Redmile Group, LLC - 27 Oct 2025 Form 4 Insider Report for ADC Therapeutics SA (ADCT)

Reporting relationship: 10%+ Owner
Issuer ticker: ADCT
Reported as of: 27 Oct 2025
Net transaction value: +$29,999,993
SEC form: 4
Accepted by SEC: 28 Oct 2025, 21:00:10 UTC
Prior SEC filing: 26 Aug 2025
Next SEC filing: 02 Apr 2026
Source filing: View source filing
Reporting owner signature: By: /s/ Jeremy Green, Managing Member of Redmile Group, LLC

Key filing fact

Redmile Group, LLC filed Form 4 for ADC Therapeutics SA (ADCT) on 28 Oct 2025.

Key facts

This page summarizes Redmile Group, LLC's Form 4 filing for ADC Therapeutics SA (ADCT).
2 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 28 Oct 2025, 21:00.

Change

Previous filing in this sequence was filed on 26 Aug 2025.
Current net transaction value: +$29,999,993.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (3)

CIK 0001425738 Primary reporting owner

Redmile Group, LLC

Relationship: 10%+ Owner
Address: ONE LETTERMAN DRIVE, BUILDING D, SUITE D3-300, SAN FRANCISCO
Signature: By: /s/ Jeremy Green, Managing Member of Redmile Group, LLC
Signature date: 28 Oct 2025

CIK 0001650527

Green Jeremy

Relationship: 10%+ Owner
Address: C/O REDMILE GROUP, LLC (NY OFFICE), 45 W. 27TH STREET, FLOOR 11, NEW YORK
Signature: /s/ Jeremy Green, Managing Member of RedCo II (GP), LLC, the General Partner of RedCo II Master Fund, L.P.
Signature date: 28 Oct 2025

CIK 0001921783

RedCo II Master Fund, L.P.

Relationship: 10%+ Owner
Address: C/O REDMILE GROUP, LLC ONE LETTERMAN, DRIVE, BUILDING D SUITE D3-300, SAN FRANCISCO
Signature: /s/ Jeremy Green
Signature date: 28 Oct 2025

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ADCT transaction Derivative

Pre-Funded Warrants

Purchase

Transaction value: $14,999,997
Shares: +3,846,153
Change %
Price: $3.90
Shares after: 3,846,153
Date: 27 Oct 2025
Ownership: See Footnotes
Underlying class: Common Share
Underlying amount: 3,846,153
Exercise price
Footnotes: F1, F2, F3, F4

ADCT transaction Derivative

Pre-Funded Warrants

Purchase

Transaction value: $14,999,997
Shares: +3,846,153
Change %
Price: $3.90
Shares after: 3,846,153
Date: 27 Oct 2025
Ownership: Direct
Underlying class: Common Share
Underlying amount: 3,846,153
Exercise price
Footnotes: F1, F2, F3, F5

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

RedCo II Master Fund, L.P. ("RedCo II") acquired the reported pre-funded warrants to purchase Common Shares (the "Pre-Funded Warrants") in a private placement by the Issuer pursuant to the terms of a securities purchase agreement, dated October 12, 2025 (the "Purchase Agreement"), by and among the Issuer and RedCo II. The purchase price per Pre-Funded Warrants is $3.90, which is the price per Common Share in the private placement minus the exercise price per Pre-Funded Warrant. The closing of the private placement occurred on October 27, 2025 following the satisfaction of the closing conditions.

Footnote F2

The exercise price of the Pre-Funded Warrants is CHF 0.08 per Pre-Funded Warrant Share. Based on the October 12, 2025 exchange rate of approximately $1.25 to CHF 1.00, the exercise price of the Pre-Funded Warrants in US Dollars as of October 12, 2025 was approximately $0.10.

Footnote F3

The Pre-Funded Warrants are exercisable by the holder at any time on or after the closing date of the private placement until the tenth anniversary of such closing date, subject to a 9.99% beneficial ownership blocker. At any time during the last 90 days of the term of the Pre-Funded Warrants, the holder thereof may exchange a Pre-Funded Warrant with the Issuer for a new Pre-Funded Warrant to purchase the number of Pre-Funded Warrant Shares then remaining under such Pre-Funded Warrant, with a subsequent ten-year exercise period.

Footnote F4

These reported securities are directly owned by RedCo II. Redmile Group, LLC ("Redmile") may be deemed to beneficially own the reported securities as the investment manager of RedCo II. The reported securities may also be deemed beneficially owned by Jeremy Green as the principal of Redmile. Redmile and Mr. Green disclaim beneficial ownership of the reported securities except to the extent of its and his respective pecuniary interest therein, if any. This report shall not be deemed an admission that Redmile or Mr. Green is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

Footnote F5

These reported securities are directly owned by RedCo II and this transaction is a repetition of the same transaction disclosed in the row above to disclose this fund's direct ownership.