IMRX US Equity

Immuneering Corp

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Health Care · Pharmaceutical Preparations · CIK 1790340 · FYE 1231

$4.24

-0.12 (-2.75%)

USD · as of 2026-07-28 · marketstack

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

95 holders

% of shares outstanding held

66.3%

Shares held (13F)

29,168,383

Reporting holders

Top holders

largest 95 of 95 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	9,697,9389.7M	$51M	22.03%	—
2	Sanofi	2,708,5592.7M	$14M	6.15%	—
3	VANGUARD CAPITAL MANAGEMENT LLC	2,288,3412.3M	$12M	5.20%	NEW†
4	MARSHALL WACE, LLP	1,996,5852.0M	$11M	4.54%	ADD 180%
5	PRICE T ROWE ASSOCIATES INC /MD/	1,829,1881.8M	$10M	4.16%	TRIM -8%
6	BlackRock, Inc.	1,507,2581.5M	$8M	3.42%	ADD 4%
7	MILLENNIUM MANAGEMENT LLC	1,102,7121.1M	$6M	2.51%	ADD 2065%
8	GEODE CAPITAL MANAGEMENT, LLC	637,944637,944	$3M	1.45%	ADD 3%
9	Occam Crest Management LP	545,098545,098	$3M	1.24%	ADD 9%
10	CITADEL ADVISORS LLC	447,278447,278	$2M	1.02%	ADD 394%
11	Connor, Clark & Lunn Investment Management Ltd.	400,363400,363	$2M	0.91%	ADD 202%
12	Summit Financial, LLC	376,749376,749	$2M	0.86%	NEW
13	UBS Group AG	376,284376,284	$2M	0.85%	ADD 98%
14	GOLDMAN SACHS GROUP INC	327,655327,655	$2M	0.74%	ADD 3%
15	VANGUARD FIDUCIARY TRUST CO	322,038322,038	$2M	0.73%	NEW
16	Burkehill Global Management, LP	300,000300,000	$2M	0.68%	—
17	MORGAN STANLEY	296,067296,067	$2M	0.67%	TRIM -40%
18	STATE STREET CORP	268,520268,520	$1M	0.61%	TRIM -89%
19	TWO SIGMA INVESTMENTS, LP	244,771244,771	$1M	0.56%	ADD 18%
20	Squarepoint Ops LLC	226,046226,046	$1M	0.51%	ADD 145%
21	Diametric Capital, LP	174,897174,897	$921,707	0.40%	TRIM -29%
22	WELLINGTON MANAGEMENT GROUP LLP	156,424156,424	$824,355	0.36%	NEW
23	BANK OF AMERICA CORP /DE/	150,847150,847	$794,963	0.34%	TRIM -30%
24	683 Capital Management, LLC	150,697150,697	$794,173	0.34%	—
25	DCF Advisers, LLC	141,462141,462	$745,505	0.32%	TRIM -34%
26	HighTower Advisors, LLC	131,286131,286	$691,877	0.30%	ADD 18%
27	Prosight Management, LP	123,409123,409	$650,365	0.28%	NEW
28	Kingsview Wealth Management, LLC	122,200122,200	$643,994	0.28%	ADD 3%
29	BARCLAYS PLC	121,978121,978	$642,825	0.28%	TRIM -47%
30	BRIDGEWAY CAPITAL MANAGEMENT, LLC	118,149118,149	$622,645	0.27%	—
31	NORTHERN TRUST CORP	117,666117,666	$620,100	0.27%	ADD 8%
32	SUSQUEHANNA INTERNATIONAL GROUP, LLP	105,507105,507	$556,022	0.24%	—
33	Hudson Bay Capital Management LP	95,88995,889	$505,335	0.22%	ADD 13%
34	TD Asset Management Inc	94,34094,340	$497,172	0.21%	TRIM -20%
35	Weiss Asset Management LP	87,98587,985	$463,681	0.20%	NEW
36	Brevan Howard Capital Management LP	86,23686,236	$454,463	0.20%	NEW
37	JANE STREET GROUP, LLC	77,41477,414	$407,971	0.18%	TRIM -24%
38	GSA CAPITAL PARTNERS LLP	76,75276,752	$404,000	0.17%	NEW
39	RENAISSANCE TECHNOLOGIES LLC	72,87572,875	$384,051	0.17%	TRIM -52%
40	MANUFACTURERS LIFE INSURANCE COMPANY, THE	69,73869,738	$367,519	0.16%	—
41	LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	67,49567,495	$355,699	0.15%	TRIM -18%
42	Clearstead Advisors, LLC	60,86560,865	$320,759	0.14%	NEW
43	Flower City Capital	55,02955,029	$290,003	0.13%	ADD 30%
44	HRT FINANCIAL LP	42,45642,456	$223,000	0.10%	NEW
