Boundless Bio Insider Trades
NASDAQ: BOLDHealth CareBiotechnology: Pharmaceutical PreparationsUSD
2.57-0.07 (-2.65%)
Market open · Delayed 15 min · as of Oct 8, 3:05 PM ET
Last 12 months
- Purchases
- 22 · $1.52M
- Sales
- 3 · $134.03K
- Shares bought / sold
- 611.42K / 50.30K
- Net activity
- Net buying $1.4 million
Boundless Bio insider activity
Over the last 12 months, Boundless Bio insiders reported 27 transactions on SEC Form 4: 22 open-market purchases and 3 sales. Insiders bought $1.5 million and sold $134,031 worth of stock, for net insider buying of $1.4 million. The largest seller was TANG KEVIN & TANG CAPITAL MANAGEMENT LLC, with $54,351 in reported sales.
The most recent filing shows TANG KEVIN & TANG CAPITAL MANAGEMENT LLC (10% Owner) selling 18,300 shares at $2.97 on Aug 26, 2026. Insider sales are common for compensation, tax and diversification reasons, while open-market purchases are rarer; tracking both helps put BOLD's ownership changes in context.
Summary generated from market data by MetaCap's automated system. Methodology
BOLD insider transactions
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Aug 26, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Sale | 18,300 | $54.35K | Form 4 |
| Jul 21, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 2,975 | $7.26K | Form 4 |
| Jul 20, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 1,623 | $3.96K | Form 4 |
| Jul 17, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 265 | $646.60 | Form 4 |
| Jul 16, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 18,491 | $45.12K | Form 4 |
| Jul 15, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 1,600 | $3.90K | Form 4 |
| Jul 14, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 43,878 | $106.62K | Form 4 |
| Jul 13, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 48,211 | $116.67K | Form 4 |
| Jul 10, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 43,367 | $105.38K | Form 4 |
| Jul 9, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 7 | $17.36 | Form 4 |
| Jul 8, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 14,338 | $35.27K | Form 4 |
| Jul 7, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 15,810 | $39.21K | Form 4 |
| Jul 6, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 27,062 | $67.38K | Form 4 |
| Jul 2, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 9,821 | $24.45K | Form 4 |
| Jul 1, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 71,612 | $178.31K | Form 4 |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Sale | 16,000 | $39.84K | Form 4 |
| Jul 1, 2026 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Option exercise | 16,000 | $16.48K | Form 4 |
| Jul 1, 2026 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN & Burow Kristina10% Owner | Sale | 16,000 | $39.84K | Form 4 |
| Jul 1, 2026 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN & Burow Kristina10% Owner | Option exercise | 16,000 | $16.48K | Form 4 |
| Jun 30, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 100 | $250 | Form 4 |
| Jun 30, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 25,930 | $65.86K | Form 4 |
| Jun 29, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 777 | $1.93K | Form 4 |
| Jun 29, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 63,985 | $158.04K | Form 4 |
| Jun 26, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 134 | $340.36 | Form 4 |
| Jun 26, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 75,047 | $191.37K | Form 4 |
| Jun 25, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 510 | $1.31K | Form 4 |
| Jun 25, 2026 | TANG KEVIN & TANG CAPITAL MANAGEMENT LLC10% Owner | Buy | 145,880 | $361.78K | Form 4 |
| Apr 2, 2024 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Buy | 133,333 | $2.13M | Form 4 |
| Apr 2, 2024 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Buy | 66,667 | $1.07M | Form 4 |
| Apr 2, 2024 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Conversion | 1,048,433 | — | Form 4 |
| Apr 2, 2024 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Conversion | 787,545 | — | Form 4 |
| Apr 2, 2024 | ARCH Venture Fund IX, L.P. & ARCH Venture Fund IX Overage, L.P. & ARCH Venture Fund X Overage, L.P. & ARCH Venture Partners IX, L.P. & ARCH Venture Partners IX Overage, L.P. & ARCH Venture Partners X Overage, L.P. & ARCH Venture Partners IX, LLC & ARCH Venture Partners X, LLC10% Owner | Conversion | 589,743 | — | Form 4 |
| Apr 2, 2024 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN10% Owner | Buy | 133,333 | $2.13M | Form 4 |
| Apr 2, 2024 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN10% Owner | Buy | 66,667 | $1.07M | Form 4 |
| Apr 2, 2024 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN10% Owner | Conversion | 1,048,433 | — | Form 4 |
| Apr 2, 2024 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN10% Owner | Conversion | 787,545 | — | Form 4 |
| Apr 2, 2024 | CRANDELL KEITH & BYBEE CLINTON & NELSEN ROBERT & GILLIS STEVEN10% Owner | Conversion | 589,743 | — | Form 4 |
| Apr 2, 2024 | Lim Jonathan EDirector | Conversion | 525,274 | — | Form 4 |
| Apr 2, 2024 | Burow KristinaDirector | Buy | 133,333 | $2.13M | Form 4 |
| Apr 2, 2024 | Burow KristinaDirector | Buy | 66,667 | $1.07M | Form 4 |
| Apr 2, 2024 | Burow KristinaDirector | Conversion | 1,048,433 | — | Form 4 |
| Apr 2, 2024 | Burow KristinaDirector | Conversion | 787,545 | — | Form 4 |
| Apr 2, 2024 | Burow KristinaDirector | Conversion | 589,743 | — | Form 4 |
Transaction codes follow SEC Form 4: P = open-market purchase, S = open-market sale, A = grant or award, M = option exercise, F = shares withheld for taxes. About Form 4