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BlackRock Portfolio Management LLC (YSS) discloses 674K-share York Space Systems sale

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4/A

Rhea-AI Filing Summary

BlackRock Portfolio Management LLC, as a ten percent owner of York Space Systems Inc., reported indirect open-market sales of a total of 674,604 shares of common stock on August 4–5, 2026, at per-share prices from $13.49 to $15.58. The shares are held across numerous advised funds and accounts, for which beneficial ownership is expressly disclaimed except for any pecuniary interest. This amendment also notes previously omitted sales of 12,505 shares at $15.69 on August 4 and 100 shares at $15.13 on August 5.

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Insider BlackRock Portfolio Management LLC
Role 10% Owner
Sold 674,604 shs ($10.22M)
Type Security Shares Price Value
Sale Common Stock F1, F2, F3 116,162 $13.49 $1.57M
Sale Common Stock F6, F1, F2, F3 11,884 $15.28 $182K
Sale Common Stock F4, F1, F2, F3 78,082 $15.02 $1.17M
Sale Common Stock F5, F1, F2, F3 468,476 $15.58 $7.30M
Holdings After Transaction: Common Stock — 16,918,789 shares (Indirect, See footnotes)
Footnotes (6)
  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.
  4. F4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.28 to $15.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.
  5. F5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $16.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.
  6. F6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.
Total shares sold 674,604 shares Indirect open-market sales of York Space Systems common stock on August 4–5, 2026
Sale on 2026-08-04 468,476 shares at $15.58 per share Indirect sale of common stock reported by BlackRock Portfolio Management LLC
Sale on 2026-08-04 78,082 shares at $15.02 per share Indirect sale with weighted average price range $14.28–$15.27
Sale on 2026-08-05 116,162 shares at $13.49 per share Indirect open-market sale of York Space Systems common stock
Sale on 2026-08-05 11,884 shares at $15.28 per share Indirect sale with weighted average price range $15.00–$15.31
Omitted sale corrected 12,505 shares at $15.69 per share Previously omitted August 4, 2026 sale added by this amendment
Omitted sale corrected 100 shares at $15.13 per share Previously omitted August 5, 2026 sale added by this amendment
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
beneficial ownership financial
"expressly disclaim beneficial ownership of the shares of common stock"
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
"except to the extent of their pecuniary interest therein"
indirect ownership financial
"shares of the Issuer's common stock held by the following funds and accounts"
ten percent owner regulatory
"BlackRock Portfolio Management LLC is reporting Issuer securities as a ten percent owner"

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FAQ

What insider activity did BlackRock Portfolio Management LLC report for YSS?
BlackRock Portfolio Management LLC reported indirect sales of 674,604 York Space Systems (YSS) shares on August 4–5, 2026, in open-market transactions at per-share prices between $13.49 and $15.58, held across various advised funds and accounts.

How many YSS shares were sold in each reported transaction?
The filing lists four sales: 468,476 shares at $15.58 and 78,082 shares at $15.02 on August 4, plus 116,162 shares at $13.49 and 11,884 shares at $15.28 on August 5, 2026, all indirectly held common stock.

What correction does this Form 4/A make for York Space Systems (YSS)?
The amendment corrects a prior Form 4 by adding a sale of 12,505 YSS shares at $15.69 on August 4, 2026, and a sale of 100 shares at $15.13 on August 5, 2026, which were inadvertently omitted from the earlier report.

Were the YSS shares sold directly by BlackRock Portfolio Management LLC?
The shares represent holdings of numerous funds and accounts advised by BlackRock subsidiaries. The reporting person and related managers disclaim beneficial ownership of these York Space Systems shares except to the extent of any pecuniary interest.

What price ranges applied to the YSS sales reported in this filing?
Several transactions used weighted average prices. Shares were sold in multiple trades within ranges of $14.28–$15.27, $15.28–$16.00, and $15.00–$15.31, with a separate transaction reported at $13.49 per share.

Was a Rule 10b5-1 trading plan used for these YSS transactions?
The filing’s Rule 10b5-1 checkbox is not marked as relying on a plan, and the footnotes do not reference any 10b5-1 trading arrangement for the reported York Space Systems share sales.
SEC Form 4
FORM 4UNITED 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)
DirectorX10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/04/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)
08/06/2026
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)
CodeVAmount(A) or (D)Price
Common Stock08/04/2026S78,082D$15.02(4)17,515,311ISee footnotes(1)(2)(3)
Common Stock08/04/2026S468,476D$15.58(5)17,046,835ISee footnotes(1)(2)(3)
Common Stock08/05/2026S116,162D$13.4916,930,673ISee footnotes(1)(2)(3)
Common Stock08/05/2026S11,884D$15.28(6)16,918,789ISee 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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount 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.
4. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.28 to $15.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.
5. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $16.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.
6. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein.
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. This amendment corrects the Form 4 filed on 8/6/26, which inadvertently omitted the sale of 12,505 shares on 8/4/26 at a weighted average price of $15.69 per share and the sale of 100 shares on 8/5/26 at a price of $15.13 per share.
BlackRock Portfolio Management LLC, By: /s/ David Maryles, Authorized Signatory08/10/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR