Xilio Therapeutics, Inc. SEC filings XLO
Xilio Therapeutics, Inc. has 357 filings in SEC EDGAR's recent list, going back to Jan 21, 2021. Its latest annual report, Form ARS, was filed on Apr 28, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 12, 2026, covering the quarter ended Jun 30, 2026. The most recent current report (Form 8-K) was filed on Aug 12, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 2, 2026 | Oct 1, 2026 |
| 3 | Initial insider ownership | Oct 2, 2026 | Sep 28, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2026 | — |
| S-8 | Employee stock plan registration | Aug 12, 2026 | — |
| 10-Q | Quarterly report | Aug 12, 2026 | Jun 30, 2026 |
| 8-K |
Current report
Results of operations
|
Aug 12, 2026 | Aug 12, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 12, 2026 | Jun 11, 2026 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Jun 12, 2026 | Jun 10, 2026 |
| EFFECT | Filing | May 29, 2026 | — |
| CORRESP | Letter to the SEC | May 27, 2026 | — |
| S-3/A | Filing | May 27, 2026 | — |
| UPLOAD | Letter from the SEC | May 18, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2026 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | May 15, 2026 | — |
| S-3 | Shelf registration | May 12, 2026 | — |
| 10-Q | Quarterly report | May 12, 2026 | Mar 31, 2026 |
| 8-K |
Current report
Results of operations
|
May 12, 2026 | May 12, 2026 |
| ARS | Annual report to shareholders | Apr 28, 2026 | Dec 31, 2025 |
| DEF 14A | Proxy statement | Apr 28, 2026 | Jun 10, 2026 |
| 4 | Insider transaction | Apr 16, 2026 | Apr 15, 2026 |
| 3 | Initial insider ownership | Apr 16, 2026 | Apr 15, 2026 |
| 8-K |
Current report
Officer or director change
|
Apr 16, 2026 | Apr 15, 2026 |
| 4 | Insider transaction | Mar 30, 2026 | Mar 26, 2026 |
| S-8 | Employee stock plan registration | Mar 23, 2026 | — |
| 10-K | Annual report | Mar 23, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Results of operations
|
Mar 23, 2026 | Mar 23, 2026 |
| 8-K |
Current report
Change to shareholder rights, Bylaw or fiscal year change
|
Mar 12, 2026 | Mar 12, 2026 |
| 8-K |
Current report
Regulation FD disclosure
|
Mar 9, 2026 | Mar 9, 2026 |
| 8-K |
Current report
Shareholder vote results
|
Feb 24, 2026 | Feb 23, 2026 |
| 4 | Insider transaction | Feb 17, 2026 | Feb 13, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 17, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 13, 2026 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure
|
Feb 12, 2026 | Feb 11, 2026 |
| 424B5 | Prospectus supplement | Feb 12, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 2026 | — |
| 424B5 | Prospectus supplement | Feb 11, 2026 | — |
| DEF 14A | Proxy statement | Jan 26, 2026 | Feb 23, 2026 |
| PRE 14A | Preliminary proxy statement | Jan 16, 2026 | Jan 16, 2026 |
| 8-K |
Current report
Results of operations, Officer or director change
|
Jan 8, 2026 | Jan 6, 2026 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 4 | Insider transaction | Jan 5, 2026 | Dec 31, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Jan 5, 2026 | Jan 5, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 11, 2025 | — |
| 4 | Insider transaction | Dec 1, 2025 | Nov 26, 2025 |
| S-8 | Employee stock plan registration | Nov 25, 2025 | — |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 4 | Insider transaction | Nov 25, 2025 | Nov 21, 2025 |
| 8-K |
Current report
Officer or director change, Shareholder vote results
|
Nov 25, 2025 | Nov 21, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 14, 2025 | — |
| 10-Q | Quarterly report | Nov 13, 2025 | Sep 30, 2025 |
| 8-K |
Current report
Results of operations
|
Nov 13, 2025 | Nov 13, 2025 |
| 8-K |
Current report
Regulation FD disclosure
|
Nov 7, 2025 | Nov 7, 2025 |
| DEF 14A | Proxy statement | Oct 20, 2025 | Nov 21, 2025 |
| PRE 14A | Preliminary proxy statement | Oct 10, 2025 | Nov 21, 2025 |
