Norwest Venture Partners XVI, LP - 26 Sep 2025 SCHEDULE 13D/A Report for MBX BIOSCIENCES, INC. Common Stock, $0.0001 par value per share (MBX)

Filing Manager
Norwest Venture Partners XVI, LP
Reporting Manager
Tiba Aynechi
Security
MBX BIOSCIENCES, INC. Common Stock, $0.0001 par value per share
Symbol
MBX
Shares outstanding
44,603,938 shares
Disclosed Ownership
2,140,989 shares
Ownership
4.8%
Form type
SCHEDULE 13D/A
Filing time
30 Sep 2025, 18:15:45 UTC
Date of event
26 Sep 2025
SEC
View on sec.gov

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Quoteable Key Fact

"Norwest Venture Partners XVI, LP disclosed 4.8% ownership in MBX BIOSCIENCES, INC. Common Stock, $0.0001 par value per share (MBX) on 26 Sep 2025."

Quick Takeaways

  • Norwest Venture Partners XVI, LP filed SCHEDULE 13D/A for MBX BIOSCIENCES, INC. Common Stock, $0.0001 par value per share (MBX).
  • Disclosed ownership: 4.8%.
  • Date of event: 26 Sep 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 30 Sep 2025, 18:15.

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 (6)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Norwest Venture Partners XVI, LP 4.8% 2,136,335 0 2,136,335 /s/ Matthew De Dominicis By Genesis VC Partners XVI, LLC, its General Partner, By NVP Associates, LLC, its Managing Member, By Matthew De Dominicis, Chief Financial Officer 0001876200
Genesis VC Partners XVI, LLC 4.8% 2,136,335 0 2,136,335 /s/ Matthew De Dominicis By NVP Associates, LLC, its Managing Member, By Matthew De Dominicis, Chief Financial Officer
NVP Associates, LLC 4.8% 2,136,335 0 2,136,335 /s/ Matthew De Dominicis By Matthew De Dominicis, Chief Financial Officer 0001545692
Jeffrey Crowe 4.8% 2,136,335 0 2,136,335 /s/ Matthew De Dominicis By Matthew De Dominicis, Attorney-in-fact 0001535261
Jon Erik Kossow 4.8% 2,136,335 0 2,136,335 /s/ Matthew De Dominicis By Matthew De Dominicis, Attorney-in-fact 0001726084
Tiba Aynechi 4.8% 2,140,989 4,654 2,136,335 /s/ Matthew De Dominicis By Matthew De Dominicis, Attorney-in-fact 0001669220

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