Sarissa Capital Management LP - 17 Mar 2026 SCHEDULE 13D/A Report for IRONWOOD PHARMACEUTICALS INC Class A Common Stock, $0.001 par value (IRWD)

Filing Manager
Sarissa Capital Management LP
Reporting Manager
Alexander J. Denner
Security
IRONWOOD PHARMACEUTICALS INC Class A Common Stock, $0.001 par value
Symbol
IRWD
Shares outstanding
162,843,862 shares
Disclosed Ownership
9,444,944 shares
Ownership
5.8%
Form type
SCHEDULE 13D/A
Filing time
19 Mar 2026, 18:35:01 UTC
Date of event
17 Mar 2026
SEC
View on sec.gov

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Quoteable Key Fact

"Sarissa Capital Management LP disclosed 5.8% ownership in IRONWOOD PHARMACEUTICALS INC Class A Common Stock, $0.001 par value (IRWD) on 17 Mar 2026."

Quick Takeaways

  • Sarissa Capital Management LP filed SCHEDULE 13D/A for IRONWOOD PHARMACEUTICALS INC Class A Common Stock, $0.001 par value (IRWD).
  • Disclosed ownership: 5.8%.
  • Date of event: 17 Mar 2026.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 19 Mar 2026, 18:35.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (2)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Sarissa Capital Management LP 5.6% 9,188,635 0 9,188,635 /s/Alexander J. Denner, Ph.D. Alexander J. Denner, Ph.D., Chief Investment Officer 0001577524
Alexander J. Denner 5.8% 9,444,944 256,309 9,188,635 /s/Alexander J. Denner, Ph.D. Alexander J. Denner, Ph.D., Chief Investment Officer

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