| 8-K |
Current report
Listing notice
|
Oct 3, 2025 | Oct 2, 2025 |
| 8-K |
Current report
Other events
|
Sep 9, 2025 | Sep 9, 2025 |
| 8-K |
Current report
Listing notice
|
Aug 28, 2025 | Aug 22, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| 10-Q | Quarterly report | Aug 14, 2025 | Jun 30, 2025 |
| 8-K |
Current report
Results of operations
|
Aug 14, 2025 | Aug 14, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| 4 | Insider transaction | Jun 18, 2025 | Jun 16, 2025 |
| 4/A | Filing | Jun 18, 2025 | Jan 1, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 17, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 12, 2025 | — |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 11, 2025 |
| 4 | Insider transaction | Jun 12, 2025 | Jun 10, 2025 |
| 3 | Initial insider ownership | Jun 12, 2025 | Jun 10, 2025 |
| 8-K |
Current report
Shareholder vote results
|
Jun 12, 2025 | Jun 10, 2025 |
| 8-K |
Current report
Officer or director change
|
Jun 10, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 5, 2025 |
| DEFA14A | Additional proxy material | Jun 3, 2025 | — |
| 8-K |
Current report
Material agreement, Regulation FD disclosure, Other events
|
Jun 3, 2025 | Jun 2, 2025 |
| 424B5 | Prospectus supplement | Jun 3, 2025 | — |
| 424B5 | Prospectus supplement | Jun 2, 2025 | — |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jun 2, 2025 | May 31, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| EFFECT | Filing | May 8, 2025 | — |
| 10-Q | Quarterly report | May 8, 2025 | Mar 31, 2025 |
| 8-K |
Current report
Results of operations
|
May 8, 2025 | May 8, 2025 |
| CORRESP | Letter to the SEC | May 6, 2025 | — |
| S-3/A | Filing | May 6, 2025 | — |
| ARS | Annual report to shareholders | Apr 28, 2025 | Dec 31, 2024 |
| DEFA14A | Additional proxy material | Apr 28, 2025 | — |
| DEF 14A | Proxy statement | Apr 28, 2025 | Jun 10, 2025 |
| PRE 14A | Preliminary proxy statement | Apr 18, 2025 | Jun 10, 2025 |
| 4 | Insider transaction | Apr 16, 2025 | Apr 15, 2025 |
| 4 | Insider transaction | Apr 16, 2025 | Apr 15, 2025 |
| 8-K |
Current report
Listing notice
|
Apr 8, 2025 | Apr 4, 2025 |
| UPLOAD | Letter from the SEC | Mar 17, 2025 | — |
| S-3 | Shelf registration | Mar 11, 2025 | — |
| 8-K |
Current report
Material agreement
|
Mar 11, 2025 | Mar 11, 2025 |
| 424B5 | Prospectus supplement | Mar 11, 2025 | — |
| S-8 | Employee stock plan registration | Mar 11, 2025 | — |
| 10-K | Annual report | Mar 11, 2025 | Dec 31, 2024 |
| 8-K |
Current report
Results of operations
|
Mar 11, 2025 | Mar 11, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 18, 2025 | — |
| 8-K |
Current report
Material agreement, Unregistered share sale, Regulation FD disclosure, Other events
|
Feb 12, 2025 | Feb 10, 2025 |
| 8-K |
Current report
Regulation FD disclosure, Other events
|
Jan 21, 2025 | Jan 21, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 1, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 1, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 1, 2025 |
| 4 | Insider transaction | Jan 3, 2025 | Jan 1, 2025 |
| 4 | Insider transaction | Dec 19, 2024 | Dec 18, 2024 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Dec 19, 2024 | — |
| 8-K |
Current report
Unregistered share sale, Regulation FD disclosure, Other events
|
Dec 19, 2024 | Dec 18, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| 10-Q | Quarterly report | Nov 7, 2024 | Sep 30, 2024 |
| 8-K |
Current report
Results of operations, Regulation FD disclosure, Other events
|
Nov 7, 2024 | Nov 7, 2024 |
| 4 | Insider transaction | Oct 2, 2024 | Oct 1, 2024 |
| SC 13G | Ownership over 5% (passive) | Sep 27, 2024 | — |
| 3 | Initial insider ownership | Sep 27, 2024 | Jun 7, 2024 |
| 8-K |
Current report
Listing notice
|
Sep 13, 2024 | Sep 10, 2024 |
| 10-Q | Quarterly report | Aug 8, 2024 | Jun 30, 2024 |
