Officer at Yellowstone Midco (YSS) awarded 54,412 RSUs and reports large trust holding

Rhea-AI Filing Summary

Yellowstone Midco Holdings II, LLC reported that officer Monica J. Palko, Chief Legal and Administrative Officer, received an award of 54,412 shares of common stock on January 30, 2026. The award is in the form of restricted stock units that vest over three years and was granted at $0 per share.

Following this grant, Palko directly holds 54,412 shares of common stock. She is also reported as indirectly holding 680,593 shares of common stock through the Fox Trail Joint Revocable Trust.

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
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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^*

Palko Monica J.

(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)

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

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		54,412(1)	A	$0	54,412	D
Common Stock								680,593	I	By Fox Trail Joint Revocable Trust

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 over three years.

Remarks:

Chief Legal and Administrative Officer

	/s/ Monica Palko	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.
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.

FAQ

What insider transaction did Yellowstone Midco (YSS) report for Monica J. Palko?

Yellowstone Midco reported that officer Monica J. Palko received 54,412 shares of common stock as a restricted stock unit award. The grant was made on January 30, 2026 at $0 per share and vests over three years.

How many Yellowstone Midco (YSS) shares were granted to Monica J. Palko?

Monica J. Palko was granted 54,412 shares of Yellowstone Midco common stock through restricted stock units. These units vest over three years, meaning she will earn the shares gradually rather than all at once, subject to the award’s terms.

What is the vesting schedule of Monica J. Palko’s Yellowstone Midco (YSS) restricted stock units?

The restricted stock units granted to Monica J. Palko vest over three years. This three-year vesting period generally means the award is earned in stages over time, encouraging continued service with Yellowstone Midco Holdings II, LLC.

What is Monica J. Palko’s officer role at Yellowstone Midco (YSS)?

Monica J. Palko is reported as an officer of Yellowstone Midco Holdings II, LLC, serving as Chief Legal and Administrative Officer. This role is noted in the remarks section of the insider ownership report filed for the share grant.

How many Yellowstone Midco (YSS) shares does Monica J. Palko own directly after the grant?

After the reported transaction, Monica J. Palko directly owns 54,412 shares of Yellowstone Midco common stock. These shares reflect the full amount of the restricted stock unit award granted on January 30, 2026 at $0 per share.

What indirect Yellowstone Midco (YSS) holdings are reported for Monica J. Palko?

The filing reports that 680,593 shares of Yellowstone Midco common stock are held indirectly for Monica J. Palko through the Fox Trail Joint Revocable Trust. This trust-related position is classified as indirect beneficial ownership in the report.