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Rallybio Corp

RLYB Net buying

CIK 0001739410 #4404 in the set updated 17 Sep 2026

Bought (120 mo)

$43.57M

out of their own pocket, the only kind of buying there is

Sold (120 mo)

$13.47M

$0.00 on a plan · $0.00 straight out of an exercise

Sold at will

$13.47M

15 of 15 sales

Net

+$30.09M

+$30.09M against sales at will

By person

14 insiders · 47 transactions

Insider

Role

Bought

Sold

Net

Holding

Worth

Change

VIKING GLOBAL INVESTORS LP entity

10% owner

$10.48M (1)

—

+$10.48M

4,194,777

$57.89M

—

Hopfner Robert Lorne

Director

$7.50M (1)

—

+$7.50M

2,267,411

$31.29M

—

ADAR1 Capital Management, LLC entity

10% owner

$4.23M (14)

—

+$4.23M

926,352

$12.78M

+48.5%

HUNT RONALD

Director

$4.00M (2)

—

+$4.00M

2,301,603

$31.76M

—

5AM Opportunities I, L.P.

10% owner

$8.00M (1)

$5.92M (6)

+$2.08M

5,263,595

$72.64M

+3.0%

PARMAR KUSH

Director

$8.00M (1)

$6.74M (7)

+$1.26M

6,569,693

$90.66M

+123.5%

SHANNON TIMOTHY M

Director

$1,000.00K (1)

—

+$1,000.00K

2,409,712

$33.25M

—

5AM Partners V, LLC entity

10% owner

—

$820.00K (1)

−$820.00K

2,378,969

$32.83M

−4.0%

Fryer Jeffrey M

See Remarks

$130.37K (4)

—

+$130.37K

47,048

$649.26K

—

MACKAY MARTIN

Director

$103.47K (2)

—

+$103.47K

719,126

$9.92M

—

Uden Stephen

Chief Executive Officer

$98.50K (3)

—

+$98.50K

719,127

$9.92M

—

Lieber Jonathan I

Chief Financial Officer

$26.05K (1)

$3.99K (1)

+$22.06K

4,115

$56.79K

—

FMR LLC entity

See Remark 1

—

1,694,388

$23.38M

—

Boudreau Helen M

Director

—

6,542

$90.28K

+119.5%

No percentages here. This company's share count has moved by a factor of 8.0 over the window, from 5,289,675 to 42,243,774 shares. A split, a merger or a large issue changes what the company is, and a holding measured at one point in that run is not a fraction of it at another.

Individual transactions

Insider

Date

Role

Action

Price

Amount

Boudreau Helen M

6 Jul 2026

Director

Exercised, kept

3,562

$2.38

$8.48K

Show all 47 transactions →

What was left out

Form 4 filings counted 94

Amendments (4/A) skipped 0

Filings about a different issuer 0

Unreadable filings 0

Joint filings 11

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 0

Sales at will 15

Transactions with no price 0

Shares from compensation/vesting 16,813,033

Sales filed before the plan box existed 14

History held since 2 Aug 2021