BlackRock Portfolio Management (YSS) logs 401,674-share York Space Systems stock sale

Rhea-AI Filing Summary

BlackRock Portfolio Management LLC, a 10% owner of York Space Systems Inc., reported two indirect open-market sales of the company’s Common Stock. On August 6, 2026, affiliated funds and accounts sold 201,504 shares at $11.60 per share, followed by 200,170 shares at $10.99 per share on August 7, 2026, for a total of 401,674 shares sold. The shares are held across multiple advised funds and accounts managed by BlackRock subsidiaries, which, together with their managers, expressly disclaim beneficial ownership beyond any pecuniary interest, and state that inclusion of these shares is not an admission of beneficial ownership for Section 16 or other purposes. The filing indicates these transactions were not made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Net Seller: 401,674 shares

Net Sell 2 txns

Insider BlackRock Portfolio Management LLC

Role 10% Owner

Sold 401,674 shs ($4.54M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2, F3	200,170	$10.99	$2.20M
Sale	Common Stock F1, F2, F3	201,504	$11.60	$2.34M

Holdings After Transaction: Common Stock — 16,517,115 shares (Indirect, See footnotes)

Footnotes (3)

1. F1. Represents shares of the Issuer's common stock held by the following funds and accounts under management by certain subsidiaries of BlackRock, Inc.: BlackRock Private Equity Co-Investments, 2021 Aggregator Cayman Ltd., BlackRock Growth Equity Fund Master Cayman Aggregator Ltd., BR POF IV CAYMAN MASTER FUND, L.P., BlackRock Private Opportunities Fund IV, L.P., BlackRock Private Opportunities Fund IV Master SCSp, TSCL Private Markets Cayman Fund Ltd., 1885 Private Opportunities Cayman Fund, Ltd., Heathrow Forest Opportunities Fund, L.P., Lincoln Pension Private Equity BR, L.P., NHRS Private Opportunities Fund, L.P., NDSIB Private Opportunities Fund Cayman Ltd., Mutual of Omaha OF Cayman, Ltd., BlackRock ERI Private Opportunities Master SCSp, Sullivan Way POF Cayman, Ltd, Total Alternatives Fund - Private Equity (B) LP, Total Alternatives Fund - Private Equity LP, 1824 Private Equity Fund, L.P., Tango Capital Opportunities Fund, L.P., BlackRock Private Investments Fund,
2. F2. (Continued from footnote 1) OV Private Opportunities Cayman, Ltd., SONJ Opportunities Cayman, Ltd., Red River Direct Investment Fund III, L.P., MB BlackRock Holdings Cayman Ltd. and certain other funds and accounts managed by BlackRock Financial Management, Inc., BlackRock Institutional Trust Company, National Association, BlackRock Investment Management (UK) Limited and BlackRock Investment Management, LLC (collectively, the "Advised Funds and Accounts"). Each of BlackRock Portfolio Management LLC, the Advised Funds and Accounts and their respective direct or indirect managers, general partners and portfolio managers who share voting and investment power over the shares held by the Advised Funds and Accounts expressly disclaim beneficial ownership of the shares of common stock held by the Advised Funds and Accounts, except to the extent of their pecuniary interest therein,
3. F3. (Continued from footnote 2) and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purposes.

Key Figures

Shares sold 2026-08-06: 201,504 shares at $11.6000 Shares sold 2026-08-07: 200,170 shares at $10.9900 Total shares sold: 401,674 shares

3 metrics

Shares sold 2026-08-06 201,504 shares at $11.6000 Indirect open-market sale of York Space Systems Common Stock

Shares sold 2026-08-07 200,170 shares at $10.9900 Indirect open-market sale of York Space Systems Common Stock

Total shares sold 401,674 shares Combined net-sell activity across both reported transactions

Key Terms

beneficial ownership, pecuniary interest, indirect, Section 16

4 terms

beneficial ownership regulatory

"expressly disclaim beneficial ownership of the shares of common stock held"

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

"disclaim beneficial ownership ... except to the extent of their pecuniary interest"

indirect regulatory

"total_shares_following_transaction: null, direct_or_indirect: "I", nature_of_ownership"

Section 16 regulatory

"not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16"

Section 16 is a U.S. securities law rule that governs the trading and disclosure obligations of company insiders — typically officers, directors and large shareholders — to promote transparency and deter unfair profit-taking. It requires insiders to publicly report their stock trades and allows companies or the issuer to reclaim quick, short-term profits from certain insider trades, like a scoreboard and a refund policy that help investors see and limit possible insider advantage.

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/10/2026 - 06:17 PM Accepted by SEC EDGAR 08/10/2026 - 06:16 PM Learn about SEC filing dates

FAQ

What insider transactions did York Space Systems (YSS) report by BlackRock Portfolio Management LLC?

