$CRBU

$0.46 -$0.03 (6.4%) Close

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

Ownership

13F as of Q2 2026 · 107.2M shares outstanding

Who owns CRBU?

By type of holder

Institutions 44.8% Insiders 7.9% Everyone else 47.2%

Concentration Top 10 holders own 33.2%

BlackRock, Inc. 7.3% · Rachel E. Haurwitz 4.4%

Institutional ownership

44.8%

+9.5 pts vs last qtr

Institutional holders

135

-2 vs last qtr

Net shares bought

+10.2M

by institutions in Q2 2026

New / sold out

22 / 24

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +5.7M
Mackenzie Financial Corp +2.7M

Biggest sellers in Q2 2026

Aberdeen Group plc SOLD OUT −1.2M
Millennium Management LLC −1.0M

Who is planning to sell?

Notices of proposed sale, last 12 months

$39.2K

3 notices from 3 people

Shares covered

20.1K

0.02% of the company

Arranged in advance

69%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Ruhi Ahmad Khan Officer 10b5-1 $13.6K
Barbara G Mcclung Officer 10b5-1 $13.6K

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2021–FY2025

+194.9%

+31.05% a year

Each share's claim on the business

−66.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $58.3M

over 5 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 years57% 1–3 years25% Under 1 year19%

Quarterly turnover

30.7%

of institutional shares changed hands

Top 10 managers, median time held

4.8 years

Super Investors

Investment managers reporting CRBU on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	7.8M	7.29%	+5.7M (+264.7%)	2021	0.0%
Shares held by quarter Peak holding7.8M (Q2'26) Change over 8 quarters+582.5K Share of the company7.290% BlackRock, Inc.'s full portfolio →
P Pfizer Inc	4.7M	4.38%	Unchanged	2024	4.6%
Shares held by quarter Peak holding4.7M (Q4'24) Change over 8 quarters+4.7M Share of the company4.380% Pfizer Inc's full portfolio →

BlackRock, Inc.

7.8M

% of company

7.29%

Change vs last qtr

+5.7M (+264.7%)

Held since

2021

Pfizer Inc

4.7M

% of company

4.38%

Change vs last qtr

Unchanged

Held since

2024

28 more super investors behind a free account

See every manager holding Caribou Biosciences, Inc., how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CRBU on Form N-PORT; together they hold 13.9% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$5.3M	3.0M	2.81%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$4.03M	2.3M	2.14%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$5.3M

% of company

2.81%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$4.03M

% of company

2.14%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Caribou Biosciences, Inc. and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
RE Rachel E. Haurwitz 5%+ holder 13D · 5.0%	4.7M	4.40%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company4.400% Disclosed stake13D · 5.0% View the 13D/G filing →
MB Mcclung Barbara G Insider	481.6K	0.45%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.450% Mcclung Barbara G's insider activity →

Rachel E. Haurwitz

5%+ holder13D · 5.0%

4.7M

% of company

4.40%

Change vs last qtr

—

Held since

—

Mcclung Barbara G

Insider

481.6K

% of company

0.45%

Change vs last qtr

—

Held since

—

6 more holders behind a free account

See every insider and 5%+ holder of Caribou Biosciences, Inc..

Comments