York Space Systems, Inc.

York Space Systems (YSS) has a market cap of US$1.2B as of Oct 2, 2026 close, #15 among listed space companies. How it is built

YSS on NYSE · USA

Market cap

US$1.2B

Priced on NYSE (YSS) · as of Oct 2, 2026 close

Shares outstanding

137.4M

Shares as of Aug 12, 2026 · 10-Q filed Aug 14, 2026 (SEC EDGAR)

Segment

Defense space

Companies whose main business is national-security satellites

Next event

—

Nothing on the calendar yet

Price · NYSE (YSS)

as of Oct 2, 2026End of day

US$8.975▲ +4.4%

Regular-session last sale across US venues on Oct 2, 2026, not the official closing auction price.

Oct 2, 2026 · US$8.975

Change: ▼ −73.6%
High: US$43.45 Apr 22, 2026
Low: US$7.46 Sep 10, 2026
Range: Jan 29, 2026 to Oct 2, 2026 · 171 sessions

Regular-session last sales, as traded. Prices are not adjusted for share splits.

What they do

as of Oct 3, 2026

York Space Systems builds standardised satellite buses and complete satellites, mainly for US national security programmes such as the Space Development Agency's constellations. It is headquartered in Denver, Colorado. Its shares have traded on the New York Stock Exchange as YSS since January 29, 2026, following its initial public offering.

A plain description of the business, reviewed Oct 3, 2026. Drawn from: Form 10-K for 2025 and 424B4 prospectus (CIK 0002086587). Corrections: see corrections.

Recent filings and events

as of Oct 1, 2026

Last results filing: Form 10-Q: quarterly report, filed Aug 14, 2026 · period Jun 30, 2026

Aug 14, 202610-QQuarterly report · SEC EDGAR
Aug 14, 2026SCHEDULE 13G/APassive ownership report (amendment) · SEC EDGAR
Aug 13, 20268-KItems 2.02, 9.01 · SEC EDGAR
Aug 13, 2026EarningsYork Space Systems reported results of operations (Form 8-K, item 2.02) · SEC EDGAR
Aug 5, 20268-KItems 5.02, 7.01, 9.01 · SEC EDGAR
Jun 4, 20268-K/AItem 3.02 · SEC EDGAR
May 19, 20268-KItem 3.02 · SEC EDGAR
May 15, 202610-QQuarterly report · SEC EDGAR
May 15, 2026SCHEDULE 13GPassive ownership report · SEC EDGAR
May 15, 2026SCHEDULE 13GPassive ownership report · SEC EDGAR

Sources: SEC EDGAR. All filings on EDGAR. Insider forms (Form 4) are in the table below. Dated events are on the calendar and the launch manifest.

Insider transactions (Form 4)

Last 10 insider transactions reported on Form 4
Date	Reporting person	Transaction	Shares	Price	Owned after	Filing
Aug 7, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−200,170	US$10.99	16,517,115	Form 4 filed Aug 10, 2026
Aug 6, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−201,504	US$11.60	16,717,285	Form 4 filed Aug 10, 2026
Aug 5, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−116,162	US$13.49	16,930,673	Form 4 filed Aug 10, 2026
Aug 5, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−11,884	US$15.28	16,918,789	Form 4 filed Aug 10, 2026
Aug 5, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−116,162	US$13.49	16,943,178	Form 4 filed Aug 6, 2026
Aug 5, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−11,784	US$15.28	16,931,394	Form 4 filed Aug 6, 2026
Aug 4, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−78,082	US$15.02	17,515,311	Form 4 filed Aug 10, 2026
Aug 4, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−468,476	US$15.58	17,046,835	Form 4 filed Aug 10, 2026
Aug 4, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−77,743	US$15.02	17,515,650	Form 4 filed Aug 6, 2026
Aug 4, 2026	BlackRock Portfolio Management LLC10% owner	Open-market or private sale · indirect (See footnotes)	−456,310	US$15.58	17,059,340	Form 4 filed Aug 6, 2026

What each Form 4 reported, as filed. Non-derivative transactions only; option grants and exercises appear on the filing itself. All filings on EDGAR.

Contract awards · last 12 months

No US federal contract award of US$250K or more on file for the last 12 months.

US federal awards of US$250K or more, from USAspending.gov. Amounts are as the source states them. Defense awards reach USAspending about 90 days after signing.

Upcoming events

Nothing on the manifest for York Space Systems yet.

Each row links to its source. The calendar lists every company's dates; the full launch manifest explains the status labels.

Peers

No other company on this list has a computed market cap yet.

All defense space companies by market cap · Space industry market cap · Leaderboard

Listings

Every listing of York Space Systems, Inc.
Ticker	Exchange	Currency	Share class	Role
YSS	NYSE	USD	Common	Pricing listing

Share classes

as of Aug 12, 2026

Shares outstanding by class
Class	Shares	As of	Counted	Source
Common	137,357,605	Aug 12, 2026	At its own listed price	SEC EDGAR

How this market cap is built

as of Oct 2, 2026End of day

Shares outstanding: 137,357,605 · every class, counted once · shares as of Aug 12, 2026 · from the 10-Q filed Aug 14, 2026
Price: US$8.975 · priced on NYSE (YSS) · regular-session last sale on Oct 2, 2026
Market cap: US$1.2B = 137,357,605 shares × US$8.975
In Canadian dollars: C$1.8B · Bank of Canada rate for Oct 2, 2026: US$1 = C$1.4246
On the list: Number 15 of 24 pure plays with a computed market cap, 0.1% of their total. Defense space companies by market cap.

Market cap = shares outstanding × one price × one exchange rate (methodology). The price is a last sale across several US venues, not the official closing auction price.

How this number is built: methodology. Where the data comes from: sources. Who runs this site and what they hold: disclosures. More: Defense space · leaderboard · space industry market cap.