45	CITIGROUP INC	40,41740,417	$212,998	0.09%	ADD 8%
46	HSBC HOLDINGS PLC	37,77137,771	$197,542	0.09%	NEW
47	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	37,34437,344	$196,803	0.08%	ADD 67%
48	AMERICAN CENTURY COMPANIES INC	34,22434,224	$180,360	0.08%	NEW
49	OPPENHEIMER & CO INC	34,00034,000	$179,180	0.08%	NEW
50	PRELUDE CAPITAL MANAGEMENT, LLC	29,21929,219	$153,984	0.07%	TRIM -63%
51	Berman McAleer LLC	25,00025,000	$131,750	0.06%	—
52	LPL Financial LLC	24,34524,345	$128,298	0.06%	TRIM -16%
53	FIRST MANHATTAN CO. LLC.	24,24524,245	$127,771	0.06%	—
54	Vanguard Global Advisers, LLC	24,24324,243	$127,761	0.06%	NEW
55	CIBC Bancorp USA Inc.	23,50023,500	$123,845	0.05%	NEW
56	ALETHEA CAPITAL MANAGEMENT, LLC	22,93522,935	$120,867	0.05%	—
57	OMERS ADMINISTRATION Corp	22,40022,400	$118,048	0.05%	TRIM -53%
58	ENVESTNET ASSET MANAGEMENT INC	21,86321,863	$115,218	0.05%	NEW
59	GREAT VALLEY ADVISOR GROUP, INC.	21,12021,120	$111,670	0.05%	ADD 11%
60	PNC FINANCIAL SERVICES GROUP, INC.	20,00020,000	$105,400	0.05%	—
61	FNY Investment Advisers, LLC	20,00020,000	$105,000	0.05%	NEW
62	Future Financial Wealth Managment LLC	18,00018,000	$103,500	0.04%	—
63	DIMENSIONAL FUND ADVISORS LP	19,56219,562	$103,092	0.04%	—
64	Palumbo Wealth Management LLC	18,67018,670	$98,391	0.04%	TRIM -70%
65	NATIONS FINANCIAL GROUP INC, /IA/ /ADV	17,00017,000	$89,590	0.04%	ADD 6%
66	WELLS FARGO & COMPANY/MN	16,80016,800	$88,536	0.04%	ADD 12%
67	Schonfeld Strategic Advisors LLC	15,90015,900	$83,793	0.04%	NEW
68	Kelsey Financial, LLC	15,09915,099	$79,572	0.03%	ADD 7%
69	WENDELL DAVID ASSOCIATES INC	15,00015,000	$79,000	0.03%	—
70	Y-Intercept (Hong Kong) Ltd	14,28014,280	$75,256	0.03%	NEW
71	Catalyst Funds Management Pty Ltd	12,80012,800	$67,456	0.03%	NEW
72	Cetera Investment Advisers	12,64912,649	$66,660	0.03%	NEW
73	Jump Financial, LLC	12,25012,250	$64,558	0.03%	NEW
74	China Universal Asset Management Co., Ltd.	11,45811,458	$60,384	0.03%	TRIM -26%
75	Ausdal Financial Partners, Inc.	11,00011,000	$57,970	0.02%	—
76	Atria Investments, Inc	10,75810,758	$56,695	0.02%	NEW
77	Thayer Partners, LLC / MA	11,00011,000	$53,680	0.02%	—
78	LEVIN CAPITAL STRATEGIES, L.P.	10,00010,000	$52,700	0.02%	NEW
79	Moors & Cabot, Inc.	10,00010,000	$52,700	0.02%	—
80	Tidemark, LLC	10,00010,000	$52,700	0.02%	TRIM -50%
81	Caitong International Asset Management Co., Ltd	9,1519,151	$48,226	0.02%	ADD 83%
82	SIMPLEX TRADING, LLC	8,9428,942	$47,124	0.02%	TRIM -31%
83	JPMORGAN CHASE & CO	6,4196,419	$31,325	0.01%	TRIM -5%
84	Tower Research Capital LLC (TRC)	5,0585,058	$26,656	0.01%	ADD 4627%
85	Mirae Asset Global Investments Co., Ltd.	3,3683,368	$17,749	0.01%	ADD 7%
86	GROUP ONE TRADING LLC	3,0293,029	$15,963	0.01%	NEW
87	BNP PARIBAS FINANCIAL MARKETS	2,2762,276	$11,995	0.01%	—
88	Quantbot Technologies LP	1,6321,632	$8,601	0.00%	NEW
89	GF FUND MANAGEMENT CO. LTD.	1,4421,442	$7,599	0.00%	ADD 14%
90	NATIXIS	380380	$2,003	0.00%	NEW
91	EverSource Wealth Advisors, LLC	345345	$1,818	0.00%	—
92	ROYAL BANK OF CANADA	360360	$1,000	0.00%	NEW
93	Fortitude Family Office, LLC	105105	$553	0.00%	NEW
94	JONES FINANCIAL COMPANIES LLLP	3030	$149	0.00%	—
95	OSAIC HOLDINGS, INC.	44	$21	0.00%	TRIM -100%

