Acadian Asset Management
TNDM icon

Acadian Asset Management’s Tandem Diabetes Care TNDM Stock Holding History

Acadian Asset 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
Q2 		$2.06M Sell
137,237
-140,879
-51% -$2.46M ﹤0.01% 1069
2026
Q1 		$5.32M Sell
278,116
-114,647
-29% -$2.49M 0.01% 696
2025
Q4 		$8.63M Sell
392,763
-525,960
-57% -$9.49M 0.01% 510
2025
Q3 		$11.1M Buy
918,723
+560,207
+156% +$7.58M 0.02% 454
2025
Q2 		$6.68M Buy
358,516
+125,644
+54% +$2.49M 0.01% 513
2025
Q1 		$4.46M Buy
+232,872
New +$6.81M 0.01% 531
2024
Q4 		– Sell
-958
Closed -$40K – 2161
2024
Q3 		$40K Buy
+958
New +$40.6K ﹤0.01% 1864
2024
Q1 		– Sell
-3,759
Closed -$111K – 1785
2023
Q4 		$111K Buy
+3,759
New +$78K ﹤0.01% 1338
2023
Q3 		– Sell
-669
Closed -$16K – 1844
2023
Q2 		$16K Hold
669
– – ﹤0.01% 1660
2023
Q1 		$27K Sell
669
-2,816
-81% -$117K ﹤0.01% 1611
2022
Q4 		$155K Buy
+3,485
New +$158K ﹤0.01% 1345
2022
Q3 		– Sell
-373
Closed -$22K – 1849
2022
Q2 		$22K Buy
+373
New +$30.6K ﹤0.01% 1610
2021
Q4 		– Sell
-5,041
Closed -$599K – 1852
2021
Q3 		$599K Buy
5,041
+4,669
+1,255% +$514K ﹤0.01% 994
2021
Q2 		$36K Buy
+372
New +$33.2K ﹤0.01% 1851
2019
Q4 		– Sell
-161
Closed -$9K – 2055
2019
Q3 		$9K Buy
+161
New +$10.3K ﹤0.01% 1777
2019
Q1 		– Sell
-69
Closed -$3K – 2045
2018
Q4 		$3K Buy
+69
New +$2.44K ﹤0.01% 1688

Other funds holding TNDM

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
SC
Sessa Capital New York $5.98B AUM 99.85% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
FLAM
First Light Asset Management Edina, Minnesota $1.65B AUM 203.21% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
GKIM
GW&K Investment Management Boston, Massachusetts $12.8B AUM 48.82% 1-Year Est. Return
Jennison Associates
Jennison Associates New York $167B AUM 44.17% 1-Year Est. Return
PIM
Paradice Investment Management Denver, Colorado $627M AUM 43.41% 1-Year Est. Return
Jacobs Levy Equity Management
Jacobs Levy Equity Management Florham Park, New Jersey $27.8B AUM 46.46% 1-Year Est. Return

Acadian Asset Management's TNDM Position: Q2 2026 in Review

Acadian Asset Management reduced its Tandem Diabetes Care (TNDM) stake by 51% in Q2 2026, selling an estimated $2.46M and leaving 137,237 shares worth $2.06M. The position accounts for ﹤0.01% of the portfolio, ranked #1069.

Acadian Asset Management first reported a position in TNDM in Q4 2018 and has held it in 16 quarters since. The position peaked at $11.1M in Q3 2025. 273 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • Acadian Asset Management held 137,237 shares of Tandem Diabetes Care worth $2.06M as of Q2 2026.
  • Acadian Asset Management sold 140,879 Tandem Diabetes Care shares in Q2 2026, an estimated $2.46M.
  • Tandem Diabetes Care made up ﹤0.01% of Acadian Asset Management's portfolio in Q2 2026, its #1069 holding.
  • Acadian Asset Management first reported a position in Tandem Diabetes Care in Q4 2018 and has held it in 16 quarters since.
  • Acadian Asset Management's Tandem Diabetes Care position peaked at $11.1M in Q3 2025.
  • 273 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Acadian Asset Management's 13F filing for Q2 2026, filed 13 Aug 2026.