Tandem Diabetes Care Ownership & Insider Activity

Tandem Diabetes Care (TNDM) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 1.0% of shares outstanding. Institutional investors hold 56.3%.

Shares Outstanding

69.579M

Shares Float

51.954M

Insider Shares Owned

689.347K

Insider % Owned

1.0%

Institutional Shares Held

39.191M

Institutional % Held

56.3%

Ownership Breakdown

Net Insider Activity by Month

Tandem Diabetes Care Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Oct 27, 2026	Christopher J Twomey	DIRECTOR	SELL-OPTIONS	—	$19.07	$255

Date	Member	Party	Chamber	Action	Amount
Sep 29, 2026	Gilbert Ray Cisneros	D	House	Purchase	$1,001 - $15,000
Mar 3, 2026	Gilbert Ray Cisneros	D	House	Purchase	$1,001 - $15,000
Sep 22, 2025	Josh Gottheimer	D	House	Purchase	$1,001 - $15,000
Mar 19, 2025	Josh Gottheimer	D	House	Sale	$1,001 - $15,000
Mar 4, 2025	Gilbert Ray Cisneros	D	House	Purchase	$1,001 - $15,000
Aug 5, 2024	Josh Gottheimer	D	House	Purchase	$1,001 - $15,000