Ticker · CUSIP 71722W107

PHAT

PHATHOM PHARMACEUTICALS INC

Healthcare·Biotechnology

···Share

Holders (tracked)

Combined shares

3,065,865

Combined value

$50.86M

Last close

$13.19

Quarter

2025Q4

Price is -20.5% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$13.19+9.16 (+227.30%)H $18.08 · L $2.29 · Avg Vol 1.5M

Tracked holders · last 8 quarters

+4 vs previous quarter over the last 8.

SEC event timeline

12 events

Ken Griffin (Citadel Advisors) trimmed2026-02-17
−197,405 shares · 2025Q4
Position
D.E. Shaw & Co. opened position2026-02-17
+261,068 shares · 2025Q4
Position
Two Sigma Investments opened position2026-02-17
+57,783 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−2,999,271 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+5,152 shares · 2025Q4
Position
Wellington Management trimmed2026-02-17
−11,913 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+28,554 shares · 2025Q4
Position
AQR Capital Management added2026-02-17
+1,819 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) added2025-11-14
+2,830,954 shares · 2025Q3
Position
T. Rowe Price added2025-11-14
+1,815 shares · 2025Q3
Position
Wellington Management opened position2025-11-14
+146,459 shares · 2025Q3
Position
AQR Capital Management added2025-11-14
+2,705 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for PHAT →

Follow-the-investor returns

If you'd copied each holder of PHAT…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
AQR Capital Management	2022Q4	$7.56	+74.4%	$718K
Two Sigma Investments	2021Q1	$9.06	+45.7%	$762K
Izzy Englander (Millennium Mgmt)	2020Q4	$10.50	+25.6%	$27.5M
Wellington Management	2023Q2	$11.41	+15.6%	$1.8M
D.E. Shaw & Co.	2019Q4	$15.10	-12.6%	$3.4M
Ken Griffin (Citadel Advisors)	2020Q1	$16.32	-19.2%	$914K
Ken Griffin (Citadel Advisors)	2020Q1	$16.32	-19.2%	$914K
Ken Griffin (Citadel Advisors)	2020Q1	$16.32	-19.2%	$914K
T. Rowe Price	2020Q2	$16.46	-19.9%	$489K
Paul Tudor Jones (Tudor Investment)	2024Q3	$18.08	-27.0%	$377K

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions3

D.E. Shaw & Co.
+261,068
$4.3M
Two Sigma Investments
+57,783
$959K
Paul Tudor Jones (Tudor Investment)
+28,554
$474K

Added to2

AQR Capital Management
+1,819
$30K
T. Rowe Price
+5,152
$86

Trimmed3

Izzy Englander (Millennium Mgmt)
−2,999,271
$49.8M
Ken Griffin (Citadel Advisors)
−197,405
$3.3M
Wellington Management
−11,913
$198K

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	4	2,135,823	$9.01B	—
2022Q2	7	1,831,051	$15.5M	+3
2022Q3	5	1,715,658	$19.0M	-2
2022Q4	6	1,739,080	$19.5M	+1
2023Q1	8	1,980,530	$14.1M	+2
2023Q2	10	2,368,426	$33.9M	+2
2023Q3	9	3,120,373	$32.4M	-1
2023Q4	9	3,246,653	$29.6M	—
2024Q1	8	3,834,060	$40.7M	-1
2024Q2	7	3,563,036	$36.7M	-1
2024Q3	10	1,252,299	$22.6M	+3
2024Q4	8	799,536	$6.5M	-2
2025Q1	8	1,214,313	$7.6M	—
2025Q2	5	2,593,525	$24.9M	-3
2025Q3	6	5,859,578	$69.0M	+1
2025Q4	10	3,065,865	$50.9M	+4

Who owns PHAT

10 super-investors · 2025Q4

Tracked stake

3.07M

Combined value

$51M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New3Added2Trim5

#	Manager	Shares	Value	% of book	Last action
1	Izzy Englander Millennium Mgmt	2.08M	$35M	0.0%	Trim−3.00M
2	Ken Griffin Citadel Advisors	311.3K	$5M	0.0%	Trim−197.4K
3	D.E. Shaw & Co.	261.1K	$4M	0.0%	New+261.1K
4	Wellington Management	134.5K	$2M	0.0%	Trim−11.9K
5	Ken Griffin Citadel Advisors	69.3K	$1M	0.0%	Trim−197.4K
6	Two Sigma Investments	57.8K	$959K	0.0%	New+57.8K
7	AQR Capital Management	54.4K	$903K	0.0%	Added+1.8K
8	T. Rowe Price	37.1K	$616K	0.0%	Added+5.2K
9	Ken Griffin Citadel Advisors	29.6K	$491K	0.0%	Trim−197.4K
10	Paul Tudor Jones Tudor Investment	28.6K	$474K	0.0%	New+28.6K

Recent moves

20 transactions

TRIMKen Griffin (Citadel Advisors)
−197,405 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−2,999,271 · 2025Q4
NEWTwo Sigma Investments
+57,783 · 2025Q4
ADDT. Rowe Price
+5,152 · 2025Q4
TRIMWellington Management
−11,913 · 2025Q4
NEWD.E. Shaw & Co.
+261,068 · 2025Q4
ADDAQR Capital Management
+1,819 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+28,554 · 2025Q4
ADDT. Rowe Price
+1,815 · 2025Q3
NEWWellington Management
+146,459 · 2025Q3
ADDAQR Capital Management
+2,705 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+2,830,954 · 2025Q3
SOLDTwo Sigma Investments
−97,327 · 2025Q2
ADDT. Rowe Price
+3,091 · 2025Q2
SOLDWellington Management
−200,690 · 2025Q2
ADDIzzy Englander (Millennium Mgmt)
+1,727,134 · 2025Q2
TRIMAQR Capital Management
−57,475 · 2025Q2
TRIMTwo Sigma Investments
−388,463 · 2025Q1
ADDIzzy Englander (Millennium Mgmt)
+463,372 · 2025Q1
SOLDPaul Tudor Jones (Tudor Investment)
−34,049 · 2025Q1

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