AEROEQUITY GP, LLC - 29 Jan 2026 Form 3 Insider Report for Yellowstone Midco Holdings II, LLC (YSS)

Role: 10%+ Owner
Signature: AeroEquity GP, LLC /s/ Michael Greene, Authorized Signatory
Issuer symbol: YSS
Transactions as of: 29 Jan 2026
Net transactions value: $0
Form type: 3
Filing time: 29 Jan 2026, 21:49:08 UTC
Previous filing: 08 Aug 2025
SEC: View on sec.gov

Reporting Owners (3)

Name	Relationship	Address	Signature	Signature date	CIK
AEROEQUITY GP, LLC	10%+ Owner	C/O AE INDUSTRIAL PARTNERS, LP, 6700 BROKEN SOUND PKWY NW, BOCA RATON	AeroEquity GP, LLC /s/ Michael Greene, Authorized Signatory	29 Jan 2026	0001880792
GREENE MICHAEL ROBERT	10%+ Owner	C/O AE INDUSTRIAL PARTNERS, LP, 6700 BROKEN SOUND PKWY NW, BOCA RATON	/s/ Michael Greene	29 Jan 2026	0001881294
ROWE DAVID H.	10%+ Owner	C/O AE INDUSTRIAL PARTNERS, LP, 6700 BROKEN SOUND PKWY NW, BOCA RATON	/s/ David H. Rowe	29 Jan 2026	0001880788

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	YSS	Common Stock						30,196,088	29 Jan 2026	See Footnotes	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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 and 553,253 shares held by AE Industrial Partners PBCI Aggregator, LP.
F2	Each entity described in footnote (1) 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.

Content

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 and 553,253 shares held by AE Industrial Partners PBCI Aggregator, LP.

Each entity described in footnote (1) 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