Millennium Management’s Tandem Diabetes Care TNDM Stock Holding History

Millennium Management’s Portfolio TNDM Stock Details TNDM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q1	–	Sell	-10,000	Closed	-$360K	–	6400
2024 Q4	$360K	Hold	10,000	–	–	﹤0.01%	4966
2024 Q3	$424K	Sell	10,000 -30,000	-75%	-$1.27M	﹤0.01%	4956
2024 Q2	$1.61M	Buy	+40,000	New	+$1.67M	﹤0.01%	3721
2023 Q4	–	Sell	-80,000	Closed	-$1.66M	–	6538
2023 Q3	$1.66M	Buy	80,000 +60,000	+300%	+$1.65M	﹤0.01%	3733
2023 Q2	$491K	Buy	+20,000	New	+$643K	﹤0.01%	4563
2021 Q4	–	Sell	-10,000	Closed	-$1.19M	–	7379
2021 Q3	$1.19M	Hold	10,000	–	–	﹤0.01%	4487
2021 Q2	$974K	Sell	10,000 -10,000	-50%	-$892K	﹤0.01%	4693
2021 Q1	$1.76M	Buy	20,000 +10,000	+100%	+$929K	﹤0.01%	3653
2020 Q4	$957K	Buy	+10,000	New	+$1.03M	﹤0.01%	3770

Other funds holding TNDM

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Sessa Capital New York $5.51B AUM 47.23% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

ACH

ArrowMark Colorado Holdings Denver, Colorado $3.76B AUM 21.77% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

GKIM

GW&K Investment Management Boston, Massachusetts $11.3B AUM 31.98% 1-Year Est. Return

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

DCM

Driehaus Capital Management Chicago, Illinois $13.6B AUM 173.98% 1-Year Est. Return

Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return

Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return

Millennium Management's TNDM Position: Q1 2026 in Review

Millennium Management increased its Tandem Diabetes Care (TNDM) stake by 31% in Q1 2026, buying an estimated $3.87M and bringing the position to 761,672 shares worth $14.6M. The position accounts for 0.01% of the portfolio, ranked #1813.

Millennium Management first reported a position in TNDM in Q4 2013 and has held it in 46 quarters since. The position peaked at $75.4M in Q2 2020. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

Millennium Management held 761,672 shares of Tandem Diabetes Care worth $14.6M as of Q1 2026.
Millennium Management bought 178,099 Tandem Diabetes Care shares in Q1 2026, an estimated $3.87M.
Tandem Diabetes Care made up 0.01% of Millennium Management's portfolio in Q1 2026, its #1813 holding.
Millennium Management first reported a position in Tandem Diabetes Care in Q4 2013 and has held it in 46 quarters since.
Millennium Management's Tandem Diabetes Care position peaked at $75.4M in Q2 2020.
272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Millennium Management's 13F filing for Q1 2026, filed 15 May 2026.