STATE OF WISCONSIN INVESTMENT BOARD
Position in PHAT — Phathom Pharmaceuticals, Inc.
CIK 854157
MADISON, WI
Position in PHAT
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$488,884
+$235,306 QoQ
Shares Held
44,004
+187.9% QoQ
Ownership
0.054%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
24 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in PHAT Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026STATE OF WISCONSIN INVESTMENT BOARD holds $473,893,216 across 164 Biotechnology names. PHAT ranks #128 (0.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | VRTX |
Vertex Pharmaceuticals Inc / Ma
|
136,548 | $60,974,143 | |
| 2 | REGN |
Regeneron Pharmaceuticals, Inc.
|
55,274 | $42,706,903 | |
| 3 | ALNY |
Alnylam Pharmaceuticals, Inc.
|
68,883 | $22,791,318 | |
| 4 | INSM |
INSMED Inc
|
114,346 | $18,697,857 | |
| 5 | XENE |
Xenon Pharmaceuticals Inc.
|
254,483 | $14,798,186 | |
| 6 | MRNA |
Moderna, Inc.
|
227,162 | $11,539,829 | |
| 7 | INCY |
Incyte Corp
|
116,878 | $11,000,557 | |
| 8 | TECH |
BIO-TECHNE Corp
|
208,871 | $10,915,598 |
All Filings in PHAT
Export CSV
24 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $488,884 | 44,004 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $253,578 | 15,285 | Shares | Sole | 2026-02-17 | |
| 2025-06-30 | $870,589 | 90,781 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $625,595 | 99,776 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $1,074,024 | 132,269 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $1,478,401 | 81,770 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $1,169,997 | 113,592 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $628,555 | 59,186 | Shares | Sole | 2024-05-14 | |
| 2023-12-31 | $431,976 | 47,314 | Shares | Sole | 2024-02-12 | |
| 2023-09-30 | $868,549 | 83,756 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $1,235,744 | 86,295 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $679,492 | 95,167 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $1,097,080 | 97,779 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $960,503 | 86,688 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $741,369 | 87,840 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $602,923 | 44,300 | Shares | Sole | 2022-05-13 | |
| 2021-12-31 | $293,083 | 14,900 | Shares | Sole | 2022-02-11 | |
| 2021-09-30 | $478,290 | 14,900 | Shares | Sole | 2021-11-12 | |
| 2021-06-30 | $504,365 | 14,900 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $559,644 | 14,900 | Shares | Sole | 2021-05-17 | |
| 2020-12-31 | $494,978 | 14,900 | Shares | Sole | 2021-02-03 | |
| 2020-09-30 | $612,389 | 16,700 | Shares | Sole | 2020-11-16 | |
| 2020-06-30 | $549,597 | 16,700 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $431,194 | 16,700 | Shares | Sole | 2020-05-06 | |
| No filing history on record for this holder in this stock. | ||||||