Transaction · 0001178579-26-000019

Tang Kevin

TANG KEVIN, 10%, reported an open-market or private purchase at Boundless Bio, Inc. involving 118185.000000 shares for an estimated $276552.90. Reported holdings after the transaction were 2958820.000000 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market buySEC transaction code P10%
BOLDBoundless Bio, Inc.
Trade date
Oct 16, 2026
Filing date
Oct 20, 2026
View on SEC Insider profile
Estimated value$276kShares × reported price
Shares traded118k$2.34 per share
Holdings after2.95MIndirect · See Footnote
% of reported position traded4.16%This security and ownership context
How reported position traded is calculated

Shares purchased ÷ (holdings after − shares purchased). Estimated position before: 2,840,635 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

BOLD price since this filing

Daily closing prices, with the filing date and available return windows
BOLD · Daily closing priceLoading daily prices…
Filing dateReturn windows appear as prices become available.
Pre-filing1mo ago +6.0%1w ago +0.0%1d ago +0.0%
Returns since7d30d90d180d1y

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Buy
Code P
Identifier
0001178579-26-000019
Common Stock
Transaction date
Oct 16, 2026
Filed Oct 20, 2026, 09:49 PM · 4d delay
Shares
118,185 sh
$2.34 per share
Estimated value
$276k
Computed from shares × price
Holdings after
2,958,820 sh
Indirect · See Footnote

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Cluster Buy 10% Owner Buy
Filing-only score

+30 points

Compact filing score computed from stored Form 4 facts. Version v1.

Strong filing signal

This filing has a high positive filing-only score. It may deserve closer research, but it is not an investment recommendation.

How this score is calculated
  • open_market_purchase+12 points

    transaction_code = P

    Code P is a discretionary open-market purchase.
  • ten_percent_owner_buy+4 points

    is_ten_percent_owner = true

    10% beneficial owner open-market purchase.
  • cluster_buy+14 points

    cluster-buy signal matched

    Multiple insiders bought within the configured window.
Read the scoring methodology

Signed filing-only points, not a probability or expected return. Version v1.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

No officer title

Officer NoDirector No10% YesOther No
Footnotes & amended
  1. F1

    The Reporting Persons have delivered to the Issuer the full amount of the disgorgeable profit arising the purchases reported herein, in the amount of $1,723.10.

  2. F2

    The prices reported are weighted-average prices. These shares were purchased in multiple transactions at prices ranging from $2.31 to $2.35. The Reporting Persons undertake to provide the Issuer, any…

  3. F3

    Tang Capital Partners, LP ("TCP") beneficially owns 688,494 shares, Tang Capital Partners International, LP ("TCPI") beneficially owns 937,213 shares, Tang Capital Partners III, Inc. ("TCP III") benef…

  4. F4

    These shares were purchased in multiple transactions at prices ranging from $2.31 to $2.35.

  5. F5

    These shares were purchased in multiple transactions at prices ranging from $2.32 to $2.35.

  6. F6

    These shares were purchased in multiple transactions at prices ranging from $2.33 to $2.40.

Original filing · 0001178579-26-000019
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