BOLD Boundless Bio

NASDAQ
$2.66

Boundless Bio (BOLD) 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 1 buyer in the last 90 days 1 seller in the last 90 days
Insiders buying
1
22 transactions
Insiders selling
1
3 transactions
Purchases
$1.5M
611,423 shares
Sales
$134.0K
50,300 shares
Net activity
$1.4M
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 $134.0K 3 transactions · 50,300 shares

Largest single sale: $54.4K.

Where they traded

Buy Sell Dot area is proportional to transaction value.

Last open-market purchase: July 21, 2026 .

Recent open-market activity

Date Insider Role Action Shares Price Value Held after
Sell 18,300 $2.97 $54.4K 2,840,635 −0.6% of holding
Buy 2,975 $2.44 $7.3K 2,858,935
Buy 1,623 $2.44 $4.0K 2,855,960
Buy 265 $2.44 $647 2,854,337
Buy 18,491 $2.44 $45.1K 2,854,072
Buy 1,600 $2.44 $3.9K 2,835,581
Buy 43,878 $2.43 $106.6K 2,833,981
Buy 48,211 $2.42 $116.7K 2,790,103
Buy 43,367 $2.43 $105.4K 2,741,892
Buy 7 $2.48 $17 2,698,525
Buy 14,338 $2.46 $35.3K 2,698,518
Buy 15,810 $2.48 $39.2K 2,684,180
Buy 27,062 $2.49 $67.4K 2,668,370
Buy 9,821 $2.49 $24.5K 2,641,308
Buy 71,612 $2.49 $178.3K 2,631,487
2 fills Sell 32,000 $2.49 $79.7K None left
2 fills Buy 26,030 $2.54 $66.1K 2,559,875
2 fills Buy 64,762 $2.47 $160.0K 2,533,845
2 fills Buy 75,181 $2.55 $191.7K 2,469,083
2 fills Buy 146,390 $2.48 $363.1K 2,393,902

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.