YSS · Insider Trading
York Space Systems Inc.
Every open-market purchase and sale reported by YSS officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-10 | BlackRock Portfolio Management LLC | 10%+ Owner | Sell | −401,674 | −$4.54M |
| 2026-08-10 | BlackRock Portfolio Management LLC | 10%+ Owner | Sell | −674,604 | −$10.22M |
| 2026-08-06 | BlackRock Portfolio Management LLC | 10%+ Owner | Sell | −661,999 | −$10.02M |
| 2026-08-06 | BlackRock Portfolio Management LLC | 10%+ Owner | Sell | −661,999 | −$10.02M |
| 2026-08-04 | BlackRock Portfolio Management LLC | 10%+ Owner | Sell | −49,328 | −$745.31K |
| 2026-07-31 | BlackRock Portfolio Management LLC | 10%+ Owner | Sell | −204,213 | −$3.11M |
| 2026-07-10 | Michael Robert Greene | 10%+ Owner | A | +6,868,098 | +$233.52M |
| 2026-06-29 | Michael Robert Greene | 10%+ Owner | A | +1,290,402 | +$43.87M |
| 2026-06-05 | Michael Robert Greene | 10%+ Owner | A | +863,367 | +$29.35M |
| 2026-04-14 | Janine Davidson | Director | A | +4,381 | — |
| 2026-03-11 | Dirk Wallinger | Chief Executive Officer | A | +211,176 | — |
| 2026-02-03 | Kirk Michael Konert | Director | A | +5,294 | — |
| 2026-02-03 | BlackRock Portfolio Management LLC | 10%+ Owner | Buy | +752,500 | +$25.59M |
| 2026-02-03 | James McConville | Director | A | +5,294 | — |
| 2026-02-03 | Kevin Messerle | Chief Financial Officer | A | +80,882 | — |
| 2026-02-03 | Brian D Frantz | Chief Accounting Officer | A | +10,294 | — |
| 2026-02-03 | Tyler Letarte | Director | MIXED | +6,764 | +$49.98K |
| 2026-02-03 | Monica J. Palko | See Remarks | A | +54,412 | — |
| 2026-02-03 | Tami A. Erwin | Director | MIXED | +8,235 | +$99.99K |
| 2026-02-03 | Louis R Brothers Jr | Director | A | +5,294 | — |
| 2026-02-03 | Andrew Boyd | Director | A | +5,294 | — |
| 2026-02-03 | Devjyoti Rudra | Chief Supply Chain Officer | A | +23,529 | — |
| 2026-02-03 | Dirk Wallinger | Chief Executive Officer | A | +569,920 | — |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| Michael Robert Greene | 10%+ Owner | 32,915,588 | $183.67M |
| BlackRock Portfolio Management LLC | 10%+ Owner | 16,930,673 | $94.47M |
| Dirk Wallinger | Chief Executive Officer | 10,010,663 | $55.86M |
| Kevin Messerle | Chief Financial Officer | 998,319 | $5.57M |
| Monica J. Palko | See Remarks | 735,005 | $4.10M |
| Devjyoti Rudra | Chief Supply Chain Officer | 358,357 | $2.00M |
| Tami A. Erwin | Director | 77,043 | $429.90K |
| Brian D Frantz | Chief Accounting Officer | 16,000 | $89.28K |
| Tyler Letarte | Director | 6,764 | $37.74K |
| Kirk Michael Konert | Director | 5,294 | $29.54K |
| Louis R Brothers Jr | Director | 5,294 | $29.54K |
| James McConville | Director | 5,294 | $29.54K |
| Andrew Boyd | Director | 5,294 | $29.54K |
| Janine Davidson | Director | 4,381 | $24.45K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the YSS quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.