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Schedule 13G/A

RLYB Schedule 13G/A filing by Fidelity / FMR

Fidelity / FMR reported beneficial ownership of 794.7K shares, representing 15% of Rallybio Corp in this filing.

FiledAug 6, 2026
Ownership dateJun 30, 2026
Reported shares794.7K
Reported ownership15%
Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 794.7K
Shared voting power 0
Sole dispositive power 794.7K
Shared dispositive power 0
Compared with the prior filing

How the reported position changed

This compares the current filing with the previous tracked Schedule 13 filing from the same reporting CIK for RLYB. A change between filings does not by itself establish when shares were bought or sold.

Previous filingMar 6, 2026
Reported share change+421,893
Ownership percentage change+3 pts
Previous filingThis filing
Reported shares372.8K794.7K
Reported ownership12%15%
Price context

Price dates alongside the ownership filing

Price data provides market context around the disclosure. It does not identify the filer’s actual transaction price.

Close near filing date$16.20as of Aug 6, 2026
Latest tracked price$16.14as of Aug 5, 2026
Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer
Fidelity / FMR
CIK
CIK0000315066
Accession
0000315066-26-002189
Form
Schedule 13G/A
Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.