MGNX US Equity

MACROGENICS INC

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Health Care · Pharmaceutical Preparations · CIK 1125345 · FYE 1231

$3.67

-0.18 (-4.68%)

USD · as of 2026-07-29 · marketstack

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Institutional ownership· 13F filers holding MGNX · 2026-Q1 methodology → sources →

109 holders

% of shares outstanding held

67.9%

Shares held (13F)

43,169,311

Reporting holders

109

Top holders

largest 100 of 109 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	ARMISTICE CAPITAL, LLC	6,012,0006.0M	$17M	9.46%	TRIM -5%
2	RENAISSANCE TECHNOLOGIES LLC	2,963,5593.0M	$9M	4.66%	—
3	MILLENNIUM MANAGEMENT LLC	2,794,3572.8M	$8M	4.40%	ADD 42%
4	VANGUARD CAPITAL MANAGEMENT LLC	2,653,8532.7M	$8M	4.18%	NEW†
5	ACADIAN ASSET MANAGEMENT LLC	2,544,0002.5M	$7M	4.00%	—
6	TWO SIGMA INVESTMENTS, LP	2,527,8292.5M	$7M	3.98%	ADD 153%
7	BANK OF AMERICA CORP /DE/	2,401,8142.4M	$7M	3.78%	ADD 31%
8	MARSHALL WACE, LLP	2,025,5262.0M	$6M	3.19%	ADD 58%
9	RA CAPITAL MANAGEMENT, L.P.	1,864,1761.9M	$5M	2.93%	NEW†
10	WASATCH ADVISORS LP	1,559,7011.6M	$5M	2.45%	TRIM -13%
11	VANGUARD PORTFOLIO MANAGEMENT LLC	1,208,7751.2M	$3M	1.90%	NEW
12	BlackRock, Inc.	1,163,1461.2M	$3M	1.83%	—
13	D. E. Shaw & Co., Inc.	1,058,4241.1M	$3M	1.67%	ADD 40%
14	Connor, Clark & Lunn Investment Management Ltd.	867,249867,249	$3M	1.36%	ADD 6%
15	CITADEL ADVISORS LLC	782,618782,618	$2M	1.23%	TRIM -24%
16	GEODE CAPITAL MANAGEMENT, LLC	697,321697,321	$2M	1.10%	ADD 6%
17	JANE STREET GROUP, LLC	608,509608,509	$2M	0.96%	TRIM -52%
18	DIADEMA PARTNERS LP	600,000600,000	$2M	0.94%	NEW
19	MACKENZIE FINANCIAL CORP	597,442597,442	$2M	0.94%	ADD 187%
20	Affinity Asset Advisors, LLC	500,000500,000	$1M	0.79%	ADD 3%
21	SUSQUEHANNA INTERNATIONAL GROUP, LLP	452,227452,227	$1M	0.71%	ADD 560%
22	JACOBS LEVY EQUITY MANAGEMENT, INC	441,143441,143	$1M	0.69%	TRIM -51%
23	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	420,000420,000	$1M	0.66%	—
24	GSA CAPITAL PARTNERS LLP	379,647379,647	$1M	0.60%	TRIM -26%
25	VANGUARD FIDUCIARY TRUST CO	340,089340,089	$982,857	0.54%	NEW
26	Walleye Capital LLC	335,265335,265	$968,916	0.53%	ADD 910%
27	UBS Group AG	296,086296,086	$855,689	0.47%	ADD 148%
28	STATE STREET CORP	293,687293,687	$848,755	0.46%	ADD 7%
29	Vestal Point Capital, LP	280,000280,000	$809,200	0.44%	—
30	PINNACLE ASSOCIATES LTD	279,121279,121	$806,660	0.44%	TRIM -5%
31	GOLDMAN SACHS GROUP INC	273,478273,478	$790,351	0.43%	ADD 51%
32	DIMENSIONAL FUND ADVISORS LP	251,803251,803	$727,278	0.40%	ADD 34%
33	Amundi	214,278214,278	$619,263	0.34%	—
34	Point72 Asset Management, L.P.	208,583208,583	$602,805	0.33%	TRIM -16%
35	Qube Research & Technologies Ltd	187,464187,464	$541,771	0.29%	NEW
36	PANAGORA ASSET MANAGEMENT INC	184,910184,910	$534,390	0.29%	ADD 23%
37	Squarepoint Ops LLC	183,847183,847	$531,318	0.29%	TRIM -41%
38	XTX Topco Ltd	177,825177,825	$513,914	0.28%	TRIM -26%
39	MORGAN STANLEY	169,112169,112	$488,734	0.27%	ADD 5%
40	LPL Financial LLC	159,700159,700	$461,533	0.25%	ADD 145%
41	NORTHERN TRUST CORP	152,282152,282	$440,095	0.24%	—
42	Persistent Asset Partners Ltd	151,728151,728	$438,494	0.24%	NEW
43	Invesco Ltd.	112,373112,373	$324,758	0.18%	—
44	CANADA PENSION PLAN INVESTMENT BOARD	106,400106,400	$307,496	0.17%	TRIM -31%
45	Hudson Bay Capital Management LP	104,754104,754	$302,739	0.16%	NEW
46	Marex Group plc	100,000100,000	$289,000	0.16%	NEW
