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Disclosery

RLYB RALLYBIO CORP

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COM (common), issuer CIK 1739410

36 managers (38 13F filers) reported a position in RLYB shares at 2026-03-31, 4,666,407 shares in all. 35 filers opened a position and 1 filer sold out during the quarter.

Managers
36
13F filers
38
New
35
Added
0
Reduced
0
Sold out
1
Shares held by filers
4,666,407

Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.

13D and 13G filers

No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.

Insider trades

The latest Form 4 transactions, non-derivative.
OwnerDateSharesPriceFiling
Uden Stephendirector, officer (Chief Executive Officer)2026-10-06+22,456 M$6.08Form 4

13F holders, Q1 2026

Filers in the available 13F reports with a share position at 2026-03-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.

HolderSharesValue% of portfolioChangeSource
FMR LLCin group FMR LLC793,451$7.12M<0.01%new13F-HRTimelineGroup
VIKING GLOBAL INVESTORS LPin group VIKING GLOBAL INVESTORS LP524,347$4.7M0.01%new13F-HRTimelineGroup
Cormorant Asset Management, LP400,000$3.59M0.18%new13F-HRTimeline
TPG GP A, LLCin group TPG GP A, LLC378,551$3.4M0.09%new13F-HRTimelineGroup
Balyasny Asset Management L.P.in group Balyasny Asset Management376,573$3.38M0.01%new13F-HRTimelineGroup
Laurion Capital Management LP302,756$2.72M0.25%new13F-HRTimeline
Nantahala Capital Management, LLCin group Nantahala Capital Management,…300,635$2.7M0.17%new13F-HRTimelineGroup
Pivotal bioVenture Partners Investment …in group Pivotal bioVenture Partners I…300,579$2.7M0.96%new13F-HRTimelineGroup
5AM Venture Management, LLC291,788$2.62M0.73%new13F-HRTimeline
Almitas Capital LLC191,206$1.72M0.39%new13F-HRTimeline
RENAISSANCE TECHNOLOGIES LLC156,527$1.4M<0.01%new13F-HRTimeline
JOHNSON & JOHNSONin group JOHNSON & JOHNSON152,901$1.37M0.21%new13F-HRTimelineGroup
VANGUARD GROUP INCgroup of 3 filers holding127,029$1.14MnewTimeline
AJU IB Investment Co., Ltd.94,334$846K2.77%new13F-HRTimeline
Mariner, LLCin group Mariner, LLC50,566$454K<0.01%new13F-HRTimelineGroup
GEODE CAPITAL MANAGEMENT, LLCin group GEODE CAPITAL MANAGEMENT, LLC35,425$318K<0.01%new13F-HRTimelineGroup
DELTEC ASSET MANAGEMENT LLC33,750$303K0.06%new13F-HRTimeline
Rangeley Capital, LLC30,130$270K0.29%new13F-HRTimeline
GTS SECURITIES LLC22,016$197K0.01%new13F-HRTimeline
ADAR1 Capital Management, LLCin group ADAR1 Capital Management, LLC20,535$184K0.01%new13F-HRTimelineGroup
CITADEL ADVISORS LLCin group CITADEL ADVISORS LLC19,886$178K<0.01%new13F-HRTimelineGroup
BlackRock, Inc.in group BlackRock, Inc.17,486$157K<0.01%new13F-HRTimelineGroup
DIMENSIONAL FUND ADVISORS LPin group DIMENSIONAL FUND ADVISORS LP11,280$101K<0.01%new13F-HRTimelineGroup
XTX Topco Ltdin group XTX Topco Ltd11,226$101K<0.01%new13F-HRTimelineGroup
ACADIAN ASSET MANAGEMENT LLCin group ACADIAN ASSET MANAGEMENT LLC10,433$92K<0.01%new13F-HRTimelineGroup
UBS Group AGin group UBS Group AG7,914$71K<0.01%new13F-HRTimelineGroup
JPMORGAN CHASE & COin group JPMORGAN CHASE & CO2,497$20.1K<0.01%new13F-HR/ATimelineGroup
Tower Research Capital LLC (TRC)in group Tower Research Capital LLC (T…907$8.14K<0.01%new13F-HRTimelineGroup
Hartford Financial Management Inc.812$7.28K<0.01%new13F-HRTimeline
SBI Securities Co., Ltd.524$4.7K<0.01%new13F-HRTimeline
MORGAN STANLEYin group MORGAN STANLEY126$1.13K<0.01%new13F-HRTimelineGroup
BNP PARIBAS FINANCIAL MARKETSin group BNP PARIBAS FINANCIAL MARKETS120$1.08K<0.01%new13F-HRTimelineGroup
Fortitude Family Office, LLC53$475<0.01%new13F-HRTimeline
WELLS FARGO & COMPANY/MNin group WELLS FARGO & COMPANY/MN37$332<0.01%new13F-HR/ATimelineGroup
Allworth Financial LP6$54<0.01%new13F-HRTimeline
DANSKE BANK A/S1$9<0.01%new13F-HRTimeline

Events

  • Uden Stephen acquired 22,456 RLYB shares on 2026-10-06, Form 4 filed 2026-10-08. 0001193125-26-418051

    Accepted , ingested