PHATHOM PHARMACEUTICALS INC

Ticker: PHAT CUSIP: 71722W107 Class: Common Stock

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 103,684 Value ($000) $1,720 Avg Close $14.28 Range $10.33 - $18.31

Q3 2025

Shares 4,248 Value ($000) $50 Avg Close $10.32 Range $7.61 - $13.00

Q1 2025

Shares 2,404 Value ($000) $15 Avg Close $6.07 Range $4.07 - $8.34

Q3 2024

Shares 15,130 Value ($000) $274 Avg Close $13.98 Range $9.82 - $19.71

Q2 2024

Shares 7,368 Value ($000) $76 Avg Close $10.30 Range $8.74 - $12.75

Q4 2023

Shares 1,545 Value ($000) $14 Avg Close $8.62 Range $6.83 - $10.85

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	103,684	$1,720	$14.28	$10.33 - $18.31
Q3 2025	4,248	$50	$10.32	$7.61 - $13.00
Q1 2025	2,404	$15	$6.07	$4.07 - $8.34
Q3 2024	15,130	$274	$13.98	$9.82 - $19.71
Q2 2024	7,368	$76	$10.30	$8.74 - $12.75
Q4 2023	1,545	$14	$8.62	$6.83 - $10.85