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ACET 8-K: Board change

Filed with the SEC on · accession 0001720580-26-000069

ACET filed a 8-K (current report) with the SEC on Nov 13, 2026. Director Andrew Sinclair, Ph.D. resigned from Adicet Bio's board and its Audit and Nominating/Corporate Governance committees effective November 13, 2026, reducing the board from seven to six members. The stock moved -4.4% by the first close after the filing.

Summary of the filing

Director Andrew Sinclair, Ph.D. resigned from Adicet Bio's board and its Audit and Nominating/Corporate Governance committees effective November 13, 2026, reducing the board from seven to six members. The board appointed current director Michael Grissinger to the Audit Committee and as chairperson of the NCG Committee.

For details, click here →How to read a 8-K →

Key details

RegistrantAdicet Bio, Inc.
Listing exchangeThe Nasdaq Stock Market
Class iii directorAndrew Sinclair, Ph.D.
DirectorMichael Grissinger
Chief financial officerNick Harvey

How ACET stock reacted

Close before

$2.93

Nov 12, 2026

First close after

-4.44%

$2.80

5 trading days

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Since filing

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Frequently asked questions

What did ACET file with the SEC on Nov 13, 2026?

ACET filed a 8-K (Board change). Director Andrew Sinclair, Ph.D. resigned from Adicet Bio's board and its Audit and Nominating/Corporate Governance committees effective November 13, 2026, reducing the board from seven to six members. The board appointed current director Michael Grissinger to the Audit Committee and as chairperson of the NCG Committee.

What does a board change mean for ACET stock?

Not always. A planned retirement with a successor is usually calm; a sudden departure “effective immediately”, especially of a CFO or near results, often worries investors.

How do I read a 8-K?

A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The "Item" number tells you the topic (e.g. 2.02 results, 5.02 executive change, 1.01 new agreement, 1.03 bankruptcy). Exhibits (99.1 press release) usually hold the details.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 8-K (current report): A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more.

How did ACET stock react to this filing?

ACET closed at $2.93 before the filing and $2.80 on Nov 13, 2026 (-4.44%).

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