American Century Companies
TNDM icon

American Century Companies’s Tandem Diabetes Care TNDM Stock Holding History

American Century Companies’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 		$642K Buy
33,470
+710
+2% +$15.4K ﹤0.01% 2458
2025
Q4 		$720K Buy
32,760
+11
+0% +$199 ﹤0.01% 2415
2025
Q3 		$398K Buy
+32,749
New +$443K ﹤0.01% 2569
2023
Q2 		– Sell
-12,391
Closed -$503K – 2842
2023
Q1 		$503K Buy
12,391
+732
+6% +$30.3K ﹤0.01% 2126
2022
Q4 		$524K Buy
+11,659
New +$528K ﹤0.01% 2035
2022
Q3 		– Sell
-428,340
Closed -$25.4M – 2473
2022
Q2 		$25.4M Buy
428,340
+95,841
+29% +$7.87M 0.02% 598
2022
Q1 		$38.7M Buy
332,499
+68,811
+26% +$8.03M 0.03% 512
2021
Q4 		$39.7M Buy
263,688
+47,473
+22% +$6.41M 0.03% 529
2021
Q3 		$25.8M Sell
216,215
-137,830
-39% -$15.2M 0.02% 625
2021
Q2 		$34.5M Sell
354,045
-67,710
-16% -$6.04M 0.02% 542
2021
Q1 		$37.2M Sell
421,755
-259,495
-38% -$24.1M 0.03% 500
2020
Q4 		$65.2M Buy
681,250
+19,034
+3% +$1.96M 0.05% 345
2020
Q3 		$75.2M Sell
662,216
-31,284
-5% -$3.29M 0.07% 288
2020
Q2 		$68.6M Sell
693,500
-54,112
-7% -$4.32M 0.07% 281
2020
Q1 		$48.1M Buy
747,612
+239,901
+47% +$16.8M 0.06% 307
2019
Q4 		$30.3M Buy
507,711
+45,972
+10% +$2.84M 0.03% 438
2019
Q3 		$27.2M Buy
+461,739
New +$29.5M 0.03% 436
2016
Q3 		– Sell
-24,622
Closed -$1.86M – 1410
2016
Q2 		$1.86M Buy
24,622
+248
+1% +$20K ﹤0.01% 1042
2016
Q1 		$2.12M Buy
+24,374
New +$2.13M ﹤0.01% 986

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
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

American Century Companies's TNDM Position: Q1 2026 in Review

American Century Companies increased its Tandem Diabetes Care (TNDM) stake by 2.2% in Q1 2026, buying an estimated $15.4K and bringing the position to 33,470 shares worth $642K. The position accounts for ﹤0.01% of the portfolio, ranked #2458.

American Century Companies first reported a position in TNDM in Q1 2016 and has held it in 19 quarters since. The position peaked at $75.2M in Q3 2020. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • American Century Companies held 33,470 shares of Tandem Diabetes Care worth $642K as of Q1 2026.
  • American Century Companies bought 710 Tandem Diabetes Care shares in Q1 2026, an estimated $15.4K.
  • Tandem Diabetes Care made up ﹤0.01% of American Century Companies's portfolio in Q1 2026, its #2458 holding.
  • American Century Companies first reported a position in Tandem Diabetes Care in Q1 2016 and has held it in 19 quarters since.
  • American Century Companies's Tandem Diabetes Care position peaked at $75.2M in Q3 2020.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on American Century Companies's 13F filing for Q1 2026, filed 15 May 2026.