Tandem Diabetes Care Inc (TNDM) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

66,677,377Shares Outstanding

5,845,547Shares held by institutions

$110,130,105Value of institutional holdings

115.62%Institutional ownership %

11.44%Shares Changed QoQ

252No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

The institutional landscape for Tandem Diabetes Care Inc (NASDAQ:TNDM) includes 252 filers as of the latest reporting cycle ending December 2025.

The percentage of Tandem Diabetes Care owned by institutions changed from 112.5% in September 2025 to 115.6% in December 2025, marking a slight up trend.
On a quarter-over-quarter basis, institutional holdings shifted by 11.44%, with a year-over-year a decrease of 19.49% in the count of filers.
Among the 252 institutional holders of Tandem Diabetes Care, 130 added to their stakes while 91 trimmed their positions and 31 held steady.
The total number of shares held by institutions in Tandem Diabetes Care increased to 77.10Mn as of December 2025, a net change of up by 7.92Mn shares quarter on quarter, and up 4.87Mn shares year over year.
BlackRock, Inc. continues to be the largest institutional holder of Tandem Diabetes Care as of December 31, 2025, with a position of 11.15Mn shares, representing 16.72% of the company's outstanding stock.
Among the most significant buyers of Tandem Diabetes Care during December 2025 were CITADEL ADVISORS LLC (2.05Mn), UBS Group AG (1.66Mn), DRIEHAUS CAPITAL MANAGEMENT LLC (1.61Mn), MORGAN STANLEY (1.34Mn), Assenagon Asset Management S.A. (1.23Mn).
Leading sellers of Tandem Diabetes Care stock in December 2025 included BlackRock, Inc. (952.29K), ArrowMark Colorado Holdings LLC (801.51K), ACADIAN ASSET MANAGEMENT LLC (525.96K), ROYAL BANK OF CANADA (472.55K), Freestone Grove Partners LP (427.47K).
The top 10 institutional holders of Tandem Diabetes Care for the quarter ending December 2025 included BlackRock, Inc. (11.15Mn), VANGUARD GROUP INC (7.34Mn), Sessa Capital IM, L.P. (5.00Mn), UBS Group AG (3.16Mn), ArrowMark Colorado Holdings LLC (2.89Mn), GW&K Investment Management, LLC (2.68Mn), STATE STREET CORP (2.64Mn), CITADEL ADVISORS LLC (2.09Mn), MORGAN STANLEY (2.08Mn), Paradice Investment Management LLC (2.08Mn).

252 Institutional Holders

5,845,547 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
BlackRock, Inc.	31 Dec, 2025	11,149,181	-952,290	-7.87%	$245,058,999.00
VANGUARD GROUP INC	31 Dec, 2025	7,341,356	278,042	3.94%	$161,363,004.00
Sessa Capital IM, L.P.	31 Dec, 2025	5,000,000	0	0.00%	$109,900,000.00
UBS Group AG	31 Dec, 2025	3,163,145	1,658,768	110.26%	$69,525,928.00
ArrowMark Colorado Holdings LLC	31 Dec, 2025	2,889,691	-801,507	-21.71%	$63,515,408.00
GW&K Investment Management, LLC	31 Dec, 2025	2,675,157	-46,492	-1.71%	$58,800.00
STATE STREET CORP	31 Dec, 2025	2,641,724	-26,464	-0.99%	$58,065,094.00
CITADEL ADVISORS LLC	31 Dec, 2025	2,088,603	2,048,802	5,147.61%	$45,907,494.00
MORGAN STANLEY	31 Dec, 2025	2,080,497	1,342,950	182.08%	$45,729,350.00
Paradice Investment Management LLC	31 Dec, 2025	2,077,745	-118,723	-5.41%	$45,668,835.00
JENNISON ASSOCIATES LLC	31 Dec, 2025	2,021,376	601,260	42.34%	$44,429,844.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	1,683,400	252,028	17.61%	$37,001,133.00
JACOBS LEVY EQUITY MANAGEMENT, INC	31 Dec, 2025	1,653,708	171,755	11.59%	$36,348,502.00
GEODE CAPITAL MANAGEMENT, LLC	31 Dec, 2025	1,649,383	51,102	3.20%	$36,259,526.00
DRIEHAUS CAPITAL MANAGEMENT LLC	31 Dec, 2025	1,610,342	1,610,342	0.00%	$35,395,317.00
Freestone Grove Partners LP	31 Dec, 2025	1,442,836	-427,471	-22.86%	$31,713,535.00
BNP PARIBAS FINANCIAL MARKETS	31 Dec, 2025	1,248,481	1,028,866	468.49%	$27,441,612.00
Assenagon Asset Management S.A.	31 Dec, 2025	1,227,856	1,227,856	0.00%	$26,988,275.00
TWO SIGMA INVESTMENTS, LP	31 Dec, 2025	1,201,527	84,325	7.55%	$26,409,563.00
BAILLIE GIFFORD & CO	31 Dec, 2025	1,145,516	24,921	2.22%	$25,178,442.00

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