Stocks › Aerospace & Defense › YSS

York Space Systems YSS

US equityMarket cap rank #3231Aerospace & Defense Space

$7.38 −$0.65 (-8.09%)

Pre-market · Oct 8, 7:00 am ET · After hours $7.40 +0.26%

Open$7.86

Prev close$8.03

Day range$7.20 – $7.86

Volume2.73M

Market cap$1.01B

P/E (TTM)–

Dividend yield–

Ownership & positioning

Who holds it, who is betting against it, and where the big money is moving

Institutional ownership62.7%-2.86 pts vs. prior quarter

Institutions holding203+2 vs. prior quarter

Insider trades (recent)17 buys / 5 sellsNet buying

Short interest5.38% of floatDays to cover 2.6 · as of 15 Sep 2026

Short-sale volume share28.0%5-day average of daily volume

Short-sale volume as % of daily volume

Large-order net flow, last 20 sessions

Net of large-order buying minus selling, in USD. Over this window: −$953.0K (10 inflow days, 10 outflow days).

Net flow by order size, last 20 sessions

Super/Big orders approximate institutional-size trades; Mid/Small approximate retail-size trades. Net buy minus sell value in each bucket, summed over the window.

The five largest holders on file together own 47.5% of shares outstanding.

Largest holders

AE Industrial Partners, LP23.96%
BlackRock12.02%
Dirk Wallinger8.13%
Pacific Investment Management Company LLC1.99%
Hood River Capital Management LLC1.43%
Tema ETFs LLC1.39%
Tidal Investments LLC1.34%
Westwood Management Corp.1.26%

By investor type

Mutual Fund34.85%
VC/PE Fund24.82%
Individual/Insider9.65%
Hedge Fund1.45%
Public Company0.80%
Government Pension Fund0.36%
Private Company0.18%
Insurance Company0.11%

Reported short interest has fallen from 6.26% to 5.38% of float over the last 6 biweekly reports (30 Jun 2026 to 15 Sep 2026).

Recent institutional activity

Holder	Type	Period	Share change	New stake
AE Industrial Partners, LP	VC/PE Fund	2026/Q3	+2,289,366	24.0%
Tokio Marine Asset Management Co., Ltd.	Mutual Fund	2026/Q3	+1,614,700	1.2%
Tema ETFs LLC	Mutual Fund	2026/Q3	+1,903,558	1.4%
Tidal Investments LLC	Mutual Fund	2026/Q3	+1,843,269	1.3%
Mirae Asset Global Investments Co., Ltd	Mutual Fund	2026/Q3	+1,361,373	1.0%
Westwood Management Corp.	Mutual Fund	2026/Q3	+1,327,720	1.3%
State Street Global Advisors	Mutual Fund	2026/Q3	+1,087,889	1.0%
Hood River Capital Management LLC	Mutual Fund	2026/Q3	+975,432	1.4%
Frontier Capital Management	Mutual Fund	2026/Q3	+733,025	0.5%
Penserra Capital Management LLC	Mutual Fund	2026/Q3	+641,961	0.5%
Temasek Holdings	VC/PE Fund	2026/Q3	+577,774	0.7%
Voya Investment Management LLC	Mutual Fund	2026/Q3	+540,708	1.2%
Systematic Financial Management LP	Mutual Fund	2026/Q3	+504,266	0.7%
UBS Asset Management	Mutual Fund	2026/Q3	+458,908	1.1%
Nissay Asset Management Corporation	Mutual Fund	2026/Q3	+345,127	0.3%

Institutional buy/sell activity by reporting period, largest moves first.

Insider transactions

Date	Insider	Title	Transaction	Shares	Price	Held after
6 Aug 2026	BlackRock		Open Market Disposition	-401,674	$11.60	16,517,115
4 Aug 2026	BlackRock		Private Disposition	-11,884	$15.28	16,918,789
4 Aug 2026	BlackRock		Open Market Disposition	-662,720	$15.58	16,918,789
2 Aug 2026	BlackRock		Open Market Disposition	-49,328	$15.14	17,593,393
29 Jul 2026	BlackRock		Open Market Disposition	-204,213	$15.31	17,642,721
7 Jul 2026	AE Industrial Partners, LP		Other Acquisition	+2,289,366	$34.00	31,102,522
3 Jun 2026	AE Industrial Partners, LP		Other Acquisition	+430,134	$34.00	28,813,156
9 Apr 2026	Janine Davidson	Director	Other Acquisition	+4,381	–	4,381
29 Jan 2026	BlackRock		Open Market Acquisition	+752,500	$34.00	–
29 Jan 2026	Brian Frantz	Chief Accounting Officer	Other Acquisition	+10,294	–	10,294
29 Jan 2026	Tamara Erwin		Other Acquisition	+5,294	–	5,294
29 Jan 2026	Tamara Erwin		Open Market Acquisition	+2,941	$34.00	74,690
29 Jan 2026	Kirk Konert	Chairperson	Other Acquisition	+5,294	–	5,294
29 Jan 2026	Dirk Wallinger	Founder, CEO & President	Other Acquisition	+211,176	–	211,176
29 Jan 2026	Kevin Messerle	Chief Financial Officer	Other Acquisition	+80,882	–	80,882
29 Jan 2026	Tyler Letarte	Director	Other Acquisition	+5,294	–	5,294
29 Jan 2026	Tyler Letarte	Director	Open Market Acquisition	+1,470	$34.00	1,470
29 Jan 2026	Louis Brothers	Independent Director	Other Acquisition	+5,294	–	5,294
29 Jan 2026	Devjyoti Rudra	Chief Supply Chain Officer	Other Acquisition	+23,529	–	23,529
29 Jan 2026	Andrew Boyd	Independent Director	Other Acquisition	+5,294	–	5,294

From Form 4/Form 144 filings. Negative share counts are disposals (sales, gifts, or shares withheld for taxes); positive are acquisitions.

Short interest, by report

Report date	Shares short	% of float	Days to cover
15 Sep 2026	7,384,125	5.4%	2.6
31 Aug 2026	7,841,749	5.7%	2.4
14 Aug 2026	6,026,103	4.7%	1.5
31 Jul 2026	8,332,309	6.4%	5.8
15 Jul 2026	8,476,256	6.5%	8.1
30 Jun 2026	8,118,528	6.3%	4.7

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