INSMED Inc

INSM

Form 4 • Statement of Changes in Beneficial Ownership

SEC Accession Number: 0001402051-26-000018
Filing date: Mar 5, 2026
Earliest execution date: Mar 5, 2026
Reporting Owners: Lewis William (CEO)

Summary

Type

Sell

Net shares

-10,699

% of shares

-1.96%

Amount (USD)

$1,562,327

Insider confidence score

43.8 out of 100

Positive

  • Under Rule 10b5-1 trading plan

Negative

  • Moderate scheduled sell (<2% of shares)
  • Very large sell amount ($1M+)

Stock transactions

Transaction 1

Security

Common Stock

Action

Exercise

Date

2026-03-05

Code

M

Net shares

+6,259.0

Price per Share

$30.46

Amount (USD)

$190,649.14

Acquired/Disposed

Acquired

Shares Owned Before

301,185.0

Shares Owned After

307,444.0

Transaction 2

Security

Common Stock

Action

Exercise

Date

2026-03-05

Code

M

Net shares

+4,440.0

Price per Share

$17.16

Amount (USD)

$76,190.40

Acquired/Disposed

Acquired

Shares Owned Before

307,444.0

Shares Owned After

311,884.0

Transaction 3

Security

Common Stock

Action

Sell

Date

2026-03-05

Code

S

Net shares

-2,083.0

Price per Share

$144.23

Amount (USD)

$300,431.09

Acquired/Disposed

Disposed

Shares Owned Before

311,884.0

Shares Owned After

309,801.0

Transaction 4

Security

Common Stock

Action

Sell

Date

2026-03-05

Code

S

Net shares

-2,589.0

Price per Share

$145.27

Amount (USD)

$376,104.03

Acquired/Disposed

Disposed

Shares Owned Before

309,801.0

Shares Owned After

307,212.0

Transaction 5

Security

Common Stock

Action

Sell

Date

2026-03-05

Code

S

Net shares

-3,899.0

Price per Share

$146.66

Amount (USD)

$571,827.34

Acquired/Disposed

Disposed

Shares Owned Before

307,212.0

Shares Owned After

303,313.0

Transaction 6

Security

Common Stock

Action

Sell

Date

2026-03-05

Code

S

Net shares

-2,128.0

Price per Share

$147.54

Amount (USD)

$313,965.12

Acquired/Disposed

Disposed

Shares Owned Before

303,313.0

Shares Owned After

301,185.0

Derivative Transactions

Transaction 1

Security

Stock Option (right to buy)

Action

Exercise

Date

2026-03-05

Code

M

Net shares

-6,259.0

Acquired/Disposed

Disposed

Shares Owned Before

62,591.0

Shares Owned After

56,332.0

Transaction 2

Security

Stock Option (right to buy)

Action

Exercise

Date

2026-03-05

Code

M

Net shares

-4,440.0

Acquired/Disposed

Disposed

Shares Owned Before

44,400.0

Shares Owned After

39,960.0

Filing's footnotes

1. This transaction was effected pursuant to a 10b5-1 trading plan adopted by the Reporting Person on September 4, 2025 in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended.

2. This is the weighted average sales price representing 2,083 shares sold at prices ranging from $143.84 to $144.70 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request.

3. This is the weighted average sales price representing 2,589 shares sold at prices ranging from $144.99 to $145.78 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request.

4. This is the weighted average sales price representing 3,899 shares sold at prices ranging from $146.09 to $147.06 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request.

5. This is the weighted average sales price representing 2,128 shares sold at prices ranging from $147.15 to $148.04 per share. The Reporting Person undertakes to provide to the SEC staff, the issuer, or a security holder of the issuer the number of shares sold at each price within the price range upon request.

6. The Reporting Person no longer has a reportable beneficial interest in the securities owned by the William Lewis Family Legacy Trust, which were included in the Reporting Person's prior ownership reports.

7. The options became exercisable based on the following vesting schedule: 25% vested on the first anniversary of the grant date and an additional 12.5% vested on each sixth month anniversary date thereafter through the fourth anniversary of the date of grant.

ℹ️ Filed under Rule 10b5-1 trading plan

This page is for informational purposes only. While we strive for accuracy, the summary may contain inaccuracies or omissions. Please refer to the official SEC filing for authoritative information. Open the SEC filing.