Sara Bonstein - 02 Jan 2026 Form 4 Insider Report for INSMED Inc (INSM)

Reporting relationship: Chief Financial Officer
Issuer ticker: INSM
Reported as of: 02 Jan 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 06 Jan 2026, 16:08:43 UTC
Prior SEC filing: 07 Oct 2025
Next SEC filing: 08 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Sara Bonstein, by Michael A. Smith as Attorney-in-fact

Key filing fact

Sara Bonstein filed Form 4 for INSMED Inc (INSM) on 06 Jan 2026.

Key facts

This page summarizes Sara Bonstein's Form 4 filing for INSMED Inc (INSM).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 06 Jan 2026, 16:08.

Change

Previous filing in this sequence was filed on 07 Oct 2025.
Current net transaction value: $0.

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 0001604019 Primary reporting owner

Bonstein Sara

Relationship: Chief Financial Officer
Address: 700 US HIGHWAY 202/206, BRIDGEWATER
Signature: /s/ Sara Bonstein, by Michael A. Smith as Attorney-in-fact
Signature date: 06 Jan 2026

Reported non-derivative transactions

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

INSM transaction

Common Stock

Award

Transaction value
Shares: +5,998
Change %: +8.2%
Price
Shares after: 79,503
Date: 02 Jan 2026
Ownership: Direct
Footnotes: F1, F2

INSM transaction

Common Stock

Award

Transaction value
Shares: +5,645
Change %: +7.1%
Price
Shares after: 85,148
Date: 02 Jan 2026
Ownership: Direct
Footnotes: F2, F3

Reported derivative securities

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

INSM transaction Derivative

Stock Option (right to buy)

Award

Transaction value: $0
Shares: +31,280
Change %
Price: $0.000000
Shares after: 31,280
Date: 02 Jan 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 31,280
Exercise price: $177.12
Footnotes: F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

Represents Restricted Stock Units (RSUs), each representing a contingent right to receive one share of Common Stock, granted pursuant to the Company's Amended and Restated 2019 Incentive Plan, as amended. The RSUs vest as follows: 25% on the first day of the first month following the first anniversary of the date of grant (the Initial Vesting Date) and 25% on each anniversary of the Initial Vesting Date until fully vested.

Footnote F2

Each RSU was granted on January 2, 2026 for no consideration.

Footnote F3

Represents RSUs, each representing a contingent right to receive one share of Common Stock, granted pursuant to the Company's Amended and Restated 2019 Incentive Plan, as amended. The RSUs vest in full on February 1, 2029.

Footnote F4

These stock options were granted under the Company's Amended and Restated 2019 Incentive Plan, as amended. The options become exercisable based on the following vesting schedule: 25% vest on the Initial Vesting Date and an additional 12.5% vest every six months thereafter until fully vested.

SEC remarks

Exhibit List - Exhibit 24 - Power of Attorney