There is a long list of 203 institutional holders of MRTX 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 MRTX by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-MRTX table below, the initial column indicates the name of each top institutional holder of MRTX, with a link to that fund's top holdings. The next columns indicate the amount of MRTX stock held by each of the institutional holders of MRTX, followed by the MRTX 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
EcoR1 Capital LLC	7,396,979	$434,573	12/31/2023
MRTX	7,396,979	$434,573	12/31/2023
RTW Investments LP	6,768,514	$397,650	12/31/2023
MRTX	6,768,514	$397,650	12/31/2023
Morgan Stanley	6,169,382	$362,451	12/31/2023
MRTX	6,169,382	$362,451	12/31/2023
Vanguard Group Inc.	5,306,693	$311,768	12/31/2023
MRTX	5,306,693	$311,768	12/31/2023
Avoro Capital Advisors LLC	4,886,840	$287,102	12/31/2023
MRTX	4,886,840	$287,102	12/31/2023
Baker BROS. Advisors LP	4,121,440	$242,135	12/31/2023
MRTX	4,121,440	$242,135	12/31/2023
BlackRock Inc.	3,866,202	$227,139	12/31/2023
MRTX	3,866,202	$227,139	12/31/2023
Boxer Capital LLC	3,201,440	$188,085	12/31/2023
MRTX	3,201,440	$188,085	12/31/2023
Sawtooth Solutions LLC	3,135,973	$184,238	12/31/2023
MRTX	3,135,973	$184,238	12/31/2023
Braslyn Ltd.	3,135,966	$184,238	12/31/2023
MRTX	3,135,966	$184,238	12/31/2023
State Street Corp	2,324,268	$136,551	12/31/2023
MRTX	2,324,268	$136,551	12/31/2023
Farallon Capital Management LLC	2,024,472	$118,938	12/31/2023
MRTX	2,024,472	$118,938	12/31/2023
Alpine Associates Management Inc.	1,881,400	$110,532	12/31/2023
MRTX	1,881,400	$110,532	12/31/2023
Tang Capital Management LLC	1,558,059	$91,536	12/31/2023
MRTX	1,558,059	$91,536	12/31/2023
Paradigm Biocapital Advisors LP	1,543,116	$90,658	12/31/2023
MRTX	1,543,116	$90,658	12/31/2023
Sio Capital Management LLC	1,451,925	$85,301	12/31/2023
MRTX	1,451,925	$85,301	12/31/2023
Mangrove Partners	1,101,736	$64,727	12/31/2023
MRTX	1,101,736	$64,727	12/31/2023
Geode Capital Management LLC	980,029	$57,586	12/31/2023
MRTX	980,029	$57,586	12/31/2023
Pentwater Capital Management LP	902,632	$53,030	12/31/2023
MRTX	902,632	$53,030	12/31/2023
Rock Springs Capital Management LP	835,776	$49,102	12/31/2023
MRTX	835,776	$49,102	12/31/2023
Magnetar Financial LLC	834,390	$49,020	12/31/2023
MRTX	834,390	$49,020	12/31/2023
Hsbc Holdings PLC	783,092	$46,038	12/31/2023
MRTX	783,092	$46,038	12/31/2023
Norges Bank	751,604	$44,157	12/31/2023
MRTX	751,604	$44,157	12/31/2023
Alliancebernstein L.P.	738,486	$43,386	12/31/2023
MRTX	738,486	$43,386	12/31/2023
Adage Capital Partners GP L.L.C.	667,424	$39,211	12/31/2023
MRTX	667,424	$39,211	12/31/2023
Bank of Montreal Can	651,314	$38,428	12/31/2023
MRTX	651,314	$38,428	12/31/2023
Artal Group S.A.		$29,375	12/31/2023
Call	500,000	$29,375	12/31/2023
Armistice Capital LLC	500,000	$29,375	12/31/2023
MRTX	500,000	$29,375	12/31/2023
Barclays PLC		$29,368	12/31/2023
MRTX	492,345	$28,927	12/31/2023
Call	7,500	$441	12/31/2023
Jane Street Group LLC		$28,143	12/31/2023
MRTX	409,843	$24,078	12/31/2023
Call	130,400	$7,661	12/31/2023
Put	61,200	$3,596	12/31/2023
National Bank of Canada FI	473,500	$27,986	12/31/2023
MRTX	473,500	$27,986	12/31/2023
Dimensional Fund Advisors LP	422,059	$24,796	12/31/2023
MRTX	422,059	$24,796	12/31/2023
Madison Avenue Partners LP	417,427	$24,524	12/31/2023
MRTX	417,427	$24,524	12/31/2023
Healthcare of Ontario Pension Plan Trust Fund	381,200	$22,396	12/31/2023
MRTX	381,200	$22,396	12/31/2023
Charles Schwab Investment Management Inc.	365,428	$21,469	12/31/2023
MRTX	365,428	$21,469	12/31/2023
Water Island Capital LLC	343,735	$20,194	12/31/2023
MRTX	343,735	$20,194	12/31/2023
Nuveen Asset Management LLC	294,396	$17,296	12/31/2023
MRTX	294,396	$17,296	12/31/2023
Calamos Advisors LLC	277,808	$16,321	12/31/2023
MRTX	277,808	$16,321	12/31/2023
New York Life Investment Management LLC	255,584	$15,016	12/31/2023
MRTX	255,584	$15,016	12/31/2023
Northern Trust Corp	253,930	$14,918	12/31/2023
MRTX	253,930	$14,918	12/31/2023
Gabelli Funds LLC	241,587	$14,193	12/31/2023
MRTX	241,587	$14,193	12/31/2023
Sand Grove Capital Management LLP	224,632	$13,197	12/31/2023
MRTX	224,632	$13,197	12/31/2023
GABELLI & Co INVESTMENT ADVISERS INC.	219,513	$12,896	12/31/2023
MRTX	219,513	$12,896	12/31/2023
Natixis	215,731	$12,674	12/31/2023
MRTX	215,731	$12,674	12/31/2023
Bank of America Corp DE		$11,633	12/31/2023
Call	162,000	$9,518	12/31/2023
MRTX	36,000	$2,115	12/31/2023
5AM Venture Management LLC	192,500	$11,309	12/31/2023
MRTX	192,500	$11,309	12/31/2023
Tudor Investment Corp Et Al	171,537	$10,078	12/31/2023
MRTX	171,537	$10,078	12/31/2023
Rafferty Asset Management LLC	158,931	$9,337	12/31/2023
MRTX	158,931	$9,337	12/31/2023
Susquehanna Portfolio Strategies LLC	154,720	$9,090	12/31/2023
MRTX	154,720	$9,090	12/31/2023
Silverarc Capital Management LLC		$8,812	12/31/2023
Call	150,000	$8,812	12/31/2023