York Space Systems Inc. SEC filings YSS
York Space Systems Inc. has 73 filings in SEC EDGAR's recent list, going back to Sep 29, 2025. Its latest annual report, Form 10-K, was filed on Mar 20, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 14, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 13, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SCHEDULE 13G | Ownership over 5% (passive) | Oct 27, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| 10-Q | Quarterly report | Aug 14, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 13, 2026 | Aug 13, 2026 |
| 4 | Insider transaction | Aug 10, 2026 | Aug 6, 2026 |
| 4/A | Primary document | Aug 10, 2026 | Aug 4, 2026 |
| 4 | Insider transaction | Aug 6, 2026 | Aug 4, 2026 |
| 8-K |
Current report
Officer or director change, Regulation FD disclosure
|
Aug 5, 2026 | Jul 30, 2026 |
| 4 | Insider transaction | Aug 4, 2026 | Jul 31, 2026 |
| 4 | Insider transaction | Jul 31, 2026 | Jul 29, 2026 |
| 4 | Insider transaction | Jul 10, 2026 | Jul 8, 2026 |
| 4/A | Ownership document | Jun 29, 2026 | Jun 4, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 4, 2026 |
| 8-K/A |
Amended current report
Unregistered share sale
|
Jun 4, 2026 | May 15, 2026 |
| 8-K |
Current report
Unregistered share sale
|
May 19, 2026 | May 15, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| 10-Q | Quarterly report | May 15, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 14, 2026 | May 14, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Apr 29, 2026 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale
|
Apr 29, 2026 | Apr 29, 2026 |
| 4 | Insider transaction | Apr 14, 2026 | Apr 10, 2026 |
| 3 | Initial insider ownership | Apr 14, 2026 | Apr 10, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 14, 2026 | Apr 10, 2026 |
| 10-K | Annual report | Mar 20, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 19, 2026 | Mar 19, 2026 |
| 4/A | Filing | Mar 11, 2026 | Jan 30, 2026 |
| 8-K |
Current report
Unregistered share sale
|
Mar 10, 2026 | Mar 6, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| 3 | Initial insider ownership | Feb 3, 2026 | Jan 29, 2026 |
| 4 | Insider transaction | Feb 3, 2026 | Jan 30, 2026 |
| S-8 | Employee stock plan registration | Jan 30, 2026 | — |
| 8-K |
Current report
Material agreement, Change to shareholder rights, Officer or director change, Bylaw or fiscal year change
|
Jan 30, 2026 | Jan 28, 2026 |
| 424B4 | Prospectus | Jan 30, 2026 | — |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| 3 | Initial insider ownership | Jan 29, 2026 | Jan 29, 2026 |
| CERT | Nyse certification | Jan 29, 2026 | — |
| 8-A12B | Filing | Jan 29, 2026 | — |
| EFFECT | Filing | Jan 28, 2026 | — |
| S-1MEF | Filing | Jan 28, 2026 | — |
| UPLOAD | Letter from the SEC | Jan 27, 2026 | — |
| CORRESP | Letter to the SEC | Jan 26, 2026 | — |
| CORRESP | Letter to the SEC | Jan 26, 2026 | — |
| CORRESP | Letter to the SEC | Jan 26, 2026 | — |
| S-1/A | Amended registration statement | Jan 26, 2026 | — |
| CORRESP | Letter to the SEC | Jan 16, 2026 | — |
| S-1/A | Amended registration statement | Jan 16, 2026 | — |
| UPLOAD | Letter from the SEC | Jan 13, 2026 | — |
| CORRESP | Letter to the SEC | Dec 15, 2025 | — |
| S-1/A | Amended registration statement | Dec 15, 2025 | — |
| UPLOAD | Letter from the SEC | Dec 8, 2025 | — |
| S-1 | Registration statement | Nov 17, 2025 | — |
| DRS | Filing | Sep 29, 2025 | — |
Showing 73 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
New to this? Read What Are SEC Filings? 10-K, 10-Q, 8-K and Other Forms Explained.
Company profile
- Industry
- Guided Missiles & Space Vehicles & Parts (SIC 3760)
- Listed as
- YSS (NYSE)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Greenwood Village, CO
- SEC filer status
- Non-accelerated filer, Emerging growth company
- SEC CIK
- 2086587
- Former names
- Yellowstone Midco Holdings II, LLC (until Feb 3, 2026)
Other Guided Missiles & Space Vehicles & Parts companies
Source: SEC EDGAR filings. This is company-reported data, not investment advice.