Phathom Pharmaceuticals, Inc. (PHAT) has 20 known insider and institutional holders on record. The largest holder is Frazier Life Sciences IX, L.P. with 5,827,415 shares. Other notable holders include TAKEDA PHARMACEUTICAL CO LTD and RA CAPITAL MANAGEMENT, L.P..
Over the last 12 months, insiders have made 41 transactions in PHAT stock — 22 buys (valued at $10.48M) and 3 sells (valued at $26.8K). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.
PHAT Insider Ownership
Top Holder
Frazier Life Sciences IX, L.P.
5,827,415 shares
Buys (12 mo)
22
$10.48M value
Sells (12 mo)
3
$26.8K value
12-Month Transaction Activity
Top Insider Holders
| # |
Name |
Role |
Shares Owned |
Last Filed |
Relative Size |
| 1 |
Frazier Life Sciences Ix, L.p. |
10 Percent Owner |
5,827,415 |
2020-06-16 |
|
| 2 |
Takeda Pharmaceutical Co Ltd |
10 Percent Owner |
3,755,583 |
2024-01-25 |
|
| 3 |
Ra Capital Management, L.p. |
10 Percent Owner |
3,115,008 |
2021-03-15 |
|
| 4 |
Kohli Aditya |
Chief Business Officer |
843,352 |
2019-10-24 |
|
| 5 |
Basta Steven L |
President and CEO |
373,315 |
2026-02-12 |
|
| 6 |
Curran Terrie |
President and Chief Executive |
342,500 |
2025-03-03 |
|
| 7 |
Henderson Molly |
CFO and Cbo |
89,868 |
2025-04-08 |
|
| 8 |
Cook Anne Marie |
Chief Legal Off. & Corp. Sec. |
88,660 |
2026-02-12 |
|
| 9 |
Medicxi Ventures Management (jersey) Ltd |
10 Percent Owner |
61,975 |
2024-01-26 |
|
| 10 |
Breedlove Robert Charles |
Principal Accounting Officer |
60,068 |
2026-03-03 |
|
| 11 |
Branning Todd P. |
Chief Financial Officer |
60,000 |
2021-01-29 |
|
| 12 |
Nabulsi Azmi |
Chief Operating Officer |
55,000 |
2025-03-03 |
|
| 13 |
Narula Sanjeev |
Chief Financial & Bus. Officer |
42,848 |
2026-01-02 |
|
| 14 |
Schroeder Theodore R |
Director |
21,000 |
2025-04-16 |
|
| 15 |
Topper James N |
10 Percent Owner |
17,500 |
2025-06-05 |
|
| 16 |
Karbe Frank |
Director |
17,500 |
2025-06-05 |
|
| 17 |
Socks David A |
Director |
17,500 |
2024-05-24 |
|
| 18 |
Fields Heidi |
Director |
17,500 |
2025-06-05 |
|
| 19 |
Stenhouse Mark |
Director |
17,500 |
2025-06-05 |
|
| 20 |
Cola Michael F |
Director |
17,500 |
2025-06-05 |
|
Recent Transactions (last 12 months)
| Date |
Name |
Role |
Type |
Shares |
Price |
Value |
| 2026-03-10 |
Parikh Asit |
Director |
Gift (Given) |
40,000 |
- |
- |
| 2026-02-27 |
Breedlove Robert Charles |
Principal Accounting Officer |
RSU Award |
13,000 |
- |
- |
| 2026-02-10 |
Basta Steven L |
President and CEO |
Tax Withholding of RSU |
6,277 |
$12.82 |
$80.47K |
| 2026-02-10 |
Cook Anne Marie |
Chief Legal Off. & Corp. Sec. |
Tax Withholding of RSU |
1,535 |
$12.82 |
$19.68K |
| 2026-01-23 |
Parikh Asit |
Director |
Gift (Given) |
80,500 |
- |
- |
| 2026-01-21 |
Breedlove Robert Charles |
Principal Accounting Officer |
Tax Withholding of RSU |
776 |
$13.61 |
$10.56K |
| 2026-01-13 |
Parikh Asit |
Director |
Option Exercise (Sell) |
8,750 |
$10.30 |
$90.13K |
| 2026-01-02 |
Narula Sanjeev |
Chief Financial & Bus. Officer |
RSU Award |
42,848 |
$15.71 |
$673.14K |
| 2026-01-02 |
Basta Steven L |
President and CEO |
RSU Award |
226,156 |
$15.71 |
$3.55M |
| 2026-01-02 |
Cook Anne Marie |
Chief Legal Off. & Corp. Sec. |
RSU Award |
67,878 |
$15.71 |
$1.07M |
| 2025-12-19 |
Parikh Asit |
Director |
Option Exercise (Sell) |
8,750 |
$10.30 |
$90.13K |
| 2025-12-18 |
Breedlove Robert Charles |
Principal Accounting Officer |
Tax Withholding of RSU |
230 |
$16.28 |
$3.74K |
| 2025-12-17 |
Basta Steven L |
President and CEO |
Tax Withholding of RSU |
31,502 |
$15.36 |
$483.87K |
| 2025-12-17 |
Cook Anne Marie |
Chief Legal Off. & Corp. Sec. |
Tax Withholding of RSU |
7,703 |
$15.36 |
$118.32K |
| 2025-11-28 |
Basta Steven L |
President and CEO |
Tax Withholding of RSU |
48,375 |
$15.62 |
$755.62K |
| 2025-11-03 |
Breedlove Robert Charles |
Principal Accounting Officer |
Informative Sell |
524 |
$13.51 |
$7.08K |
| 2025-10-06 |
Narula Sanjeev |
Chief Financial & Bus. Officer |
RSU Award |
144,000 |
- |
- |
| 2025-10-06 |
Narula Sanjeev |
Chief Financial & Bus. Officer |
RSU Award |
200,000 |
$11.61 |
$2.32M |
| 2025-10-06 |
Narula Sanjeev |
Chief Financial & Bus. Officer |
Unknown |
- |
- |
- |
| 2025-09-25 |
Basta Steven L |
President and CEO |
Tax Withholding of RSU |
48,375 |
$11.66 |
$564.05K |
| 2025-09-05 |
Breedlove Robert Charles |
Principal Accounting Officer |
Informative Sell |
461 |
$12.09 |
$5.57K |
| 2025-07-16 |
Breedlove Robert Charles |
Principal Accounting Officer |
Informative Sell |
1,692 |
$8.36 |
$14.15K |
| 2025-06-23 |
Cook Anne Marie |
Chief Legal Off. & Corp. Sec. |
RSU Award |
210,000 |
$9.47 |
$1.99M |
| 2025-06-23 |
Cook Anne Marie |
Chief Legal Off. & Corp. Sec. |
Unknown |
- |
- |
- |
| 2025-06-03 |
Parikh Asit |
Director |
RSU Award |
17,500 |
$4.95 |
$86.63K |
