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ArrowMark Colorado Holdings’s Tandem Diabetes Care TNDM Stock Holding History

ArrowMark Colorado Holdings’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
2026
Q1 		$59.5M Buy
3,103,609
+213,918
+7% +$4.65M 1.58% 11
2025
Q4 		$63.5M Sell
2,889,691
-801,507
-22% -$14.5M 1.4% 8
2025
Q3 		$44.8M Buy
3,691,198
+991,649
+37% +$13.4M 0.83% 40
2025
Q2 		$50.3M Sell
2,699,549
-16,783
-0.6% -$332K 0.91% 35
2025
Q1 		$52M Sell
2,716,332
-7,383
-0.3% -$216K 0.84% 44
2024
Q4 		$98.1M Buy
2,723,715
+337,026
+14% +$11.4M 1.32% 23
2024
Q3 		$101M Sell
2,386,689
-118,162
-5% -$5.01M 1.3% 22
2024
Q2 		$101M Sell
2,504,851
-429,328
-15% -$17.9M 1.2% 22
2024
Q1 		$104M Sell
2,934,179
-824
-0% -$22.1K 1.17% 23
2023
Q4 		$86.8M Buy
2,935,003
+1,303,459
+80% +$27M 0.96% 33
2023
Q3 		$33.9M Buy
+1,631,544
New +$44.8M 0.41% 71

Other funds holding TNDM

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
SC
Sessa Capital New York $5.51B AUM 47.23% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
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
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
Goldman Sachs New York $871B AUM 31.28% 1-Year Est. Return
Citadel Advisors
Citadel Advisors Miami, Florida $618B AUM 30.34% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return

ArrowMark Colorado Holdings's TNDM Position: Q1 2026 in Review

ArrowMark Colorado Holdings increased its Tandem Diabetes Care (TNDM) stake by 7.4% in Q1 2026, buying an estimated $4.65M and bringing the position to 3,103,609 shares worth $59.5M. The position accounts for 1.58% of the portfolio, ranked #11.

ArrowMark Colorado Holdings first reported a position in TNDM in Q3 2023 and has held it in 11 quarters since. The position peaked at $104M in Q1 2024. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • ArrowMark Colorado Holdings held 3,103,609 shares of Tandem Diabetes Care worth $59.5M as of Q1 2026.
  • ArrowMark Colorado Holdings bought 213,918 Tandem Diabetes Care shares in Q1 2026, an estimated $4.65M.
  • Tandem Diabetes Care made up 1.58% of ArrowMark Colorado Holdings's portfolio in Q1 2026, its #11 holding.
  • ArrowMark Colorado Holdings first reported a position in Tandem Diabetes Care in Q3 2023 and has held it in 11 quarters since.
  • ArrowMark Colorado Holdings's Tandem Diabetes Care position peaked at $104M in Q1 2024.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on ArrowMark Colorado Holdings's 13F filing for Q1 2026, filed 15 May 2026.