Every Form 4 that York Space Systems (Yellowstone) (YSS) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow YSS and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full YSS filings page.
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.
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.
BlackRock Portfolio Management LLC, reporting as a ten percent owner of York Space Systems Inc., disclosed indirect open-market sales totaling 661,999 shares of common stock on August 4–5, 2026. One block sold at $13.49 per share; other blocks used weighted average prices with individual trades ranging from $14.28 to $16.00 per share. The shares are held across numerous advised funds and accounts, for which BlackRock and related entities disclaim beneficial ownership beyond their pecuniary interests.
BlackRock Portfolio Management LLC, a more-than-10% owner of York Space Systems Inc., reported indirect open-market sales of 35,574 and 13,754 shares of common stock on July 31 and August 3, 2026, at weighted-average prices of $15.14 and $15.03 per share. The shares are held across numerous BlackRock-advised funds and accounts, and BlackRock and related managers expressly disclaim beneficial ownership except to the extent of their pecuniary interest.
BlackRock Portfolio Management LLC, a 10% owner of York Space Systems Inc., reported indirect sales totaling 204,213 shares of common stock on July 29–30, 2026, at weighted average prices of $15.31 and $15.18 per share, with execution ranges of $15.27–$16.07 and $15.00–$15.65. The shares are held across numerous advised funds and accounts, and the reporting entities disclaim beneficial ownership beyond their pecuniary interests.
AEROEQUITY GP, LLC reported acquisition or exercise transactions in this Form 4 filing.
York Space Systems Inc. reported that investment entities affiliated with AE Industrial Partners received an indirect grant of 2,289,366 shares of common stock at $34.00 per share on July 8, 2026. The shares were issued to several AE Industrial funds as consideration under an Agreement and Plan of Merger dated April 29, 2026 among York Space Systems Inc., All.Space Holdings, Inc. and other parties. After this award, the AE Industrial complex is reported as indirectly holding 32,915,588 shares of York common stock. AeroEquity GP, LLC, ultimately controlled by Michael Greene and David Rowe, oversees voting and investment decisions for these funds, and all parties disclaim beneficial ownership beyond their pecuniary interest.
York Space Systems Inc. reported that AE Industrial HorizonX Venture Fund II, LP received an award of 430,134 shares of common stock at $34.00 per share. The grant was issued under an Agreement and Plan of Reorganization involving Solestial, Inc. and other parties.
Following this indirect acquisition, entities associated with AE Industrial Partners collectively hold 30,626,222 shares of York Space Systems common stock. These entities are ultimately controlled by AeroEquity GP, LLC, whose managing members Michael Greene and David Rowe make all voting and investment decisions, while all parties disclaim beneficial ownership beyond their pecuniary interests.
York Space Systems Inc. reported an insider Form 4 showing an indirect acquisition of common stock tied to a merger. AE Industrial HorizonX Venture Fund II, LP received 287,789 shares of York common stock at $34.00 per share under an Agreement and Plan of Reorganization among York Space Systems, Solestial, Inc. and related parties dated May 15, 2026. After this issuance, entities managed by AE Industrial Partners collectively held 30,483,877 York shares. These holdings are ultimately controlled by AeroEquity GP, LLC, whose managing members Michael Greene and David Rowe make voting and investment decisions, while all parties disclaim beneficial ownership beyond their pecuniary interests.
Davidson Janine reported acquisition or exercise transactions in this Form 4 filing.
York Space Systems Inc. director Janine Davidson reported receiving a grant of 4,381 shares of Common Stock in the form of restricted stock units. These units were awarded at no cash cost per share and represent a compensation-related equity award rather than an open-market purchase.
The restricted stock units vest in full on January 30, 2027, meaning Davidson will gain full ownership of the underlying shares on that date if the vesting conditions are met. Following this grant, she holds 4,381 shares directly, reflecting her current reported equity position from this filing.
Wallinger Dirk reported acquisition or exercise transactions in this Form 4 filing.
York Space Systems Inc. Chief Executive Officer Dirk Wallinger reported an amended equity award of 211,176 shares of Common Stock in the form of restricted stock units that vest over three years. These units were granted at a price of $0.00 per share as compensation, not a market purchase.
Following this grant, Wallinger directly holds 9,783,222 shares of Common Stock. The amendment also clarifies that 358,744 restricted shares had already been reported previously on a Form 3 and were inadvertently double-counted in the original Form 4, so this filing corrects his disclosed holdings.