47	AXQ CAPITAL, LP	78,85078,850	$227,877	0.12%	NEW
48	AMERIPRISE FINANCIAL INC	77,26777,267	$223,301	0.12%	TRIM -17%
49	Ikarian Capital, LLC	74,89374,893	$216,441	0.12%	—
50	BRIDGEWAY CAPITAL MANAGEMENT, LLC	73,50073,500	$212,415	0.12%	TRIM -9%
51	BARCLAYS PLC	62,62762,627	$180,992	0.10%	ADD 51%
52	FMR LLC	60,74860,748	$175,562	0.10%	TRIM -2%
53	HRT FINANCIAL LP	54,73354,733	$158,000	0.09%	TRIM -71%
54	Leonteq Securities AG	50,00050,000	$144,500	0.08%	TRIM -50%
55	OMERS ADMINISTRATION Corp	49,90049,900	$144,211	0.08%	NEW
56	Man Group plc	48,01248,012	$138,755	0.08%	NEW
57	Headlands Technologies LLC	47,53147,531	$137,365	0.07%	NEW
58	PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO	42,38242,382	$122,484	0.07%	—
59	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	40,05140,051	$115,747	0.06%	NEW
60	ADAR1 Capital Management, LLC	40,00040,000	$115,600	0.06%	NEW
61	Schonfeld Strategic Advisors LLC	39,91739,917	$115,359	0.06%	NEW
62	AlphaCore Capital LLC	37,75037,750	$109,098	0.06%	—
63	CITIGROUP INC	33,51333,513	$96,853	0.05%	NEW
64	Quadrature Capital Ltd	32,62932,629	$94,298	0.05%	TRIM -88%
65	Brevan Howard Capital Management LP	32,07932,079	$92,708	0.05%	NEW
66	Corient Private Wealth LLC	31,82031,820	$91,960	0.05%	ADD 35%
67	SEI INVESTMENTS CO	31,31831,318	$90,509	0.05%	—
68	AMERICAN CENTURY COMPANIES INC	30,55630,556	$88,307	0.05%	NEW
69	Velan Capital Investment Management LP	30,00030,000	$86,700	0.05%	NEW
70	BNP PARIBAS FINANCIAL MARKETS	27,62527,625	$79,836	0.04%	ADD 3881%
71	Lantern Wealth Advisors, LLC	26,70026,700	$77,163	0.04%	NEW
72	XML Financial, LLC	24,83624,836	$71,775	0.04%	—
73	Vanguard Global Advisers, LLC	22,82022,820	$65,950	0.04%	NEW
74	JPMORGAN CHASE & CO	23,77523,775	$65,619	0.04%	ADD 313%
75	PRUDENTIAL FINANCIAL INC	22,60022,600	$65,314	0.04%	—
76	Rangeley Capital, LLC	21,50021,500	$62,135	0.03%	TRIM -29%
77	Susquehanna Portfolio Strategies, LLC	18,38218,382	$53,124	0.03%	NEW
78	BOOTHBAY FUND MANAGEMENT, LLC	18,33418,334	$52,985	0.03%	—
79	Catalyst Funds Management Pty Ltd	17,70017,700	$51,153	0.03%	NEW
80	Evercore Wealth Management, LLC	17,54317,543	$50,699	0.03%	—
81	STIFEL FINANCIAL CORP	16,63316,633	$48,070	0.03%	NEW
82	TUDOR INVESTMENT CORP ET AL	16,42916,429	$47,480	0.03%	—
83	Vanguard Personalized Indexing Management, LLC	15,15215,152	$43,789	0.02%	ADD 19%
84	R Squared Ltd	15,11715,117	$43,688	0.02%	TRIM -5%
85	Seven Fleet Capital Management LP	13,38713,387	$38,688	0.02%	NEW
86	SANDERS MORRIS HARRIS LLC	12,34512,345	$35,677	0.02%	NEW
87	Graham Capital Management, L.P.	11,12211,122	$32,143	0.02%	NEW
88	Universal- Beteiligungs- und Servicegesellschaft mbH	10,00010,000	$28,900	0.02%	TRIM -97%
89	Sound Income Strategies, LLC	7,2627,262	$21,060	0.01%	—
90	OSAIC HOLDINGS, INC.	6,1356,135	$17,725	0.01%	TRIM -5%
91	SIMPLEX TRADING, LLC	4,7644,764	$13,767	0.01%	TRIM -7%
92	MAI Capital Management	4,4154,415	$12,760	0.01%	NEW
93	WELLS FARGO & COMPANY/MN	3,0003,000	$8,670	0.00%	—
94	Russell Investments Group, Ltd.	1,4431,443	$4,172	0.00%	ADD 13%
95	IMG Wealth Management, Inc.	1,1501,150	$3,324	0.00%	—
96	Spire Wealth Management	664664	$1,919	0.00%	—
97	Cornerstone Planning Group LLC	560560	$1,764	0.00%	—
98	HighMark Wealth Management LLC	400400	$1,156	0.00%	—
99	NISA INVESTMENT ADVISORS, LLC	347347	$1,003	0.00%	—
100	Fortitude Family Office, LLC	276276	$798	0.00%	NEW

