There is a long list of 142 institutional holders of MGNX 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 MGNX by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-MGNX table below, the initial column indicates the name of each top institutional holder of MGNX, with a link to that fund's top holdings. The next columns indicate the amount of MGNX stock held by each of the institutional holders of MGNX, followed by the MGNX 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
Bellevue Group AG	9,953,313	$95,751	12/31/2023
MGNX	9,953,313	$95,751	12/31/2023
BlackRock Inc.	6,140,349	$59,070	12/31/2023
MGNX	6,140,349	$59,070	12/31/2023
T. Rowe Price Investment Management Inc.	5,639,994	$54,257	12/31/2023
MGNX	5,639,994	$54,257	12/31/2023
Armistice Capital LLC	4,572,000	$43,983	12/31/2023
MGNX	4,572,000	$43,983	12/31/2023
Vanguard Group Inc.	4,309,394	$41,456	12/31/2023
MGNX	4,309,394	$41,456	12/31/2023
RA Capital Management L.P.	4,053,077	$38,991	12/31/2023
MGNX	4,053,077	$38,991	12/31/2023
Frazier Life Sciences Management L.P.	2,401,704	$23,104	12/31/2023
MGNX	2,401,704	$23,104	12/31/2023
State Street Corp	2,174,022	$20,914	12/31/2023
MGNX	2,174,022	$20,914	12/31/2023
Wasatch Advisors Inc.	989,579	$14,567	03/31/2024
MGNX	989,579	$14,567	03/31/2024
Geode Capital Management LLC	1,404,068	$13,509	12/31/2023
MGNX	1,404,068	$13,509	12/31/2023
Silverarc Capital Management LLC	1,258,641	$12,108	12/31/2023
MGNX	1,258,641	$12,108	12/31/2023
Dimensional Fund Advisors LP	1,214,900	$11,689	12/31/2023
MGNX	1,214,900	$11,689	12/31/2023
Rock Springs Capital Management LP	1,178,796	$11,340	12/31/2023
MGNX	1,178,796	$11,340	12/31/2023
JPMorgan Chase & Co.	1,134,744	$10,916	12/31/2023
MGNX	1,134,744	$10,916	12/31/2023
Acadian Asset Management LLC	1,057,693	$10,174	12/31/2023
MGNX	1,057,693	$10,174	12/31/2023
Millennium Management LLC	862,965	$8,302	12/31/2023
MGNX	862,965	$8,302	12/31/2023
Charles Schwab Investment Management Inc.	833,500	$8,018	12/31/2023
MGNX	833,500	$8,018	12/31/2023
Federated Hermes Inc.	803,375	$7,728	12/31/2023
MGNX	803,375	$7,728	12/31/2023
Northern Trust Corp	774,479	$7,450	12/31/2023
MGNX	774,479	$7,450	12/31/2023
Renaissance Technologies LLC	763,527	$7,345	12/31/2023
MGNX	763,527	$7,345	12/31/2023
Pinnacle Associates Ltd.	687,980	$6,618	12/31/2023
MGNX	687,980	$6,618	12/31/2023
Goldman Sachs Group Inc.	617,963	$5,945	12/31/2023
MGNX	617,963	$5,945	12/31/2023
Perceptive Advisors LLC	611,932	$5,887	12/31/2023
MGNX	611,932	$5,887	12/31/2023
Nuveen Asset Management LLC	607,211	$5,841	12/31/2023
MGNX	607,211	$5,841	12/31/2023
Integral Health Asset Management LLC	450,000	$4,329	12/31/2023
MGNX	450,000	$4,329	12/31/2023
Macquarie Group Ltd.	420,000	$4,040	12/31/2023
MGNX	420,000	$4,040	12/31/2023
Panagora Asset Management Inc.	398,944	$3,838	12/31/2023
MGNX	398,944	$3,838	12/31/2023
Morgan Stanley	351,175	$3,378	12/31/2023
MGNX	351,175	$3,378	12/31/2023
Principal Financial Group Inc.	267,876	$2,577	12/31/2023
MGNX	267,876	$2,577	12/31/2023
Bank of New York Mellon Corp	265,072	$2,550	12/31/2023
MGNX	265,072	$2,550	12/31/2023
Connor Clark & Lunn Investment Management Ltd.	244,196	$2,349	12/31/2023
MGNX	244,196	$2,349	12/31/2023
Wellington Management Group LLP	238,123	$2,291	12/31/2023
MGNX	238,123	$2,291	12/31/2023
Deutsche Bank AG	188,332	$1,812	12/31/2023
MGNX	188,332	$1,812	12/31/2023
ClariVest Asset Management LLC	186,847	$1,797	12/31/2023
MGNX	186,847	$1,797	12/31/2023
Citadel Advisors LLC		$1,748	12/31/2023
MGNX	182,484	$1,755	12/31/2023
Put	5,100	$49	12/31/2023
Call	4,400	$42	12/31/2023
Massachusetts Financial Services Co. MA	165,107	$1,588	12/31/2023
MGNX	165,107	$1,588	12/31/2023
Barclays PLC	157,531	$1,516	12/31/2023
MGNX	157,531	$1,516	12/31/2023
Arrowstreet Capital Limited Partnership	156,493	$1,505	12/31/2023
MGNX	156,493	$1,505	12/31/2023
DAFNA Capital Management LLC	152,250	$1,465	12/31/2023
MGNX	152,250	$1,465	12/31/2023
Susquehanna Portfolio Strategies LLC	149,184	$1,435	12/31/2023
MGNX	149,184	$1,435	12/31/2023
Bank of America Corp DE	142,418	$1,370	12/31/2023
MGNX	142,418	$1,370	12/31/2023
Atom Investors LP	139,090	$1,338	12/31/2023
MGNX	139,090	$1,338	12/31/2023
UBS Group AG	133,011	$1,280	12/31/2023
MGNX	133,011	$1,280	12/31/2023
AQR Capital Management LLC	132,374	$1,273	12/31/2023
MGNX	132,374	$1,273	12/31/2023
Exome Asset Management LLC	125,900	$1,211	12/31/2023
MGNX	125,900	$1,211	12/31/2023
GSA Capital Partners LLP	123,716	$1,190	12/31/2023
MGNX	123,716	$1,190	12/31/2023
Jacobs Levy Equity Management Inc.	114,979	$1,106	12/31/2023
MGNX	114,979	$1,106	12/31/2023
Alliancebernstein L.P.	107,600	$1,035	12/31/2023
MGNX	107,600	$1,035	12/31/2023
Susquehanna International Group LLP		$956	12/31/2023
MGNX	80,222	$772	12/31/2023
Call	19,100	$184	12/31/2023
Rafferty Asset Management LLC	94,732	$911	12/31/2023
MGNX	94,732	$911	12/31/2023