JANA Partners Management, LP

NEW YORK, NY · CIK 1998597 · 13F filing filed 2026-08-14

SEC-registered investment adviser since 2023 · limited partnership

Assets managed$2.3bn
Staff19 · 7 in investment roles
Main clients (by assets)Private funds 100%
Private funds6 (6 hedge) · $2.3bn gross assets
Form ADV · 2026-05-29SEC adviser record

Legal entityJANA PARTNERS MANAGEMENT, LP (US)

$1.9bn reported value +14.1% vs Q1 2026

10positions

100.0%in top 10

0 new 5 added 4 reduced 1 sold out vs Q1 2026

This manager withheld holdings under SEC confidential treatment in Q1 2026, so positions that look new may have been held then. They're marked "Not comparable".

Holdings, Q2 2026

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	MERCURY SYS INC COM MRCY	MRCY	3,958,849	$484.3m25.46%	25.46%	Reduced -148.6k	-148,575 -3.6%
2	COOPER COS INC COM COO	COO	3,582,480	$256.9m13.50%	13.50%	Added +17.3k	+17,322 0.5%
3	SPDR S&P 500 ETF TR TR UNIT SPY	SPY	342,965	$256.1m13.46%	13.46%	Reduced -700	-700 -0.2%
4	LAMB WESTON HLDGS INC COM LW	LW	5,394,635	$232.9m12.25%	12.25%	Added +386.0k	+386,000 7.7%
5	FISERV INC COM FISV	FISV	3,662,080	$179.6m9.44%	9.44%	Reduced -773.5k	-773,525 -17.4%
6	MARKEL GROUP INC COM MKL	MKL	76,743	$149.9m7.88%	7.88%	Added +1.4k	+1,436 1.9%
7	ALKAMI TECHNOLOGY INC COM ALKT	ALKT	6,747,707	$122.3m6.43%	6.43%	Added +1.3m	+1,316,319 24.2%
8	SIX FLAGS ENTERTAINMENT CORP COM FUN	FUN	4,116,099	$87.7m4.61%	4.61%	Unchanged
9	PURE STORAGE INC CL A P	P	989,196	$77.9m4.10%	4.10%	Reduced -53.1k	-53,100 -5.1%
10	RAPID7 INC COM RPD	RPD	6,749,936	$54.7m2.87%	2.87%	Added +6.3k	+6,283 0.1%

Sold out since Q1 2026

Security	Ticker	Shares held before	Value then
ENHABIT INC EHAB	EHAB	2,090,412	$29.5m2.1m shares

Stakes above 5%

Companies where this manager has reported owning more than 5% of a class of shares, on Schedule 13D (may seek influence) or 13G (passive): its latest filing for each, from 19 Dec 2024 on.

Company	Ticker	Stake	Change	Schedule	Last filed
RAPID7 INC RPD · 13D · filed 2026-03-30	RPD	10.3%≈ $54.8m	+0.2 pts	13D	2026-03-30
MERCURY SYS INC MRCY · 13D · filed 2026-03-04	MRCY	6.9%≈ $503.3m	-1.4 pts	13D	2026-03-04
ALKAMI TECHNOLOGY INC ALKT · 13D · filed 2026-10-16	ALKT	6.3%≈ $122.3m	no change	13D	2026-10-16

Trades reported as a company insider since 1 Apr 2026

Owning 10% or more of a company, or having someone on its board, makes this manager an insider there: it reports its trades in that company's shares on Form 4 within two business days. Open-market and private purchases and sales only.

Date	Company	Ticker	Trade	Shares	Value	Their holding
2026-04-15	LAMB WESTON HLDGS INC Director · See footnote	LW	Bought	50,000	$2.2m50.0k shares	+1%
2026-04-13	LAMB WESTON HLDGS INC Director · See footnote	LW	Bought	100,000	$4.2m100.0k shares	+2%
2026-04-08	LAMB WESTON HLDGS INC Director · See footnote	LW	Bought	100,000	$4.1m100.0k shares	+2%
2026-04-07	LAMB WESTON HLDGS INC Director · See footnote	LW	Bought	136,000	$5.6m136.0k shares	+3%