BlackRock
TNDM icon

BlackRock’s Tandem Diabetes Care TNDM Stock Holding History

BlackRock’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 		$175M Buy
11,583,125
+892,281
+8% +$15.6M ﹤0.01% 1881
2026
Q1 		$205M Sell
10,690,844
-458,337
-4% -$9.96M ﹤0.01% 1657
2025
Q4 		$245M Sell
11,149,181
-952,290
-8% -$17.2M ﹤0.01% 1548
2025
Q3 		$147M Buy
12,101,471
+1,229,913
+11% +$16.6M ﹤0.01% 1849
2025
Q2 		$203M Sell
10,871,558
-157,154
-1% -$3.11M ﹤0.01% 1619
2025
Q1 		$211M Sell
11,028,712
-669,112
-6% -$19.6M ﹤0.01% 1575
2024
Q4 		$421M Buy
11,697,824
+587,379
+5% +$19.9M 0.01% 1193
2024
Q3 		$471M Sell
11,110,445
-12,458
-0.1% -$528K 0.01% 1116
2024
Q2 		$448M Buy
11,122,903
+1,890,422
+20% +$78.9M 0.01% 1082
2024
Q1 		$327M Sell
9,232,481
-13,172
-0.1% -$353K 0.01% 1305
2023
Q4 		$273M Buy
9,245,653
+389,166
+4% +$8.07M 0.01% 1432
2023
Q3 		$184M Sell
8,856,487
-113,740
-1% -$3.12M 0.01% 1597
2023
Q2 		$220M Sell
8,970,227
-237,333
-3% -$7.64M 0.01% 1510
2023
Q1 		$374M Buy
9,207,560
+2,861,120
+45% +$118M 0.01% 1117
2022
Q4 		$285M Buy
6,346,440
+253,221
+4% +$11.5M 0.01% 1262
2022
Q3 		$292M Sell
6,093,219
-251,164
-4% -$13.8M 0.01% 1193
2022
Q2 		$376M Sell
6,344,383
-186,691
-3% -$15.3M 0.01% 1073
2022
Q1 		$759M Buy
6,531,074
+52,436
+0.8% +$6.12M 0.02% 705
2021
Q4 		$975M Buy
6,478,638
+672,004
+12% +$90.7M 0.02% 618
2021
Q3 		$693M Buy
5,806,634
+2,283,672
+65% +$252M 0.02% 756
2021
Q2 		$343M Buy
3,522,962
+33,741
+1% +$3.01M 0.01% 1352
2021
Q1 		$308M Buy
3,489,221
+9,731
+0.3% +$904K 0.01% 1397
2020
Q4 		$333M Buy
3,479,490
+54,376
+2% +$5.6M 0.01% 1214
2020
Q3 		$389M Buy
3,425,114
+36,355
+1% +$3.82M 0.01% 896
2020
Q2 		$335M Sell
3,388,759
-1,015,554
-23% -$81M 0.01% 977
2020
Q1 		$283M Buy
4,404,313
+125,008
+3% +$8.76M 0.01% 915
2019
Q4 		$255M Buy
4,279,305
+24,529
+0.6% +$1.51M 0.01% 1298
2019
Q3 		$251M Buy
4,254,776
+199,865
+5% +$12.8M 0.01% 1237
2019
Q2 		$262M Buy
4,054,911
+83,336
+2% +$5.38M 0.01% 1225
2019
Q1 		$252M Sell
3,971,575
-230,120
-5% -$12.1M 0.01% 1236
2018
Q4 		$160M Buy
4,201,695
+292,389
+7% +$10.3M 0.01% 1487
2018
Q3 		$167M Buy
3,909,306
+973,769
+33% +$34M 0.01% 1606
2018
Q2 		$64.6M Buy
2,935,537
+2,893,817
+6,936% +$35.6M ﹤0.01% 2216
2018
Q1 		$207K Sell
41,720
-242
-0.6% -$780 ﹤0.01% 4206
2017
Q4 		$99K Buy
41,962
+22
+0.1% +$69 ﹤0.01% 4334
2017
Q3 		$307K Buy
41,940
+24,359
+139% +$154K ﹤0.01% 4145
2017
Q2 		$141K Sell
17,581
-84,503
-83% -$781K ﹤0.01% 4339
2017
Q1 		$1.23M Buy
102,084
+101,993
+112,080% +$2.23M ﹤0.01% 3774
2016
Q4 		$2K Sell
91
-36
-28% -$1.39K ﹤0.01% 3649
2016
Q3 		$10K Hold
127
– – ﹤0.01% 3402
2016
Q2 		$10K Buy
127
+54
+74% +$4.35K ﹤0.01% 3411
2016
Q1 		$6K Buy
+73
New +$6.39K ﹤0.01% 3333

Other funds holding TNDM

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
FGP
Freestone Grove Partners San Francisco, California $15.6B AUM 27.39% 1-Year Est. Return

BlackRock's TNDM Position: Q2 2026 in Review

BlackRock increased its Tandem Diabetes Care (TNDM) stake by 8.3% in Q2 2026, buying an estimated $15.6M and bringing the position to 11,583,125 shares worth $175M. The position accounts for ﹤0.01% of the portfolio, ranked #1881.

BlackRock first reported a position in TNDM in Q1 2016 and has held it in 42 quarters since. The position peaked at $975M in Q4 2021. 273 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • BlackRock held 11,583,125 shares of Tandem Diabetes Care worth $175M as of Q2 2026.
  • BlackRock bought 892,281 Tandem Diabetes Care shares in Q2 2026, an estimated $15.6M.
  • Tandem Diabetes Care made up ﹤0.01% of BlackRock's portfolio in Q2 2026, its #1881 holding.
  • BlackRock first reported a position in Tandem Diabetes Care in Q1 2016 and has held it in 42 quarters since.
  • BlackRock's Tandem Diabetes Care position peaked at $975M in Q4 2021.
  • 273 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on BlackRock's 13F filing for Q2 2026, filed 7 Aug 2026.