TANDEM DIABETES CARE INC

TNDMNASDAQ

$16.52+0.02 (+0.12%)as of Oct 5, 2026

Legend

Insider buy

Insider sell

Congress buy

Congress sell

Hedge Funds
bought vs soldGreener markers show more buyers; redder markers show more sellers.

Company share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size.

Insider buy
Insider sell
Congress buy
Congress sell
Hedge Funds bought vs sold

Share activityNet buybacksNo changeNet dilution

Marker size reflects transaction size. Greener fund markers mean more buyers.

Insider Buy
Insider Sell
Congress Buy
Congress Sell
Hedge funds bought vs sold
BuybackNo changeNet dilution

TANDEM DIABETES CARE INC price and activity chart data

Showing the 1Y range: Oct 6, 2025 to Oct 5, 2026. Price (+10.1%). 0 insider or congressional trades plotted in this window as 0 markers; nearby trades of the same kind are grouped.

Transactions plotted on the price chart
Date	Category	Person	Role	Action	Amount	Change in holding

Largest institutional holders

13F · Q2 2026

Fund	% of company held	Value	% of portfolio	Quarterly activity
BlackRock, Inc.	16.66%	$175M	0.00%	Not reported
Sessa Capital IM, L.P.	7.33%	$77M	1.29%	Not reported
Vanguard Portfolio Management LLC	6.18%	$64.9M	0.00%	Not reported
First Light Asset Management, LLC	4.87%	$51.1M	3.10%	Add 157.36%
Vanguard Capital Management LLC	4.45%	$46.7M	0.00%	Not reported
State Street Corp	4.10%	$43M	0.00%	Not reported
GW&K Investment Management, LLC	3.69%	$38.8M	0.30%	Not reported
Jennison Associates LLC	3.35%	$35.2M	0.02%	Add 40.58%
Paradice Investment Management LLC	2.91%	$30.5M	4.87%	Reduce 0.90%
Jacobs Levy Equity Management, Inc	2.89%	$30.3M	0.11%	Not reported
Freestone Grove Partners LP	2.68%	$28.2M	0.18%	Add 40.23%
Geode Capital Management, LLC	2.59%	$27.2M	0.00%	Not reported
Driehaus Capital Management LLC	2.57%	$27M	0.16%	Reduce 22.45%
Citadel Advisors LLC	2.50%	$26.2M	0.00%	Not reported
Millennium Management LLC	1.89%	$19.8M	0.01%	Not reported
Woodline Partners LP	1.88%	$19.7M	0.06%	Not reported
ArrowMark Colorado Holdings LLC	1.87%	$19.6M	0.82%	Reduce 58.13%
UBS Group AG	1.65%	$17.3M	0.00%	Not reported
FMR LLC	1.40%	$14.7M	0.00%	Not reported
Royce & Associates LP	1.30%	$13.6M	0.11%	Not reported
Wellington Management Group LLP	1.25%	$13.2M	0.00%	Reduce 16.39%
Goldman Sachs Group Inc	1.24%	$13M	0.00%	Not reported
Northern Trust Corp	1.08%	$11.4M	0.00%	Not reported
Verition Fund Management LLC	1.01%	$10.6M	0.05%	Not reported
ExodusPoint Capital Management, LP	0.99%	$10.4M	0.07%	Not reported
Qube Research & Technologies Ltd	0.98%	$10.3M	0.01%	Not reported
D. E. Shaw & Co., Inc.	0.98%	$10.3M	0.00%	Not reported
Arrowstreet Capital, Limited Partnership	0.96%	$10.1M	0.00%	Not reported
Charles Schwab Investment Management Inc	0.94%	$9.91M	0.00%	Not reported
Morgan Stanley	0.93%	$9.76M	0.00%	Not reported
Point72 Asset Management, L.P.	0.88%	$9.22M	0.01%	Not reported
Soleus Capital Management, L.P.	0.83%	$8.68M	0.30%	Not reported
Bank of Montreal	0.81%	$8.53M	0.00%	Not reported
Two Sigma Investments, LP	0.80%	$8.43M	0.01%	Not reported
AQR Capital Management LLC	0.77%	$8.06M	0.00%	Not reported
Vanguard Fiduciary Trust Co	0.71%	$7.41M	0.00%	Not reported
Aberdeen Group plc	0.64%	$6.67M	0.01%	Add 1.78%
Jump Financial, LLC	0.58%	$6.1M	0.05%	Not reported
Bank of America Corp	0.57%	$5.96M	0.00%	Not reported
Frontier Capital Management Co LLC	0.55%	$5.74M	0.05%	Reduce 4.22%
Tudor Investment Corp Et Al	0.52%	$5.47M	0.01%	Not reported
DAFNA Capital Management LLC	0.51%	$5.36M	1.02%	Not reported
Bank of New York Mellon Corp	0.51%	$5.31M	0.00%	Not reported
Barclays PLC	0.50%	$5.29M	0.00%	Not reported
JPMorgan Chase & Co	0.50%	$5.53M	0.00%	Not reported
Principal Financial Group Inc	0.48%	$5.06M	0.00%	Not reported
Invesco Ltd.	0.46%	$4.85M	0.00%	Not reported
Y-Intercept (Hong Kong) Ltd	0.45%	$4.75M	0.09%	Not reported
Alberta Investment Management Corp	0.45%	$4.73M	0.03%	Not reported
Edmond de Rothschild Holding S.A.	0.44%	$4.65M	0.06%	Add 19.36%

50 of 260 holders

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