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

ARMISTICE CAPITAL, LLC

6.3M

6.0M

6.3M

6.0M

$17M

RENAISSANCE TECHNOLOGIES LLC

539K

1.2M

1.3M

1.7M

2.9M

3.0M

$9M

MILLENNIUM MANAGEMENT LLC

2.9M

1.7M

2.0M

2.1M

2.0M

2.8M

$8M

VANGUARD CAPITAL MANAGEMENT LLC

—

2.7M

$8M

ACADIAN ASSET MANAGEMENT LLC

1.3M

2.3M

2.5M

$7M

TWO SIGMA INVESTMENTS, LP

861K

655K

407K

437K

999K

2.5M

$7M

BANK OF AMERICA CORP /DE/

201K

189K

170K

209K

1.8M

2.4M

$7M

MARSHALL WACE, LLP

394K

299K

406K

630K

1.3M

2.0M

$6M

RA CAPITAL MANAGEMENT, L.P.

—

1.9M

$5M

WASATCH ADVISORS LP

3.5M

3.3M

2.0M

1.8M

1.6M

$5M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

1.2M

$3M

BlackRock, Inc.

5.1M

4.9M

1.8M

1.5M

1.2M

$3M

D. E. Shaw & Co., Inc.

—

29K

101K

222K

757K

1.1M

$3M

Connor, Clark & Lunn Investment Management Ltd.

745K

816K

682K

711K

819K

867K

$3M

CITADEL ADVISORS LLC

—

172K

494K

1.0M

783K

$2M

Shares reported each quarter by the largest current holders. Green = added vs the prior filing, red = trimmed, grey = roughly held; a dash is a quarter with no 13F on file (a gap is skipped, not read as an exit). 13F is filed up to 45 days after quarter-end. Up to 40 quarters (10 years) available — use the selector above.

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	109	43,169,311	67.9%	$125M
2025-Q4	88	39,884,440	62.7%	$64M

Short interest has its own tab now — open SI →

Source: SEC Form 13F — every institution manager (≥ $100M in 13F securities) reporting a long US-listed position, across ~10,250 filers over 10 years of history. 13F is long-only, US-listed, filed up to 45 days after quarter-end.

Activists & large holders· Schedule 13D/G beneficial owners · MGNX

Large holders — 13G, passive (top 1 by % of class)

Holder

% of class

Type

As of

MILLENNIUM MANAGEMENT LLC

3.7%

Passive

2026-06-30

SEC →

Source: SEC Schedule 13D/13G structured XML. 13D = active intent; 13G filers report passively (Rule 13d-1(b) QII / 13d-1(c) Passive / 13d-1(d) Exempt) and are not activists. Percent and delta are the group aggregate the filing reports. Structured 13D/G coverage begins December 2024 (SEC XML mandate).

