Adaptimmune Therapeutics PLC - American Depositary Shares, each representing 6 Ordinary Shares (ADAPY)

Q: What does CUSIP 00653A107 represent in this 13F holders report?

CUSIP 00653A107 is the security identifier for ADAPY - Adaptimmune Therapeutics PLC - American Depositary Shares, each representing 6 Ordinary Shares used to aggregate holder disclosures.

Q: How many institutions held ADAPY - Adaptimmune Therapeutics PLC - American Depositary Shares, each representing 6 Ordinary Shares in Q1 2025?

66 institutional investors reported ADAPY - Adaptimmune Therapeutics PLC - American Depositary Shares, each representing 6 Ordinary Shares for Q1 2025. Use the holders table for investor-level position and value details.

CUSIP: 00653A107

Q1 2025 13F Holders as of 31 Mar 2025

Security type / class: Equity / American Depositary Shares, each representing 6 Ordinary Shares
Total 13F shares: 116,071,575
Total 13F value: $22,853,519
Share change: -8,324,286
Put/Call ratio: 18%
SEC-reported price per share: $0.20
Number of holders: 66
Value change: -$8,159,230
Number of buys: 24
Number of sells: 35
Shares outstanding: 1,571,428,571

Security key

00653A107

Report period

Q1 2025

Institutions

Top holders

ADAPY full security history Ownership snapshot Full 13F holder table Newer quarter: Q2 2026 Adaptimmune Therapeutics PLC SEC filings Adaptimmune Therapeutics PLC company facts

Broader feeds

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

Reporting periods

Holder history for CUSIP 00653A107

Newer quarter: Q2 2026

Recent filing periods:

Q2 2026

Ownership snapshot

Top reported holders of ADAPY - Adaptimmune Therapeutics PLC - American Depositary Shares, each representing 6 Ordinary Shares (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

BAILLIE GIFFORD & CO

Disclosed value leader

BAILLIE GIFFORD & CO

Comparable rows

15/15

Latest evidence

31 Dec 2024

13D/G 13F Lead comparable stake: 4.6% 13D/G row: BAILLIE GIFFORD & CO Showing 1-6 of 15 holder rows.

Quick read

BAILLIE GIFFORD & CO leads the comparable SEC ownership view at 4.6%.

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 BAILLIE GIFFORD & CO's linked filing trail.

Comparable ownership Top 5

BAILLIE GIFFORD & CO 4.6%

EcoR1 Capital, LLC 1.7%

Long Focus Capital Management, LLC 1.3%

NEA Management Company, LLC 1.1%

Two Seas Capital LP 0.94%

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
BAILLIE GIFFORD & CO	13D/G 13F Company 13D/G 13F	4.6%	$19,146,934 70,914,570 shares	$0	31 Dec 2024
EcoR1 Capital, LLC	13F Company 13F	1.7%	$14,762,573 27,404,070 shares	—	31 Dec 2024
Long Focus Capital Management, LLC	13F Company 13F	1.3%	$11,040,330 20,494,393 shares	—	31 Dec 2024
NEA Management Company, LLC	13F Company 13F	1.1%	$9,200,876 17,079,778 shares	—	31 Dec 2024
Two Seas Capital LP	13F Company 13F	0.94%	$7,991,693 14,835,146 shares	—	31 Dec 2024
MPM ASSET MANAGEMENT LLC	13F Company 13F	0.35%	$2,994,393 5,555,461 shares	—	31 Dec 2024

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 Q1 2025

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

Institutions

116,071,575

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 Q1 2025 vs Q1 2025 Across Filers

Q1 2025 holders

Holder diff

Investor	Q1 2025 Shares	Q1 2025 Shares	Share Diff	Share Chg %	Q1 2025 value	Q1 2025 value	Value change	Value Chg %

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

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend