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 | — |
| 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 |
| 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 | — |
| 4 | Insider transaction | Apr 16, 2026 | Apr 15, 2026 |
| 3 | Initial insider ownership | Apr 16, 2026 | Apr 15, 2026 |
| 4 | Insider transaction | Mar 30, 2026 | Mar 26, 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 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 12, 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 |
| SCHEDULE 13G | Ownership over 5% (passive) | Dec 11, 2025 | — |
| 4 | Insider transaction | Dec 1, 2025 | Nov 26, 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 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G | Ownership over 5% (passive) | Nov 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Aug 14, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | 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 |
| 4 | Insider transaction | Jun 6, 2025 | Jun 5, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 15, 2025 | — |
| 4 | Insider transaction | Apr 16, 2025 | Apr 15, 2025 |
| 4 | Insider transaction | Apr 16, 2025 | Apr 15, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 18, 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 | — |
| 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 | — |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 | — |
| 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 |
| 4 | Insider transaction | Sep 7, 2023 | Sep 5, 2023 |
| 3 | Initial insider ownership | Sep 7, 2023 | Sep 5, 2023 |
| 4 | Insider transaction | Aug 18, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 18, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 18, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 18, 2023 | Aug 16, 2023 |
| 4 | Insider transaction | Aug 7, 2023 | Aug 3, 2023 |
| 3 | Initial insider ownership | Aug 7, 2023 | Aug 3, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 12, 2023 |
| 4 | Insider transaction | Jun 13, 2023 | Jun 12, 2023 |
| SC 13G | Ownership over 5% (passive) | Apr 10, 2023 | — |
| 4 | Insider transaction | Apr 3, 2023 | Apr 1, 2023 |
| 3 | Initial insider ownership | Apr 3, 2023 | Mar 30, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2023 | — |
| SC 13G | Ownership over 5% (passive) | Jan 25, 2023 | — |
| 4 | Insider transaction | Jan 4, 2023 | Jan 1, 2023 |
| 4 | Insider transaction | Jan 4, 2023 | Jan 1, 2023 |
| 4 | Insider transaction | Jan 4, 2023 | Jan 1, 2023 |
| SC 13G/A | Amended ownership over 5% (passive) | Dec 29, 2022 | — |
| 3 | Initial insider ownership | Nov 16, 2022 | Nov 9, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 14, 2022 | — |
| 3 | Initial insider ownership | Sep 16, 2022 | Sep 15, 2022 |
| 4 | Insider transaction | Sep 16, 2022 | Sep 15, 2022 |
| 4/A | Filing | Jun 23, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Jun 17, 2022 | Jun 15, 2022 |
| 3 | Initial insider ownership | Jun 17, 2022 | Jun 15, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 22, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 22, 2022 |
| 4 | Insider transaction | Feb 24, 2022 | Feb 22, 2022 |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 14, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 11, 2022 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Feb 9, 2022 | — |
| SC 13G | Ownership over 5% (passive) | Jan 14, 2022 | — |
| 4 | Insider transaction | Jan 6, 2022 | Jan 4, 2022 |
| 3 | Initial insider ownership | Jan 6, 2022 | Jan 4, 2022 |
| 4/A | Filing | Jan 4, 2022 | Dec 22, 2021 |
| 4 | Insider transaction | Dec 23, 2021 | Dec 22, 2021 |
| 4 | Insider transaction | Dec 10, 2021 | Dec 8, 2021 |
| 3 | Initial insider ownership | Nov 5, 2021 | Oct 26, 2021 |
| SC 13G | Ownership over 5% (passive) | Nov 5, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Nov 5, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Nov 5, 2021 | — |
| SC 13D | Ownership over 5% (active) | Nov 5, 2021 | — |
| SC 13G | Ownership over 5% (passive) | Nov 4, 2021 | — |
| 4/A | Form 4/a submission | Nov 3, 2021 | Oct 26, 2021 |
| SC 13D | Ownership over 5% (active) | Nov 3, 2021 | — |
| 4 | Insider transaction | Oct 28, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 28, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 28, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 28, 2021 | Oct 26, 2021 |
| SC 13G | Ownership over 5% (passive) | Oct 27, 2021 | — |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 26, 2021 | Oct 26, 2021 |
| 4 | Insider transaction | Oct 25, 2021 | Oct 21, 2021 |
| 4 | Insider transaction | Oct 25, 2021 | Oct 21, 2021 |
| 4 | Insider transaction | Oct 25, 2021 | Oct 21, 2021 |
| 4 | Insider transaction | Oct 25, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 22, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
| 3 | Initial insider ownership | Oct 21, 2021 | Oct 21, 2021 |
Showing 197 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.
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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.