BlackRock Portfolio Management LLC reported two indirect open-market sales of York Space Systems Common Stock, totaling 401,674 shares sold on August 6 and 7, 2026 through advised funds and accounts managed by BlackRock affiliates.

How many York Space Systems (YSS) shares were sold and at what prices?

Affiliated funds and accounts sold 201,504 shares at $11.60 per share on August 6, 2026, and 200,170 shares at $10.99 per share on August 7, 2026, for a total of 401,674 shares sold indirectly.

Who actually holds the York Space Systems (YSS) shares involved in this Form 4?

The shares are held by multiple funds and accounts under management by subsidiaries of BlackRock, Inc. These include various private equity and opportunities funds that collectively hold the reported YSS common stock positions.

Does BlackRock Portfolio Management LLC admit beneficial ownership of the YSS shares?

No. BlackRock Portfolio Management LLC, the advised funds and accounts, and their managers expressly disclaim beneficial ownership of the YSS shares, except for any pecuniary interest, and state that reporting is not an admission for Section 16 or other purposes.

Were the York Space Systems (YSS) share sales done under a Rule 10b5-1 trading plan?

The filing’s Rule 10b5‑1 checkbox is not marked as using a plan, indicating these reported YSS share sales were not executed pursuant to a Rule 10b5‑1 trading plan adopted under SEC rules.

Is BlackRock Portfolio Management LLC an officer or director of York Space Systems (YSS)?

BlackRock Portfolio Management LLC is reported as a ten percent owner of YSS but not as a director or officer. The entity files as a significant shareholder through funds and accounts it and its affiliates manage.

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^*

BlackRock Portfolio Management LLC

(Last) (First) (Middle)

50 HUDSON YARDS

(Street)

NEW YORK NEW YORK 10001

(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)
08/06/2026

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

X	Form filed by One Reporting Person
	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	08/06/2026		S		201,504	D	$11.6	16,717,285	I	See footnotes(1)(2)(3)
Common Stock	08/07/2026		S		200,170	D	$10.99	16,517,115	I	See footnotes(1)(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

Explanation of Responses:

1. Represents shares of the Issuer's common stock held by the following funds and accounts under management by certain subsidiaries of BlackRock, Inc.: BlackRock Private Equity Co-Investments, 2021 Aggregator Cayman Ltd., BlackRock Growth Equity Fund Master Cayman Aggregator Ltd., BR POF IV CAYMAN MASTER FUND, L.P., BlackRock Private Opportunities Fund IV, L.P., BlackRock Private Opportunities Fund IV Master SCSp, TSCL Private Markets Cayman Fund Ltd., 1885 Private Opportunities Cayman Fund, Ltd., Heathrow Forest Opportunities Fund, L.P., Lincoln Pension Private Equity BR, L.P., NHRS Private Opportunities Fund, L.P., NDSIB Private Opportunities Fund Cayman Ltd., Mutual of Omaha OF Cayman, Ltd., BlackRock ERI Private Opportunities Master SCSp, Sullivan Way POF Cayman, Ltd, Total Alternatives Fund - Private Equity (B) LP, Total Alternatives Fund - Private Equity LP, 1824 Private Equity Fund, L.P., Tango Capital Opportunities Fund, L.P., BlackRock Private Investments Fund,

2. (Continued from footnote 1) OV Private Opportunities Cayman, Ltd., SONJ Opportunities Cayman, Ltd., Red River Direct Investment Fund III, L.P., MB BlackRock Holdings Cayman Ltd. and certain other funds and accounts managed by BlackRock Financial Management, Inc., BlackRock Institutional Trust Company, National Association, BlackRock Investment Management (UK) Limited and BlackRock Investment Management, LLC (collectively, the "Advised Funds and Accounts"). Each of BlackRock Portfolio Management LLC, the Advised Funds and Accounts and their respective direct or indirect managers, general partners and portfolio managers who share voting and investment power over the shares held by the Advised Funds and Accounts expressly disclaim beneficial ownership of the shares of common stock held by the Advised Funds and Accounts, except to the extent of their pecuniary interest therein,

3. (Continued from footnote 2) and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purposes.

Remarks:

In accordance with SEC Release No. 34-39538 (January 12, 1998), BlackRock Portfolio Management LLC is reporting Issuer securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. This filing does not include Issuer securities, if any, beneficially owned by other business units whose beneficial ownership of securities is disaggregated from that of the Reporting Business Units in accordance with such release.

	BlackRock Portfolio Management LLC, By: /s/ David Maryles, Authorized Signatory	08/10/2026
	** 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)