Adicet Bio, Inc. (ACET)

Nasdaq: ACET · Pharmaceutical Preparations · Boston, MA · filing with the SEC since 2017

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Grade4.9

◀ Past 4.1● Present 5.8▶ Future 4.7

6 est.

Overview Business Financials Grade Forecast Sentiment Ownership People Filings Patents Chart

Who owns Adicet Bio, Inc.

As filed with the SEC

Holders of 5% or more

RA Capital Management, L.P. holds 9.9% of Common Stock, par value $0.0001 per share, as its SCHEDULE 13G/A filed Aug 14, 2026 says.

Directors and officers

report now, of 36 people on the record since 2018. Their holdings as a group are not read here.

Institutions as a whole

n/a

The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.

Holders of 5% or moreshare of the class, as filed

RA Capital Management, L.P.

SCHEDULE 13G/A · filed Aug 14, 2026 · Common Stock, par value $0.0001 per share · 12.3% in Apr 13, 2026

9.9%

Orbimed Advisors LLC

SCHEDULE 13D/A · filed Apr 10, 2026 · Common Stock, par value $0.0001 · 9.6% in Oct 10, 2025

8.8%

Franklin Resources, Inc.

SCHEDULE 13G · filed Jan 29, 2026 · Common Stock, par value $0.0001 per share

6.5%

Zedek Daniel Clayton

SCHEDULE 13G · filed Oct 23, 2026 · Common Stock, $0.0001 par vaue

5.4%

Woodline Partners LP

SCHEDULE 13G/A · filed May 15, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%, from 6.5% in Feb 17, 2026

under 5%

Tang Capital Management, LLC

SCHEDULE 13G/A · filed Feb 17, 2026 · Common Stock, par value $0.0001 per share · reported falling below 5%, from 9.9% in May 15, 2025

under 5%

What ACET reports owning in othersstakes of 5% or more, and other ties

Adicet Bio, Inc. reports no stake in another company in the record.

Insider tradesForm 4

4sales

2purchases

0sales on a scheduled plan

1people selling

$700,000sold, in dollars

$5.0Mbought, in dollars

Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.

By calendar yearSoldBought

18212223242526

2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.

People who traded in the window3 of 41 on the roster

Person	Role as filed	Sales	Sold	Buys	Bought
Orbimed Advisors Israel II Ltd	director	4	$700,000	0	$0
Ra Capital Healthcare Fund LP	10% owner	0	$0	3	$1.6M
Orbimed Advisors LLC	director	0	$0	2	$5.0M

SI Assistanton ACET · research, not advice