On this page, we present all of the funds holding MPX from our database of 13F filers, detailed in the table below. The first column indicates the name of each of the funds holding MPX, with a link to that fund's top holdings. The next columns indicate the amount of MPX stock held by each of the funds holding MPX, followed by the MPX position size held by the fund, and lastly the date of the quarterly filing period the data represents. In total, we count 74 funds holding MPX within the last two filing periods in our coverage universe of 13F filers, with the largest position size having been reported by BlackRock Inc.. For more details on the positions held by BlackRock Inc. (or by any of the other funds holding MPX), click the fund name in the "Holder" column of the funds-holding-MPX table below.

Holder	Amount	Position Size ($ in 1000's)	As of
BlackRock Inc.	693,908	$7,911	12/31/2023
MPX	693,908	$7,911	12/31/2023
Dimensional Fund Advisors LP	643,702	$7,339	12/31/2023
MPX	643,702	$7,339	12/31/2023
Gamco Investors INC. ET AL	519,215	$5,919	12/31/2023
MPX	519,215	$5,919	12/31/2023
Vanguard Group Inc.	493,212	$5,623	12/31/2023
MPX	493,212	$5,623	12/31/2023
Teton Advisors Inc.	322,000	$3,671	12/31/2023
MPX	322,000	$3,671	12/31/2023
Bank of New York Mellon Corp	313,851	$3,578	12/31/2023
MPX	313,851	$3,578	12/31/2023
Gabelli Funds LLC	229,600	$2,617	12/31/2023
MPX	229,600	$2,617	12/31/2023
Geode Capital Management LLC	211,821	$2,415	12/31/2023
MPX	211,821	$2,415	12/31/2023
State Street Corp	173,796	$1,981	12/31/2023
MPX	173,796	$1,981	12/31/2023
Northern Trust Corp	102,269	$1,166	12/31/2023
MPX	102,269	$1,166	12/31/2023
Renaissance Technologies LLC	77,202	$880	12/31/2023
MPX	77,202	$880	12/31/2023
American Century Companies Inc.	73,309	$836	12/31/2023
MPX	73,309	$836	12/31/2023
Denali Advisors LLC	70,600	$830	03/31/2024
MPX	70,600	$830	03/31/2024
Truist Financial Corp	61,070	$696	12/31/2023
MPX	61,070	$696	12/31/2023
Morgan Stanley	59,279	$676	12/31/2023
MPX	59,279	$676	12/31/2023
Los Angeles Capital Management & Equity Research Inc.	52,545	$617	03/31/2024
MPX	52,545	$617	03/31/2024
Citadel Advisors LLC		$490	12/31/2023
MPX	39,241	$447	12/31/2023
Call	14,000	$160	12/31/2023
Put	10,300	$117	12/31/2023
GSA Capital Partners LLP	40,650	$463	12/31/2023
MPX	40,650	$463	12/31/2023
Strs Ohio	37,400	$426	12/31/2023
MPX	37,400	$426	12/31/2023
Synovus Financial Corp	35,748	$408	12/31/2023
MPX	35,748	$408	12/31/2023
First Trust Advisors LP	33,151	$378	12/31/2023
MPX	33,151	$378	12/31/2023
O Shaughnessy Asset Management LLC	31,431	$358	12/31/2023
MPX	31,431	$358	12/31/2023
Janney Montgomery Scott LLC	30,311	$346	12/31/2023
MPX	30,311	$346	12/31/2023
Nuveen Asset Management LLC	27,813	$317	12/31/2023
MPX	27,813	$317	12/31/2023
Charles Schwab Investment Management Inc.	24,393	$278	12/31/2023
MPX	24,393	$278	12/31/2023
Acadian Asset Management LLC	24,362	$276	12/31/2023
MPX	24,362	$276	12/31/2023
Millennium Management LLC	21,555	$246	12/31/2023
MPX	21,555	$246	12/31/2023
BNP Paribas Arbitrage SA	21,365	$244	12/31/2023
MPX	21,365	$244	12/31/2023
Swiss National Bank	20,400	$233	12/31/2023
MPX	20,400	$233	12/31/2023
Arrowstreet Capital Limited Partnership	18,324	$209	12/31/2023
MPX	18,324	$209	12/31/2023
EntryPoint Capital LLC	17,998	$205	12/31/2023
