Institutional HoldersBeta

Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.

Lumexa Imaging Holdings, Inc.

CIK 0002071288LMRI· quarter ending 2026-06-30

Shares outstanding

96,074,976

as of 2026-08-12 · 10-Q cover page, filed 2026-08-13

Held by 13F filers

31,424,334

32.7% of shares outstanding

Holders

102

+12 vs 2026-03-31 · 31 new, 19 exited

Value

$354.7M

shares -1.6% vs prior quarter

Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-12)

Class	Listed	Shares outstanding	Held by 13F filers	% of class	Holders	CUSIP
Common stock	LMRI · NASDAQ	96,074,976	31,424,334	32.7%	102	550249106

Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.

Securities (CUSIPs held in 13F this quarter)

tick to combine

Count	CUSIP	Class (as filers write it)	Holders	Shares held	Class shares	% of class	Value	Options	Mapped via
	550249106	COM	102	31,424,334	96,074,976	32.7%	$354.7M	—	13DG	holders →

Totals combine the ticked CUSIPs and update as you tick: common-stock classes by default; preferreds, notes, warrants and depositary shares are listed but not counted. "holders →" shows a single CUSIP on its own. Bonds are held as a principal amount, not shares. Options positions are never counted as holdings. 1 further CUSIPs map to this company (mostly bonds) but no 13F filer held them this quarter.

Top holders (102 of 102 · 550249106)

