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Driehaus Capital Management’s Tandem Diabetes Care TNDM Stock Holding History

Driehaus Capital 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
2026
Q1 		$44.2M Buy
2,304,414
+694,072
+43% +$15.1M 0.32% 109
2025
Q4 		$35.4M Buy
+1,610,342
New +$29.1M 0.24% 136
2024
Q4 		– Sell
-777,590
Closed -$33M – 453
2024
Q3 		$33M Sell
777,590
-177,654
-19% -$7.53M 0.28% 112
2024
Q2 		$38.5M Sell
955,244
-362,193
-27% -$15.1M 0.37% 85
2024
Q1 		$46.7M Buy
+1,317,437
New +$35.3M 0.46% 57
2022
Q1 		– Sell
-42,164
Closed -$6.35M – 448
2021
Q4 		$6.35M Buy
+42,164
New +$5.69M 0.06% 283
2021
Q1 		– Sell
-8,950
Closed -$856K – 519
2020
Q4 		$856K Sell
8,950
-351,720
-98% -$36.2M 0.01% 333
2020
Q3 		$40.9M Sell
360,670
-935
-0.3% -$98.2K 0.84% 21
2020
Q2 		$35.8M Buy
361,605
+19,824
+6% +$1.58M 0.87% 18
2020
Q1 		$22M Buy
341,781
+150,896
+79% +$10.6M 0.73% 30
2019
Q4 		$11.4M Sell
190,885
-157,573
-45% -$9.72M 0.3% 94
2019
Q3 		$20.6M Sell
348,458
-116,601
-25% -$7.44M 0.67% 33
2019
Q2 		$30M Sell
465,059
-18,660
-4% -$1.2M 0.94% 17
2019
Q1 		$30.7M Buy
483,719
+133,653
+38% +$7.02M 1.15% 14
2018
Q4 		$13.3M Buy
350,066
+138,206
+65% +$4.88M 0.57% 43
2018
Q3 		$9.08M Buy
211,860
+166,860
+371% +$5.83M 0.28% 115
2018
Q2 		$991K Buy
+45,000
New +$553K 0.03% 345
2016
Q1 		– Sell
-7,470
Closed -$882K – 638
2015
Q4 		$882K Buy
+7,470
New +$741K 0.03% 391
2014
Q2 		– Sell
-4,530
Closed -$1M – 623
2014
Q1 		$1M Buy
+4,530
New +$1.16M 0.03% 396

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
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
State Street Boston, Massachusetts $2.9T AUM 29.55% 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

Driehaus Capital Management's TNDM Position: Q1 2026 in Review

Driehaus Capital Management increased its Tandem Diabetes Care (TNDM) stake by 43% in Q1 2026, buying an estimated $15.1M and bringing the position to 2,304,414 shares worth $44.2M. The position accounts for 0.32% of the portfolio, ranked #109.

Driehaus Capital Management first reported a position in TNDM in Q1 2014 and has held it in 19 quarters since. The position peaked at $46.7M in Q1 2024. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Driehaus Capital Management held 2,304,414 shares of Tandem Diabetes Care worth $44.2M as of Q1 2026.
  • Driehaus Capital Management bought 694,072 Tandem Diabetes Care shares in Q1 2026, an estimated $15.1M.
  • Tandem Diabetes Care made up 0.32% of Driehaus Capital Management's portfolio in Q1 2026, its #109 holding.
  • Driehaus Capital Management first reported a position in Tandem Diabetes Care in Q1 2014 and has held it in 19 quarters since.
  • Driehaus Capital Management's Tandem Diabetes Care position peaked at $46.7M in Q1 2024.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

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