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TNDM Institutional Ownership & 13F Holders | SmartMoneyDB

TNDMTANDEM DIABETES CARE INC

COM NEW · CUSIP 875372203

Smart Money Ownership

Of the 12 tracked institutions holding TNDM, 6 have a 3-year clone track record — 5 of them beat the S&P. Average holder's clone alpha: +5.3pt. It's a gauge of who owns the name, not just how many.

TNDM (TANDEM DIABETES CARE INC) Institutional Ownership Summary

Among the 12 tracked institutional investors we monitor, TNDM (TANDEM DIABETES CARE INC) is held with a combined value of $545.39M across 27,374,249 shares. The largest holder is BlackRock, Inc. with a position worth $204.94M. 2 funds opened new positions in the most recent quarter. 7 funds increased their holdings. 3 funds reduced their position.

Total Institutional Value

$545.39M

Total Shares Held

27,374,249

Institutional Holders

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

WELLINGTON MANAGEMENT GROUP LLP+961% shares~$18.1M Point72 Asset Management, L.P.New position~$8.1M VANGUARD GROUP INC+4% shares~$6.1M MILLENNIUM MANAGEMENT LLC+31% shares~$3.4M CITADEL ADVISORS LLC+5% shares~$2.0M

13F Institutional Holders

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WELLINGTON MANAGEMENT GROUP LLP

0.00% of book+960.7%

$19.99M

MILLENNIUM MANAGEMENT LLC

Point72 Asset Management, L.P.

0.01% of bookNew

$8.06M

AQR CAPITAL MANAGEMENT LLC

0.00% of book-2.3%

$6.36M

#	Fund	Value↓	Shares	Portfolio %	Change
1	BlackRock, Inc.	$204.94M	10,690,844	0.00%	-4.1%
2	VANGUARD GROUP INC	$161.36M	7,341,356	0.00%	+3.9%
3	STATE STREET CORP	$51.04M	2,662,260	0.00%	+0.8%
4	CITADEL ADVISORS LLC	$42.03M	2,192,667	0.03%	+5.0%
5	BAILLIE GIFFORD & CO	$20.88M	1,089,393	0.02%	-4.9%
6	WELLINGTON MANAGEMENT GROUP LLP	$19.99M	1,042,764	0.00%	+960.7%
7	MILLENNIUM MANAGEMENT LLC	$14.60M	761,672	0.01%	+30.5%
8	FMR LLC	$13.69M	714,011	0.00%	+6.1%
9	Point72 Asset Management, L.P.	$8.06M	420,478	0.01%	New
10	AQR CAPITAL MANAGEMENT LLC	$6.36M	331,916	0.00%	-2.3%

Congress Trading

2 members · 5 disclosed trades in TNDM

Member	Type	Amount	Date
Gilbert Cisneros	Buy	$1,001 - $15,000	Mar 3, 2026
Josh Gottheimer	Buy	$1,001 - $15,000	Sep 22, 2025
Josh Gottheimer	Sell	$1,001 - $15,000	Mar 19, 2025
Gilbert Cisneros	Buy	$1,001 - $15,000

Frequently Asked Questions

Which institutional investors own the most TNDM stock?

As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of TNDM with a position worth $204.94M, representing 0.00% of their portfolio. In total, 12 institutional investors hold TNDM with a combined value of $545.39M.

Are hedge funds buying or selling TNDM?

In the most recent quarter, 2 funds opened a new position in TNDM. Additionally, 7 increased their holdings and 3 reduced their positions.

What percentage of TNDM is owned by institutional investors?

Institutional investors hold $545.39M worth of TNDM stock across 12 positions. The largest institutional holder is BlackRock, Inc. with $204.94M in holdings.

What is a 13F filing and why does it matter for TNDM?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For TNDM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track TNDM institutional moves

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