† 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

FMR LLC

—

221K

8.8M

9.7M

$51M

Sanofi

—

2.7M

$14M

VANGUARD CAPITAL MANAGEMENT LLC

—

2.3M

$12M

MARSHALL WACE, LLP

21K

808K

574K

271K

712K

2.0M

$11M

PRICE T ROWE ASSOCIATES INC /MD/

767K

659K

—

1.8M

2.0M

1.8M

$10M

BlackRock, Inc.

319K

317K

423K

681K

1.5M

$8M

MILLENNIUM MANAGEMENT LLC

103K

23K

62K

237K

51K

1.1M

$6M

GEODE CAPITAL MANAGEMENT, LLC

208K

226K

230K

514K

618K

638K

$3M

Occam Crest Management LP

—

498K

545K

$3M

CITADEL ADVISORS LLC

—

943K

90K

447K

$2M

Connor, Clark & Lunn Investment Management Ltd.

—

133K

400K

$2M

Summit Financial, LLC

—

377K

$2M

UBS Group AG

52K

29K

126K

190K

376K

$2M

GOLDMAN SACHS GROUP INC

—

319K

328K

$2M

VANGUARD FIDUCIARY TRUST CO

—

322K

$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	95	29,168,383	66.3%	$154M
2025-Q4	86	31,747,246	72.1%	$209M
2025-Q3	68	26,043,462	59.2%	$182M
2025-Q2	39	3,850,601	8.7%	$13M
2025-Q1	35	4,498,584	10.2%	$7M
2024-Q4	42	4,302,451	9.8%	$9M
2024-Q3	38	4,357,735	9.9%	$11M
2024-Q2	59	9,596,320	21.8%	$12M
2024-Q1	51	11,972,081	27.2%	$35M
2023-Q4	52	16,202,898	36.8%	$119M
2023-Q3	52	16,940,765	38.5%	$130M

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 · IMRX

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

Holder

% of class

Type

As of

BlackRock, Inc.

