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BOLD · Boundless Bio, Inc.

Everything on this page is public record — SEC Form 4 filings and congressional disclosures — alongside any INSIDER SCANNER research case for this company.

Open-market buys4
Open-market sells0
Total purchased$349,593
Unique insiders buying1
Avg price paid$2.34
Research cases0
Last filing2026-10-20

Average price paid is weighted by shares, so a large purchase counts for more than a small one. It is what insiders reported paying, not a target or a fair value.

Insider flow: Buying only — a count of disclosed transactions, not a rating or a recommendation.

Insider transaction timeline

Every reported transaction, positioned by trade date. Purchases sit above the axis, sales below; circle area is proportional to dollar value. No share-price line is drawn — this feed carries transaction prices only, and a price history inferred from them would imply market data the filings do not contain.

Open-market purchase Open-market sale
2026-10-16 — TANG KEVIN · bought 118,185 @ $2.34 2026-10-19 — TANG KEVIN · bought 12,790 @ $2.34 2026-10-19 — TANG KEVIN · bought 18,279 @ $2.33 2026-10-20 — TANG KEVIN · bought 220 @ $2.37
2026-10-162026-10-20

Insider cost basis

Share-weighted average price across 4 reported purchases, with the full range of prices paid. Purchases only — averaging a sale into an "insider cost" would describe a price nobody paid.

$2.33 $2.37
$2.34 weighted average insider purchase price

Insider participation

One row per insider, one cell per reported transaction, shaded by value. Repeat buying and activity clustered in time are visible at a glance.

TANG KEVIN 10% owner
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The analysis built on top of these filings

The filings above are public record and stay public here. What an account adds for $BOLD is the reading of them — and for this company, that is what the list below says it is, no more.

  • Insider cost basisShare-weighted average price paid across the 4 reported purchases, with the full range, against the current price.
  • Insider participationWho bought, how often, and how the buying is distributed across the people filing — one person repeating is not several agreeing.
  • Transaction timelineThe [{'transaction_date': '2026-10-20', 'insider_name': 'TANG KEVIN', 'insider_title': '10% owner', 'transaction_type': 'Open-market buy', 'shares': 220.0, 'price': 2.37, 'value': 521.4, 'is_buy': True}, {'transaction_date': '2026-10-19', 'insider_name': 'TANG KEVIN', 'insider_title': '10% owner', 'transaction_type': 'Open-market buy', 'shares': 12790.0, 'price': 2.34, 'value': 29928.6, 'is_buy': True}, {'transaction_date': '2026-10-19', 'insider_name': 'TANG KEVIN', 'insider_title': '10% owner', 'transaction_type': 'Open-market buy', 'shares': 18279.0, 'price': 2.33, 'value': 42590.07, 'is_buy': True}, {'transaction_date': '2026-10-16', 'insider_name': 'TANG KEVIN', 'insider_title': '10% owner', 'transaction_type': 'Open-market buy', 'shares': 118185.0, 'price': 2.34, 'value': 276552.9, 'is_buy': True}] reported transactions plotted over the window rather than listed, so concentration is visible.

Not available for BOLD today: no research case — nothing here has cleared the scoring threshold. Both appear on this page on their own if that changes.

A free account opens all of it.

Not financial advice. This page reports public filings and past research output. It is not a recommendation to buy or sell, and no price target here is a prediction. Trade at your own risk.