York Space Systems Inc. (YSS)

Data as of Aug 10, 2026, from SEC Form 4 filings.

Net insider selling (90d)Watch YSS

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Latest YSS insider trades

BlackRock Portfolio Management LLC - 10% Owner
Open-market sale$1.17M
Aug 4, 2026
BlackRock Portfolio Management LLC - 10% Owner
Open-market sale$7.30M
Aug 4, 2026

About York Space Systems Inc. (YSS)

York Space Systems Inc. files with the SEC under CIK 0002086587 and is classified as guided missiles and space vehicles and parts. We track it alongside the rest of the Industrials sector. Its offering priced on 30 January 2026 and it trades on NASDAQ.

Sector: Industrials

SEC filings for YSS on EDGAR

YSS Form 4 activity by transaction type, last 90 days

Form 4 transaction type	Transactions	Shares	Total value
Open-market sale	12	1,590,144	$24.10M

YSS insider transactions (Form 4)

21 Form 4 filings on record, the earliest from Feb 3, 2026, newest first.

Date	Insider	Transaction	Security	Shares	Price	Value
Aug 4, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	78,082	$15.02^{footnote F4}	$1.17M
Aug 4, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	468,476	$15.58^{footnote F5}	$7.30M
Aug 5, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	116,162	$13.49	$1.57M
Aug 5, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	11,884	$15.28^{footnote F6}	$182K
Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.28 to $15.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $16.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR Footnote F6 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Aug 4, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	77,743	$15.02^{footnote F4}	$1.17M
Aug 4, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	456,310	$15.58^{footnote F5}	$7.11M
Aug 5, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	116,162	$13.49	$1.57M
Aug 5, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	11,784	$15.28^{footnote F6}	$180K
Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.28 to $15.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $16.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR Footnote F6 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Jul 31, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	35,574	$15.14^{footnote F4}	$539K
Aug 3, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	13,754	$15.03^{footnote F5}	$207K
Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.65, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.14, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Jul 29, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	63,390	$15.31^{footnote F4}	$971K
Jul 30, 2026	BlackRock Portfolio Management LLC - 10% Owner	Open-market sale	Common Stock	140,823	$15.18^{footnote F5}	$2.14M
Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.27 to $16.07, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.65, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Jul 8, 2026	AEROEQUITY GP, LLC - 10% Owner	Grant or award	Common Stock, par value $0.0001 per share	2,289,366	$34.00	$77.84M
Jun 4, 2026	AEROEQUITY GP, LLC - 10% Owner	Grant or award	Common Stock, par value $0.0001 per share	430,134	$34.00	$14.62M
Jun 4, 2026	AEROEQUITY GP, LLC - 10% Owner	Grant or award	Common Stock, par value $0.0001 per share	287,789	$34.00	$9.78M
Apr 10, 2026	Janine Davidson	Grant or award	Common Stock	4,381^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest in full on January 30, 2027.
Jan 30, 2026	Dirk Wallinger - Officer	Grant or award	Common Stock	211,176	$0.00	-
Jan 30, 2026	Brian D. Frantz - Officer	Grant or award	Common Stock	10,294^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest over three years.
Jan 30, 2026	Tami A. Erwin	Grant or award	Common Stock	5,294^{footnote F1}	$0.00	-
Jan 30, 2026	Tami A. Erwin	Open-market purchase	Common Stock	2,941	$34.00^{footnote F2}	$100K
Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date. Footnote F2 (price): Represents the price to the public in the issuer's initial public offering.
Jan 30, 2026	Kevin Messerle - Officer	Grant or award	Common Stock	80,882^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest over three years.
Jan 30, 2026	Kirk Michael Konert	Grant or award	Common Stock	5,294^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.
Jan 30, 2026	James McConville	Grant or award	Common Stock	5,294^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.
Jan 30, 2026	Dirk Wallinger - Officer	Grant or award	Common Stock	569,920^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest over three years.
Jan 30, 2026	Tyler Letarte	Grant or award	Common Stock	5,294^{footnote F1}	$0.00	-
Jan 30, 2026	Tyler Letarte	Open-market purchase	Common Stock	1,470^{footnote F2}	$34.00	$50K
Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date. Footnote F2 (shares): Represents the price to the public in the issuer's initial public offering.
Jan 30, 2026	Andrew Boyd	Grant or award	Common Stock	5,294^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.
Jan 30, 2026	Louis R. Brothers Jr.	Grant or award	Common Stock	5,294^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.
Jan 30, 2026	Monica J. Palko - Officer	Grant or award	Common Stock	54,412^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest over three years.
Jan 30, 2026	Devjyoti Rudra - Officer	Grant or award	Common Stock	23,529^{footnote F1}	$0.00	-
Footnote F1 (shares): Represents restricted stock units which vest over three years.
Jan 30, 2026	BlackRock Portfolio Management LLC	Open-market purchase	Common Stock	752,500	$34.00	$25.59M

Recent YSS Form 8-K filings

Read YSS company news

Aug 13, 2026Item 2.02, 9.01

Read the filing on SEC EDGAR

Aug 5, 2026Item 5.02, 7.01, 9.01

Read the filing on SEC EDGAR

Jun 4, 2026Item 3.02

Read the filing on SEC EDGAR

May 19, 2026Item 3.02

Read the filing on SEC EDGAR

YSS insider trading FAQ

What is the latest insider trade for YSS?

York Space Systems Inc. (YSS) had 4 insider filings in the last 90 days, with the most recent on 2026-08-10. The full record for YSS runs to 21 Form 4 filings, the earliest from 2026-02-03. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.