6.7%

QII

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 IMRX · 2026-Q1 methodology → sources →

95 holders

% of shares outstanding held

66.3%

Shares held (13F)

29,168,383

Reporting holders

Top holders

largest 95 of 95 · Δ vs 2025-Q4

#	Holder	Shares	Value	% of shares out	Δ QoQ
1	FMR LLC	9,697,9389.7M	$51M	22.03%	—
2	Sanofi	2,708,5592.7M	$14M	6.15%	—
3	VANGUARD CAPITAL MANAGEMENT LLC	2,288,3412.3M	$12M	5.20%	NEW†
4	MARSHALL WACE, LLP	1,996,5852.0M	$11M	4.54%	ADD 180%
5	PRICE T ROWE ASSOCIATES INC /MD/	1,829,1881.8M	$10M	4.16%	TRIM -8%
6	BlackRock, Inc.	1,507,2581.5M	$8M	3.42%	ADD 4%
7	MILLENNIUM MANAGEMENT LLC	1,102,7121.1M	$6M	2.51%	ADD 2065%
8	GEODE CAPITAL MANAGEMENT, LLC	637,944637,944	$3M	1.45%	ADD 3%
9	Occam Crest Management LP	545,098545,098	$3M	1.24%	ADD 9%
10	CITADEL ADVISORS LLC	447,278447,278	$2M	1.02%	ADD 394%
11	Connor, Clark & Lunn Investment Management Ltd.	400,363400,363	$2M	0.91%	ADD 202%
12	Summit Financial, LLC	376,749376,749	$2M	0.86%	NEW
13	UBS Group AG	376,284376,284	$2M	0.85%	ADD 98%
14	GOLDMAN SACHS GROUP INC	327,655327,655	$2M	0.74%	ADD 3%
15	VANGUARD FIDUCIARY TRUST CO	322,038322,038	$2M	0.73%	NEW
16	Burkehill Global Management, LP	300,000300,000	$2M	0.68%	—
17	MORGAN STANLEY	296,067296,067	$2M	0.67%	TRIM -40%
18	STATE STREET CORP	268,520268,520	$1M	0.61%	TRIM -89%
19	TWO SIGMA INVESTMENTS, LP	244,771244,771	$1M	0.56%	ADD 18%
20	Squarepoint Ops LLC	226,046226,046	$1M	0.51%	ADD 145%
21	Diametric Capital, LP	174,897174,897	$921,707	0.40%	TRIM -29%
22	WELLINGTON MANAGEMENT GROUP LLP	156,424156,424	$824,355	0.36%	NEW
23	BANK OF AMERICA CORP /DE/	150,847150,847	$794,963	0.34%	TRIM -30%
24	683 Capital Management, LLC	150,697150,697	$794,173	0.34%	—
25	DCF Advisers, LLC	141,462141,462	$745,505	0.32%	TRIM -34%
26	HighTower Advisors, LLC	131,286131,286	$691,877	0.30%	ADD 18%
27	Prosight Management, LP	123,409123,409	$650,365	0.28%	NEW
28	Kingsview Wealth Management, LLC	122,200122,200	$643,994	0.28%	ADD 3%
29	BARCLAYS PLC	121,978121,978	$642,825	0.28%	TRIM -47%
30	BRIDGEWAY CAPITAL MANAGEMENT, LLC	118,149118,149	$622,645	0.27%	—
31	NORTHERN TRUST CORP	117,666117,666	$620,100	0.27%	ADD 8%
32	SUSQUEHANNA INTERNATIONAL GROUP, LLP	105,507105,507	$556,022	0.24%	—
33	Hudson Bay Capital Management LP	95,88995,889	$505,335	0.22%	ADD 13%
34	TD Asset Management Inc	94,34094,340	$497,172	0.21%	TRIM -20%
35	Weiss Asset Management LP	87,98587,985	$463,681	0.20%	NEW
36	Brevan Howard Capital Management LP	86,23686,236	$454,463	0.20%	NEW
37	JANE STREET GROUP, LLC	77,41477,414	$407,971	0.18%	TRIM -24%
38	GSA CAPITAL PARTNERS LLP	76,75276,752	$404,000	0.17%	NEW
39	RENAISSANCE TECHNOLOGIES LLC	72,87572,875	$384,051	0.17%	TRIM -52%
40	MANUFACTURERS LIFE INSURANCE COMPANY, THE	69,73869,738	$367,519	0.16%	—
41	LANDSCAPE CAPITAL MANAGEMENT, L.L.C.	67,49567,495	$355,699	0.15%	TRIM -18%
42	Clearstead Advisors, LLC	60,86560,865	$320,759	0.14%	NEW
43	Flower City Capital	55,02955,029	$290,003	0.13%	ADD 30%
44	HRT FINANCIAL LP	42,45642,456	$223,000	0.10%	NEW
45	CITIGROUP INC	40,41740,417	$212,998	0.09%	ADD 8%
