There is a long list of 293 institutional holders of MARA 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 MARA by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-MARA table below, the initial column indicates the name of each top institutional holder of MARA, with a link to that fund's top holdings. The next columns indicate the amount of MARA stock held by each of the institutional holders of MARA, followed by the MARA 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.	23,473,587	$551,395	12/31/2023
MARA	23,473,587	$551,395	12/31/2023
BlackRock Inc.		$405,908	12/31/2023
MARA	17,192,377	$403,849	12/31/2023
NOTE 1	2,525,000	$2,059	12/31/2023
Jane Street Group LLC		$273,108	12/31/2023
MARA	8,476,200	$199,106	12/31/2023
Call	5,907,200	$138,760	12/31/2023
Put	2,793,300	$65,615	12/31/2023
NOTE 1	1,000,000	$857	12/31/2023
Morgan Stanley	6,271,139	$147,309	12/31/2023
MARA	6,271,139	$147,309	12/31/2023
State Street Corp		$132,068	12/31/2023
MARA	5,424,102	$127,412	12/31/2023
NOTE 1	5,450,000	$4,656	12/31/2023
Geode Capital Management LLC	5,235,670	$123,008	12/31/2023
MARA	5,235,670	$123,008	12/31/2023
Group One Trading L.P.		$60,403	12/31/2023
Call	3,218,700	$75,607	12/31/2023
Put	1,473,500	$34,613	12/31/2023
MARA	826,257	$19,409	12/31/2023
Davidson Kempner Capital Management LP		$57,092	12/31/2023
NOTE 1	70,001,000	$57,092	12/31/2023
Two Sigma Investments LP	2,287,562	$53,735	12/31/2023
MARA	2,287,562	$53,735	12/31/2023
Capital Fund Management S.A.		$53,627	12/31/2023
MARA	2,154,135	$50,601	12/31/2023
Call	266,700	$6,265	12/31/2023
Put	137,900	$3,239	12/31/2023
Citadel Advisors LLC		$50,899	12/31/2023
Call	8,008,500	$188,120	12/31/2023
Put	5,845,400	$137,308	12/31/2023
MARA	3,721	$87	12/31/2023
Toroso Investments LLC	2,070,379	$48,633	12/31/2023
MARA	2,070,379	$48,633	12/31/2023
Northern Trust Corp	2,011,439	$47,249	12/31/2023
MARA	2,011,439	$47,249	12/31/2023
Charles Schwab Investment Management Inc.	1,823,739	$42,840	12/31/2023
MARA	1,823,739	$42,840	12/31/2023
Solus Alternative Asset Management LP		$33,956	12/31/2023
NOTE 1	41,633,000	$33,956	12/31/2023
Context Capital Management LLC		$33,131	12/31/2023
NOTE 1	40,498,000	$33,131	12/31/2023
Mirae Asset Global Investments Co. Ltd.	1,295,391	$30,429	12/31/2023
MARA	1,295,391	$30,429	12/31/2023
Whitebox Advisors LLC		$29,090	12/31/2023
NOTE 1	34,755,000	$29,090	12/31/2023
Driehaus Capital Management LLC	1,055,723	$24,799	12/31/2023
MARA	1,055,723	$24,799	12/31/2023
Price T Rowe Associates Inc. MD	1,055,242	$24,789	12/31/2023
MARA	1,055,242	$24,789	12/31/2023
Nuveen Asset Management LLC	945,279	$22,205	12/31/2023
MARA	945,279	$22,205	12/31/2023
Millennium Management LLC		$21,778	12/31/2023
MARA	921,147	$21,638	12/31/2023
