BOLD

Boundless Bio Inc Cross-source read
Health CareUSCUSIP 10170A100

Among active 13F managers last quarter, 5 opened and 3 added, while 7 reduced; the largest holder to move was ARCH Venture Management, LLC (new position). Over the last 180 days, 1 insider bought and 3 insiders sold, a net +$1.4M in open-market trades.

Tracked 13F holders
32
10 in Q2 2026 filings
13F value (tracked)
$13.3M
13F moves · latest Q
8 added
7 reduced
Insider net · 180d
$1.4M
1 buying · 3 selling
Smart-money sentimentMixed
Net sellingNet buying

Funds split, 8 adding vs 7 trimming; insiders net bought $1.4M.

Who owns BOLD?

32 tracked 13F filers · ranked by shares held

32 tracked 13F filers disclose a position in BOLD as of the latest SEC 13F filings, a combined $13.3M in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

#FundSharesPosition valueLast moveAs ofHistory
1FMR LLC2.7M
$3.0M
+0.4%
Added · +11K sh
Q1 2026
2ARCH Venture Management, LLC2.7M
$6.7M
New
+2.7M sh
Q2 2026
3Vanguard Capital Management LLC597K
$657K
New filer
Inherited book · not a new buyer
Q1 2026
4Renaissance Technologies LLC399K
$439K
+17%
Added · +58K sh
Q1 2026
5Alyeska Investment Group, L.P.300K
$330K
Held
Q1 2026
6Ensign Peak Advisors, Inc160K
$400K
−15%
Reduced · −28K sh
Q2 2026
7Stonepine Capital Management, LLC155K
$386K
−74%
Reduced · −443K sh
Q2 2026
8Citadel Advisors LLC145K
$363K
−89%
Reduced · −1.2M sh
Q2 2026
9Geode Capital Management, LLC117K
$292K
−8.5%
Reduced · −11K sh
Q2 2026
10Millennium Management LLC100K
$110K
−26%
Reduced · −36K sh
Q1 2026
11BlackRock, Inc.71K
$78K
+5.4%
Added · +4K sh
Q1 2026
12Vanguard Fiduciary Trust Co65K
$72K
New filer
Inherited book · not a new buyer
Q1 2026
13Superstring Capital Management LP55K
$138K
New
+55K sh
Q2 2026
14Bridgeway Capital Management, LLC51K
$56K
Held
Q1 2026
15XTX Topco Ltd35K
$38K
−12%
Reduced · −5K sh
Q1 2026
16Qube Research & Technologies Ltd17K
$19K
−6.5%
Reduced · −1K sh
Q1 2026
17China Universal Asset Management Co., Ltd.17K
$42K
New
+17K sh
Q2 2026
18Squarepoint Ops LLC16K
$18K
New
+16K sh
Q1 2026
19State Street Corp16K
$40K
Held
Q2 2026
20Morgan Stanley13K
$14K
Held
Q1 2026
21Caitong International Asset Management Co., Ltd10K
$26K
3k×
Added · +10K sh
Q2 2026
22Pure Financial Advisors, LLC10K
$25K
Held
Q2 2026
23Citigroup Inc9K
$10K
−65%
Reduced · −16K sh
Q1 2026
24Tower Research Capital LLC (TRC)2K
$3K
−59%
Reduced · −3K sh
Q1 2026
25Vanguard Global Advisers, LLC429
$472
New filer
Inherited book · not a new buyer
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

Is BOLD being bought or sold by institutions?

Last quarter, 5 funds opened a new position in BOLD and 3 added to an existing one, while 7 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened
5
funds, first position
Added
3
funds, existing position
Reduced
7
funds, still holding
Largest positions that changed · ranked by position value

Funds that own BOLD also own

CompanyCo-held byCombined value
NVIDIA CORPNVDA14 funds$12.7B
ALPHABET INC-CL AGOOGL14 funds$5.3B
JPMORGAN CHASE & COJPM14 funds$3.2B
CHEVRON CORPCVX14 funds$2.1B
ADVANCED MICRO DEVICESAMD14 funds$1.9B
AMPHENOL CORP-CL AAPH14 funds$1.4B
AUTOMATIC DATA PROCESSINGADP14 funds$604.7M
IDEXX LABORATORIES INCIDXX14 funds$359.5M
APPLE INCAAPL13 funds$9.2B
MICROSOFT CORPMSFT13 funds$7.0B
AMAZON.COM INCAMZN13 funds$6.8B
MICRON TECHNOLOGY INCMU13 funds$6.1B

Ranked by how many of BOLD's institutional holders also hold each name, a cross-fund conviction signal.

Insider activity (Form 4)

Full insider page →
Buys · 180d
$1.5M
1 insiders
Sells · 180d
$134K
3 insiders
Net
$1.4M
25 P/S txns
Signal
Net Buying
open-market
DateInsiderRoleActionSharesValue
Aug 26, 2026TANG KEVIN10% OwnerSell (S)18K$54K
Jul 21, 2026TANG KEVIN10% OwnerBuy (P)3K$7K
Jul 20, 2026TANG KEVIN10% OwnerBuy (P)2K$4K
Jul 17, 2026TANG KEVIN10% OwnerBuy (P)265$647
Jul 16, 2026TANG KEVIN10% OwnerBuy (P)18K$45K
Jul 15, 2026TANG KEVIN10% OwnerBuy (P)2K$4K
Jul 14, 2026TANG KEVIN10% OwnerBuy (P)44K$107K
Jul 13, 2026TANG KEVIN10% OwnerBuy (P)48K$117K
Jul 10, 2026TANG KEVIN10% OwnerBuy (P)43K$105K
Jul 9, 2026TANG KEVIN10% OwnerBuy (P)7$17
Jul 8, 2026TANG KEVIN10% OwnerBuy (P)14K$35K
Jul 7, 2026TANG KEVIN10% OwnerBuy (P)16K$39K

Do institutions, insiders and Congress agree?

Mixed signals

Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.

SEC EDGAR 13F + Form 4 + US House STOCK Act{ }get_ticker_confluence · API & MCP

Signals by source

Insiders and Congress: last 180 days. Funds: latest 13F

SourceBuyingSellingNet
13F funds
Latest quarterly filings
611
Insiders
Form 4 open-market
13+$1.4M
US House
STOCK Act trades
00$0
Sector rotation
BOLD is in Health Care, which smart money is rotating OUT OF
$4.1B

Capital Rotation reports where institutional capital DISCLOSED rotating, as of the latest public SEC 13F filings. It is DATA, NOT investment advice, a recommendation, or a prediction. Filings lag ~45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.

Institutional ownership over time

10 funds-30 since Q3 2024
02244Q3 2024Q1 2025Q3 2025Q1 2026Q2 2026
funds holding aggregate valuelatest $7.7M

Recent filings

15 shown

Keep exploring

Connected entities for BOLD

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Ask your agent what changed in BOLD

This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/BOLD/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for BOLD.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for BOLD. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.