How many insiders are buying YSS stock?

No insider purchases of YSS were filed in the last 90 days. 3 purchases are on record for this company.

How many insiders are selling YSS stock?

12 insider sales of YSS were filed in the last 90 days, totaling $24.10M.

Where can I see YSS SEC filings (Form 4, 10-K, 10-Q, 8-K)?

This page collects YSS Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.

More Industrials companies with insider activity

Recent insider filings

The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.

Aug 10, 2026 - BlackRock Portfolio Management LLC view on EDGAR
Aug 6, 2026 - BlackRock Portfolio Management LLC view on EDGAR
Aug 4, 2026 - BlackRock Portfolio Management LLC view on EDGAR
Jul 31, 2026 - BlackRock Portfolio Management LLC view on EDGAR
Jul 10, 2026 - AEROEQUITY GP, LLC view on EDGAR
Jun 29, 2026 - AEROEQUITY GP, LLC view on EDGAR
Jun 5, 2026 - AEROEQUITY GP, LLC view on EDGAR
Apr 14, 2026 - Janine Davidson view on EDGAR
Mar 11, 2026 - Dirk Wallinger view on EDGAR

Related companies with recent insider activity

Learn more

Insider selling: signal or noise?: Why most insider sales are routine, and the few patterns worth a second look.
Insider activity in Industrials: Where YSS's peers are being bought and sold.
Every recent Form 4: The market-wide feed, updated as filings arrive from SEC EDGAR.

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Form 4 transaction type

Transactions

Total value

Open-market sale

1,590,144

$24.10M

Date

Insider

Transaction

Security

Price

Value

Aug 4, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

78,082

$15.02^{footnote F4}

$1.17M

Aug 4, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

468,476

$15.58^{footnote F5}

$7.30M

Aug 5, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

116,162

$13.49

$1.57M

Aug 5, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

11,884

$15.28^{footnote F6}

$182K

Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.28 to $15.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $16.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Footnote F6 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR

Aug 4, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

77,743

$15.02^{footnote F4}

$1.17M

Aug 4, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

456,310

$15.58^{footnote F5}

$7.11M

Aug 5, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

116,162

$13.49

$1.57M

Aug 5, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

11,784

$15.28^{footnote F6}

$180K

Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.28 to $15.27, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.28 to $16.00, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Footnote F6 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR

Jul 31, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

35,574

$15.14^{footnote F4}

$539K

Aug 3, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

13,754

$15.03^{footnote F5}

$207K

Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.65, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.14, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR

Jul 29, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

63,390

$15.31^{footnote F4}

$971K

Jul 30, 2026

BlackRock Portfolio Management LLC - 10% Owner

Open-market sale

Common Stock

140,823

$15.18^{footnote F5}

$2.14M

Footnote F4 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.27 to $16.07, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR
Footnote F5 (price): The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.00 to $15.65, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the… Full note on SEC EDGAR

Jul 8, 2026

AEROEQUITY GP, LLC - 10% Owner

Grant or award

Common Stock, par value $0.0001 per share

2,289,366

$34.00

$77.84M

Jun 4, 2026

AEROEQUITY GP, LLC - 10% Owner

Grant or award

Common Stock, par value $0.0001 per share

430,134

$34.00

$14.62M

Jun 4, 2026

AEROEQUITY GP, LLC - 10% Owner

Grant or award

Common Stock, par value $0.0001 per share

287,789

$34.00

$9.78M

Apr 10, 2026

Janine Davidson

Grant or award

Common Stock

4,381^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest in full on January 30, 2027.

Jan 30, 2026

Dirk Wallinger - Officer

Grant or award

Common Stock

211,176

$0.00

Jan 30, 2026

Brian D. Frantz - Officer

Grant or award

Common Stock

10,294^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest over three years.

Jan 30, 2026

Tami A. Erwin

Grant or award

Common Stock

5,294^{footnote F1}

$0.00

Jan 30, 2026

Tami A. Erwin

Open-market purchase

Common Stock

2,941

$34.00^{footnote F2}

$100K

Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.
Footnote F2 (price): Represents the price to the public in the issuer's initial public offering.

Jan 30, 2026

Kevin Messerle - Officer

Grant or award

Common Stock

80,882^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest over three years.

Jan 30, 2026

Kirk Michael Konert

Grant or award

Common Stock

5,294^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.

Jan 30, 2026

James McConville

Grant or award

Common Stock

5,294^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.

Jan 30, 2026

Dirk Wallinger - Officer

Grant or award

Common Stock

569,920^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest over three years.

Jan 30, 2026

Tyler Letarte

Grant or award

Common Stock

5,294^{footnote F1}

$0.00

Jan 30, 2026

Tyler Letarte

Open-market purchase

Common Stock

1,470^{footnote F2}

$34.00

$50K

Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.
Footnote F2 (shares): Represents the price to the public in the issuer's initial public offering.

Jan 30, 2026

Andrew Boyd

Grant or award

Common Stock

5,294^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.

Jan 30, 2026

Louis R. Brothers Jr.

Grant or award

Common Stock

5,294^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest on the first anniversary of the grant date.

Jan 30, 2026

Monica J. Palko - Officer

Grant or award

Common Stock

54,412^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest over three years.

Jan 30, 2026

Devjyoti Rudra - Officer

Grant or award

Common Stock

23,529^{footnote F1}

$0.00

Footnote F1 (shares): Represents restricted stock units which vest over three years.

Jan 30, 2026

BlackRock Portfolio Management LLC

Open-market purchase

Common Stock

752,500

$34.00

$25.59M