Xilio Therapeutics, Inc. - Common Stock, par value $0.0001 per share (XLO)

Q: What does CUSIP 98422T100 represent in this 13F holders report?

CUSIP 98422T100 is the security identifier for XLO - Xilio Therapeutics, Inc. - Common Stock, par value $0.0001 per share used to aggregate holder disclosures.

Q: How many institutions held XLO - Xilio Therapeutics, Inc. - Common Stock, par value $0.0001 per share in Q4 2023?

33 institutional investors reported XLO - Xilio Therapeutics, Inc. - Common Stock, par value $0.0001 per share for Q4 2023. Use the holders table for investor-level position and value details.

CUSIP: 98422T100

Q4 2023 13F Holders as of 31 Dec 2023

Security type / class: Equity / Common Stock, par value $0.0001 per share
Total 13F shares: 16,426,281
Total 13F value: $9,034,716
Share change: -909,000
SEC-reported price per share: $0.55
Number of holders: 33
Value change: -$1,543,598
Number of buys: 12
Number of sells: 7
Shares outstanding: 6,426,426

Security key

98422T100

Report period

Q4 2023

Institutions

Top holders

XLO full security history Ownership snapshot Full 13F holder table Newer quarter: Q3 2025 Xilio Therapeutics, Inc. SEC filings Xilio Therapeutics, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Reporting periods

Holder history for CUSIP 98422T100

Newer quarter: Q3 2025

Recent filing periods:

Q1 2026 Q4 2025 Q3 2025

Ownership snapshot

Top reported holders of XLO - Xilio Therapeutics, Inc. - Common Stock, par value $0.0001 per share (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader

Bain Capital Life Science...

Disclosed value leader

Bain Capital Life Science...

Comparable rows

15/15

Latest evidence

30 Sep 2023

13F 3/4/5 Lead comparable stake: 44% Showing 1-6 of 15 holder rows.

Quick read

Bain Capital Life Sciences Investors, LLC leads the comparable SEC ownership view at 44%.

15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens Bain Capital Life Sciences Investors, LLC's linked filing trail.

Comparable ownership Top 5

Bain Capital Life Sciences Invest... 44%

Atlas Venture Life Science Adviso... 43%

Octagon Capital Advisors LP 36%

FMR LLC 30%

RiverVest Venture Management LLC 22%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 15 holder rows

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
Bain Capital Life Sciences Investors, LLC	13F 3/4/5 Company · 10%+ Owner 13F 3/4/5	44%	$5,919,421 2,805,413 shares	—	30 Sep 2023
Atlas Venture Life Science Advisors, LLC	13F Company 13F	43%	$5,822,216 2,759,344 shares	—	30 Sep 2023
Octagon Capital Advisors LP	13F Company 13F	36%	$4,892,035 2,318,500 shares	—	30 Sep 2023
FMR LLC	13F 3/4/5 Company · Other* 13F 3/4/5	30%	$4,025,186 1,907,671 shares	—	30 Sep 2023
RiverVest Venture Management LLC	13F Company 13F	22%	$3,041,447 1,441,444 shares	—	30 Sep 2023
Rock Springs Capital Management LP	13F 3/4/5 Company · 10%+ Owner 13F 3/4/5	22%	$3,040,001 1,440,759 shares	—	30 Sep 2023

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2023

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions

16,426,281

Rows available

Investor	Option	Weight %	Change %	SEC-reported value	* Price	Shares	Share Change	Activity	Report Period

^* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q4 2023 vs Q4 2025 Across Filers

Q4 2025 holders

Q4 2023 holders

Holder diff

-4

Investor	Q4 2025 Shares	Q4 2023 Shares	Share Diff	Share Chg %	Q4 2025 value	Q4 2023 value	Value change	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend