SEC FORM 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person ^*

ARCH Venture Fund X, L.P.

(Last)

(First)

(Middle)

8755 W. HIGGINS ROAD, SUITE 1025

(Street)

CHICAGO

60631

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
10/29/2026

3. Issuer Name and Ticker or Trading Symbol
Aspen Neuroscience, Inc. [ ASPE ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

5. If Amendment, Date of 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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Series Seed Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	187,182	⁽¹⁾	D ⁽²⁾ ⁽⁴⁾
Series A-1 Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	298,258	⁽¹⁾	D ⁽²⁾ ⁽⁴⁾
Series A-1 Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	298,258	⁽¹⁾	D ⁽³⁾ ⁽⁴⁾
Series A-2 Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	286,304	⁽¹⁾	D ⁽²⁾ ⁽⁴⁾
Series A-2 Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	286,304	⁽¹⁾	D ⁽³⁾ ⁽⁴⁾
Series B Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	295,490	⁽¹⁾	D ⁽²⁾ ⁽⁴⁾
Series B Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	295,490	⁽¹⁾	D ⁽³⁾ ⁽⁴⁾
Series C Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	259,948	⁽¹⁾	D ⁽²⁾ ⁽⁴⁾
Series C Convertible Preferred Stock	⁽¹⁾	⁽¹⁾	Common Stock	214,355	⁽¹⁾	D ⁽³⁾ ⁽⁴⁾

Explanation of Responses:

1. Pursuant to the Issuer's Amended and Restated Certificate of Incorporation, as amended, each share of Series Seed Convertible Preferred Stock, Series A-1 Convertible Preferred Stock, Series A-2 Convertible Preferred Stock, Series B Convertible Preferred Stock, and Series C Convertible Preferred Stock (collectively, the "Preferred Stock") may be converted, at the option of the holder, at any time. In connection with the completion of the Issuer's initial public offering of its Common Stock, each share of Preferred Stock will automatically convert on a 1-for-9.8821 basis into shares of Common Stock, for no additional consideration. Share numbers give effect to such conversion. The securities have no expiration date.

2. Securities held by ARCH Venture Fund X, L.P. ("ARCH X"). ARCH Venture Partners X, L.P. ("AVP X LP") is the sole general partner of ARCH X.

3. Securities held by ARCH Venture Fund X Overage, L.P. ("ARCH X Overage"). ARCH Venture Partners X Overage, L.P. ("AVP X Overage LP") is the sole general partner of ARCH X Overage.

4. ARCH Venture Partners X, LLC ("AVP X LLC") is the sole general partner of each of AVP X LP and AVP X Overage LP. Keith Crandell, Kristina Burow, Steven Gillis, and Robert Nelsen (collectively, the "AVP X Committee Members") comprise the investment committee of AVP X LLC. AVP X LP and AVP X Overage LP may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, respectively, AVP X LLC may be deemed to beneficially own the shares held by ARCH X and ARCH X Overage, and each of the AVP X Committee Members may be deemed to share the power to direct the disposition and vote of the shares held by ARCH X and ARCH X Overage. Each of AVP X LP, AVP X Overage LP, AVP X LLC, and the AVP X Committee Members disclaims beneficial ownership except to the extent of any pecuniary interest therein.

	ARCH Venture Fund X, L.P. By: ARCH Venture Partners X, L.P., its General Partner By: ARCH Venture Partners X, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact	10/29/2026
	** Signature of Reporting Person	Date
	ARCH Venture Fund X Overage, L.P. By: ARCH Venture Partners X Overage, L.P., its General Partner By: ARCH Venture Partners X, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact	10/29/2026
	** Signature of Reporting Person	Date
	ARCH Venture Partners X, L.P. By: ARCH Venture Partners X, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact	10/29/2026
	** Signature of Reporting Person	Date
	ARCH Venture Partners X Overage, L.P. By: ARCH Venture Partners X, LLC, its General Partner By: /s/ Mark McDonnell, as Attorney-in-Fact	10/29/2026
	** Signature of Reporting Person	Date
	ARCH Venture Partners X, LLC By: /s/ Mark McDonnell, as Attorney-in-Fact	10/29/2026
	** Signature of Reporting Person	Date
	/s/ Robert Nelsen, By: Mark McDonnell, attorney-in-fact	10/29/2026
	** Signature of Reporting Person	Date
	/s/ Keith Crandell, By: Mark McDonnell, attorney-in-fact	10/29/2026
	** Signature of Reporting Person	Date
	/s/ Kristina Burow, By: Mark McDonnell, attorney-in-fact	10/29/2026
	** Signature of Reporting Person	Date
	/s/ Steven Gillis, By: Mark McDonnell, attorney-in-fact	10/29/2026
	** Signature of Reporting Person	Date
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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