46	HSBC HOLDINGS PLC	37,77137,771	$197,542	0.09%	NEW
47	CHARLES SCHWAB INVESTMENT MANAGEMENT INC	37,34437,344	$196,803	0.08%	ADD 67%
48	AMERICAN CENTURY COMPANIES INC	34,22434,224	$180,360	0.08%	NEW
49	OPPENHEIMER & CO INC	34,00034,000	$179,180	0.08%	NEW
50	PRELUDE CAPITAL MANAGEMENT, LLC	29,21929,219	$153,984	0.07%	TRIM -63%
51	Berman McAleer LLC	25,00025,000	$131,750	0.06%	—
52	LPL Financial LLC	24,34524,345	$128,298	0.06%	TRIM -16%
53	FIRST MANHATTAN CO. LLC.	24,24524,245	$127,771	0.06%	—
54	Vanguard Global Advisers, LLC	24,24324,243	$127,761	0.06%	NEW
55	CIBC Bancorp USA Inc.	23,50023,500	$123,845	0.05%	NEW
56	ALETHEA CAPITAL MANAGEMENT, LLC	22,93522,935	$120,867	0.05%	—
57	OMERS ADMINISTRATION Corp	22,40022,400	$118,048	0.05%	TRIM -53%
58	ENVESTNET ASSET MANAGEMENT INC	21,86321,863	$115,218	0.05%	NEW
59	GREAT VALLEY ADVISOR GROUP, INC.	21,12021,120	$111,670	0.05%	ADD 11%
60	PNC FINANCIAL SERVICES GROUP, INC.	20,00020,000	$105,400	0.05%	—
61	FNY Investment Advisers, LLC	20,00020,000	$105,000	0.05%	NEW
62	Future Financial Wealth Managment LLC	18,00018,000	$103,500	0.04%	—
63	DIMENSIONAL FUND ADVISORS LP	19,56219,562	$103,092	0.04%	—
64	Palumbo Wealth Management LLC	18,67018,670	$98,391	0.04%	TRIM -70%
65	NATIONS FINANCIAL GROUP INC, /IA/ /ADV	17,00017,000	$89,590	0.04%	ADD 6%
66	WELLS FARGO & COMPANY/MN	16,80016,800	$88,536	0.04%	ADD 12%
67	Schonfeld Strategic Advisors LLC	15,90015,900	$83,793	0.04%	NEW
68	Kelsey Financial, LLC	15,09915,099	$79,572	0.03%	ADD 7%
69	WENDELL DAVID ASSOCIATES INC	15,00015,000	$79,000	0.03%	—
70	Y-Intercept (Hong Kong) Ltd	14,28014,280	$75,256	0.03%	NEW
71	Catalyst Funds Management Pty Ltd	12,80012,800	$67,456	0.03%	NEW
72	Cetera Investment Advisers	12,64912,649	$66,660	0.03%	NEW
73	Jump Financial, LLC	12,25012,250	$64,558	0.03%	NEW
74	China Universal Asset Management Co., Ltd.	11,45811,458	$60,384	0.03%	TRIM -26%
75	Ausdal Financial Partners, Inc.	11,00011,000	$57,970	0.02%	—
76	Atria Investments, Inc	10,75810,758	$56,695	0.02%	NEW
77	Thayer Partners, LLC / MA	11,00011,000	$53,680	0.02%	—
78	LEVIN CAPITAL STRATEGIES, L.P.	10,00010,000	$52,700	0.02%	NEW
79	Moors & Cabot, Inc.	10,00010,000	$52,700	0.02%	—
80	Tidemark, LLC	10,00010,000	$52,700	0.02%	TRIM -50%
81	Caitong International Asset Management Co., Ltd	9,1519,151	$48,226	0.02%	ADD 83%
82	SIMPLEX TRADING, LLC	8,9428,942	$47,124	0.02%	TRIM -31%
83	JPMORGAN CHASE & CO	6,4196,419	$31,325	0.01%	TRIM -5%
84	Tower Research Capital LLC (TRC)	5,0585,058	$26,656	0.01%	ADD 4627%
85	Mirae Asset Global Investments Co., Ltd.	3,3683,368	$17,749	0.01%	ADD 7%
86	GROUP ONE TRADING LLC	3,0293,029	$15,963	0.01%	NEW
87	BNP PARIBAS FINANCIAL MARKETS	2,2762,276	$11,995	0.01%	—
88	Quantbot Technologies LP	1,6321,632	$8,601	0.00%	NEW
89	GF FUND MANAGEMENT CO. LTD.	1,4421,442	$7,599	0.00%	ADD 14%
90	NATIXIS	380380	$2,003	0.00%	NEW
91	EverSource Wealth Advisors, LLC	345345	$1,818	0.00%	—
92	ROYAL BANK OF CANADA	360360	$1,000	0.00%	NEW
93	Fortitude Family Office, LLC	105105	$553	0.00%	NEW
94	JONES FINANCIAL COMPANIES LLLP	3030	$149	0.00%	—
95	OSAIC HOLDINGS, INC.	44	$21	0.00%	TRIM -100%

