Public ownership evidence

Boundless Bio, Inc. Common Stock (BOLD) Ownership Disclosures

Read BOLD insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Boundless Bio, Inc. Common Stock: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-08-29
Trade date
2026-08-26
Reporting owners
TANG CAPITAL MANAGEMENT LLC, TANG KEVIN
Code
S
Shares
18,300
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001178579-26-000018
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read BOLD fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read BOLD fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity
2026-08-292026-08-26TANG CAPITAL MANAGEMENT LLC, TANG KEVINS18,300Not reported
2026-07-222026-07-21TANG CAPITAL MANAGEMENT LLC, TANG KEVINP2,975Not reported
2026-07-222026-07-20TANG CAPITAL MANAGEMENT LLC, TANG KEVINP1,623Not reported
2026-07-222026-07-17TANG CAPITAL MANAGEMENT LLC, TANG KEVINP265Not reported
2026-07-172026-07-16TANG CAPITAL MANAGEMENT LLC, TANG KEVINP18,491Not reported
2026-07-172026-07-15TANG CAPITAL MANAGEMENT LLC, TANG KEVINP1,600Not reported
2026-07-172026-07-14TANG CAPITAL MANAGEMENT LLC, TANG KEVINP43,878Not reported
2026-07-142026-07-13TANG CAPITAL MANAGEMENT LLC, TANG KEVINP48,211Not reported
2026-07-142026-07-10TANG CAPITAL MANAGEMENT LLC, TANG KEVINP43,367Not reported
2026-07-142026-07-09TANG CAPITAL MANAGEMENT LLC, TANG KEVINP7Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

Ensign Peak Advisors, Inc2026-03-312026-08-19187,500$206,250None
Ensign Peak Advisors, Inc2025-12-312026-08-19187,500$225,000None
Ensign Peak Advisors, Inc2025-09-302026-08-19187,500$230,625None
Pure Financial Advisors, LLC2026-06-302026-08-1810,100$25,250None
Stonepine Capital Management, LLC2026-06-302026-08-18154,595$386,488None
ADAR1 Capital Management, LLC2026-06-302026-08-151,968,216$4,920,540None
SUPERSTRING CAPITAL MANAGEMENT LP2026-06-302026-08-1555,356$138,390None
Rangeley Capital, LLC2026-06-302026-08-1574,000$185,000None
XTX Topco Ltd2026-06-302026-08-1533,361$83,403None
Qube Research & Technologies Ltd2026-06-302026-08-1520,207$50,518None
JANE STREET GROUP, LLC2026-06-302026-08-1518,453$46,132None
JANE STREET GROUP, LLC2026-06-302026-08-1545,870$114,675None
Cormorant Asset Management, LP2026-06-302026-08-151,000,000$2,500,000None
HRT FINANCIAL LP2026-06-302026-08-15116,288$290,000None
Ensign Peak Advisors, Inc2026-06-302026-08-15159,835$399,588None
Stonepine Capital Management, LLC2026-06-302026-08-15154,595$386,488None
MILLENNIUM MANAGEMENT LLC2026-06-302026-08-15478,639$1,196,598None
TANG CAPITAL MANAGEMENT LLC2026-06-302026-08-152,559,875$6,399,688None
Alyeska Investment Group, L.P.2026-06-302026-08-15300,000$750,000None
BRIDGEWAY CAPITAL MANAGEMENT, LLC2026-06-302026-08-15128,000$320,000None
CITADEL ADVISORS LLC2026-06-302026-08-15145,049$362,623None
RBF Capital, LLC2026-06-302026-08-15200,000$500,000None
ARCH Venture Management, LLC2026-06-302026-08-152,694,095$6,735,238None
PRELUDE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1583,998$209,995None
WELLINGTON MANAGEMENT GROUP LLP2026-06-302026-08-15556,233$1,390,583None
VANGUARD CAPITAL MANAGEMENT LLC2026-06-302026-08-14614,923$1,537,308None
UBS Group AG2026-06-302026-08-142$5None
BNP PARIBAS FINANCIAL MARKETS2026-06-302026-08-14176$440None
ACADIAN ASSET MANAGEMENT LLC2026-06-302026-08-14146,757$365,000None
RENAISSANCE TECHNOLOGIES LLC2026-06-302026-08-14471,570$1,178,925None
Affinity Asset Advisors, LLC2026-06-302026-08-14250,000$625,000None
VANGUARD FIDUCIARY TRUST CO2026-06-302026-08-1465,136$162,840None
MORGAN STANLEY2026-06-302026-08-1413,000$32,500None
FMR LLC2026-06-302026-08-144,992$12,480None
FMR LLC2026-06-302026-08-141,243,083$3,107,708None
FMR LLC2026-06-302026-08-141,332,980$3,332,450None
NORTHERN TRUST CORP2026-06-302026-08-1434,824$87,060None
GEODE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1320,683$51,707None
GEODE CAPITAL MANAGEMENT, LLC2026-06-302026-08-1396,053$240,132None
JPMORGAN CHASE & CO2026-06-302026-08-13169$414None
JPMORGAN CHASE & CO2026-06-302026-08-1310$25None
Tower Research Capital LLC (TRC)2026-06-302026-08-12348$870None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-1250$125None
BlackRock, Inc.2026-06-302026-08-0825,555$63,888None
BlackRock, Inc.2026-06-302026-08-0858,851$147,128None
BlackRock, Inc.2026-06-302026-08-084,089$10,223None
STATE STREET CORP2026-06-302026-08-0815,962$39,905None
GSA CAPITAL PARTNERS LLP2026-06-302026-08-0772,353$181,000None
Caitong International Asset Management Co., Ltd2026-06-302026-08-0610,443$26,108None
China Universal Asset Management Co., Ltd.2026-06-302026-07-2516,900$42,250None

90-day public filing window, up to 50 source positions.

Ensign Peak Advisors, Inc ↗Ensign Peak Advisors, Inc ↗Ensign Peak Advisors, Inc ↗Pure Financial Advisors, LLC ↗Stonepine Capital Management, LLC ↗ADAR1 Capital Management, LLC ↗SUPERSTRING CAPITAL MANAGEMENT LP ↗Rangeley Capital, LLC ↗XTX Topco Ltd ↗Qube Research & Technologies Ltd ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

Aurora · AI research assistant

Try this in Aurora

Edit the request, then open it in Aurora. You choose when to send it.