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TNDM Institutional Ownership & 13F Holders | SmartMoneyDB

TNDMTANDEM DIABETES CARE INC

COM NEW · CUSIP 875372203

Yahoo Finance

Smart Money Score

Composite context from Form 4, 13F and congressional disclosures; not a forecast.

4/10

Insider 0 · 13F 4

Congress 1 · 2+ sources

Smart Money Ownership

Of the 11 tracked institutions holding TNDM, 4 have a 3-year clone track record — 4 of them beat the S&P. Average holder's clone alpha: +6.0pt. It's a gauge of who owns the name, not just how many.

PRICE T ROWE ASSOCIATES INC /MD/

$1.3M

+3.5pt

TNDM (TANDEM DIABETES CARE INC) Institutional Ownership Summary

Among the 11 tracked institutional investors we monitor, TNDM (TANDEM DIABETES CARE INC) is held with a combined value of $492.29M across 28,843,027 shares. The largest holder is BlackRock, Inc. with a position worth $174.79M. 8 funds increased their holdings. 3 funds reduced their position.

Total Institutional Value

$492.29M

Total Shares Held

28,843,027

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

BlackRock, Inc.+8% shares~$13.4M MILLENNIUM MANAGEMENT LLC+72% shares~$8.3M VANGUARD GROUP INC+4% shares~$6.1M FMR LLC+37% shares~$4.0M AQR CAPITAL MANAGEMENT LLC+61% shares~$3.0M

13F Institutional Holders

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TWO SIGMA ADVISERS, LP

0.04% of book-3.4%

$20.62M

MILLENNIUM MANAGEMENT LLC

WELLINGTON MANAGEMENT GROUP LLP

0.00% of book-16.4%

$13.16M

Point72 Asset Management, L.P.

0.01% of book+45.3%

$9.22M

AQR CAPITAL MANAGEMENT LLC

0.00% of book+60.8%

$8.06M

#	Fund	Value↓	Shares	Portfolio %	Change
1	BlackRock, Inc.	$174.79M	11,583,125	0.00%	+8.3%
2	VANGUARD GROUP INC	$161.36M	7,341,356	0.00%	+3.9%
3	STATE STREET CORP	$43.03M	2,851,646	0.00%	+7.1%
4	CITADEL ADVISORS LLC	$26.19M	1,735,879	0.02%	-20.8%
5	TWO SIGMA ADVISERS, LP	$20.62M	937,983	0.04%	-3.4%
6	MILLENNIUM MANAGEMENT LLC	$19.79M	1,311,739	0.01%	+72.2%
7	FMR LLC	$14.73M	976,432	0.00%	+36.8%
8	WELLINGTON MANAGEMENT GROUP LLP	$13.16M	871,811	0.00%	-16.4%
9	Point72 Asset Management, L.P.	$9.22M	610,903	0.01%	+45.3%
10	AQR CAPITAL MANAGEMENT LLC	$8.06M	533,837	0.00%	+60.8%

Activist & Large Holders (13D/13G)

Investor	Ownership	Type	Filed
Voya Financial, Inc.	0.2%	13G/A	2026-08-06

SEC Schedule 13D (activist) and 13G (passive) filings for TNDM. Filed when an investor acquires 5%+ ownership.

Congress Trading

2 members · 6 disclosed trades in TNDM

Member	Type	Amount	Date
Gilbert Cisneros	Buy	$1,001 - $15,000	Sep 29, 2026
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

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 $174.79M, representing 0.00% of their portfolio. In total, 11 institutional investors hold TNDM with a combined value of $492.29M.

What percentage of TNDM is owned by institutional investors?

Institutional investors hold $492.29M worth of TNDM stock across 11 positions. The largest institutional holder is BlackRock, Inc. with $174.79M 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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