York Space Systems Inc.

Last updated September 27, 2026

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Organization details

Legal name: York Space Systems Inc.
Former names: Yellowstone Midco Holdings II, LLC
Ownership: Public
Status: Active
Sector (GICS): Industrials
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

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Andrew Boyd · Director
Since 2026
Dirk Wallinger · Director · Chief Executive Officer
Since 2026
James McConville · Director
Since 2026
Janine Davidson · Director
Since 2026
Kirk Michael Konert · Director
Since 2026
Louis R. Brothers Jr. · Director
Since 2026
Tami A. Erwin · Director
Since 2026
Tyler Letarte · Director
Since 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. 5 are in the same sector.

Shared director Other board Same sector

Redwire Corporation Same sector
via James McConville and Louis R. Brothers Jr.
Beta Technologies Inc. Same sector
via James McConville
Deere & Company Same sector
via Tami A. Erwin
F5 Inc.
via Tami A. Erwin
Firefly Aerospace Inc. Same sector
via Kirk Michael Konert
Leonardo DRS Inc. Same sector
via Louis R. Brothers Jr.
UMB Financial Corporation
via Janine Davidson
Xerox Holdings Corporation
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	Michael Robert Greene 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	—	—

Peers

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Questions about York Space Systems Inc.

Who is the CEO of York Space Systems Inc.?

Dirk Wallinger has been York Space Systems Inc.'s Chief Executive Officer since January 2026.

How many directors are on York Space Systems Inc.'s board?

York Space Systems Inc.'s board has 8 directors: Andrew Boyd, Dirk Wallinger, James McConville, Janine Davidson, Kirk Michael Konert, Louis R. Brothers Jr., Tami A. Erwin and Tyler Letarte.

Are York Space Systems Inc. insiders buying or selling shares?

Over the last 12 months, York Space Systems Inc. insiders bought $25.7 million of shares in 3 purchases and sold $18.4 million of shares in 10 sales on the open market, as reported to the SEC on Forms 4 and 5.

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