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

Aktis Oncology, Inc.

Healthcare · Biotechnology

21.90$ -4.3% vs. previous close Closing price · As of: Sep 18, 2026

Ownership

Ownership Structure

Who owns Aktis Oncology, Inc. (AKTS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 53.2% of the shares are freely tradable; institutional investors hold 74.2%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 74.2%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 14.1%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 53.2%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 19.6%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 54Mio.

Largest Shareholders

Institutions

Institutions AKTS
Name Stake (%) Shares Change (%) Date
MPM Oncology Impact Management LP 8.69 4,835,872 +0.0 06/30/2026
EcoR1 Capital, LLC 8.67 4,824,469 +0.0 06/30/2026
Blue Owl Capital Holdings LP 5.52 3,070,219 -2.9 06/30/2026
T. Rowe Price Investment Management,Inc. 3.82 2,123,812 +0.0 03/31/2026
BlackRock Inc 3.80 2,112,127 +0.0 03/31/2026
Wellington Management Company LLP 3.54 1,966,244 -15.1 06/30/2026
RTW INVESTMENTS, LLC 2.86 1,592,043 +0.0 03/31/2026
T. Rowe Price Associates, Inc. 2.81 1,564,196 +0.0 03/31/2026
RA Capital Management, LLC 2.70 1,503,084 +0.0 03/31/2026

Funds

Funds AKTS
Name Stake (%) Shares Change (%) Date
Vanguard Health Care Inv 3.51 1,953,344 -3.5 06/30/2026

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

Insiders

Insider Transactions

Insider Transactions
Date Person Role Type Shares Price Value
Jul 20, 2026 Herrmann Ken Director Sell 1,350 24.56 33,159
Jul 20, 2026 Herrmann Ken Director Sell 3,506 24.56 86,115
Jul 20, 2026 Herrmann Ken Director Other 1,350 1.91 2,579
Jul 20, 2026 Herrmann Ken Director Other 3,506 0.08 280
Jul 17, 2026 Herrmann Ken Director Sell 3,065 25.21 77,259
Jul 17, 2026 Herrmann Ken Director Other 3,065 0.08 245

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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