York Space Systems insider awarded 430,134 shares

York Space Systems Inc. reported that AE Industrial HorizonX Venture Fund II, LP received an award of 430,134 shares of common stock at $34.00 per share.

Rhea-AI Filing Summary

York Space Systems Inc. reported that AE Industrial HorizonX Venture Fund II, LP received an award of 430,134 shares of common stock at $34.00 per share. The grant was issued under an Agreement and Plan of Reorganization involving Solestial, Inc. and other parties.

Following this indirect acquisition, entities associated with AE Industrial Partners collectively hold 30,626,222 shares of York Space Systems common stock. These entities are ultimately controlled by AeroEquity GP, LLC, whose managing members Michael Greene and David Rowe make all voting and investment decisions, while all parties disclaim beneficial ownership beyond their pecuniary interests.

Insider Trade Summary

Grant/Award: 430,134 shares

Grant/Award 1 txn

Insider AEROEQUITY GP, LLC, GREENE MICHAEL ROBERT, ROWE DAVID H.

Role 10% Owner | 10% Owner | 10% Owner

Type	Security	Shares	Price	Value
Grant/Award	Common Stock, par value $0.0001 per share	430,134	$34.00	$14.62M

Holdings After Transaction: Common Stock, par value $0.0001 per share — 30,626,222 shares (Indirect, See Footnotes)

Footnotes (3)

1. F1. Consists of 430,134 shares of common stock issued to AE Industrial HorizonX Venture Fund II, LP, pursuant to that certain Agreement and Plan of Reorganization (the "Merger Agreement"), dated as of May 15, 2026, by and among York Space Systems Inc. (the "Company"), Solestial, Inc. and the other parties thereto.
2. F2. Consists of 2,832,488 shares held by AE Industrial Partners Fund II, LP, 1,813,066 shares held by AE Industrial Partners Fund II-A, LP, 6,842 shares held by AE Industrial Partners Fund II-B, LP, 10,908,489 shares held by AE Industrial Partners Fund III, LP, 3,258,380 shares held by AE Industrial Partners Fund III-A, LP, 566,675 shares held by AE Aerospace Opportunities Fund, 8,757,636 shares held by AE Co-Investment Partners Fund III-Y, LP (CIV), 1,475,343 shares held by AE Co-Investment Partners Fund III Y-2, LP, 23,916 shares held by AE Industrial PSO Equity Partners, LP, 553,253 shares held by AE Industrial Partners PBCI Aggregator, LP and 430,134 shares held by AE Industrial HorizonX Venture Fund II, LP.
3. F3. Each entity described above is ultimately controlled by AeroEquity GP, LLC. AeroEquity GP, LLC is controlled by its managing members, Michael Greene and David Rowe. Messrs. Greene and Rowe make all voting and investment decisions with respect to the securities held by AE Industrial Partners. Each of the entities and individuals named above disclaims beneficial ownership of the securities held by AE Industrial Partners, except to the extent of its pecuniary interest therein.

Key Figures

Shares acquired: 430,134 shares Grant price: $34.00 per share Post-transaction holdings: 30,626,222 shares +2 more

5 metrics

Shares acquired 430,134 shares Common stock grant at $34.00 per share on 2026-06-04

Grant price $34.00 per share Price for common stock issued to AE Industrial HorizonX Venture Fund II, LP

Post-transaction holdings 30,626,222 shares Total York Space Systems shares held by AE Industrial-related entities after the award

Transaction code A (grant, award, or other acquisition) Non-derivative common stock transaction classification

Ten percent owners 3 reporting persons AeroEquity GP, LLC, Michael Greene, and David Rowe listed as 10% owners

Key Terms

Agreement and Plan of Reorganization, beneficial ownership, pecuniary interest, indirect ownership, +1 more

5 terms

Agreement and Plan of Reorganization financial

"issued to AE Industrial HorizonX Venture Fund II, LP, pursuant to that certain Agreement and Plan of Reorganization"

An agreement and plan of reorganization is a formal roadmap negotiated between a financially distressed company and its creditors that explains how debts, assets and ownership will be restructured so the business can continue operating. For investors it’s the document that determines who gets paid, what claims are reduced or converted into new shares, and how much existing equity may be wiped out or diluted — like a household rearranging bills and mortgages to stay solvent while deciding who gets repaid and how.

beneficial ownership financial

"disclaims beneficial ownership of the securities held by AE Industrial Partners, except to the extent of its pecuniary interest"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

pecuniary interest financial

"disclaims beneficial ownership of the securities held by AE Industrial Partners, except to the extent of its pecuniary interest therein"

indirect ownership financial

"total_shares_following_transaction 30,626,222.0000, ownership_type indirect, ownership_code I"

ten percent owner financial

"each reporting person is indicated as a ten percent owner of York Space Systems Inc."

FAQ

What insider transaction did York Space Systems (YSS) report on this Form 4/A?

York Space Systems reported an indirect acquisition of 430,134 common shares by AE Industrial HorizonX Venture Fund II, LP at $34.00 per share. The shares were issued pursuant to an Agreement and Plan of Reorganization involving Solestial, Inc. and related parties.

