Frazier Life Sciences Public Fund, L.P. - 18 Aug 2025 SCHEDULE 13D/A Report for PHATHOM PHARMACEUTICALS, INC. Common Stock, $0.0001 par value per share (PHAT)

Filing Manager
Frazier Life Sciences Public Fund, L.P.
Reporting Manager
James N. Topper
Security
PHATHOM PHARMACEUTICALS, INC. Common Stock, $0.0001 par value per share
Symbol
PHAT
Shares outstanding
69,596,826 shares
Disclosed Ownership
5,985,327 shares
Ownership
8.6%
Form type
SCHEDULE 13D/A
Filing time
20 Aug 2025, 17:18:40 UTC
Date of event
18 Aug 2025
Previous filing
13 May 2025
Next filing
04 Nov 2025
SEC
View on sec.gov

Quoteable Key Fact

"Frazier Life Sciences Public Fund, L.P. disclosed 8.6% ownership in PHATHOM PHARMACEUTICALS, INC. Common Stock, $0.0001 par value per share (PHAT) on 18 Aug 2025."

Quick Takeaways

  • Frazier Life Sciences Public Fund, L.P. filed SCHEDULE 13D/A for PHATHOM PHARMACEUTICALS, INC. Common Stock, $0.0001 par value per share (PHAT).
  • Disclosed ownership: 8.6%.
  • Date of event: 18 Aug 2025.

What Changed

  • Previous schedule filing date: 13 May 2025.
  • Current filing was accepted on 20 Aug 2025, 17:18.

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.

Source Evidence

Backed by Schedule 13D/13G

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

See Original Filing

Reporting Managers (23)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Frazier Life Sciences Public Fund, L.P. 6% 4,234,991 0 4,234,991 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLSP, L.L.C., GP of FHMLSP, L.P., GP of Frazier Life Sciences Public Fund, L.P. 0001863769
FHMLSP, L.P. 6% 4,234,991 0 4,234,991 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLSP, L.L.C., GP of FHMLSP, L.P. 0001879466
FHMLSP, L.L.C. 6% 4,234,991 0 4,234,991 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLSP, L.L.C. 0001879465
Frazier Life Sciences Public Overage Fund, L.P. 1.6% 1,088,365 0 1,088,365 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLSP Overage, L.L.C., GP of FHMLSP Overage, L.P., GP of Frazier Life Sciences Public Overage Fund, L.P. 0001913804
FHMLSP Overage, L.P. 1.6% 1,088,365 0 1,088,365 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLSP Overage, L.L.C., GP of FHMLSP Overage, L.P. 0001963247
FHMLSP Overage, L.L.C. 1.6% 1,088,365 0 1,088,365 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLSP Overage, L.L.C. 0001963248
Frazier Life Sciences X, L.P. 0.1% 59,403 0 59,403 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS X, L.L.C., GP of FHMLS X, L.P., GP of Frazier Life Sciences X, L.P. 0001790879
FHMLS X, L.P. 0.1% 59,403 0 59,403 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS X, L.L.C., GP of FHMLS X, L.P. 0001790880
FHMLS X, L.L.C. 0.1% 59,403 0 59,403 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS X, L.L.C. 0001790811
Frazier Life Sciences XI, L.P. 1.4% 980,286 0 980,286 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS XI, L.L.C., GP of FHMLS XI, L.P., GP of Frazier Life Sciences XI, L.P. 0001911592
FHMLS XI, L.P. 1.4% 980,286 0 980,286 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS XI, L.L.C., GP of FHMLS XI, L.P. 0001911580
FHMLS XI, L.L.C. 1.4% 980,286 0 980,286 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS XI, L.L.C. 0001911623
Frazier Life Sciences IX, L.P. 8.2% 5,827,415 0 5,827,415 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS IX, L.L.C., GP of FHMLS IX, L.P., GP of Frazier Life Sciences IX, L.P. 0001720320
FHMLS IX, L.P. 8.2% 5,827,415 0 5,827,415 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS IX, L.L.C., GP of FHMLS IX, L.P. 0001782789
FHMLS IX, L.L.C. 8.2% 5,827,416 0 5,827,416 /s/ Steve R. Bailey By Steve R. Bailey, CFO of FHMLS IX, L.L.C. 0001782791
Frazier Life Sciences XII, L.P. 0.4% 276,029 0 276,029 /s/ Gordon Empey By Gordon Empey, General Counsel of FHMLS XII, L.L.C., GP of FHMLS XII, L.P., GP of Frazier Life Sciences XII, L.P. 0002052255
FHMLS XII, L.P. 0.4% 276,029 0 276,029 /s/ Gordon Empey By Gordon Empey, General Counsel of FHMLS XII, L.L.C., GP of FHMLS XII, L.P. 0002052246
FHMLS XII, L.L.C. 0.4% 276,029 0 276,029 /s/ Gordon Empey By Gordon Empey, General Counsel of FHMLS XII, L.L.C. 0002052177
James N. Topper 8.6% 5,985,327 98,508 5,886,819 /s/ Steve R. Bailey By Steve R. Bailey, Attorney-in-Fact for James N. Topper, pursuant to a Power of Attorney, a copy of which was filed with the SEC on July 31, 2017 0001341382
Patrick J. Heron 8.4% 5,901,756 14,937 5,886,819 /s/ Steve R. Bailey By Steve R. Bailey, Attorney-in-Fact for Patrick J. Heron, pursuant to a Power of Attorney, a copy of which was filed with the SEC on July 31, 2017 0001365617
Albert Cha 0% 0 0 0 /s/ Steve R. Bailey By Steve R. Bailey, Attorney-in-Fact for Albert Cha, pursuant to a Power of Attorney, a copy of which was filed with the SEC on August 16, 2021 0001397906
James Brush 0% 0 0 0 /s/ Steve R. Bailey By Steve R. Bailey, Attorney-in-Fact for James Brush, pursuant to a Power of Attorney, a copy of which was filed with the SEC on August 16, 2021 0001865123
Daniel Estes 0% 0 0 0 /s/ Steve R. Bailey By Steve R. Bailey, Attorney-in-Fact for Daniel Estes, pursuant to a Power of Attorney, a copy of which was filed with the SEC on April 18, 2022 0001702527