Director at Yellowstone Midco (YSS) receives 5,294 restricted stock units

Rhea-AI Filing Summary

Yellowstone Midco Holdings II, LLC director Louis R. Brothers Jr reported an equity grant of 5,294 shares of common stock on January 30, 2026. The filing shows these were awarded at a price of $0 per share, indicating a stock-based compensation grant rather than a market purchase.

The award consists of restricted stock units that vest on the first anniversary of the grant date5,294 common shares, all held directly.

02/03/2026 - 08:56 PM

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

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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^*

Brothers Louis R Jr

(Last) (First) (Middle)

C/O YORK SPACE SYSTEMS INC.

6060 S WILLOW DRIVE

(Street)

GREENWOOD VILLAGE CO 80111

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Yellowstone Midco Holdings II, LLC [ YSS ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
01/30/2026

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

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

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

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	01/30/2026		A		5,294(1)	A	$0	5,294	D

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

Explanation of Responses:

1. Represents restricted stock units which vest on the first anniversary of the grant date.

	/s/ Monica Palko, by Power of Attorney	02/03/2026
	** 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.
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FAQ

What insider transaction did Yellowstone Midco (YSS) report for Louis R. Brothers Jr?

Yellowstone Midco reported that director Louis R. Brothers Jr received 5,294 shares of common stock as an equity grant. The transaction was coded as an acquisition at $0 per share, indicating stock-based compensation rather than an open-market purchase.

How many Yellowstone Midco (YSS) shares did the director acquire and at what price?

The director acquired 5,294 shares of Yellowstone Midco common stock at a reported price of $0 per share. This structure is typical for restricted stock unit grants, which represent compensation rather than cash-funded buying in the open market.

Are the Yellowstone Midco (YSS) shares granted to the director restricted?

Yes. The 5,294 Yellowstone Midco common shares are represented by restricted stock units that vest on the first anniversary of the grant date. Until vesting, they generally remain subject to forfeiture and cannot be freely transferred like fully vested shares.

What is the vesting schedule for the Yellowstone Midco (YSS) restricted stock units?

The Form 4 states that the restricted stock units vest on the first anniversary of the grant date. This means the 5,294 units awarded on January 30, 2026 are scheduled to vest together one year after that grant date, subject to applicable conditions.

How many Yellowstone Midco (YSS) shares does Louis R. Brothers Jr own after this transaction?

After the reported transaction, Louis R. Brothers Jr beneficially owns 5,294 shares of Yellowstone Midco common stock. The Form 4 shows these shares as held directly, reflecting the full amount associated with the restricted stock unit grant.

Is this Yellowstone Midco (YSS) insider transaction a buy or a compensation grant?

The transaction is a compensation grant, not a market buy. The director received 5,294 restricted stock units at $0 per share, a structure typical for equity awards granted as part of director or executive compensation rather than cash purchases on the market.