Skip to content

Nasdaq · CIK 0001739410

RLYB Rallybio Corp

Insider trading from SEC Form 4. Last filing 5 d ago. Close $17.02 on Oct 9, 2026, +316% from the 52-week low and -1% from the high.

Rallybio Corp (RLYB) has 21 SEC Form 4 filings on file from 11 insiders, the latest filed on Oct 8, 2026. No insider bought or sold on the open market in the last 90 days; rows filed in that time are grants, exercises, tax withholding and other transactions that carry no view on the price.

5 open-market trades have been scored at RLYB. The newest: ADAR1 Capital Management, LLC (10% owner) bought $227k of stock on May 18, 2026, filed May 20, 2026, scored 25 (weak). The largest of the 5 shown: ADAR1 Capital Management, LLC (10% owner) bought $2.2M on May 4, 2026, scored 38 (weak).

RLYB closed at $17.02 on Oct 9, 2026, 316% above its 52-week low and 1% below its 52-week high.

Last 90 days

Net insider value
$0
no open-market trades
Buys
0
$0 by 0 insiders
Sells
0
$0 by 0 insiders
Insiders on file
11
with a Form 4 at this company

Price and insider trades, last year

RLYBOct 9, 2026 · close 17.02

Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™

Signals

Open-market buys and sells at Rallybio Corp, scored.

ScoreInsiderValueHoldingsPrice contextFiled
25WeakADAR1 Capital Management, LLC
owner
buy
$227k
16,209 shares
+2%-
40ModerateADAR1 Capital Management, LLC
owner
buy
$1.1M
79,559 shares
+10%-
36WeakADAR1 Capital Management, LLC
owner
buy
$711k
50,800 shares
+7%-
38WeakADAR1 Capital Management, LLC
owner
buy
$2.2M
155,905 shares
+25%-
27WeakJonathan I Lieber
Chief Financial Officer
sell
$3,992
789 shares
-16%-

Transactions

Every row filed, 38 in all.

DateInsiderTransactionSharesPriceValueHoldings afterFiled
Oct 6, 2026Stephen Uden
Chief Executive Officer
MOption exercise
Common Stock
+22,456$6.08$137k115,6205 d ago
Oct 6, 2026Stephen Uden
Chief Executive Officer
MOption exercise
Option (Right to Buy)derivative
-22,456$0.00$005 d ago
Sep 29, 2026Jonathan I Lieber
Chief Financial Officer
MOption exercise
Common Stock
+5,000$6.08$30k9,74012 d ago
Sep 29, 2026Jonathan I Lieber
Chief Financial Officer
MOption exercise
Option (Right to Buy)derivative
-5,000$0.00$0012 d ago
Sep 24, 2026Hui Liu
director
MOption exercise
Common Stock
+3,562$2.38$8,4783,56215 d ago
Sep 24, 2026Hui Liu
director
MOption exercise
Common Stock
+8,482$7.60$64k12,04415 d ago
Sep 24, 2026Hui Liu
director
MOption exercise
Option (Right to Buy)derivative
-3,562$0.00$0015 d ago
Sep 24, 2026Hui Liu
director
MOption exercise
Option (Right to Buy)derivative
-8,482$5.60$47k015 d ago
Sep 16, 2026Wendy Chung
director
MOption exercise
Common Stock
+3,562$2.38$8,4783,56225 d ago
Sep 16, 2026Wendy Chung
director
MOption exercise
Option (Right to Buy)derivative
-3,562$0.00$0025 d ago
May 18, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+6,009$13.98$84k916,152May 20, 2026
May 19, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+10,000$13.98$140k926,152May 20, 2026
May 19, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+200$13.80$2,760926,352May 20, 2026
May 13, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+4,081$13.80$56k834,665May 15, 2026
May 13, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+75,178$14.00$1.1M909,843May 15, 2026
May 15, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+100$13.80$1,380909,943May 15, 2026
May 15, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+200$13.95$2,790910,143May 15, 2026
May 11, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+5,100$14.00$71k784,884May 13, 2026
May 11, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+25,000$14.00$350k809,884May 13, 2026
May 11, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+19,900$14.00$279k829,784May 13, 2026
May 12, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+800$13.83$11k830,584May 13, 2026
May 4, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+3,900$13.90$54k627,779May 6, 2026
May 4, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+116,904$13.97$1.6M744,683May 6, 2026
May 5, 2026ADAR1 Capital Management, LLC
owner
POpen-market purchase
Common Stockindirect: See Footnote
+35,101$14.00$491k779,784May 6, 2026
Feb 18, 2026Jonathan I Lieber
Chief Financial Officer
AGrant or award
Common Stock
+2,500$0.00$04,904Feb 23, 2026
Feb 23, 2026Jonathan I Lieber
Chief Financial Officer
SOpen-market sale
Common Stock
-789$5.06$3,9924,115Feb 23, 2026
Feb 18, 2026Ronald Hunt
director
AGrant or award
Option (Right to Buy)derivative
+14,305$3.60$51k14,305Feb 20, 2026
Feb 18, 2026Martin Mackay
director
AGrant or award
Option (Right to Buy)derivative
+18,055$3.60$65k18,055Feb 20, 2026
May 13, 2025Helen M Boudreau
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Paula Soteropoulos
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Christine A Nash
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Martin Mackay
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Hui Liu
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Robert Lorne Hopfner
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Ronald Hunt
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
May 13, 2025Wendy Chung
director
AGrant or award
Option (Right to Buy)derivative
+28,500$0.00$028,500May 15, 2025
Jan 2, 2025Ronald Hunt
director
AGrant or award
Option (Right to Buy)derivative
+73,571$0.70$51k73,571Jan 6, 2025
Jan 2, 2025Robert Lorne Hopfner
director
AGrant or award
Option (Right to Buy)derivative
+73,571$0.70$51k73,571Jan 6, 2025

Insiders

Everyone who has filed a Form 4 here.

Questions about RLYB

Answered from the filings on this page, as of the latest one.

Are insiders buying RLYB?

No. In the last 90 days no insider at Rallybio Corp bought or sold shares on the open market according to SEC Form 4 filings. The rows on file from that period are grants, exercises, tax withholding or other transactions, which carry no view on the price.

Who was the last insider to trade RLYB on the open market?

ADAR1 Capital Management, LLC (10% owner) bought $227k of RLYB on May 18, 2026 and filed the Form 4 on May 20, 2026. InsiderTell scored 25 (weak).

How many insiders file Form 4 at Rallybio Corp?

11 people have filed a Form 4 at Rallybio Corp, among them ADAR1 Capital Management, LLC (10% owner), Helen M Boudreau (director), Wendy Chung (director). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.

Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.

RLYB insider trading: Rallybio Corp | InsiderTell