York Space Systems Inc.
Last updated September 27, 2026
Organization details
- Legal name
- York Space Systems Inc.
- Former names
- Yellowstone Midco Holdings II, LLC
- Ownership
- Public
- Status
- Active
- SIC code
- 3760 — Guided Missiles & Space Vehicles & Parts
- Jurisdiction of incorporation
- Delaware
- Headquarters city
- Greenwood Village
- Headquarters state / province
- Colorado
- Headquarters country
- United States
- Fiscal year end
- December
- Ticker symbol
- YSS
- Primary stock exchange
- NYSE
Identifiers
- SEC CIK
- 0002086587
Board of directors
-
Andrew Boyd · DirectorSince 2026
-
Dirk Wallinger · Director · Chief Executive OfficerSince 2026
-
James McConville · DirectorSince 2026
-
Janine Davidson · DirectorSince 2026
-
Kirk Michael Konert · DirectorSince 2026
-
Louis R. Brothers Jr. · DirectorSince 2026
-
Tami A. Erwin · DirectorSince 2026
-
Tyler Letarte · DirectorSince 2026
Chief executives
Dirk Wallinger
· Chief Executive Officer
Since January 2026
Board connections
5 of this board's directors also sit on 8 other boards.
- via James McConville and Louis R. Brothers Jr.
- via James McConville
- via Tami A. Erwin
- via Tami A. Erwin
- via Kirk Michael Konert
- via Louis R. Brothers Jr.
- via Janine Davidson
- via Tami A. Erwin
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
- Bought, last 12 months
- $25,734,974
- 3 purchases by 3 insiders
- Sold, last 12 months
- $18,414,916
- 10 sales by 1 insider
| Date | Insider | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Aug 7, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −200,170 | $10.99 | $2,199,868 |
| Aug 6, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −201,504 | $11.60 | $2,337,446 |
| Aug 5, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −116,162 | $13.49 | $1,567,025 |
| Aug 5, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −11,784 | $15.28 | $180,060 |
| Aug 4, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −77,743 | $15.02 | $1,167,700 |
| Aug 4, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −456,310 | $15.58 | $7,109,310 |
| Aug 3, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −13,754 | $15.03 | $206,723 |
| Jul 31, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −35,574 | $15.14 | $538,590 |
| Jul 30, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −140,823 | $15.18 | $2,137,693 |
| Jul 29, 2026 | BlackRock Portfolio Management LLC 10% owner | Open-market sale | −63,390 | $15.31 | $970,501 |
| Jul 8, 2026 | AEROEQUITY GP, LLC 10% owner | Grant or award | +2,289,366 | $34.00 | $77,838,444 |
| Jun 4, 2026 | AEROEQUITY GP, LLC 10% owner | Grant or award | +287,789 | $34.00 | $9,784,826 |
| Apr 10, 2026 | Janine Davidson Director | Grant or award | +4,381 | — | — |
| Jan 30, 2026 | Frantz Brian D Officer (Chief Accounting Officer) | Grant or award | +10,294 | — | — |
| Jan 30, 2026 | Tami A. Erwin Director | Grant or award | +5,294 | — | — |
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