Who controls the AE Industrial entities involved in the York Space Systems (YSS) share holdings?

All AE Industrial entities holding York Space Systems shares are ultimately controlled by AeroEquity GP, LLC. AeroEquity GP, LLC is controlled by managing members Michael Greene and David Rowe, who make all voting and investment decisions for AE Industrial Partners’ securities.

How many York Space Systems (YSS) shares are held by AE Industrial-related entities after this transaction?

After the reported award, AE Industrial-related entities collectively hold 30,626,222 York Space Systems common shares. This total includes the newly issued 430,134 shares to AE Industrial HorizonX Venture Fund II, LP and existing holdings across multiple AE Industrial funds.

What is the nature of the 430,134-share acquisition reported for York Space Systems (YSS)?

The 430,134-share acquisition is classified as a grant, award, or other acquisition of common stock at $34.00 per share. It was issued to AE Industrial HorizonX Venture Fund II, LP under a merger-related Agreement and Plan of Reorganization with Solestial, Inc.

Do the AE Industrial entities and managers claim full beneficial ownership of York Space Systems (YSS) shares?

The entities and individuals associated with AE Industrial Partners disclaim beneficial ownership of York Space Systems shares, except to the extent of their pecuniary interest. This means they recognize economic exposure but limit ownership claims beyond their financial stake in the securities.

How are Michael Greene and David Rowe related to York Space Systems (YSS) share holdings?

Michael Greene and David Rowe are managing members of AeroEquity GP, LLC, which ultimately controls the AE Industrial entities holding York Space Systems shares. They make all voting and investment decisions for those securities but disclaim beneficial ownership beyond pecuniary interests.

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Accepted by SEC EDGAR 06/29/2026 - 04:05 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

AEROEQUITY GP, LLC

(Last) (First) (Middle)

C/O AE INDUSTRIAL PARTNERS, LP

6700 BROKEN SOUND PKWY NW

(Street)

BOCA RATON FLORIDA 33487

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
York Space Systems Inc. [ YSS ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/04/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)
06/05/2026

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
Common Stock, par value $0.0001 per share	06/04/2026		A(1)		430,134	A	$34	30,626,222(2)	I	See Footnotes(2)(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 (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 Securities Underlying Derivative Security (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: 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

1. Name and Address of Reporting Person^*

AEROEQUITY GP, LLC

(Last) (First) (Middle)

C/O AE INDUSTRIAL PARTNERS, LP

6700 BROKEN SOUND PKWY NW

(Street)

BOCA RATON FLORIDA 33487

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

GREENE MICHAEL ROBERT

(Last) (First) (Middle)

C/O AE INDUSTRIAL PARTNERS, LP

6700 BROKEN SOUND PKWY NW

(Street)

BOCA RATON FLORIDA 33487

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

1. Name and Address of Reporting Person^*

ROWE DAVID H.

(Last) (First) (Middle)

C/O AE INDUSTRIAL PARTNERS, LP

6700 BROKEN SOUND PKWY NW

(Street)

BOCA RATON FLORIDA 33487

(City) (State) (Zip)

UNITED STATES

(Country)

Relationship of Reporting Person(s) to Issuer

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

Explanation of Responses:

1. Consists of 430,134 shares of common stock issued to AE Industrial HorizonX Venture Fund II, LP, pursuant to that certain Agreement and Plan of Reorganization (the "Merger Agreement"), dated as of May 15, 2026, by and among York Space Systems Inc. (the "Company"), Solestial, Inc. and the other parties thereto.

2. Consists of 2,832,488 shares held by AE Industrial Partners Fund II, LP, 1,813,066 shares held by AE Industrial Partners Fund II-A, LP, 6,842 shares held by AE Industrial Partners Fund II-B, LP, 10,908,489 shares held by AE Industrial Partners Fund III, LP, 3,258,380 shares held by AE Industrial Partners Fund III-A, LP, 566,675 shares held by AE Aerospace Opportunities Fund, 8,757,636 shares held by AE Co-Investment Partners Fund III-Y, LP (CIV), 1,475,343 shares held by AE Co-Investment Partners Fund III Y-2, LP, 23,916 shares held by AE Industrial PSO Equity Partners, LP, 553,253 shares held by AE Industrial Partners PBCI Aggregator, LP and 430,134 shares held by AE Industrial HorizonX Venture Fund II, LP.

3. Each entity described above is ultimately controlled by AeroEquity GP, LLC. AeroEquity GP, LLC is controlled by its managing members, Michael Greene and David Rowe. Messrs. Greene and Rowe make all voting and investment decisions with respect to the securities held by AE Industrial Partners. Each of the entities and individuals named above disclaims beneficial ownership of the securities held by AE Industrial Partners, except to the extent of its pecuniary interest therein.

Remarks:

Exhibit 24.1 - Power of Attorney. This amendment to the Reporting Person's Form 4 filed on June 5, 2026 is being filed solely to update the number of shares of common stock issued to the Reporting Person pursuant to the Merger Agreement.

	/s/ Matt Friendly, by Power of Attorney	06/29/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)