the full position and no sole authority, indicating coordinated control over how the shares are voted and transacted. They certify the holdings are in the ordinary course of business and not intended to change or influence control, framing this as a passive institutional stake rather than an activist position.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

ESS Tech, Inc.

(Name of Issuer)

Common Stock, $0.0001 par value per share

(Title of Class of Securities)

26916J205

(CUSIP Number)

12/31/2025

(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)

SCHEDULE 13G

CUSIP No. 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)

7.14 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP No. 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)

7.14 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP No. 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)

7.14 %

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: 7.14%
(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.
	Not Applicable
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:	02/17/2026

Alyeska Fund GP, LLC

Signature:	Jason Bragg
Name/Title:	Jason Bragg | Chief Financial Officer
Date:	02/17/2026

Anand Parekh

Signature:	Anand Parekh
Name/Title:	Anand Parekh | Self
Date:	02/17/2026

Exhibit Information

The reporting persons are the beneficial owners of 1,400,000 common shares of the Issuer. The percentage of beneficial ownership is based on 19,617,070 shares of the registrant's common stock outstanding as reported on the Issuer's Prospectus filed with the Securities and Exchange Commission on December 11, 2025. 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.

FAQ

What percentage of ESS Tech (GWH) does Alyeska beneficially own?

Alyeska-related reporting persons beneficially own 7.14% of ESS Tech’s common stock. This corresponds to 1,400,000 shares, calculated against 19,617,070 outstanding shares of common stock reported in ESS Tech’s prospectus dated December 11, 2025.

How many ESS Tech (GWH) shares are reported in Alyeska’s Schedule 13G?

The Schedule 13G reports 1,400,000 shares of ESS Tech common stock beneficially owned by the reporting persons. These shares represent a significant institutional position and equate to 7.14% of the company’s outstanding common stock based on a recent prospectus figure.

Who are the reporting persons in the ESS Tech (GWH) Schedule 13G filing?

The reporting persons are Alyeska Investment Group, L.P., Alyeska Fund GP, LLC, and Anand Parekh. They jointly report beneficial ownership and shared voting and dispositive power over 1,400,000 ESS Tech common shares under the Schedule 13G filing.

Does Alyeska have sole or shared voting power over ESS Tech (GWH) shares?

The filing shows shared voting power over all 1,400,000 shares and no sole voting power. Similarly, the reporting persons have shared dispositive power over the entire position, indicating decisions are made jointly rather than by any single reporting entity alone.

Is Alyeska’s ESS Tech (GWH) stake described as passive or activist?

The investors certify the shares were acquired and are held in the ordinary course of business and not to change or influence control. This language characterizes the 7.14% ESS Tech stake as a passive institutional investment rather than an activist position.

What share count did ESS Tech (GWH) use to calculate Alyeska’s 7.14% ownership?

The 7.14% ownership figure is based on 19,617,070 shares of ESS Tech common stock outstanding. This outstanding share count comes from the company’s prospectus filed with the SEC on December 11, 2025, as referenced in the filing.