Vault-13

RALLYBIO CORP RLYB

COM · Common Stock · CUSIP 75120L209

37 institutional holders -1 vs Q1 2026
11,887,20211.9m shares reported held*
$79.6mreported value*
9 new 10 added 6 reduced 10 sold out net bought ≈ $5.0m (+7.2m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $6.70.

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

02040Q4 25: 1Q1 26: 38Q2 26: 3737Q4 25Q1 26Q2 26
Numbers
QuarterHolders
Q4 20251
Q1 202638
Q2 202637

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q1 26: 35 bought or addedQ1 26: 1 cut or sold outQ1 26Q2 26: 19 bought or addedQ2 26: 16 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q1 2026351
Q2 20261916

Biggest buyers

CITADEL ADVISORS LLC Added +7,685,901+7.7m
ADAR1 Capital Management, LLC Added +905,817+905.8k
Nantahala Capital Management, LLC Added +76,209+76.2k
Rangeley Capital, LLC Added +74,720+74.7k
VANGUARD CAPITAL MANAGEMENT LLC Added +60,457+60.5k
JANE STREET GROUP, LLC New +47,423+47.4k
RENAISSANCE TECHNOLOGIES LLC Added +43,380+43.4k
HRT FINANCIAL LP New +25,657+25.7k
TWO SIGMA INVESTMENTS, LP New +16,619+16.6k
STATE STREET CORP New +12,996+13.0k

Biggest sellers

Cormorant Asset Management, LP Sold out -400,000-400.0k
Balyasny Asset Management L.P. Sold out -376,573-376.6k
Laurion Capital Management LP Sold out -302,756-302.8k
5AM Venture Management, LLC Sold out -291,788-291.8k
JOHNSON & JOHNSON Sold out -152,901-152.9k
AJU IB Investment Co., Ltd. Sold out -94,334-94.3k
Almitas Capital LLC Reduced -70,524-70.5k
DELTEC ASSET MANAGEMENT LLC Sold out -33,750-33.8k
GTS SECURITIES LLC Sold out -22,016-22.0k
ACADIAN ASSET MANAGEMENT LLC Sold out -10,433-10.4k

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
ADAR1 Capital Management, LLC 13G · institution new · filed 2026-06-05 17.5% new 926.4k≈ $14.8m 2026-06-05
FMR LLC 13G · passive investor +4.4 pts · filed 2026-08-06 15.0% +4.4 pts 794.7k≈ $12.7m 2026-08-06
VIKING GLOBAL INVESTORS LP 13G · passive investor filed 2026-05-15 10.0% 529.0k≈ $8.5m 2026-05-15

Fell to 5% or below in the last year: BALYASNY ASSET MANAGEMENT L.P. (0.0%, 2026-08-14), Nantahala Capital Management, LLC (3.6%, 2026-08-14), Cormorant Asset Management, LP (0.0%, 2026-08-14), Laurion Capital Management LP (0.0%, 2026-08-04), 5AM Ventures V, L.P. (0.0%, 2026-05-06), JOHNSON & JOHNSON (2.9%, 2026-04-13)

Insider purchases and sales since 1 Apr 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
101Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 1 sellingQ1 26Q2 26: 0 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 0 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—0——
Q4 20250—0——
Q1 20260—1$4.0k—
Q2 20260—0——
Q3 20260—0——
DateInsiderTradeSharesPrice ValueTheir holding
2026-05-19 Schneeberger Daniel +1 10% owner · See Footnote Bought 10,200 $13.98 $142.6k10.2k shares +1%
2026-05-18 Schneeberger Daniel +1 10% owner · See Footnote Bought 6,009 $13.98 $84.0k6.0k shares +1%
2026-05-15 Schneeberger Daniel +1 10% owner · See Footnote Bought 300 $13.90 $4.2k300 shares +<1%
2026-05-13 Schneeberger Daniel +1 10% owner · See Footnote Bought 79,259 $13.99 $1.1m79.3k shares +10%
2026-05-12 Schneeberger Daniel +1 10% owner · See Footnote Bought 800 $13.83 $11.1k800 shares +<1%
2026-05-11 Schneeberger Daniel +1 10% owner · See Footnote Bought 50,000 $14.00 $700.0k50.0k shares +6%
2026-05-05 Schneeberger Daniel +1 10% owner · See Footnote Bought 35,101 $14.00 $491.4k35.1k shares +5%
2026-05-04 Schneeberger Daniel +1 10% owner · See Footnote Bought 120,804 $13.97 $1.7m120.8k shares +19%

Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 CITADEL ADVISORS LLC 0.01% of their portfolio MIAMI, FL 7,705,7877.7m $12.7m $12.7m 0.01% Added +7.7m +7,685,901
2 ADAR1 Capital Management, LLC 0.70% of their portfolio AUSTIN, TX 926,352926.4k $14.8m $14.8m 0.70% Added +905.8k +905,817
3 FMR LLC 0.00% of their portfolio BOSTON, MA 794,720794.7k $12.7m $12.7m 0.00% Added +1.3k +1,269
4 VIKING GLOBAL INVESTORS LP 0.02% of their portfolio STAMFORD, CT 524,347524.3k $8.4m $8.4m 0.02% Unchanged
5 TPG GP A, LLC 0.12% of their portfolio FORT WORTH, TX 378,551378.6k $6.1m $6.1m 0.12% Unchanged
6 Nantahala Capital Management, LLC 0.18% of their portfolio NEW CANAAN, CT 376,844376.8k $6.0m $6.0m 0.18% Added +76.2k +76,209
7 Pivotal bioVenture Partners Investment Advisor LLC 1.56% of their portfolio SAN FRANCISCO, CA 300,579300.6k $4.8m $4.8m 1.56% Unchanged
8 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 199,907199.9k $3.2m $3.2m 0.00% Added +43.4k +43,380
9 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 172,497172.5k $2.8m $2.8m 0.00% Added +60.5k +60,457
10 Almitas Capital LLC 0.46% of their portfolio SANTA MONICA, CA 120,682120.7k $1.9m $1.9m 0.46% Reduced -70.5k -70,524
11 Rangeley Capital, LLC 1.56% of their portfolio NEW CANAAN, CT 104,850104.8k $1.7m $1.7m 1.56% Added +74.7k +74,720
12 Mariner, LLC 0.00% of their portfolio Overland Park, KS 50,56650.6k $809.1k $809.1k 0.00% Unchanged
13 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 47,42347.4k $758.8k $758.8k 0.00% New
14 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 32,04732.0k $512.9k $512.9k 0.00% Reduced -3.4k -3,378
15 BlackRock, Inc. 0.00% of their portfolio New York, NY 30,33230.3k $485.3k $485.3k 0.00% Added +12.8k +12,846
16 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 25,65725.7k $410.0k $410.0k 0.00% New
17 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 21,49721.5k $344.0k $344.0k 0.00% Added +10.3k +10,271
18 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 16,82016.8k $269.1k $269.1k 0.00% Added +3.3k +3,273
19 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 16,61916.6k $265.9k $265.9k 0.00% New
20 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 12,99613.0k $207.9k $207.9k 0.00% New
21 Quadrature Capital Ltd 0.00% of their portfolio LONDON, X0 12,99513.0k $207.9k $207.9k 0.00% New
22 DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio AUSTIN, TX 11,28011.3k $180.5k $180.5k 0.00% Unchanged
23 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 1,4421.4k $23.1k $23.1k 0.00% Unchanged
24 Hartford Financial Management Inc. 0.00% of their portfolio WEST HARTFORD, CT 812812 $13.0k $13.0k 0.00% Unchanged
25 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 506506 $8.1k $8.1k 0.00% Reduced -18 -18
26 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 434434 $6.9k $6.9k 0.00% New
27 UBS Group AG 0.00% of their portfolio ZURICH, V8 146146 $2.3k $2.3k 0.00% Reduced -7.8k -7,768
28 Truvestments Capital LLC 0.00% of their portfolio SARASOTA, FL 129129 $2.1k $2.1k 0.00% New
29 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 125125 $2.0k $2.0k 0.00% Reduced -1 -1
30 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 120120 $1.9k $1.9k 0.00% Unchanged
31 Fortitude Family Office, LLC 0.00% of their portfolio SCOTTSDALE, AZ 5353 $848 $848 0.00% Unchanged
32 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 3737 $592 $592 0.00% Unchanged
33 EverSource Wealth Advisors, LLC 0.00% of their portfolio BIRMINGHAM, AL 3131 $496 $496 0.00% New
34 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 99 $145 $145 0.00% Reduced -2.5k -2,488
35 Allworth Financial LP 0.00% of their portfolio FOLSOM, CA 66 $96 $96 0.00% Unchanged
36 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 33 $48 $48 0.00% New
37 DANSKE BANK A/S 0.00% of their portfolio COPENHAGEN V, G7 11 $16 $16 0.00% Unchanged