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$RLYB
$15.93 -$0.72 (4.32%) Close

Ownership

13F as of Q2 2026 · 5.4M shares outstanding

Who owns RLYB?

By type of holder
Institutions 75.5% Insiders 24.5% Everyone else 0.0%
Concentration Top 10 holders own 85.1%
ADAR1 Capital Management, LLC 17.2% · FMR LLC 14.8%
Institutional ownership
75.5%
-11.2 pts vs last qtr
Institutional holders
37
-1 vs last qtr
Net shares bought
−601.2K
by institutions in Q2 2026
New / sold out
9 / 10
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • ADAR1 Capital Management, LLC +905.8K
  • Rangeley Capital, LLC +74.7K

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Biggest sellers in Q2 2026
  • Cormorant Asset Management, LP SOLD OUT −400.0K
  • Balyasny Asset Management L.P. SOLD OUT −376.6K

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Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Rallybio Corp in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2021–FY2025
+76.5%
+15.26% a year
Each share's claim on the business
−43.3%
shrank without buying or selling a share
Spent on buybacks vs paid in stock
— vs $37.4M
over 5 fiscal years
Diluted shares, split-adjusted
3.1M4.4M5.7M2021: 3.2M shares'212022: 4.0M shares'222023: 5.1M shares'232024: 5.4M shares'242025: 5.6M shares'25
Buybacks Stock-based comp
$0$5.5M$10.9M2021 buybacks: $02021 stock comp: $3.6M'212022 buybacks: $02022 stock comp: $9.5M'222023 buybacks: $02023 stock comp: $10.9M'232024 buybacks: $02024 stock comp: $8.0M'242025 buybacks: $02025 stock comp: $5.3M'25

How patient are the owners?

Institutional shares by how long they've been held
5+ years0% 3–5 years57% 1–3 years10% Under 1 year33%
Quarterly turnover
33.9%
of institutional shares changed hands
Top 10 managers, median time held
4.5 years

Super Investors

Investment managers reporting RLYB on Form 13F
AC
ADAR1 Capital Management, LLC
Shares
926.4K
% of company
17.21%
Change vs last qtr
+905.8K (+4411.1%)
Held since
Q1 '26
F
FMR LLC
Shares
794.7K
% of company
14.76%
Change vs last qtr
+1.3K (+0.2%)
Held since
2021

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Institutional Funds

Mutual funds and ETFs reporting RLYB on Form N-PORT; together they hold 10.0% of the company
FG
Fidelity Growth Company Fund
Fidelity Mt. Vernon Street Trust
Position value
$3.48M
% of company
3.85%
% of the fund
0.00%
As of
August 31, 2026
VT
Vanguard Total Stock Market Index Fund
Vanguard Index Funds
Position value
$2.15M
% of company
2.50%
% of the fund
0.00%
As of
June 30, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
HR
Hopfner Robert Lorne
Insider
Shares
510.0K
% of company
9.47%
Change vs last qtr
—
Held since
—
JG
James G. Coulter
5%+ holder13D · 7.2%
Shares
378.6K
% of company
7.03%
Change vs last qtr
—
Held since
—

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