Call	43,400	$1,019	12/31/2023
Put	37,400	$879	12/31/2023
Highbridge Capital Management LLC		$20,112	12/31/2023
BOND	27,455,000	$22,461	12/31/2023
Put	100,000	$2,349	12/31/2023
Two Sigma Advisers LP	822,100	$19,311	12/31/2023
MARA	822,100	$19,311	12/31/2023
Squarepoint Ops LLC		$17,643	12/31/2023
MARA	879,365	$20,656	12/31/2023
Put	157,700	$3,704	12/31/2023
Call	29,400	$691	12/31/2023
Bank of New York Mellon Corp	749,989	$17,617	12/31/2023
MARA	749,989	$17,617	12/31/2023
Van ECK Associates Corp	659,783	$15,499	12/31/2023
MARA	659,783	$15,499	12/31/2023
LPL Financial LLC	647,341	$15,206	12/31/2023
MARA	647,341	$15,206	12/31/2023
Ameriprise Financial Inc.		$14,599	12/31/2023
CONV BND	12,280,000	$10,015	12/31/2023
MARA	194,816	$4,584	12/31/2023
Vident Advisory LLC	566,011	$13,296	12/31/2023
MARA	566,011	$13,296	12/31/2023
Hel Ved Capital Management Ltd	490,901	$11,531	12/31/2023
MARA	490,901	$11,531	12/31/2023
Nomura Holdings Inc.		$11,293	12/31/2023
MARA	495,527	$11,640	12/31/2023
Put	89,800	$2,109	12/31/2023
Call	75,000	$1,762	12/31/2023
Exchange Traded Concepts LLC	472,661	$10,673	03/31/2024
MARA	472,661	$10,673	03/31/2024
Swiss National Bank	417,000	$9,795	12/31/2023
MARA	417,000	$9,795	12/31/2023
JPMorgan Chase & Co.		$9,715	12/31/2023
MARA	402,370	$9,452	12/31/2023
BOND	300,000	$263	12/31/2023
Cubist Systematic Strategies LLC		$9,707	12/31/2023
Call	484,700	$11,386	12/31/2023
Put	104,500	$2,455	12/31/2023
MARA	33,019	$776	12/31/2023
Cresset Asset Management LLC	403,720	$9,483	12/31/2023
MARA	403,720	$9,483	12/31/2023
Twinbeech Capital LP	398,713	$9,366	12/31/2023
MARA	398,713	$9,366	12/31/2023
Invesco Ltd.	366,061	$8,599	12/31/2023
MARA	366,061	$8,599	12/31/2023
Calamos Advisors LLC		$8,580	12/31/2023
NOTE 1	10,000,000	$8,580	12/31/2023
Wolverine Trading LLC		$8,519	12/31/2023
Call	1,415,400	$33,248	12/31/2023
Put	1,215,200	$28,545	12/31/2023
MARA	162,462	$3,816	12/31/2023
Dimensional Fund Advisors LP	312,262	$7,335	12/31/2023
MARA	312,262	$7,335	12/31/2023
GTS Securities LLC		$7,221	12/31/2023
Call	1,277,900	$30,018	12/31/2023
Put	970,500	$22,797	12/31/2023
Rhumbline Advisers	301,708	$7,087	12/31/2023
MARA	301,708	$7,087	12/31/2023
National Bank of Canada FI		$7,021	12/31/2023
Call	54,089	$124,026	12/31/2023
Put	51,028	$117,007	12/31/2023
MARA	106	$2	12/31/2023
UBS Group AG		$6,593	12/31/2023
MARA	224,876	$5,282	12/31/2023
Call	55,800	$1,311	12/31/2023
SG Americas Securities LLC	266,176	$6,252	12/31/2023
MARA	266,176	$6,252	12/31/2023
Buckingham Strategic Wealth LLC	265,403	$6,234	12/31/2023
MARA	265,403	$6,234	12/31/2023
Alliancebernstein L.P.	245,513	$5,767	12/31/2023
MARA	245,513	$5,767	12/31/2023
Credit Suisse AG		$5,338	12/31/2023
MARA	210,216	$4,938	12/31/2023
NOTE 1	400,000	$400	12/31/2023