Institutional ownership· 13F filers holding MGNX · 2026-Q1 methodology → sources →

109 holders

% of shares outstanding held

67.9%

Shares held (13F)

43,169,311

Reporting holders

109

Top holders

largest 100 of 109 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	ARMISTICE CAPITAL, LLC	6,012,0006.0M	$17M	9.46%	TRIM -5%
2	RENAISSANCE TECHNOLOGIES LLC	2,963,5593.0M	$9M	4.66%	—
3	MILLENNIUM MANAGEMENT LLC	2,794,3572.8M	$8M	4.40%	ADD 42%
4	VANGUARD CAPITAL MANAGEMENT LLC	2,653,8532.7M	$8M	4.18%	NEW†
5	ACADIAN ASSET MANAGEMENT LLC	2,544,0002.5M	$7M	4.00%	—
6	TWO SIGMA INVESTMENTS, LP	2,527,8292.5M	$7M	3.98%	ADD 153%
7	BANK OF AMERICA CORP /DE/	2,401,8142.4M	$7M	3.78%	ADD 31%
8	MARSHALL WACE, LLP	2,025,5262.0M	$6M	3.19%	ADD 58%
9	RA CAPITAL MANAGEMENT, L.P.	1,864,1761.9M	$5M	2.93%	NEW†
10	WASATCH ADVISORS LP	1,559,7011.6M	$5M	2.45%	TRIM -13%
11	VANGUARD PORTFOLIO MANAGEMENT LLC	1,208,7751.2M	$3M	1.90%	NEW
12	BlackRock, Inc.	1,163,1461.2M	$3M	1.83%	—
13	D. E. Shaw & Co., Inc.	1,058,4241.1M	$3M	1.67%	ADD 40%
14	Connor, Clark & Lunn Investment Management Ltd.	867,249867,249	$3M	1.36%	ADD 6%
15	CITADEL ADVISORS LLC	782,618782,618	$2M	1.23%	TRIM -24%
16	GEODE CAPITAL MANAGEMENT, LLC	697,321697,321	$2M	1.10%	ADD 6%
17	JANE STREET GROUP, LLC	608,509608,509	$2M	0.96%	TRIM -52%
18	DIADEMA PARTNERS LP	600,000600,000	$2M	0.94%	NEW
19	MACKENZIE FINANCIAL CORP	597,442597,442	$2M	0.94%	ADD 187%
20	Affinity Asset Advisors, LLC	500,000500,000	$1M	0.79%	ADD 3%
21	SUSQUEHANNA INTERNATIONAL GROUP, LLP	452,227452,227	$1M	0.71%	ADD 560%
22	JACOBS LEVY EQUITY MANAGEMENT, INC	441,143441,143	$1M	0.69%	TRIM -51%
23	NOMURA ASSET MANAGEMENT INTERNATIONAL INC.	420,000420,000	$1M	0.66%	—
24	GSA CAPITAL PARTNERS LLP	379,647379,647	$1M	0.60%	TRIM -26%
25	VANGUARD FIDUCIARY TRUST CO	340,089340,089	$982,857	0.54%	NEW
26	Walleye Capital LLC	335,265335,265	$968,916	0.53%	ADD 910%
27	UBS Group AG	296,086296,086	$855,689	0.47%	ADD 148%
28	STATE STREET CORP	293,687293,687	$848,755	0.46%	ADD 7%
29	Vestal Point Capital, LP	280,000280,000	$809,200	0.44%	—
30	PINNACLE ASSOCIATES LTD	279,121279,121	$806,660	0.44%	TRIM -5%
31	GOLDMAN SACHS GROUP INC	273,478273,478	$790,351	0.43%	ADD 51%
32	DIMENSIONAL FUND ADVISORS LP	251,803251,803	$727,278	0.40%	ADD 34%
33	Amundi	214,278214,278	$619,263	0.34%	—
34	Point72 Asset Management, L.P.	208,583208,583	$602,805	0.33%	TRIM -16%
35	Qube Research & Technologies Ltd	187,464187,464	$541,771	0.29%	NEW
36	PANAGORA ASSET MANAGEMENT INC	184,910184,910	$534,390	0.29%	ADD 23%
37	Squarepoint Ops LLC	183,847183,847	$531,318	0.29%	TRIM -41%
38	XTX Topco Ltd	177,825177,825	$513,914	0.28%	TRIM -26%
39	MORGAN STANLEY	169,112169,112	$488,734	0.27%	ADD 5%
40	LPL Financial LLC	159,700159,700	$461,533	0.25%	ADD 145%
41	NORTHERN TRUST CORP	152,282152,282	$440,095	0.24%	—
42	Persistent Asset Partners Ltd	151,728151,728	$438,494	0.24%	NEW
43	Invesco Ltd.	112,373112,373	$324,758	0.18%	—
44	CANADA PENSION PLAN INVESTMENT BOARD	106,400106,400	$307,496	0.17%	TRIM -31%
45	Hudson Bay Capital Management LP	104,754104,754	$302,739	0.16%	NEW
46	Marex Group plc	100,000100,000	$289,000	0.16%	NEW
47	AXQ CAPITAL, LP	78,85078,850	$227,877	0.12%	NEW
48	AMERIPRISE FINANCIAL INC	77,26777,267	$223,301	0.12%	TRIM -17%
