Aaron Kantoff - 05 Sep 2025 Form 4 Insider Report for Tourmaline Bio, Inc. (TRML)

Reporting relationship: Director
Issuer ticker: TRML
Reported as of: 05 Sep 2025
Net transaction value: +$99,526
SEC form: 4
Accepted by SEC: 09 Sep 2025, 18:00:06 UTC
Prior SEC filing: 18 Jun 2025
Next SEC filing: 24 Oct 2025
Source filing: View source filing
Reporting owner signature: /s/ Brad Middlekauff, Attorney-in-Fact

Key filing fact

Aaron Kantoff filed Form 4 for Tourmaline Bio, Inc. (TRML) on 09 Sep 2025.

Key facts

This page summarizes Aaron Kantoff's Form 4 filing for Tourmaline Bio, Inc. (TRML).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 09 Sep 2025, 18:00.

Change

Previous filing in this sequence was filed on 18 Jun 2025.
Current net transaction value: +$99,526.

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 (1)

CIK 0001862734 Primary reporting owner

KANTOFF AARON

Relationship: Director
Address: C/O TOURMALINE BIO, INC., 27 WEST 24TH STREET, SUITE 702, NEW YORK
Signature: /s/ Brad Middlekauff, Attorney-in-Fact
Signature date: 09 Sep 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

TRML transaction

Common Stock

Options Exercise

Transaction value: $4,926
Shares: +37,890
Change %: +83%
Price: $0.1300
Shares after: 83,281
Date: 05 Sep 2025
Ownership: Direct

TRML transaction

Common Stock

Options Exercise

Transaction value: $94,600
Shares: +10,000
Change %: +12%
Price: $9.46
Shares after: 93,281
Date: 05 Sep 2025
Ownership: Direct

Reported derivative securities

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

TRML transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -37,890
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 05 Sep 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 37,890
Exercise price: $0.1300
Footnotes: F1

TRML transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value: $0
Shares: -10,000
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 05 Sep 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 10,000
Exercise price: $9.46
Footnotes: F1

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

The shares subject to the option are fully vested and immediately exercisable.

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