Company · Ownership research

Cartesian Therapeutics, Inc. RNAC

CIK 0001453687 · CUSIP 816212302

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 816212302 (RNAC), not CUSIP 816212902 (RNAC), and does not merge CUSIPs.

This page lists the top 20 of 73 rows by value; the complete set is available through the API.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	FMR LLC CIK 315066 · Amended · View history	$30.84M 2,339,917 shares	0.00%	-83.30K(-3.40%)Reduced	SEC filing ↗ Nov 5, 2026	▾
02	MPM BIOIMPACT LLC CIK 1687078 · View history	$10.42M 790,779 shares	1.79%	+69.64K(+9.70%)Added	SEC filing ↗ May 15, 2025	▾
03	BlackRock, Inc. CIK 2012383 · View history	$8.87M 673,050 shares	0.00%	+13.65K(+2.10%)Added	SEC filing ↗ May 2, 2025	▾
04	Siren, L.L.C. CIK 2005245 · Amended · View history	$7.42M 563,272 shares	0.42%	-8.96K(-1.60%)Reduced	SEC filing ↗ May 23, 2025	▾
05	VANGUARD GROUP INC CIK 102909 · View history	$6.64M 503,537 shares	0.00%	+74.06K(+17.20%)Added	SEC filing ↗ May 9, 2025	▾
06	Erste Asset Management GmbH CIK 2024532 · View history	$3.43M 260,011 shares	0.04%	+86.44K(+49.80%)Added	SEC filing ↗ May 14, 2025	▾
07	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$2.97M 225,500 shares	0.00%	+4.24K(+1.90%)Added	SEC filing ↗ May 13, 2025	▾
08	STATE STREET CORP CIK 93751 · View history	$2.65M 201,125 shares	0.00%	+28.50K(+16.50%)Added	SEC filing ↗ May 15, 2025	▾
09	JPMORGAN CHASE & CO CIK 19617 · View history	$2.57M 195,037 shares	0.00%	-79.70K(-29.00%)Reduced	SEC filing ↗ May 12, 2025	▾
10	683 Capital Management, LLC CIK 1404574 · View history	$1.98M 150,000 shares	0.20%	+25.00K(+20.00%)Added	SEC filing ↗ May 15, 2025	▾
11	CITADEL ADVISORS LLC CIK 1423053 · View history	$1.94M 147,297 shares	0.00%	-167.70K(-53.20%)Reduced	SEC filing ↗ May 15, 2025	▾
12	NORTHERN TRUST CORP CIK 73124 · View history	$1.22M 92,337 shares	0.00%	-2.69K(-2.80%)Reduced	SEC filing ↗ May 13, 2025	▾
13	MARSHALL WACE, LLP CIK 1318757 · View history	$508.81K 38,605 shares	0.00%	+38.60KNew	SEC filing ↗ May 15, 2025	▾
14	UBS Group AG CIK 1610520 · View history	$410.13K 31,118 shares	0.00%	+13.54K(+77.00%)Added	SEC filing ↗ May 13, 2025	▾
15	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · Amended · View history	$386.21K 29,303 shares	0.00%	+2.50K(+9.30%)Added	SEC filing ↗ Sep 15, 2025	▾
16	Nuveen, LLC CIK 1871926 · View history	$367.31K 27,869 shares	0.00%	—	SEC filing ↗ May 12, 2025	▾
17	Freestone Capital Holdings, LLC CIK 1470876 · View history	$341.64K 25,921 shares	0.01%	0(0.00%)Unchanged	SEC filing ↗ May 13, 2025	▾
18	Ikarian Capital, LLC CIK 1778253 · View history	$292.15K 22,166 shares	0.10%	-30.00K(-57.50%)Reduced	SEC filing ↗ May 15, 2025	▾
19	Delphi Financial Group, Inc. CIK 859139 · View history	$290.33K 22,028 shares	0.18%	0(0.00%)Unchanged	SEC filing ↗ May 12, 2025	▾
20	Bank of New York Mellon Corp CIK 1390777 · View history	$275.95K 20,937 shares	0.00%	+1.53K(+7.90%)Added	SEC filing ↗ Apr 29, 2025	▾

Showing 20 / 73 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

Cancelled or null records excluded

Disclosed shares

6,583,981

Not deduplicated across managers

Disclosed value

$86.71M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Cartesian Therapeutics, Inc. · Q1 2025

Explore all 73 reporting institutions.

This page includes 20 of 73 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 73 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"816212302","quarter":"2025Q1","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.