49	Ikarian Capital, LLC	74,89374,893	$216,441	0.12%	—
50	BRIDGEWAY CAPITAL MANAGEMENT, LLC	73,50073,500	$212,415	0.12%	TRIM -9%
51	BARCLAYS PLC	62,62762,627	$180,992	0.10%	ADD 51%
52	FMR LLC	60,74860,748	$175,562	0.10%	TRIM -2%
53	HRT FINANCIAL LP	54,73354,733	$158,000	0.09%	TRIM -71%
54	Leonteq Securities AG	50,00050,000	$144,500	0.08%	TRIM -50%
55	OMERS ADMINISTRATION Corp	49,90049,900	$144,211	0.08%	NEW
56	Man Group plc	48,01248,012	$138,755	0.08%	NEW
57	Headlands Technologies LLC	47,53147,531	$137,365	0.07%	NEW
58	PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO	42,38242,382	$122,484	0.07%	—
59	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	40,05140,051	$115,747	0.06%	NEW
60	ADAR1 Capital Management, LLC	40,00040,000	$115,600	0.06%	NEW
61	Schonfeld Strategic Advisors LLC	39,91739,917	$115,359	0.06%	NEW
62	AlphaCore Capital LLC	37,75037,750	$109,098	0.06%	—
63	CITIGROUP INC	33,51333,513	$96,853	0.05%	NEW
64	Quadrature Capital Ltd	32,62932,629	$94,298	0.05%	TRIM -88%
65	Brevan Howard Capital Management LP	32,07932,079	$92,708	0.05%	NEW
66	Corient Private Wealth LLC	31,82031,820	$91,960	0.05%	ADD 35%
67	SEI INVESTMENTS CO	31,31831,318	$90,509	0.05%	—
68	AMERICAN CENTURY COMPANIES INC	30,55630,556	$88,307	0.05%	NEW
69	Velan Capital Investment Management LP	30,00030,000	$86,700	0.05%	NEW
70	BNP PARIBAS FINANCIAL MARKETS	27,62527,625	$79,836	0.04%	ADD 3881%
71	Lantern Wealth Advisors, LLC	26,70026,700	$77,163	0.04%	NEW
72	XML Financial, LLC	24,83624,836	$71,775	0.04%	—
73	Vanguard Global Advisers, LLC	22,82022,820	$65,950	0.04%	NEW
74	JPMORGAN CHASE & CO	23,77523,775	$65,619	0.04%	ADD 313%
75	PRUDENTIAL FINANCIAL INC	22,60022,600	$65,314	0.04%	—
76	Rangeley Capital, LLC	21,50021,500	$62,135	0.03%	TRIM -29%
77	Susquehanna Portfolio Strategies, LLC	18,38218,382	$53,124	0.03%	NEW
78	BOOTHBAY FUND MANAGEMENT, LLC	18,33418,334	$52,985	0.03%	—
79	Catalyst Funds Management Pty Ltd	17,70017,700	$51,153	0.03%	NEW
80	Evercore Wealth Management, LLC	17,54317,543	$50,699	0.03%	—
81	STIFEL FINANCIAL CORP	16,63316,633	$48,070	0.03%	NEW
82	TUDOR INVESTMENT CORP ET AL	16,42916,429	$47,480	0.03%	—
83	Vanguard Personalized Indexing Management, LLC	15,15215,152	$43,789	0.02%	ADD 19%
84	R Squared Ltd	15,11715,117	$43,688	0.02%	TRIM -5%
85	Seven Fleet Capital Management LP	13,38713,387	$38,688	0.02%	NEW
86	SANDERS MORRIS HARRIS LLC	12,34512,345	$35,677	0.02%	NEW
87	Graham Capital Management, L.P.	11,12211,122	$32,143	0.02%	NEW
88	Universal- Beteiligungs- und Servicegesellschaft mbH	10,00010,000	$28,900	0.02%	TRIM -97%
89	Sound Income Strategies, LLC	7,2627,262	$21,060	0.01%	—
90	OSAIC HOLDINGS, INC.	6,1356,135	$17,725	0.01%	TRIM -5%
91	SIMPLEX TRADING, LLC	4,7644,764	$13,767	0.01%	TRIM -7%
92	MAI Capital Management	4,4154,415	$12,760	0.01%	NEW
93	WELLS FARGO & COMPANY/MN	3,0003,000	$8,670	0.00%	—
94	Russell Investments Group, Ltd.	1,4431,443	$4,172	0.00%	ADD 13%
95	IMG Wealth Management, Inc.	1,1501,150	$3,324	0.00%	—
96	Spire Wealth Management	664664	$1,919	0.00%	—
97	Cornerstone Planning Group LLC	560560	$1,764	0.00%	—
98	HighMark Wealth Management LLC	400400	$1,156	0.00%	—
99	NISA INVESTMENT ADVISORS, LLC	347347	$1,003	0.00%	—
100	Fortitude Family Office, LLC	276276	$798	0.00%	NEW