| 8-K |
Current report
Results of operations
|
Aug 8, 2024 | Aug 8, 2024 |
| 4 | Insider transaction | Aug 6, 2024 | Aug 3, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Jul 31, 2024 | — |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 14, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 13, 2024 |
| 3 | Initial insider ownership | Jun 17, 2024 | Jun 13, 2024 |
| 4 | Insider transaction | Jun 17, 2024 | Jun 13, 2024 |
| 3 | Initial insider ownership | Jun 17, 2024 | Jun 13, 2024 |
| 8-K |
Current report
Shareholder vote results
|
Jun 17, 2024 | Jun 13, 2024 |
| 8-K |
Current report
Officer or director change
|
Jun 13, 2024 | Jun 13, 2024 |
| 10-Q | Quarterly report | May 14, 2024 | Mar 31, 2024 |
| 8-K |
Current report
Results of operations
|
May 14, 2024 | May 14, 2024 |
| EFFECT | Filing | May 6, 2024 | — |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| 4 | Insider transaction | May 3, 2024 | May 1, 2024 |
| CORRESP | Letter to the SEC | May 2, 2024 | — |
| UPLOAD | Letter from the SEC | May 2, 2024 | — |
| S-3 | Shelf registration | Apr 30, 2024 | — |
| ARS | Annual report to shareholders | Apr 25, 2024 | Dec 31, 2023 |
| DEFA14A | Additional proxy material | Apr 25, 2024 | — |
| DEF 14A | Proxy statement | Apr 25, 2024 | Jun 13, 2024 |
| 424B5 | Prospectus supplement | Apr 15, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Apr 5, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Apr 5, 2024 | — |
| 4 | Insider transaction | Apr 3, 2024 | Apr 2, 2024 |
| 3 | Initial insider ownership | Apr 3, 2024 | Mar 27, 2024 |
| S-8 | Employee stock plan registration | Apr 1, 2024 | — |
| 10-K | Annual report | Apr 1, 2024 | Dec 31, 2023 |
| 8-K |
Current report
Results of operations
|
Apr 1, 2024 | Apr 1, 2024 |
| 8-K |
Current report
Other events
|
Mar 28, 2024 | Mar 28, 2024 |
| 8-K |
Current report
Material agreement, Results of operations, Exit or restructuring costs, Unregistered share sale, Regulation FD disclosure, Other events
|
Mar 28, 2024 | Mar 27, 2024 |
| SC 13G | Ownership over 5% (passive) | Feb 14, 2024 | — |
| 4 | Insider transaction | Feb 9, 2024 | Feb 8, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 6, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 5, 2024 | — |
| 8-K |
Current report
Listing notice
|
Jan 19, 2024 | Jan 19, 2024 |
| 4 | Insider transaction | Jan 16, 2024 | Jan 11, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 1, 2024 |
| 4 | Insider transaction | Jan 3, 2024 | Jan 1, 2024 |
| 8-K |
Current report
Officer or director change
|
Jan 3, 2024 | Jan 1, 2024 |
| 8-K |
Current report
Other events
|
Dec 7, 2023 | Dec 7, 2023 |
| 10-Q | Quarterly report | Nov 9, 2023 | Sep 30, 2023 |
| 8-K |
Current report
Results of operations
|
Nov 9, 2023 | Nov 9, 2023 |
| 10-Q/A | Amended quarterly report | Nov 9, 2023 | Jun 30, 2023 |
| 10-Q/A | Amended quarterly report | Nov 9, 2023 | Mar 31, 2023 |
| 10-K/A | Amended annual report | Nov 9, 2023 | Dec 31, 2022 |
| 8-K |
Current report
Other events
|
Nov 3, 2023 | Nov 3, 2023 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 3 | Initial insider ownership | Sep 7, 2023 | Sep 5, 2023 |
| 8-K |
Current report
Officer or director change, Other events
|
Sep 5, 2023 | Aug 30, 2023 |
| 4 | Insider transaction | Aug 18, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 18, 2023 | Aug 16, 2023 |
Showing 200 filings, the most recent 200. 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.
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Company profile
- Industry
- Pharmaceutical Preparations (SIC 2834)
- Listed as
- XLO (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- DE
- Headquarters
- Waltham, MA
- SEC filer status
- Non-accelerated filer, Smaller reporting company, Emerging growth company
- SEC CIK
- 1840233
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.