† 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

FMR LLC

—

221K

8.8M

9.7M

$51M

Sanofi

—

2.7M

$14M

VANGUARD CAPITAL MANAGEMENT LLC

—

2.3M

$12M

MARSHALL WACE, LLP

21K

808K

574K

271K

712K

2.0M

$11M

PRICE T ROWE ASSOCIATES INC /MD/

767K

659K

—

1.8M

2.0M

1.8M

$10M

BlackRock, Inc.

319K

317K

423K

681K

1.5M

$8M

MILLENNIUM MANAGEMENT LLC

103K

23K

62K

237K

51K

1.1M

$6M

GEODE CAPITAL MANAGEMENT, LLC

208K

226K

230K

514K

618K

638K

$3M

Occam Crest Management LP

—

498K

545K

$3M

CITADEL ADVISORS LLC

—

943K

90K

447K

$2M

Connor, Clark & Lunn Investment Management Ltd.

—

133K

400K

$2M

Summit Financial, LLC

—

377K

$2M

UBS Group AG

52K

29K

126K

190K

376K

$2M

GOLDMAN SACHS GROUP INC

—

319K

328K

$2M

VANGUARD FIDUCIARY TRUST CO

—

322K

$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	95	29,168,383	66.3%	$154M
2025-Q4	86	31,747,246	72.1%	$209M
2025-Q3	68	26,043,462	59.2%	$182M
2025-Q2	39	3,850,601	8.7%	$13M
2025-Q1	35	4,498,584	10.2%	$7M
2024-Q4	42	4,302,451	9.8%	$9M
2024-Q3	38	4,357,735	9.9%	$11M
2024-Q2	59	9,596,320	21.8%	$12M
2024-Q1	51	11,972,081	27.2%	$35M
2023-Q4	52	16,202,898	36.8%	$119M
2023-Q3	52	16,940,765	38.5%	$130M

Short interest has its own tab now — open SI →

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

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

Holder

% of class

Type

As of

BlackRock, Inc.

6.7%

QII

2026-06-30

SEC →

IMRX US Equity☆

Institutional ownership· 13F filers holding IMRX · 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 · IMRX

Institutional ownership· 13F filers holding IMRX · 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 · IMRX

IMRX US Equity