† a filer this large appearing as NEW usually reflects a renamed or succeeded filing entity (the old name stops filing the same quarter) — not a brand-new position.

Rows rank by the value each filer reported — 13F filers price their own positions, so a holder with fewer shares can rank just above one with more.

Holder trends· top 15 holders · shares held over 6 quarters

green added · red trimmed

Holder

2024-Q4

2025-Q1

2025-Q2

2025-Q3

2025-Q4

2026-Q1

Latest value

ARMISTICE CAPITAL, LLC

6.3M

6.0M

6.3M

6.0M

$17M

RENAISSANCE TECHNOLOGIES LLC

539K

1.2M

1.3M

1.7M

2.9M

3.0M

$9M

MILLENNIUM MANAGEMENT LLC

2.9M

1.7M

2.0M

2.1M

2.0M

2.8M

$8M

VANGUARD CAPITAL MANAGEMENT LLC

—

2.7M

$8M

ACADIAN ASSET MANAGEMENT LLC

1.3M

2.3M

2.5M

$7M

TWO SIGMA INVESTMENTS, LP

861K

655K

407K

437K

999K

2.5M

$7M

BANK OF AMERICA CORP /DE/

201K

189K

170K

209K

1.8M

2.4M

$7M

MARSHALL WACE, LLP

394K

299K

406K

630K

1.3M

2.0M

$6M

RA CAPITAL MANAGEMENT, L.P.

—

1.9M

$5M

WASATCH ADVISORS LP

3.5M

3.3M

2.0M

1.8M

1.6M

$5M

VANGUARD PORTFOLIO MANAGEMENT LLC

—

1.2M

$3M

BlackRock, Inc.

5.1M

4.9M

1.8M

1.5M

1.2M

$3M

D. E. Shaw & Co., Inc.

—

29K

101K

222K

757K

1.1M

$3M

Connor, Clark & Lunn Investment Management Ltd.

745K

816K

682K

711K

819K

867K

$3M

CITADEL ADVISORS LLC

—

172K

494K

1.0M

783K

$2M

Institutional footprint by quarter

Line breaks are honest gaps — quarters with no 13F record, or a suppressed % — never interpolated. % of shares outstanding uses today's share count for every quarter (the only count stored).

Quarter	Holders	Shares held	% shares out	Value held
2026-Q1	109	43,169,311	67.9%	$125M
2025-Q4	88	39,884,440	62.7%	$64M

Short interest has its own tab now — open SI →

Activists & large holders· Schedule 13D/G beneficial owners · MGNX

Large holders — 13G, passive (top 1 by % of class)

Holder

% of class

Type

As of

MILLENNIUM MANAGEMENT LLC

3.7%

Passive

2026-06-30

SEC →

MGNX US Equity☆

Institutional ownership· 13F filers holding MGNX · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · MGNX

Institutional ownership· 13F filers holding MGNX · 2026-Q1 methodology → sources →

Top holders

Holder trends· top 15 holders · shares held over 6 quarters

Institutional footprint by quarter

Activists & large holders· Schedule 13D/G beneficial owners · MGNX

MGNX US Equity