Form4insider filings, from the source

Company · CIK 0002086587 · SIC 3760 — Guided Missiles & Space Vehicles & Parts · NYSE

York Space Systems Inc. · YSS

Insider activity reported against this company. All insider holders · On EDGAR ↗

1M3M6M1Y2YAll datashares as filed — not split-adjusted
Open-market buys & salesbuys $0 · 0sales $18.6M · 4net −$18.6M
$10k$10k$1M$1M$100M$100MbuyssalesJul 28Jul 29Jul 31Aug 2Aug 3Aug 5Aug 7

Reported at this company — common stock

TradeReported (ET)InsiderSharesAvg priceTotalOwned afterΔ stakeFlags
Aug 6, 2026 SForm 4 →Aug 10, 6:16 pm EDTBlackRock Portfolio Management LLC10% Owner401,674$11.30$4,537,31516,517,115−2.37%
Aug 4, 2026 SForm 4/A →Aug 10, 6:02 pm EDTBlackRock Portfolio Management LLC10% Owner674,604$15.15$10,220,26116,918,789−3.83%
Aug 4, 2026 SForm 4 →Aug 6, 4:02 pm EDTBlackRock Portfolio Management LLC10% Owner661,999$15.14$10,024,09516,931,394−3.76% amended
Jul 31, 2026 SForm 4 →Aug 4, 4:17 pm EDTBlackRock Portfolio Management LLC10% Owner49,328$15.11$745,31317,593,393−0.28%
Jul 29, 2026 SForm 4 →Jul 31, 4:47 pm EDTBlackRock Portfolio Management LLC10% Owner204,213$15.22$3,108,19417,642,721−1.14%
Jul 8, 2026 AForm 4 →Jul 10, 4:05 pm EDTAEROEQUITY GP, LLC +210% Owner2,289,366$34.00$77,838,44432,915,588—
Jun 4, 2026 AForm 4/A →Jun 29, 4:05 pm EDTAEROEQUITY GP, LLC +210% Owner430,134$34.00$14,624,55630,626,222—
Jun 4, 2026 AForm 4 →Jun 5, 4:05 pm EDTAEROEQUITY GP, LLC +210% Owner287,789$34.00$9,784,82630,483,877— amended

Reported at this company — derivatives (options, RSUs, warrants)

No reported derivative activity in this period.