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 OF SECURITIES

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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(Print or Type Responses)
1. Name and Address of Reporting Person *
Wood River Capital, LLC
  2. Issuer Name and Ticker or Trading Symbol
ASPEN AEROGELS INC [ASPN] 		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)
4111 E. 37TH STREET NORTH		 3. Date of Earliest Transaction (Month/Day/Year)
08/19/2024
(Street)

WICHITA, KS 67220		 4. If Amendment, Date Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
___ Form filed by One Reporting Person
_X_ 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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

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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year) 		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
Convertible Senior PIK Toggle Notes due 2027 (1) $ 29.9366 (2) 08/19/2024   S     123,937,608 (3)   (4) 02/18/2027(4) Common Stock 4,139,999 (5) $ 150,028,886 0 D (6)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Wood River Capital, LLC
4111 E. 37TH STREET NORTH
WICHITA, KS 67220		     X    
Koch, Inc.
4111 E. 37TH STREET NORTH
WICHITA, KS 67220		     X    

Signatures

 Wood River Capital, LLC /s/ Raffaele G. Fazio, Vice President and Secretary   08/19/2024
**Signature of Reporting Person Date

 Koch, Inc. /s/ Raffaele G. Fazio, Assistant Secretary   08/19/2024
**Signature of Reporting Person Date

Explanation of Responses:

* 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).
(1) On August 19, 2024, Wood River Capital, LLC ("Wood River") and Aspen Aerogels, Inc. (the "Issuer") entered into a Note Purchase and Sale Agreement (the "NPA") pursuant to which the Issuer agreed to repurchase all of its outstanding Convertible Senior PIK Toggle Notes due 2027 (the "Notes") from Wood River. The repurchase closed on August 19, 2024.
(2) Represents the effective conversion price of $29.936625 per share of the common stock of Issuer, as reported in the Issuer's Current Report on Form 8-K, filed on November 29, 2022.
(3) Represents the aggregate capitalized principal amount of the Notes, including paid-in-kind interest, capitalized through, but not including, the interest payment date of June 30, 2024.
(4) Prior to their repurchase by the Issuer, the Notes were convertible at any time and matured on February 18, 2027.
(5) Represents 4,139,999 shares of the Issuer's common stock issuable upon conversion of the Aggregate Principal Amount based on the effective conversion price of $29.936625 per share.
(6) Wood River is beneficially owned by SCC Holdings, LLC ("SCC"), SCC is beneficially owned by KIM, LLC ("KIM"), KIM is beneficially owned by Koch Investments Group, LLC ("KIG"), KIG is beneficially owned by Koch Investments Group Holdings, LLC ("KIGH"), KIGH is beneficially owned by Koch Companies, LLC ("KCLLC"), and KCLLC is beneficially owned by Koch, Inc., in each case by means of ownership of all voting equity instruments. Koch, Inc., KCLLC, KIGH, KIG, KIM and SCC may be deemed to beneficially own the securities beneficially owned by Wood River by virtue of (i) Koch, Inc.'s beneficial ownership of KCLLC, (ii) KCLLC's beneficial ownership of KIGH, (iii) KIGH's beneficial ownership of KIG, (iv) KIG's beneficial ownership of KIM, (v) KIM's beneficial ownership of SCC, and (vi) SCC's beneficial ownership of Wood River.

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