RLYB Institutional Ownership & Shareholders
RALLYBIO CORP (RLYB) is currently held by 36 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $65.04M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Adar1 Capital Management, Llc is currently the largest disclosed institutional shareholder of RLYB tracked by InsiderSet, reporting ownership valued at approximately $14.82M 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 $14.60M, representing an estimated loss of -1.50% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 91% of the total disclosed RLYB value among the investors covered in this analysis. Major shareholders include Adar1 Capital Management, Llc, Fmr Llc, Viking Global Investors, 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.
Institutional Holders
36
Total Reported Value
$65.04M
Largest Holder
Adar1 Capital Management, Llc
Largest Position
$14.82M
Insider Transactions (90d)
44
Latest Filing Quarter
Q2 2026
New Institutional Positions
62
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Adar1 Capital Management, Llc | 0.70% | 926,352 | $14,821,632 | $14,599,308 | -$222,324 | -1.50% | |
| Fmr Llc | 0.00% | 794,720 | $12,715,520 | $12,524,787 | -$190,733 | -1.50% | |
| Viking Global Investors | Ole Andreas Halvorsen | 0.02% | 524,347 | $8,389,552 | $8,263,709 | -$125,843 | -1.50% |
| Tpg Gp A, Llc | 0.12% | 378,551 | $6,056,816 | $5,965,964 | -$90,852 | -1.50% | |
| Pivotal Bioventure Partners Investment Advisor Llc | 1.56% | 300,579 | $4,809,264 | $4,737,125 | -$72,139 | -1.50% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 199,907 | $3,198,512 | $3,150,534 | -$47,978 | -1.50% |
| Nantahala Capital Management, Llc | 0.18% | 188,422 | $3,014,752 | $2,969,531 | -$45,221 | -1.50% | |
| Vanguard Capital Management Llc | 0.00% | 172,497 | $2,759,952 | $2,718,553 | -$41,399 | -1.50% | |
| Almitas Capital Llc | 0.46% | 120,682 | $1,930,912 | $1,901,948 | -$28,964 | -1.50% | |
| Rangeley Capital, Llc | 1.56% | 104,850 | $1,677,600 | $1,652,436 | -$25,164 | -1.50% | |
| Citadel Advisors Llc | 0.00% | 72,200 | $1,155,200 | $1,137,872 | -$17,328 | -1.50% | |
| Mariner, Llc | 0.00% | 50,566 | $809,056 | $796,920 | -$12,136 | -1.50% | |
| Jane Street Group, Llc | 0.00% | 47,423 | $758,768 | $747,386 | -$11,382 | -1.50% | |
| Geode Capital Management, Llc | 0.00% | 32,047 | $512,865 | $505,061 | -$7,804 | -1.52% | |
| Blackrock, Inc. | 0.00% | 30,332 | $485,312 | $478,032 | -$7,280 | -1.50% | |
| Hrt Financial Lp | 0.00% | 25,657 | $410,000 | $404,354 | -$5,646 | -1.38% | |
| Xtx Topco Ltd | 0.00% | 21,497 | $343,952 | $338,793 | -$5,159 | -1.50% | |
| Vanguard Fiduciary Trust Co | 0.00% | 16,820 | $269,120 | $265,083 | -$4,037 | -1.50% | |
| Two Sigma Investments, Lp | 0.00% | 16,619 | $265,904 | $261,915 | -$3,989 | -1.50% | |
| State Street Corp | 0.00% | 12,996 | $207,936 | $204,817 | -$3,119 | -1.50% | |
| Quadrature Capital Ltd | 0.00% | 12,995 | $207,920 | $204,801 | -$3,119 | -1.50% | |
| Dimensional Fund Advisors Lp | 0.00% | 11,280 | $180,480 | $177,773 | -$2,707 | -1.50% | |
| Vanguard Global Advisers, Llc | 0.00% | 1,442 | $23,072 | $22,726 | -$346 | -1.50% | |
| Hartford Financial Management Inc. | 0.00% | 812 | $13,967 | $12,797 | -$1,170 | -8.38% | |
| Caitong International Asset Management Co., Ltd | 0.00% | 421 | $7,241 | $6,635 | -$606 | -8.37% | |
| Ubs Group Ag | 0.00% | 146 | $2,336 | $2,301 | -$35 | -1.50% | |
| Truvestments Capital Llc | 0.00% | 129 | $2,064 | $2,033 | -$31 | -1.50% | |
| Morgan Stanley | 0.00% | 125 | $2,000 | $1,970 | -$30 | -1.50% | |
| Bnp Paribas Financial Markets | 0.00% | 120 | $1,920 | $1,891 | -$29 | -1.50% | |
| Sbi Securities Co., Ltd. | 0.00% | 77 | $1,324 | $1,214 | -$110 | -8.34% | |
| Fortitude Family Office, Llc | 0.00% | 53 | $912 | $835 | -$77 | -8.41% | |
| Wells Fargo & Company/Mn | 0.00% | 37 | $592 | $583 | -$9 | -1.50% | |
| Jpmorgan Chase & Co | 0.00% | 9 | $145 | $142 | -$3 | -2.18% | |
| Allworth Financial Lp | 0.00% | 6 | $96 | $95 | -$1 | -1.50% | |
| Barclays Plc | 0.00% | 3 | $48 | $47 | -$1 | -1.50% | |
| Danske Bank A/S | 0.00% | 1 | $16 | $16 | -$0 | -1.50% |
Frequently asked questions about RLYB
Who are the largest institutional holders of RLYB?
The largest institutional holders of RLYB reported in the latest SEC Form 13F filings include Adar1 Capital Management, Llc, Fmr Llc, Viking Global Investors, Tpg Gp A, Llc, and Pivotal Bioventure Partners Investment Advisor Llc. InsiderSet ranks institutional holders by their latest reported RLYB position.
What is RLYB institutional ownership?
This page tracks RLYB positions reported by institutional investment managers through SEC Form 13F. RALLYBIO CORP (RLYB) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own RLYB?
InsiderSet currently tracks 36 institutional managers reporting RLYB holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of RLYB shareholders.
How much RLYB stock do institutions own?
Institutional investment managers disclosed approximately $65.04M in RLYB holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was RLYB institutional ownership last updated?
The latest RLYB institutional ownership data on InsiderSet is 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 institutional holdings.
Are institutional RLYB holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its RLYB position after the reporting date.
Are institutions buying or selling RLYB?
Institutional 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 has RLYB institutional ownership changed over time?
InsiderSet tracks RLYB institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.