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RLYB 8-K: Stock split

Rallybio Corporation

Filed with the SEC on · accession 0001193125-26-455762

RLYB filed a 8-K (current report) with the SEC on Nov 10, 2026. Rallybio Corporation announced a one-for-two reverse stock split of its common stock, approved by its Board of Directors on November 8, 2026, in connection with its pending merger with Avenzo Therapeutics. The stock moved +0.6% by the first close after the filing.

Summary of the filing

Rallybio Corporation announced a one-for-two reverse stock split of its common stock, approved by its Board of Directors on November 8, 2026, in connection with its pending merger with Avenzo Therapeutics. The reverse split is expected to become effective on November 20, 2026, reducing outstanding shares from approximately 5.6 million to 2.8 million.

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

Key details

Approximate number of issued and outstanding shares before reverse split$5.6M
Approximate number of issued and outstanding shares after reverse split$2.8M
RegistrantRallybio Corporation
Merger partnerAvenzo Therapeutics, Inc.
Merger subsidiaryFarmington Merger Sub, Inc.
Exchange agent and transfer agentComputershare Trust Company, N.A.

How RLYB stock reacted

Close before

$15.66

Nov 9, 2026

First close after

+0.64%

$15.76

5 trading days

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Since filing

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Frequently asked questions

What did RLYB file with the SEC on Nov 10, 2026?

RLYB filed a 8-K (Stock split). Rallybio Corporation announced a one-for-two reverse stock split of its common stock, approved by its Board of Directors on November 8, 2026, in connection with its pending merger with Avenzo Therapeutics. The reverse split is expected to become effective on November 20, 2026, reducing outstanding shares from approximately 5.6 million to 2.8 million.

What does a stock split mean for RLYB stock?

Usually: fewer shares means each remaining share owns more of the company. It matters whether the company actually buys and at what price.

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 RLYB stock react to this filing?

RLYB closed at $15.66 before the filing and $15.76 on Nov 10, 2026 (+0.64%).

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