Sec Form 4 Filing - GROSS WILLIAM @ Heliogen, Inc. - 2024-02-15

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person GROSS WILLIAM 2. Issuer Name and Ticker or Trading Symbol Heliogen, Inc. [ HLGN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O IDEALAB, 130 WEST UNION STREET 3. Date of Earliest Transaction (MM/DD/YY) 02/15/2024 (Street) PASADENA, CA91103 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/15/2024 S 442,298 D $ 1.5195 0 ( 1 ) D Common Stock 142,313 I See footnote ( 2 ) Common Stock 462 I See footnote ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other GROSS WILLIAM C/O IDEALAB 130 WEST UNION STREET PASADENA, CA91103 X Signatures /s/ William Gross 02/19/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Non-market, private transaction pursuant to a stock transfer between Idealab Holdings, LLC ("Idealab Holdings") and an affiliate of an existing holder of the Issuer's common stock. Price represents agreed value per share of non-cash consideration received in transfer. Idealab Holdings, which is a wholly owned subsidiary of Idealab, a California corporation ("Idealab"). Idealab is managed by a board of directors (the "Idealab Board") including Mr. Gross. Mr. Gross may be deemed to have beneficially own these shares. Mr. Gross disclaimed beneficial ownership of these shares except to the extent of his pecuniary interest therein. Stock transferred on 2/20/2024. ( 2 )These shares are held by The Gross Goodstein Living Trust (the "Trust") of which Mr. Gross is a co-trustee. Mr. Gross may be deemed to beneficially own these shares. Mr. Gross disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. ( 3 )These shares are held by Idealab Studio, LLC ("Idealab Studio"), for which Mr. Gross serves as chairman and chief executive officer. The Trust owns a majority of the class of securities of Idealab Studio entitled to elect two managers to Idealab Studio's board of managers. Mr. Gross may be deemed to beneficially own these shares. Mr. Gross disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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