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On October 8, 2025, the Compensation Committee of the Board granted these options (referred to as \"Tranche 3 Options\" in the 2025 Plan) to the Reporting Person, subject to stockholder approval of the adoption of the 2025 Plan. The stockholders approved the adoption of the 2025 Plan on November 21, 2025. On December 31, 2025, the performance criteria for a portion of the Tranche 3 Options was met."},{"field":"shares","element":"transactionShares","label":"F4","text":"The portion of Tranche 3 Options that achieved the vesting condition s equal to the percentage of the Series B Warrants exercised and/or cancelled due to the receipt by Xilio Therapeutics, Inc. of Non-Dilutive Capital (as defined in the Series B Warrants) by December 31, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"This option vests in three (3) equal annual installments over the three-year period beginning on December 31, 2025, subject to the Reporting Person's continued service to the registrant through each applicable vesting date."}],"balance_after":95221,"derivative":{"exercise_price":0.841,"expiration_date":"2035-10-07","underlying":"Common Stock","underlying_shares":95221},"source":{"system":"sec-edgar","filing":"0001193125-26-002518","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1840233/000119312526002518/ownership.xml","form_type":"4"}},{"id":949730,"issuer":{"id":7122,"kind":"organization","name":"Xilio Therapeutics, Inc."},"owners":[{"id":70235,"kind":"person","name":"Brennan Kevin M.","position":1,"cik":"0001971303","reported_name":"Brennan Kevin M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, FINANCE AND ACCOUNTING"}}],"security":"Common Stock","published_at":"2026-01-05T21:30:23.000Z","date":"2026-01-02","kind":"sale","planned":true,"acquired":false,"shares":1826,"price":0.6432,"value":1174.4832,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The reported sale of 1,826 shares occurred automatically in a \"sell to cover\" transaction pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on April 8, 2024 solely to cover tax withholding obligations in connection with the vesting of restricted stock units."}],"balance_after":6371,"source":{"system":"sec-edgar","filing":"0001193125-26-002518","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1840233/000119312526002518/ownership.xml","form_type":"4"}},{"id":949729,"issuer":{"id":7122,"kind":"organization","name":"Xilio Therapeutics, Inc."},"owners":[{"id":70235,"kind":"person","name":"Brennan Kevin M.","position":1,"cik":"0001971303","reported_name":"Brennan Kevin M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, FINANCE AND ACCOUNTING"}}],"security":"Common Stock","published_at":"2026-01-05T21:30:23.000Z","date":"2026-01-01","kind":"exercise","planned":true,"acquired":true,"shares":5000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Restricted stock units (\"RSUs\") convert to stock on a one-for-one basis."}],"balance_after":8197,"source":{"system":"sec-edgar","filing":"0001193125-26-002518","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1840233/000119312526002518/ownership.xml","form_type":"4"}},{"id":988292,"issuer":{"id":7122,"kind":"organization","name":"Xilio Therapeutics, Inc."},"owners":[{"id":70235,"kind":"person","name":"Brennan Kevin M.","position":1,"cik":"0001971303","reported_name":"Brennan Kevin M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, FINANCE AND ACCOUNTING"}}],"security":"Stock Option (right to buy)","published_at":"2025-11-25T21:10:06.000Z","date":"2025-11-21","kind":"grant","planned":false,"acquired":true,"shares":20000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The transactions reported herein reflect a one-time option repricing, effective on November 21, 2025, which reduced the exercise price of each repriced option to $1.00 per share unless such repriced stock option is exercised prior to November 21, 2026, in which case the original exercise price must be paid (the \"Option Repricing\"). Except as modified by the Option Repricing, all other terms and conditions of the repriced options, including, without limitation, any provisions with respect to vesting and expiration, remain in full force and effect."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"This option was granted on May 1, 2024. The shares underlying the option began vesting on June 1, 2024 and continue to vest in equal monthly installments thereafter through May 1, 2028."}],"balance_after":20000,"derivative":{"exercise_price":1,"expiration_date":"2034-04-30","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001193125-25-297207","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1840233/000119312525297207/ownership.xml","form_type":"4"}},{"id":988291,"issuer":{"id":7122,"kind":"organization","name":"Xilio Therapeutics, Inc."},"owners":[{"id":70235,"kind":"person","name":"Brennan Kevin M.","position":1,"cik":"0001971303","reported_name":"Brennan Kevin M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, FINANCE AND ACCOUNTING"}}],"security":"Stock Option (right to buy)","published_at":"2025-11-25T21:10:06.000Z","date":"2025-11-21","kind":"disposition_to_issuer","planned":false,"acquired":false,"shares":20000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The transactions reported herein reflect a one-time option repricing, effective on November 21, 2025, which reduced the exercise price of each repriced option to $1.00 per share unless such repriced stock option is exercised prior to November 21, 2026, in which case the original exercise price must be paid (the \"Option Repricing\"). 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The shares underlying the option began vesting on June 1, 2024 and continue to vest in equal monthly installments thereafter through May 1, 2028."}],"balance_after":0,"derivative":{"exercise_price":1.08,"expiration_date":"2034-04-30","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001193125-25-297207","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1840233/000119312525297207/ownership.xml","form_type":"4"}},{"id":988290,"issuer":{"id":7122,"kind":"organization","name":"Xilio Therapeutics, Inc."},"owners":[{"id":70235,"kind":"person","name":"Brennan Kevin M.","position":1,"cik":"0001971303","reported_name":"Brennan Kevin M.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"SVP, FINANCE AND ACCOUNTING"}}],"security":"Stock Option (right to buy)","published_at":"2025-11-25T21:10:06.000Z","date":"2025-11-21","kind":"grant","planned":false,"acquired":true,"shares":25000,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The transactions reported herein reflect a one-time option repricing, effective on November 21, 2025, which reduced the exercise price of each repriced option to $1.00 per share unless such repriced stock option is exercised prior to November 21, 2026, in which case the original exercise price must be paid (the \"Option Repricing\"). 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On October 8, 2025, the Compensation Committee of the Board granted these options (referred to as \"Tranche 1 Options\" in the 2025 Plan) to the Reporting Person, subject to stockholder approval of the adoption of the 2025 Plan. The stockholders approved the adoption of the 2025 Plan on November 21, 2025."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"This option vests in 36 equal monthly installments over the three-year period beginning on December 21, 2025, subject to the Reporting Person's continued service to the registrant through each applicable vesting date."}],"balance_after":131700,"derivative":{"exercise_price":0.841,"expiration_date":"2035-10-07","underlying":"Common Stock","underlying_shares":131700},"source":{"system":"sec-edgar","filing":"0001193125-25-297207","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1840233/000119312525297207/ownership.xml","form_type":"4"}},{"id":1313124,"issuer":{"id":7122,"kind":"organization","name":"Xilio Therapeutics, Inc."},"owners":[{"id":70235,"kind":"person","name":"Brennan Kevin 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