Rallybio (RLYB) Held by Superinvestors
RALLYBIO CORP (RLYB) is currently held by 2 superinvestors tracked by InsiderSet, with a combined reported market value of approximately $11.59M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Viking Global Investors is currently the largest disclosed institutional shareholder of RLYB tracked by InsiderSet, reporting ownership valued at approximately $8.39M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $8.73M, representing an estimated gain of +4.00% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 100% of the total disclosed RLYB value among the investors covered in this analysis. Major shareholders include Viking Global Investors, Renaissance Technologies LLC, and several other long-term asset managers with concentrated positions in RALLYBIO CORP (RLYB).
This page ranks the largest institutional RLYB shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Viking Global Investors | Ole Andreas Halvorsen | 0.02% | 524,347 | $8,389,552 | $8,725,134 | +$335,582 | +4.00% |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 199,907 | $3,198,512 | $3,326,452 | +$127,940 | +4.00% |
Frequently asked questions about RLYB
Who are the largest superinvestors holding RLYB?
The largest superinvestors holding RLYB in the latest SEC Form 13F filings include Viking Global Investors and Renaissance Technologies LLC. InsiderSet ranks these superinvestors by their latest reported RLYB position.
What does the RLYB superinvestors page include?
This page tracks RLYB positions reported by a curated group of notable institutional investors and fund managers through SEC Form 13F. RALLYBIO CORP (RLYB) on this page reflects disclosed 13F holdings among those superinvestors, not every institutional shareholder of the stock.
How many superinvestors hold RLYB?
InsiderSet currently tracks 2 superinvestors reporting RLYB holdings in the latest available 13F data. This is the curated set on this page, not the total number of institutions that own RLYB.
How much RLYB stock do superinvestors hold?
Superinvestors tracked by InsiderSet disclosed approximately $11.59M in RLYB holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value, and it covers the curated superinvestors on this page rather than every institutional filer.
When were RLYB superinvestor holdings last updated?
The latest RLYB superinvestor holdings on InsiderSet are based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time holdings.
Are superinvestor RLYB holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by these superinvestors as of the end of the reporting quarter. A superinvestor may have changed its RLYB position after the reporting date.
Are superinvestors buying or selling RLYB?
Buying and selling can be analyzed by comparing RLYB positions across consecutive 13F reporting periods. InsiderSet's RLYB Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View RLYB ownership changes.
How have superinvestor RLYB holdings changed over time?
InsiderSet tracks RLYB holdings among these superinvestors across multiple 13F reporting periods, so holder counts, reported value, and reported shares can be compared over time.