Citigroup’s Tandem Diabetes Care TNDM Stock Holding History

Citigroup’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
2021 Q1	–	Sell	-39,300	Closed	-$3.76M	–	7357
2020 Q4	$3.76M	Buy	39,300 +1,700	+5%	+$175K	﹤0.01%	2296
2020 Q3	$4.27M	Sell	37,600 -25,700	-41%	-$2.7M	﹤0.01%	1998
2020 Q2	$6.26M	Buy	63,300 +14,500	+30%	+$1.16M	﹤0.01%	1667
2020 Q1	$3.14M	Buy	48,800 +7,400	+18%	+$518K	﹤0.01%	2067
2019 Q4	$2.47M	Buy	41,400 +3,200	+8%	+$197K	﹤0.01%	2768
2019 Q3	$2.25M	Buy	38,200 +16,500	+76%	+$1.05M	﹤0.01%	2730
2019 Q2	$1.4M	Buy	21,700 +8,100	+60%	+$523K	﹤0.01%	3235
2019 Q1	$864K	Sell	13,600 -1,300	-9%	-$68.3K	﹤0.01%	3562
2018 Q4	$566K	Buy	14,900 +11,900	+397%	+$420K	﹤0.01%	3995
2018 Q3	$129K	Buy	+3,000	New	+$105K	﹤0.01%	5665

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

Citigroup's TNDM Position: Q1 2026 in Review

Citigroup increased its Tandem Diabetes Care (TNDM) stake by 272% in Q1 2026, buying an estimated $1.09M and bringing the position to 68,346 shares worth $1.31M. The position accounts for ﹤0.01% of the portfolio, ranked #2941.

Citigroup first reported a position in TNDM in Q4 2013 and has held it in 49 quarters since. The position peaked at $10.3M in Q1 2021. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

Citigroup held 68,346 shares of Tandem Diabetes Care worth $1.31M as of Q1 2026.
Citigroup bought 49,978 Tandem Diabetes Care shares in Q1 2026, an estimated $1.09M.
Tandem Diabetes Care made up ﹤0.01% of Citigroup's portfolio in Q1 2026, its #2941 holding.
Citigroup first reported a position in Tandem Diabetes Care in Q4 2013 and has held it in 49 quarters since.
Citigroup's Tandem Diabetes Care position peaked at $10.3M in Q1 2021.
272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Citigroup's 13F filing for Q1 2026, filed 11 May 2026.