$RNAC

$6.46 +$0.18 (2.87%) Close

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

Ownership

13F as of Q2 2026 · 30.3M shares outstanding

Who owns RNAC?

By type of holder

Institutions 28.7% Insiders 71.3% Everyone else 0.0%

Concentration Top 10 holders own 103.2%

Timothy A. Springer 31.6% · Murat Kalayoglu 19.3%

Institutional ownership

28.7%

+5.1 pts vs last qtr

Institutional holders

+11 vs last qtr

Net shares bought

+1.5M

by institutions in Q2 2026

New / sold out

24 / 13

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

683 Capital Management, LLC +320.0K
Aqr Capital Management LLC +272.4K

Biggest sellers in Q2 2026

FMR LLC −431.3K
Erste Asset Management GmbH −198.1K

Who is planning to sell?

Notices of proposed sale, last 12 months

$532K

5 notices from 2 people

Shares covered

76.4K

0.25% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Christopher M Jewell Former affiliate $274K
Milos Miljkovic Former affiliate $258K

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, FY2023–FY2025

+402.4%

+124.13% a year

Each share's claim on the business

−80.1%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $39.6M

over 3 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+ years32% 3–5 years3% 1–3 years12% Under 1 year52%

Quarterly turnover

25.4%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting RNAC on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
SO Squarepoint Ops LLC	2.3M	7.45%	+16.1K (+0.7%)	Q4 '25	0.0%
Shares held by quarter Peak holding2.3M (Q2'26) Change over 8 quarters+2.2M Share of the company7.450% Squarepoint Ops LLC's full portfolio →
B BlackRock, Inc.	819.2K	2.71%	+220.1K (+36.7%)	≤2021	0.0%
Shares held by quarter Peak holding819.2K (Q2'26) Change over 8 quarters+395.8K Share of the company2.710% BlackRock, Inc.'s full portfolio →

Squarepoint Ops LLC

2.3M

% of company

7.45%

Change vs last qtr

+16.1K (+0.7%)

Held since

Q4 '25

BlackRock, Inc.

819.2K

% of company

2.71%

Change vs last qtr

+220.1K (+36.7%)

Held since

≤2021

28 more super investors behind a free account

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

Institutional Funds

Mutual funds and ETFs reporting RNAC on Form N-PORT; together they hold 8.8% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$3.92M	376.3K	1.24%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$3.53M	338.6K	1.12%	0.00%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$3.92M

% of company

1.24%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$3.53M

% of company

1.12%

% of the fund

0.00%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Cartesian Therapeutics, 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
TA Timothy A. Springer 5%+ holder 13D · 36.9%	9.6M	31.58%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company31.580% Disclosed stake13D · 36.9% View the 13D/G filing →
MK Murat Kalayoglu 5%+ holder 13D · 19.9%	5.8M	19.28%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company19.280% Disclosed stake13D · 19.9% View the 13D/G filing →

Timothy A. Springer

5%+ holder13D · 36.9%

9.6M

% of company

31.58%

Change vs last qtr

—

Held since

—

Murat Kalayoglu

5%+ holder13D · 19.9%

5.8M

% of company

19.28%

Change vs last qtr

—

Held since

—

17 more holders behind a free account

See every insider and 5%+ holder of Cartesian Therapeutics, Inc..

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