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Buy Day today: Neutral (51) Mixed market breadth · no major macro event
ANAB

AnaptysBio Inc

Healthcare · Biotechnology

55.20$ +0.3% vs. previous close Closing price · As of: Sep 18, 2026

Ownership

Ownership Structure

Who owns AnaptysBio Inc (ANAB)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 66.8% of the shares are freely tradable; institutional investors hold 104.2%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 104.2%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 5.8%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 66.8%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 40.7%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 30Mio.

Largest Shareholders

Institutions

Institutions ANAB
Name Stake (%) Shares Change (%) Date
EcoR1 Capital, LLC 26.61 7,880,094 +0.0 06/30/2026
BlackRock Inc 5.68 1,681,380 -3.1 03/31/2026
TANG CAPITAL MANAGEMENT LLC 4.49 1,330,879 -0.1 03/31/2026
Morgan Stanley - Brokerage Accounts 3.36 993,905 -3.9 03/31/2026
State Street Corp 3.35 992,445 -5.8 03/31/2026
Vanguard Capital Management, LLC 2.88 853,151 +0.0 03/31/2026
Affinity Asset Advisors, LLC 2.79 826,109 -12.1 06/30/2026
Sanofi 2.78 821,917 +0.0 06/30/2026
Millennium Management LLC 2.73 807,316 +69.8 06/30/2026

Funds

Funds ANAB
Name Stake (%) Shares Change (%) Date
State Street® SPDR® S&P® Biotech ETF 2.80 830,004 -1.1 08/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Insider holdings

Insider holdings ANAB
Person Role Shares Value As of Type
Orwin John A Director 17,995 993,324 $ Sep 15, 2026 direct

Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Sep 15, 2026 Orwin John A Director Other 1,300 0.00 –

Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →

Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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