The S-4 effectiveness signals that a merger or acquisition transaction is progressing toward closing. Monitor for the definitive proxy/prospectus and shareholder vote date. The absence of pricing or deal value in this filing means the market impact depends on the underlying transaction terms, which are not yet public from this notice.
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Executive Summary
The SEC declared effective Rallybio Corp's S-4 registration statement (File No. 333-297483) on October 15, 2026. This effectiveness allows Rallybio to register securities in connection with a business combination or merger transaction, likely a step toward completing a previously announced deal. The filing does not disclose the specific terms or counterparty.
Key Facts
- Effectiveness date: October 15, 2026
- SEC File Number: 333-297483
- Form type: S-4 (registration for business combination transactions)
- No offering size, pricing, or counterparty details disclosed in this EFFECT notice
Financial Impact
Undisclosed — the S-4 registration covers securities to be issued in a business combination; no dollar amounts provided in the EFFECT notice.
Risk Factors
- Dilution from new shares issued in the business combination
- Execution risk if the merger fails to close or is delayed
- Limited information in this filing — no deal terms or counterparty disclosed
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| EFFECT Filing (Primary) | 9999999995-26-003252 |
| Document: 9999999995-26-003252-index.html | 9999999995-26-003252 |
| Document: 9999999995-26-003252.txt | 9999999995-26-003252 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 26, 2026 today | 425 | — | awaiting T+60 | — | — |
Oct 26, 2026 today | 8-K | — | awaiting T+60 | — | — |
Oct 16, 2026 10d ago | EFFECT | $16.28 | awaiting T+60 | — | $16.65 (+2.27%) |
Oct 14, 2026 12d ago | S-4/A | $16.78 | awaiting T+60 | — | $16.65 (−0.75%) |
Jul 15, 2026 14w ago | S-4 | $15.96 $17.02 | ▲ +6.64% | ▲ +2.93% | $16.65 (+4.32%) |
Jun 1, 2026 21w ago | 425 | $16.87 $16.89 | ▲ +0.09% | ▼ −1.14% | $16.65 (−1.30%) |
Jun 1, 2026 21w ago | 8-K | $16.87 $16.89 | ▲ +0.09% | ▼ −1.14% | $16.65 (−1.30%) |
May 4, 2026 25w ago | 8-K | $14.12 $15.96 | ▲ +13.03% | ▲ +11.17% | $16.65 (+17.92%) |
US Market Status
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