$IMRX

$3.83 +$0.12 (3.23%) Close

$IMRX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 64.7M shares outstanding

Who owns IMRX?

By type of holder

Institutions 53.1% Insiders 0.0% Everyone else 46.9%

Concentration Top 10 holders own 39.0%

FMR LLC 15.0% · BlackRock, Inc. 6.8%

Institutional ownership

53.1%

+7.8 pts vs last qtr

Institutional holders

110

+15 vs last qtr

Net shares bought

+5.1M

by institutions in Q2 2026

New / sold out

37 / 22

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +2.9M
State Street Corp +733.5K

Biggest sellers in Q2 2026

Marshall Wace, LLP −1.3M
Millennium Management LLC −772.3K

Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Immuneering Corporation in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+789.1%

+54.81% a year

Each share's claim on the business

−88.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $25.5M

over 6 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years0% 3–5 years31% 1–3 years37% Under 1 year32%

Quarterly turnover

23.7%

of institutional shares changed hands

Top 10 managers, median time held

1.5 years

Super Investors

Investment managers reporting IMRX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
F FMR LLC	9.7M	15.00%	+6.7K (+0.1%)	2025	0.0%
Shares held by quarter Peak holding9.7M (Q2'26) Change over 8 quarters+9.7M Share of the company15.000% FMR LLC's full portfolio →
B BlackRock, Inc.	4.4M	6.76%	+2.9M (+190.2%)	2021	0.0%
Shares held by quarter Peak holding4.4M (Q2'26) Change over 8 quarters+4.1M Share of the company6.760% BlackRock, Inc.'s full portfolio →

FMR LLC

9.7M

% of company

15.00%

Change vs last qtr

+6.7K (+0.1%)

Held since

2025

BlackRock, Inc.

4.4M

% of company

6.76%

Change vs last qtr

+2.9M (+190.2%)

Held since

2021

28 more super investors behind a free account

See every manager holding Immuneering Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting IMRX on Form N-PORT; together they hold 21.7% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
FG Fidelity Growth Company Fund Fidelity Mt. Vernon Street Trust	$14.7M	2.9M	4.54%	0.02%	August 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$8.1M	1.6M	2.51%	0.00%	June 30, 2026

Fidelity Growth Company Fund

Fidelity Mt. Vernon Street Trust

Position value

$14.7M

% of company

4.54%

% of the fund

0.02%

As of

August 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$8.1M

% of company

2.51%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Immuneering Corporation and how much of the fund the position is.

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