Jane Street
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Jane Street’s Phathom Pharmaceuticals PHAT Stock Holding History

Jane Street’s Portfolio PHAT Stock Details PHAT Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q3 		– Sell
-138,700
Closed -$1.33M – 11525
2025
Q2 		$1.33M Buy
+138,700
New +$767K ﹤0.01% 5100
2025
Q1 		– Sell
-287,800
Closed -$2.34M – 10333
2024
Q4 		$2.34M Buy
+287,800
New +$3.56M ﹤0.01% 3845

Other funds holding PHAT

FLSM
Frazier Life Sciences Management Palo Alto, California $4.59B AUM 237.58% 1-Year Est. Return
MVM
Medicxi Ventures Management St. Helier, Jersey $177M AUM 212.06% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
CG
Carlyle Group Washington, District of Columbia $10B AUM 10.61% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
GKIM
GW&K Investment Management Boston, Massachusetts $12.8B AUM 48.82% 1-Year Est. Return
Franklin Resources
Franklin Resources San Mateo, California $462B AUM 39.16% 1-Year Est. Return
NMC
NEA Management Company Timonium, Maryland $1.59B AUM 234.06% 1-Year Est. Return

Jane Street's PHAT Position: Q2 2026 in Review

Jane Street opened a new position in Phathom Pharmaceuticals (PHAT) in Q2 2026: 212,706 shares worth $2.31M. The stake represents ﹤0.01% of the portfolio and ranks #4923 among its holdings. This is a return to the name: Jane Street previously reported a position in PHAT as recently as Q4 2025.

Jane Street first reported a position in PHAT in Q1 2021 and has held it in 14 quarters since. The position peaked at $6.38M in Q4 2025. 162 funds tracked by Wall St. Rank hold PHAT as of Q2 2026.

  • Jane Street held 212,706 shares of Phathom Pharmaceuticals worth $2.31M as of Q2 2026.
  • Phathom Pharmaceuticals was a new Jane Street position in Q2 2026.
  • Phathom Pharmaceuticals made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #4923 holding.
  • Jane Street first reported a position in Phathom Pharmaceuticals in Q1 2021 and has held it in 14 quarters since.
  • Jane Street's Phathom Pharmaceuticals position peaked at $6.38M in Q4 2025.
  • 162 funds tracked by Wall St. Rank held Phathom Pharmaceuticals as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.