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.

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
0
0 transactions
Purchases
$4.2M
302,473 shares
Sales
$0
0 shares
Net activity
$4.2M
purchases less sales

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

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.