MPX	17,998	$205	12/31/2023
Seizert Capital Partners LLC	15,564	$177	12/31/2023
MPX	15,564	$177	12/31/2023
Barclays PLC	15,051	$171	12/31/2023
MPX	15,051	$171	12/31/2023
Goldman Sachs Group Inc.	14,317	$163	12/31/2023
MPX	14,317	$163	12/31/2023
Credit Suisse AG	14,234	$162	12/31/2023
MPX	14,234	$162	12/31/2023
Wealth Enhancement Advisory Services LLC	13,271	$156	03/31/2024
MPX	13,271	$156	03/31/2024
Ritholtz Wealth Management	13,720	$156	12/31/2023
MPX	13,720	$156	12/31/2023
Teacher Retirement System of Texas	13,568	$155	12/31/2023
MPX	13,568	$155	12/31/2023
Triumph Capital Management	13,581	$155	12/31/2023
MPX	13,581	$155	12/31/2023
Price T Rowe Associates Inc. MD	13,490	$154	12/31/2023
MPX	13,490	$154	12/31/2023
Great West Life Assurance Co. Can	13,593	$154	12/31/2023
MPX	13,593	$154	12/31/2023
Jane Street Group LLC	13,193	$150	12/31/2023
MPX	13,193	$150	12/31/2023
UBS Group AG	12,562	$143	12/31/2023
MPX	12,562	$143	12/31/2023
Rhumbline Advisers	12,386	$141	12/31/2023
MPX	12,386	$141	12/31/2023
State Board of Administration of Florida Retirement System	12,144	$138	12/31/2023
MPX	12,144	$138	12/31/2023
JPMorgan Chase & Co.	11,114	$127	12/31/2023
MPX	11,114	$127	12/31/2023
Bank of America Corp DE	10,797	$123	12/31/2023
MPX	10,797	$123	12/31/2023
California State Teachers Retirement System	10,565	$120	12/31/2023
MPX	10,565	$120	12/31/2023
Connor Clark & Lunn Investment Management Ltd.	10,476	$119	12/31/2023
MPX	10,476	$119	12/31/2023
Connors Investor Services Inc.	10,000	$114	12/31/2023
MPX	10,000	$114	12/31/2023
Lazard Asset Management LLC	9,137	$104	12/31/2023
MPX	9,137	$104	12/31/2023
Victory Capital Management Inc.	6,326	$72	12/31/2023
MPX	6,326	$72	12/31/2023
American International Group Inc.	4,182	$48	12/31/2023
MPX	4,182	$48	12/31/2023
New York State Common Retirement Fund	4,172	$48	12/31/2023
MPX	4,172	$48	12/31/2023
Royal Bank of Canada	3,270	$37	12/31/2023
MPX	3,270	$37	12/31/2023
Wells Fargo & Company MN	2,209	$25	12/31/2023
MPX	2,209	$25	12/31/2023
Citigroup Inc.	1,241	$14	12/31/2023
MPX	1,241	$14	12/31/2023
Amalgamated Bank	1,187	$14	12/31/2023
MPX	1,187	$14	12/31/2023
Tower Research Capital LLC TRC	1,146	$13	12/31/2023
MPX	1,146	$13	12/31/2023
Legal & General Group Plc	937	$11	12/31/2023
MPX	937	$11	12/31/2023
Ameritas Investment Partners Inc.	813	$9	12/31/2023
MPX	813	$9	12/31/2023
FMR LLC	725	$8	12/31/2023
MPX	725	$8	12/31/2023
CENTRAL TRUST Co	606	$7	12/31/2023
MPX	606	$7	12/31/2023
Comerica Bank	618	$7	12/31/2023
MPX	618	$7	12/31/2023
Trust Co. of Vermont	553	$6	12/31/2023
MPX	553	$6	12/31/2023
Princeton Global Asset Management LLC	500	$6	12/31/2023
MPX	500	$6	12/31/2023
CWM LLC	262	$3	03/31/2024
MPX	262	$3	03/31/2024
Deutsche Bank AG	213	$2	12/31/2023
MPX	213	$2	12/31/2023
Proequities Inc.		$0	12/31/2023
MPX	0	$0	12/31/2023
Put	0	$0	12/31/2023
Call	0	$0	12/31/2023
SRS Capital Advisors Inc.	42	$0	12/31/2023
MPX	42	$0	12/31/2023
Advisor Group Holdings Inc.	20	$0	12/31/2023
MPX	20	$0	12/31/2023
Covestor Ltd	28	$0	12/31/2023
MPX	28	$0	12/31/2023
Private Wealth Management Group LLC	41	$0	12/31/2023
MPX	41	$0	12/31/2023
Group One Trading L.P.		$-3	12/31/2023
Put	300	$3	12/31/2023
Simplex Trading LLC	100	$-4	12/31/2023
Put	1,200	$13	12/31/2023
MPX	683	$8	12/31/2023
Call	100	$1	12/31/2023