York Space Systems' IPO

Q: When does the lock-up end?

York Space Systems' IPO lock-up ends Jul 27, 2026 at the latest; its prospectus lets it end sooner on the terms it sets out. Its final prospectus says: “.”

Listed Jan 29, 2026 at $34 on NYSE as YSS.

Offer price

$34

Market cap

$4.32B

18,500,000

Today 81% below its $34 offer price; its first day closed -1.1%.

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From its final prospectus (424B4) on SEC EDGAR, filed Jan 30, 2026.

What does York Space Systems do?

“York is one of the only space and defense primes with proprietary hardware and software capabilities designed to address customers' complex mission requirements across the critical elements of the entire space ecosystem throughout the mission lifecycle.”

From its final prospectus (424B4), filed Jan 30, 2026

York Space Systems' facts, each with its source
Fact	York Space Systems
Founded	2012From its final prospectus (424B4) of Jan 30, 2026
Headquarters	Greenwood Village, ColoradoFrom its final prospectus (424B4) of Jan 30, 2026
Employees	670 full-time, as of September 30, 2025From its final prospectus (424B4) of Jan 30, 2026
Website	yorkspacesystems.comFrom its final prospectus (424B4) of Jan 30, 2026

What is the offering?

Each figure names the filing it is from and that filing's date. The market cap is Breakaway's arithmetic from the prospectus's share count.

York Space Systems' facts, each with its source
Fact	York Space Systems
Shares offered	18,500,000From the final prospectus (424B4) filed Jan 30, 2026
Offer price	$34 a shareFrom the final prospectus (424B4) filed Jan 30, 2026
Raised at that price	$629 millionFrom the final prospectus (424B4) filed Jan 30, 2026
Underwriters' discount	$36.2 millionFrom the final prospectus (424B4) filed Jan 30, 2026
Underwriters' option	2,775,000 more sharesFrom the final prospectus (424B4) filed Jan 30, 2026
Underwriters	Joint Book-Runners, Goldman Sachs, Jefferies, Wells Fargo, J.P. Morgan, and Citigroup, and 6 moreFrom the final prospectus (424B4) filed Jan 30, 2026, as its cover names them
Exchange	New York Stock Exchange, as YSSFrom the final prospectus (424B4) filed Jan 30, 2026
Shares outstanding after	126,944,387From the final prospectus (424B4) filed Jan 30, 2026
Market cap at the offer price	$4.32 billionBreakaway's arithmetic from the prospectus's share count

What risks does York Space Systems name first?

“We may experience cost overruns on our contracts, including before final receipt of a contract, which would require us to absorb the excess costs and potentially reduce our cash flow and profitability.”
“Concentration of our customers and backlog, in particular our largest customer, the SDA.”
“We may fail to implement and maintain an effective system of internal control over financial reporting, and as a result may not be able to accurately determine or disclose our financial results.”

The first three of the risks its prospectus summary lists, in the company's words. The rest, and each in full, are in the filing. Read the filing.

Every date of York Space Systems' IPO

York Space Systems' IPO dates, each with its source
What	Day	Source
Registration filedForm S-1, SEC EDGAR	Nov 17, 2025	Form S-1, SEC EDGAR
Declared effective by the SECSEC notice of effectiveness, SEC EDGAR	Jan 28, 2026	SEC notice of effectiveness, SEC EDGAR
Pricedfinal prospectus (424B4), filed Jan 30, SEC EDGAR	Jan 28, 2026	final prospectus (424B4), filed Jan 30, SEC EDGAR
Exchange registration filedexchange registration (Form 8-A), SEC EDGAR	Jan 29, 2026	exchange registration (Form 8-A), SEC EDGAR
First tradeMassive's IPO calendar	Jan 29, 2026	Massive's IPO calendar
Lock-up endsfinal prospectus, SEC EDGAR: “”	Jul 27, 2026, at the latest	final prospectus, SEC EDGAR: “”

How did its first days trade?

From its daily bars, each close against its $34 offer price.

York Space Systems' first sessions
Day	Open	Close	From the offer
Jan 29	$38	$33.61	-1.1%
Jan 30	$34.50	$33.95	-0.1%
Feb 2	$34	$29.22	-14.1%
Feb 3	$29.50	$26.52	-22.0%
Feb 4	$26.37	$24.90	-26.8%

What is York Space Systems' Quality Score?

-2

Poor

187 trading days so far; 1 of the 14 checks wait for more history.

YSS's page, with every reason behind its score

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York Space Systems IPO questions

When is York Space Systems' IPO?

Listed Jan 29, 2026 at $34 on NYSE as YSS.

What is York Space Systems' IPO price?

York Space Systems' IPO priced at $34 a share, per its final prospectus of Jan 30, 2026.

How many shares is York Space Systems selling?

18,500,000 shares, and the underwriters may buy 2,775,000 more, per its final prospectus (424B4).

Who are the underwriters?

Joint Book-⁠Runners, Goldman Sachs, Jefferies, Wells Fargo, J.P. Morgan, Citigroup, Truist Securities, Baird, Raymond James, Canaccord Genuity, Needham, and Academy Securities, as the prospectus's cover names them.

When does the lock-up end?

York Space Systems' IPO lock-⁠up ends Jul 27, 2026 at the latest; its prospectus lets it end sooner on the terms it sets out. Its final prospectus says: “.”

Does Breakaway rate York Space Systems?

York Space Systems has a Quality Score of -2 today. The score counts the 14 chart checks and the company's filings; a check that needs more history than a new stock has waits for it.

Can Breakaway say where York Space Systems' price will go?

No. Breakaway does not say where a price will go. Every figure here is from the company's SEC filings, linked on each line.

Where every figure comes from.

Each company's SEC filings on EDGAR, read twice a day: its registration (Form S-1 or F-1), the amendment that sets its price range, and its final prospectus (424B4). The shares, the price, the underwriters, the lock-up, and the company's words are the filing's, linked on each line.
The expected day is Massive's IPO calendar's, the first trade the market data's, and the moves each stock's daily closes against its offer price.
The market cap is Breakaway's arithmetic: the shares the prospectus says will be outstanding after the offering, times the midpoint of the range or the offer price.
The Quality Score is Breakaway's, from a stock's second trading day; for its first 21 sessions it is marked New listing, and each check that needs more history waits for it.
Blank-check companies (SPACs) and unit offerings are left out and counted; a direct listing and a US listing of a company listed abroad are in and marked.

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