change vs 2026-03-31

#	Filer	Shares	% of class	Value	Change
1	BROWN ADVISORY INC	5,777,574	6.01%	$65.2M	+4,072,497 (+238.8%)
2	MASSACHUSETTS FINANCIAL SERVICES CO /MA/	3,453,723	3.59%	$39.0M	+1,119,143 (+47.9%)
3	Think Investments LP	2,559,501	2.66%	$28.9M	NEW
4	Jupiter Topco LLC	2,151,538	2.24%	$24.3M	NEW
5	BlackRock, Inc.	1,398,112	1.46%	$15.8M	-127,571 (-8.4%)
6	JPMORGAN CHASE & CO	1,154,463	1.20%	$13.3M	+49,956 (+4.5%)
7	VANGUARD CAPITAL MANAGEMENT LLC	1,070,325	1.11%	$12.1M	+11,839 (+1.1%)
8	GOLDMAN SACHS GROUP INC	807,428	0.84%	$9.1M	+41,919 (+5.5%)
9	ROYCE & ASSOCIATES LP	789,040	0.82%	$8.9M	+459,040 (+139.1%)
10	Schonfeld Strategic Advisors LLC	768,890	0.80%	$8.7M	+568,189 (+283.1%)
11	BRIGADE CAPITAL MANAGEMENT, LP	665,900	0.69%	$7.5M	NEW
12	RTW INVESTMENTS, LP	650,000	0.68%	$7.3M	—
13	MILLENNIUM MANAGEMENT LLC	627,989	0.65%	$7.1M	-86,687 (-12.1%)
14	GEODE CAPITAL MANAGEMENT, LLC	626,318	0.65%	$7.1M	-47,816 (-7.1%)
15	ADAGE CAPITAL PARTNERS GP, L.L.C.	625,270	0.65%	$7.1M	+206,742 (+49.4%)
16	ArrowMark Colorado Holdings LLC	602,049	0.63%	$6.8M	-1,051,209 (-63.6%)
17	HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND	600,000	0.62%	$6.8M	-700,000 (-53.8%)
18	Longaeva Partners L.P.	528,801	0.55%	$6.0M	-28,622 (-5.1%)
19	SILVERCREST ASSET MANAGEMENT GROUP LLC	467,339	0.49%	$5.3M	NEW
20	STATE STREET CORP	459,128	0.48%	$5.2M	+82,336 (+21.9%)
21	FRANKLIN RESOURCES INC	448,543	0.47%	$5.1M	+125,642 (+38.9%)
22	Bullseye Asset Management LLC	390,185	0.41%	$4.4M	+370,185 (+1850.9%)
23	Prescott Group Capital Management, L.L.C.	357,050	0.37%	$4.0M	—
24	KAYNE ANDERSON RUDNICK INVESTMENT MANAGEMENT LLC	292,921	0.30%	$3.3M	-12,656 (-4.1%)
25	Point72 Asset Management, L.P.	280,963	0.29%	$3.2M	+179,685 (+177.4%)
26	Select Asset Management & Trust	278,000	0.29%	$3.1M	NEW
27	Granahan Investment Management, LLC	263,156	0.27%	$3.0M	NEW
28	READYSTATE ASSET MANAGEMENT LP	250,533	0.26%	$2.8M	+25,778 (+11.5%)
29	SEI INVESTMENTS CO	224,343	0.23%	$2.5M	+136,153 (+154.4%)
30	VANGUARD PORTFOLIO MANAGEMENT LLC	200,286	0.21%	$2.3M	+53,414 (+36.4%)
31	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	198,058	0.21%	$2.2M	-11,393 (-5.4%)
32	BECK MACK & OLIVER LLC	170,700	0.18%	$1.9M	NEW
33	VANGUARD FIDUCIARY TRUST CO	163,370	0.17%	$1.8M	+2,019 (+1.3%)
34	NORTHERN TRUST CORP	162,421	0.17%	$1.8M	-19,009 (-10.5%)
35	FMR LLC	151,687	0.16%	$1.7M	-642,902 (-80.9%)
36	STATE OF WISCONSIN INVESTMENT BOARD	146,486	0.15%	$1.7M	NEW
37	XTX Topco Ltd	137,470	0.14%	$1.6M	-94,888 (-40.8%)
38	SEVEN GRAND MANAGERS, LLC	110,000	0.11%	$1.2M	—
39	Trexquant Investment LP	103,476	0.11%	$1.2M	NEW
40	F/m Investments LLC	96,046	0.10%	$1.1M	+1,069 (+1.1%)
41	EMERALD MUTUAL FUND ADVISERS TRUST	96,046	0.10%	$1.1M	-557,296 (-85.3%)
42	AMERIPRISE FINANCIAL INC	83,761	0.09%	$945K	-43,248 (-34.1%)
43	FEDERATED HERMES, INC.	80,000	0.08%	$902K	-490,000 (-86.0%)
44	Squarepoint Ops LLC	79,934	0.08%	$902K	+66,763 (+506.9%)
45	AQR CAPITAL MANAGEMENT LLC	78,217	0.08%	$882K	NEW
46	Ghisallo Capital Management LLC	75,000	0.08%	$846K	—
47	UBS Group AG	66,948	0.07%	$755K	-108,237 (-61.8%)
48	Bank of New York Mellon Corp	62,889	0.07%	$709K	+7,183 (+12.9%)
49	HARBOR CAPITAL ADVISORS, INC.	61,606	0.06%	$695K	NEW
50	CITADEL ADVISORS LLC	54,379	0.06%	$613K	-602,206 (-91.7%)
51	MORGAN STANLEY	38,863	0.04%	$438K	-65,567 (-62.8%)
52	RAYMOND JAMES FINANCIAL INC	36,383	0.04%	$410K	NEW
53	Nuveen, LLC	32,520	0.03%	$367K	+3,056 (+10.4%)
54	WELLS FARGO & COMPANY/MN	32,332	0.03%	$365K	+22,834 (+240.4%)
55	Virtu Financial LLC	30,690	0.03%	$346K	NEW
56	Sterling Capital Management LLC	27,801	0.03%	$314K	+27,091 (+3815.6%)
57	D. E. Shaw & Co., Inc.	27,800	0.03%	$314K	+11,382 (+69.3%)
58	EMERALD ADVISERS, LLC	24,441	0.03%	$276K	-899,285 (-97.4%)
59	RHUMBLINE ADVISERS	22,348	0.02%	$252K	+4,545 (+25.5%)
60	Brevan Howard Capital Management LP	19,530	0.02%	$220K	NEW
61	DEUTSCHE BANK AG\	18,503	0.02%	$209K	+6,295 (+51.6%)
62	PRICE T ROWE ASSOCIATES INC /MD/	17,874	0.02%	$202K	—
63	BANK OF AMERICA CORP /DE/	17,699	0.02%	$200K	-93,614 (-84.1%)
64	ALLIANCEBERNSTEIN L.P.	15,200	0.02%	$131K	-2,965,262 (-99.5%)
65	MetLife Investment Management, LLC	14,417	0.02%	$163K	-24 (-0.2%)
66	Russell Investments Group, Ltd.	11,530	0.01%	$130K	+9,619 (+503.3%)
67	AXQ CAPITAL, LP	11,356	0.01%	$128K	NEW
68	CITIGROUP INC	8,744	0.01%	$99K	+8,715 (+30051.7%)
69	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	8,736	0.01%	$99K	-3,126 (-26.4%)
70	NEW YORK STATE COMMON RETIREMENT FUND	8,500	0.01%	$96K	—
71	Vanguard Global Advisers, LLC	7,288	0.01%	$82K	-5,208 (-41.7%)
72	PNC Financial Services Group, Inc.	7,248	0.01%	$82K	-53 (-0.7%)
73	Police & Firemen's Retirement System of New Jersey	4,904	0.01%	$55K	—
74	Aster Capital Management (DIFC) Ltd	4,445	0.00%	$50K	NEW
75	STRS OHIO	4,400	0.00%	$50K	—
76	Balyasny Asset Management L.P.	4,152	0.00%	$47K	NEW
77	BARCLAYS PLC	3,396	0.00%	$38K	-13,451 (-79.8%)
78	BNP PARIBAS FINANCIAL MARKETS	2,900	0.00%	$33K	-2,500 (-46.3%)
79	Tower Research Capital LLC (TRC)	2,502	0.00%	$28K	+920 (+58.2%)
80	Ameritas Investment Partners, Inc.	2,072	0.00%	$23K	—
81	Arax Advisory Partners	1,852	0.00%	$21K	NEW
82	Legal & General Group Plc	1,736	0.00%	$20K	-473 (-21.4%)
83	ROYAL BANK OF CANADA	1,180	0.00%	$14K	NEW
84	FIRST HORIZON CORP	723	0.00%	$8K	—
85	BESSEMER GROUP INC	665	0.00%	$8K	+226 (+51.5%)
86	SBI Securities Co., Ltd.	318	0.00%	$4K	+13 (+4.3%)
87	IFP Advisors, Inc	290	0.00%	$3K	NEW
88	CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	261	0.00%	$3K	-1,132 (-81.3%)
89	OSAIC HOLDINGS, INC.	215	0.00%	$2K	—
90	Allworth Financial LP	141	0.00%	$2K	+81 (+135.0%)
91	Bare Financial Services, Inc	122	0.00%	$1K	NEW
92	EverSource Wealth Advisors, LLC	85	0.00%	$958	NEW
93	True Wealth Design, LLC	83	0.00%	$937	NEW
94	GAMMA Investing LLC	50	0.00%	$564	NEW
95	ASSETMARK, INC	48	0.00%	$541	-2,010 (-97.7%)
96	Covestor Ltd	41	0.00%	$0	NEW
97	Essential Partners LLC	40	0.00%	$451	NEW
98	Farther Finance Advisors, LLC	22	0.00%	$248	NEW
99	ROTHSCHILD INVESTMENT LLC	11	0.00%	$124	NEW
100	SJS Investment Consulting Inc.	7	0.00%	$79	NEW
101	Clearstead Advisors, LLC	6	0.00%	$68	NEW
102	Freestone Grove Partners LP	2	0.00%	$23	NEW

