Timothy P. Clackson - Oct 21, 2021 Form 3 Insider Report for Xilio Therapeutics, Inc. (XLO)

Role: 10%+ Owner
Signature: /s/ Timothy Clackson
Stock symbol: XLO
Transactions as of: Oct 21, 2021
Transactions value $: $0
Form type: 3
Date filed: 10/21/2021, 08:52 PM
Previous filing: Oct 6, 2021
Next filing: Dec 22, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	XLO	Common Stock						20.1K	Oct 21, 2021	Direct
holding	XLO	Common Stock						70.9K	Oct 21, 2021	The Timothy P. Clackson Irrevocable GST Trust of 2020

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
holding	XLO	Stock Option (right to buy)							Oct 21, 2021	Common Stock	7.53K	$5.51	Direct	F1
holding	XLO	Stock Option (right to buy)							Oct 21, 2021	Common Stock	2.78K	$5.51	Direct	F2
holding	XLO	Stock Option (right to buy)							Oct 21, 2021	Common Stock	5.28K	$5.51	Direct	F3
holding	XLO	Stock Option (right to buy)							Oct 21, 2021	Common Stock	5.21K	$5.89	Direct	F4

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The option was granted on July 23, 2020 for 32,846 shares. On May 21, 2019, 25% of the shares underlying the option vested and the remaining shares shall vest in equal monthly installments until May 21, 2022.
F2	The option was granted on July 23, 2020 for 11,104 shares. On June 14, 2020, 25% of the shares underlying the option vested and the remainder shall vest in equal monthly installments thereafter until June 14, 2023.
F3	The option was granted on July 23, 2020 for 23,045 shares. The shares began vesting on March 12, 2020 and shall vest in equal monthly installments until February 12, 2024.
F4	The option was granted on March 11, 2021 for 35,752 shares. The shares underlying the option began vesting on April 1, 2021 and shall vest in equal monthly installments thereafter until March 1, 2025.