Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Achilles Therapeutics plc

CIK 0001830749· quarter ending 2026-06-30

Shares outstanding

41,082,948

as of 2023-12-31 · 20-F cover page, filed 2024-04-04

Held by 13F filers

66,792

0.2% of shares outstanding

Holders

+0 vs 2026-03-31 · 0 new, 0 exited

Value

$99K

shares +85.3% vs prior quarter

Share classes (cover page of the 20-F filed 2024-04-04, as of 2023-12-31)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	ACHL · NASDAQ	41,082,948	66,792	0.2%	3	00449L102

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	00449L102	COM	3	66,792	41,082,948	0.2%	$99K	—	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings.

Top holders (3 of 3 · 00449L102)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	Trium Capital LLP	61,506	0.15%	$91K	+30,753 (+100.0%)
2	RHUMBLINE ADVISERS	4,480	0.01%	$7K	—
3	GAMMA Investing LLC	806	0.00%	$1K	—

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
BML Investment Partners, L.P.	SCHEDULE 13G/A	2025-02-13	2024-12-31	4,100,002	9.97%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.