Director Erwin Tami increases Yellowstone Midco Holdings II (YSS) stake

Rhea-AI Filing Summary

Yellowstone Midco Holdings II, LLC director Erwin Tami A. reported two transactions in the company’s common stock dated January 30, 2026. He received 5,294 restricted stock units, which vest on the first anniversary of the grant date, at a price of $0 per unit.

On the same date, he purchased 2,941 shares of common stock at $34 per share, which represents the price to the public in the issuer’s initial public offering. After these transactions, he directly held 79,984 shares of common stock.

Insider Trade Summary

Net Buyer: 2,941 shares ($99,994)

Net Buy 2 txns

Insider Erwin Tami A.

Role Director

Bought 2,941 shs ($100K)

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	5,294	$0.00	--
Purchase	Common Stock	2,941	$34.00	$100K

Holdings After Transaction: Common Stock — 77,043 shares (Direct)

Footnotes (1)

1. Represents restricted stock units which vest on the first anniversary of the grant date. Represents the price to the public in the issuer's initial public offering.

Form 4 Insider Transactions: What Each Field Means →

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^*

Erwin Tami A.

(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	77,043	D
Common Stock	01/30/2026		P		2,941	A	$34(2)	79,984	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.

2. Represents the price to the public in the issuer's initial public offering.

	/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.
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 transactions did Erwin Tami A. report for Yellowstone Midco Holdings II (YSS)?

Erwin Tami A., a director of Yellowstone Midco Holdings II, reported receiving 5,294 restricted stock units at $0 and purchasing 2,941 common shares at $34 on January 30, 2026, bringing his direct holdings to 79,984 shares.

How many Yellowstone Midco (YSS) shares does director Erwin Tami A. own after this Form 4?

After the reported transactions, director Erwin Tami A. directly owns 79,984 shares of Yellowstone Midco common stock. This reflects a grant of 5,294 restricted stock units and a separate open-market purchase of 2,941 shares at $34 per share.

What is the nature of the 5,294-share award reported by Yellowstone Midco (YSS) director Erwin Tami A.?

The 5,294-share award represents restricted stock units granted to director Erwin Tami A. These units vest on the first anniversary of the grant date, meaning he must remain eligible through that date for the units to fully convert into common shares.

At what price did Yellowstone Midco (YSS) director Erwin Tami A. buy common stock?

Director Erwin Tami A. purchased 2,941 shares of Yellowstone Midco common stock at $34 per share. According to the disclosure, this $34 price represents the price to the public in the issuer’s initial public offering.

Are Erwin Tami A.’s Yellowstone Midco (YSS) holdings reported as direct or indirect ownership?

All the reported Yellowstone Midco common stock holdings for Erwin Tami A. are classified as direct ownership. The Form 4 indicates the ownership form as “D” for direct, with no separate nature of indirect beneficial ownership disclosed.