Exited since 2026-03-31 (19 filers; largest 19 shown)

JANUS HENDERSON GROUP PLC	−2,100,356
Invesco Ltd.	−1,440,542
Pillsbury Lake Capital LLC	−814,869
PRINCIPAL FINANCIAL GROUP INC	−664,136
Woodline Partners LP	−532,098
Zimmer Partners, LP	−300,000
PRELUDE CAPITAL MANAGEMENT, LLC	−299,491
HUNTER ASSOCIATES INVESTMENT MANAGEMENT LLC	−142,962
BOOTHBAY FUND MANAGEMENT, LLC	−110,585
RENAISSANCE TECHNOLOGIES LLC	−90,423
Burkehill Global Management, LP	−50,000
TWO SIGMA INVESTMENTS, LP	−16,894
State of Wyoming	−10,596
JONES FINANCIAL COMPANIES LLLP	−583
Parkside Financial Bank & Trust	−188
MAI Capital Management	−25
Caitong International Asset Management Co., Ltd	−17
Transamerica Financial Advisors, LLC	−11
Advisory Services Network, LLC	−10

Large holders from 13D/13G (latest per reporting person, last 2 years)

Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.

Reporting person	Form	Filed	Event	Shares	% of class
BROWN ADVISORY INC	SCHEDULE 13G	2026-08-14	2026-06-30	5,842,935	6.08%
BROWN ADVISORY LLC	SCHEDULE 13G	2026-08-14	2026-06-30	5,763,534	6%
BROWN INVESTMENT ADVISORY & TRUST CO	SCHEDULE 13G	2026-08-14	2026-06-30	75,048	0.08%
SIGNATURE FINANCIAL MANAGEMENT, INC.	SCHEDULE 13G	2026-08-14	2026-06-30	4,353	0.01%
WCAS Management Corporation	SCHEDULE 13G	2026-02-13	2025-12-31	70,217,616	74.3%
WCAS XII Associates LLC	SCHEDULE 13G	2026-02-13	2025-12-31	70,217,616	74.3%
Welsh, Carson, Anderson & Stowe XII, L.P.	SCHEDULE 13G	2026-02-13	2025-12-31	70,217,616	74.3%

Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.