York Space Systems (YSS) issues 287,789 shares to AE Industrial fund in merger deal

Rhea-AI Filing Summary

York Space Systems Inc. reported an insider Form 4 showing an indirect acquisition of common stock tied to a merger. AE Industrial HorizonX Venture Fund II, LP received 287,789 shares of York common stock at $34.00 per share under an Agreement and Plan of Reorganization among York Space Systems, Solestial, Inc. and related parties dated May 15, 2026. After this issuance, entities managed by AE Industrial Partners collectively held 30,483,877 York shares. These holdings are ultimately controlled by AeroEquity GP, LLC, whose managing members Michael Greene and David Rowe make voting and investment decisions, while all parties disclaim beneficial ownership beyond their pecuniary interests.

Insider Trade Summary

Net Buyer: 287,789 shares

Net Buy 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	287,789	$34.00	$9.78M

Holdings After Transaction: Common Stock, par value $0.0001 per share — 30,483,877 shares (Indirect, See Footnotes)

Footnotes (3)

1. F1. Consists of 287,789 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 287,789 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 issued to AE Industrial HorizonX Venture Fund II, LP: 287,789 shares Implied share value for issuance: $34.00 per share Total York shares held by AE Industrial-related entities: 30,483,877 shares +3 more

6 metrics

Shares issued to AE Industrial HorizonX Venture Fund II, LP 287,789 shares Merger consideration under Agreement and Plan of Reorganization

Implied share value for issuance $34.00 per share Common stock issued as part of merger consideration

Total York shares held by AE Industrial-related entities 30,483,877 shares Indirect holdings following the reported transaction

Shares held by AE Industrial Partners Fund II, LP 2,832,488 shares Part of AE Industrial’s aggregate York holdings

Shares held by AE Industrial Partners Fund III, LP 10,908,489 shares Largest single AE Industrial fund position in York

Shares held by AE Co-Investment Partners Fund III-Y, LP (CIV) 8,757,636 shares Co-investment vehicle within AE Industrial complex

Key Terms

Agreement and Plan of Reorganization, beneficial ownership, pecuniary interest, ten percent owner, +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"

ten percent owner financial

"reporting persons are listed as ten percent owners of York Space Systems Inc."

indirect ownership financial

"total_shares_following_transaction shows indirect ownership with nature of ownership described in the footnotes"

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Form 4 Insider Transactions: What Each Field Means →

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

FAQ

What insider transaction did York Space Systems (YSS) report in this Form 4?

York Space Systems reported an indirect acquisition of 287,789 common shares. These shares were issued to AE Industrial HorizonX Venture Fund II, LP at $34.00 per share as part of a merger-related Agreement and Plan of Reorganization involving Solestial, Inc. and other parties.

Who received the 287,789 York Space Systems (YSS) shares disclosed in the Form 4?

The 287,789 York Space Systems shares were issued to AE Industrial HorizonX Venture Fund II, LP. This fund is part of a broader AE Industrial Partners structure ultimately controlled by AeroEquity GP, LLC and its managing members Michael Greene and David Rowe.

What is the connection between the York Space Systems (YSS) Form 4 and the Solestial, Inc. merger?

The Form 4 reflects shares issued under an Agreement and Plan of Reorganization involving York Space Systems and Solestial, Inc. As consideration in that merger, AE Industrial HorizonX Venture Fund II, LP received 287,789 York common shares at $34.00 per share.

How many York Space Systems (YSS) shares do AE Industrial-related entities hold after this transaction?

After the transaction, AE Industrial-related entities collectively hold 30,483,877 York Space Systems shares. These holdings are spread across multiple AE Industrial funds but are ultimately controlled by AeroEquity GP, LLC, subject to each party’s pecuniary interest.

Who are the reporting persons on the York Space Systems (YSS) Form 4?

The reporting persons are AeroEquity GP, LLC, Michael Robert Greene, and David H. Rowe. They are listed as ten percent owners and ultimately control AE Industrial entities holding York shares, while disclaiming beneficial ownership beyond their pecuniary interests.

Is the York Space Systems (YSS) Form 4 transaction a market purchase or a grant?

The transaction is classified as a grant or award acquisition, not an open-market purchase. The 287,789 shares were issued as merger consideration at a stated value of $34.00 per share under the Agreement and Plan of Reorganization.

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)

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)		287,789	A	$34	30,483,877(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 287,789 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 287,789 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

	/s/ Matt Friendly, by Power of Attorney	06/05/2026
	** 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)