RLYB Rallybio Corporation

NASDAQ
$16.62

Rallybio Corporation (RLYB) Insider Activity

What the officers, directors and large holders did with their own shares. Only open-market purchases and sales count toward the totals — grants, option exercises and shares withheld for tax are compensation mechanics, not decisions, and they're listed separately below.

30D 90D 6M 1Y
Insider signal Bullish Insiders bought more than they sold over this window — uncommon at any size.
Cluster activity 0 buyers in the last 30 days 0 buyers in the last 90 days 0 sellers in the last 90 days
Insiders buying
1
14 transactions
Insiders selling
1
1 transaction
Purchases
$4.2M
302,473 shares
Sales
$4.0K
789 shares
Net activity
$4.2M
purchases less sales

How much of that selling was preplanned? 0% planned / 100% discretionary

10b5-1 plan sales $0 0 transactions · 0 shares
Discretionary sales $4.0K 1 transaction · 789 shares

Largest single sale: $4.0K.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: May 19, 2026 .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
2 fills Buy 10,200 $13.98 $142.6K 926,352
Buy 6,009 $13.98 $84.0K 916,152
2 fills Buy 300 $13.90 $4.2K 910,143
2 fills Buy 79,259 $13.99 $1.1M 909,843
Buy 800 $13.83 $11.1K 830,584
3 fills Buy 50,000 $14.00 $700.0K 829,784
Buy 35,101 $14.00 $491.3K 779,784
2 fills Buy 120,804 $13.97 $1.7M 744,683
Lieber Jonathan I Chief Financial Officer Sell 789 $5.06 $4.0K 4,115 −16.1% of holding

Form 4s are due within two business days of a transaction, so this is close to real time — unlike the quarterly 13F data on the Institutional tab. A single large sale often reflects a prearranged 10b5-1 plan rather than a fresh view, so read a pattern of sales rather than any one of them.