organization · Reporting owner

Four Pines Master Fund LP

Disclosed activity across 1 company

Tapewire entity: 134213
SEC CIK: 0001888685

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Reported relationships

Latest disclosed role at each company.

No relationships currently tracked through insider filings.

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

No balances currently tracked through insider filings.

Past disclosures · reporting ended (1)

No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.

Xilio Therapeutics, Inc.

Report date October 26, 2021 · Filed October 26, 2021

Jointly reported with Rock Springs Capital Management LP, Rock Springs Capital LLC, Rock Springs Capital Master Fund LP

Section 16 reporting ended · disclosed 2021-10-26. Current position is not established by this disclosure.

Security / award	Ownership account	Disclosed shares / units	Disclosure context
Common StockSEC Table I · non-derivative	IndirectSee footnote	756,472	Reported balance After 2021-10-26 transaction · row 1 Joint disclosure: continuity of the reported position is unresolved; see ownership footnotes. 1 source row Row 1 · 2021-10-26 · Conversion · Acquired 756,472 · Balance 756,472 F1: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F2: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund.
Common StockSEC Table I · non-derivative	IndirectSee footnote	151,294	Reported balance After 2021-10-26 transaction · row 2 Joint disclosure: continuity of the reported position is unresolved; see ownership footnotes. 1 source row Row 2 · 2021-10-26 · Conversion · Acquired 151,294 · Balance 151,294 F1: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F3: The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Four Pines.
Common StockSEC Table I · non-derivative	IndirectSee footnote	1,256,472	Reported balance After 2021-10-26 transaction · row 3 Joint disclosure: continuity of the reported position is unresolved; see ownership footnotes. 1 source row Row 3 · 2021-10-26 · Purchase · Acquired 500,000 · Balance 1,256,472 F2: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund.
Series C Preferred StockSEC Table II · derivative / convertible security	IndirectSee footnote	0	Reported balance After 2021-10-26 transaction · row 4 Instrument identity requires review; Table II rows are not merged. 1 source row Row 4 · 2021-10-26 · Conversion · Disposed 7,186,490 · Balance 0 F1: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F2: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund.
Series C Preferred StockSEC Table II · derivative / convertible security	IndirectSee footnote	0	Reported balance After 2021-10-26 transaction · row 5 Instrument identity requires review; Table II rows are not merged. 1 source row Row 5 · 2021-10-26 · Conversion · Disposed 1,437,297 · Balance 0 F1: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F3: The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Four Pines.

Filing footnotes · ownership attribution and instrument terms

F1: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date.

F2: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund.

F3: The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Four Pines.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction date	Company	Activity / security	Shares / units	Reported price	Reported value	Details
October 26, 2021 Filed Oct 26, 2021 21:04 UTC	Xilio Therapeutics, Inc. XLO · Entity 7122	ConversionSeries C Preferred Stock · Derivative	1,437,297	Not disclosed	Not disclosed	Disclosure SEC source: 0001104659-21-130031 · tm2130646-27_4seq1.xml · derivative · entry 5 Rock Springs Capital Management LP · CIK 0001595725 · 10% owner Rock Springs Capital LLC · CIK 0001735397 · 10% owner Rock Springs Capital Master Fund LP · CIK 0001735393 · 10% owner Four Pines Master Fund LP · CIK 0001888685 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Indirect · See footnote Disclosed balance after: 0 Underlying: Common Stock · 151,294 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · derivative.exercise_price: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F1 · price: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F1 · derivative.exercise_date: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F1 · derivative.expiration_date: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F3 · ownership.nature: The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Four Pines. Read SEC document
October 26, 2021 Filed Oct 26, 2021 21:04 UTC	Xilio Therapeutics, Inc. XLO · Entity 7122	ConversionSeries C Preferred Stock · Derivative	7,186,490	Not disclosed	Not disclosed	Disclosure SEC source: 0001104659-21-130031 · tm2130646-27_4seq1.xml · derivative · entry 4 Rock Springs Capital Management LP · CIK 0001595725 · 10% owner Rock Springs Capital LLC · CIK 0001735397 · 10% owner Rock Springs Capital Master Fund LP · CIK 0001735393 · 10% owner Four Pines Master Fund LP · CIK 0001888685 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Indirect · See footnote Disclosed balance after: 0 Underlying: Common Stock · 756,472 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · derivative.exercise_price: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F1 · price: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F1 · derivative.exercise_date: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F1 · derivative.expiration_date: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F2 · ownership.nature: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund. Read SEC document
October 26, 2021 Filed Oct 26, 2021 21:04 UTC	Xilio Therapeutics, Inc. XLO · Entity 7122	PurchaseCommon Stock	500,000	$16.00	$8,000,000.00	Disclosure SEC source: 0001104659-21-130031 · tm2130646-27_4seq1.xml · nonDerivative · entry 3 Rock Springs Capital Management LP · CIK 0001595725 · 10% owner Rock Springs Capital LLC · CIK 0001735397 · 10% owner Rock Springs Capital Master Fund LP · CIK 0001735393 · 10% owner Four Pines Master Fund LP · CIK 0001888685 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Indirect · See footnote Disclosed balance after: 1,256,472 F2 · ownership.nature: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund. Read SEC document
October 26, 2021 Filed Oct 26, 2021 21:04 UTC	Xilio Therapeutics, Inc. XLO · Entity 7122	ConversionCommon Stock	151,294	Not disclosed	Not disclosed	Disclosure SEC source: 0001104659-21-130031 · tm2130646-27_4seq1.xml · nonDerivative · entry 2 Rock Springs Capital Management LP · CIK 0001595725 · 10% owner Rock Springs Capital LLC · CIK 0001735397 · 10% owner Rock Springs Capital Master Fund LP · CIK 0001735393 · 10% owner Four Pines Master Fund LP · CIK 0001888685 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Indirect · See footnote Disclosed balance after: 151,294 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · price: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F3 · ownership.nature: The securities reported herein are held of record by Four Pines Master Fund LP ("Four Pines"). RSC is the general partner of RSCM which is the investment manager to Four Pines. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Four Pines. Read SEC document
October 26, 2021 Filed Oct 26, 2021 21:04 UTC	Xilio Therapeutics, Inc. XLO · Entity 7122	ConversionCommon Stock	756,472	Not disclosed	Not disclosed	Disclosure SEC source: 0001104659-21-130031 · tm2130646-27_4seq1.xml · nonDerivative · entry 1 Rock Springs Capital Management LP · CIK 0001595725 · 10% owner Rock Springs Capital LLC · CIK 0001735397 · 10% owner Rock Springs Capital Master Fund LP · CIK 0001735393 · 10% owner Four Pines Master Fund LP · CIK 0001888685 · 10% owner Joint disclosure: these amounts are not allocated separately to each reporting owner. 10b5-1 filing: Not disclosed Ownership: Indirect · See footnote Disclosed balance after: 756,472 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · price: The Series C Preferred Stock converted into shares of the Issuer's common stock, $0.001 par value, on a 9.5:1 basis automatically immediately prior to the closing of the Issuer's initial public offering. The Series C Preferred Stock had no expiration date. F2 · ownership.nature: The securities reported herein are held of record by Rock Springs Capital Master Fund LP ("Master Fund"). Rock Springs Capital LLC ("RSC") is the general partner of Rock Springs Capital Management LP ("RSCM") which is the investment manager to Master Fund. RSC and RSCM may therefore be deemed to have or share beneficial ownership of the shares held directly by Master Fund. Read SEC document

Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.