There is a long list of 178 institutional holders of MRC within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of MRC by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-MRC table below, the initial column indicates the name of each top institutional holder of MRC, with a link to that fund's top holdings. The next columns indicate the amount of MRC stock held by each of the institutional holders of MRC, followed by the MRC position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
Vanguard Group Inc.	9,003,975	$99,134	12/31/2023
MRC	9,003,975	$99,134	12/31/2023
Pzena Investment Management LLC	7,001,859	$77,090	12/31/2023
MRC	7,001,859	$77,090	12/31/2023
BlackRock Inc.	6,560,977	$72,236	12/31/2023
MRC	6,560,977	$72,236	12/31/2023
Frontier Capital Management Co. LLC	6,005,201	$66,117	12/31/2023
MRC	6,005,201	$66,117	12/31/2023
Fuller & Thaler Asset Management Inc.	4,002,499	$44,068	12/31/2023
MRC	4,002,499	$44,068	12/31/2023
Engine Capital Management LP	3,866,886	$42,574	12/31/2023
MRC	3,866,886	$42,574	12/31/2023
Dimensional Fund Advisors LP	3,327,337	$36,635	12/31/2023
MRC	3,327,337	$36,635	12/31/2023
Wellington Management Group LLP	3,002,126	$33,053	12/31/2023
MRC	3,002,126	$33,053	12/31/2023
American Century Companies Inc.	2,251,116	$24,785	12/31/2023
MRC	2,251,116	$24,785	12/31/2023
State Street Corp	1,869,029	$20,578	12/31/2023
MRC	1,869,029	$20,578	12/31/2023
Geode Capital Management LLC	1,782,928	$19,632	12/31/2023
MRC	1,782,928	$19,632	12/31/2023
Kennedy Capital Management Inc.	1,530,794	$16,854	12/31/2023
MRC	1,530,794	$16,854	12/31/2023
Harvey Partners LLC	1,500,000	$16,515	12/31/2023
MRC	1,500,000	$16,515	12/31/2023
Charles Schwab Investment Management Inc.	1,431,512	$15,761	12/31/2023
MRC	1,431,512	$15,761	12/31/2023
Philosophy Capital Management LLC	1,377,777	$15,169	12/31/2023
MRC	1,377,777	$15,169	12/31/2023
Morgan Stanley	1,251,079	$13,774	12/31/2023
MRC	1,251,079	$13,774	12/31/2023
Mirae Asset Global Investments Co. Ltd.	1,235,674	$13,605	12/31/2023
MRC	1,235,674	$13,605	12/31/2023
Royce & Associates LP	1,078,511	$11,874	12/31/2023
MRC	1,078,511	$11,874	12/31/2023
Renaissance Technologies LLC	947,600	$10,433	12/31/2023
MRC	947,600	$10,433	12/31/2023
Assenagon Asset Management S.A.	795,818	$10,003	03/31/2024
MRC	795,818	$10,003	03/31/2024
Loomis Sayles & Co. L P	876,352	$9,649	12/31/2023
MRC	876,352	$9,649	12/31/2023
Nuveen Asset Management LLC	860,971	$9,479	12/31/2023
MRC	860,971	$9,479	12/31/2023
Northern Trust Corp	827,813	$9,114	12/31/2023
MRC	827,813	$9,114	12/31/2023
Pekin Hardy Strauss Inc.	747,447	$8,229	12/31/2023
MRC	747,447	$8,229	12/31/2023
Lord Abbett & CO. LLC	740,332	$8,151	12/31/2023
MRC	740,332	$8,151	12/31/2023
South Dakota Investment Council	729,599	$8,033	12/31/2023
MRC	729,599	$8,033	12/31/2023
Balyasny Asset Management LLC	683,452	$7,525	12/31/2023
MRC	683,452	$7,525	12/31/2023
Goldman Sachs Group Inc.	669,085	$7,367	12/31/2023
MRC	669,085	$7,367	12/31/2023
Two Sigma Advisers LP	628,700	$6,922	12/31/2023
MRC	628,700	$6,922	12/31/2023
Wintrust Investments LLC	605,510	$6,667	12/31/2023
MRC	605,510	$6,667	12/31/2023
BOKF NA	520,301	$5,729	12/31/2023
MRC	520,301	$5,729	12/31/2023
Bank of America Corp DE	492,683	$5,424	12/31/2023
MRC	492,683	$5,424	12/31/2023
D. E. Shaw & Co. Inc.	482,655	$5,314	12/31/2023
MRC	482,655	$5,314	12/31/2023
Two Sigma Investments LP	481,676	$5,303	12/31/2023
MRC	481,676	$5,303	12/31/2023
Bank of New York Mellon Corp	378,625	$4,759	03/31/2024
MRC	378,625	$4,759	03/31/2024
Appian Way Asset Management LP	430,968	$4,745	12/31/2023
MRC	430,968	$4,745	12/31/2023
Invesco Ltd.	366,573	$4,036	12/31/2023
MRC	366,573	$4,036	12/31/2023
Sourcerock Group LLC	363,936	$4,007	12/31/2023
MRC	363,936	$4,007	12/31/2023
Driehaus Capital Management LLC	362,762	$3,994	12/31/2023
MRC	362,762	$3,994	12/31/2023
Alliancebernstein L.P.	348,750	$3,840	12/31/2023
MRC	348,750	$3,840	12/31/2023
AQR Capital Management LLC	336,028	$3,700	12/31/2023
MRC	336,028	$3,700	12/31/2023
Deutsche Bank AG	275,523	$3,034	12/31/2023
MRC	275,523	$3,034	12/31/2023
Hotchkis & Wiley Capital Management LLC	263,590	$2,902	12/31/2023
MRC	263,590	$2,902	12/31/2023
Essex Investment Management Co. LLC	259,526	$2,857	12/31/2023
MRC	259,526	$2,857	12/31/2023
Maven Securities LTD	250,000	$2,752	12/31/2023
MRC	250,000	$2,752	12/31/2023
Brandywine Global Investment Management LLC	229,621	$2,528	12/31/2023
MRC	229,621	$2,528	12/31/2023
Citadel Advisors LLC		$2,217	12/31/2023
MRC	222,337	$2,448	12/31/2023
Put	21,100	$232	12/31/2023
Call	100	$1	12/31/2023
Rhumbline Advisers	188,850	$2,079	12/31/2023
MRC	188,850	$2,079	12/31/2023
Millennium Management LLC	187,420	$2,063	12/31/2023
MRC	187,420	$2,063	12/31/2023
Beryl Capital Management LLC	170,865	$1,881	12/31/2023
MRC	170,865	$1,881	12/31/2023