Wellington Management Group
TNDM icon

Wellington Management Group’s Tandem Diabetes Care TNDM Stock Holding History

Wellington Management Group’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 		$13.2M Sell
871,811
-170,953
-16% -$2.99M ﹤0.01% 1217
2026
Q1 		$20M Buy
1,042,764
+944,455
+961% +$20.5M ﹤0.01% 1013
2025
Q4 		$2.16M Buy
+98,309
New +$1.77M ﹤0.01% 1582
2022
Q4 		– Sell
-328,866
Closed -$15.7M – 2120
2022
Q3 		$15.7M Sell
328,866
-354,573
-52% -$19.4M ﹤0.01% 983
2022
Q2 		$40.5M Sell
683,439
-17,076
-2% -$1.4M 0.01% 736
2022
Q1 		$81.5M Sell
700,515
-8,100
-1% -$946K 0.01% 626
2021
Q4 		$107M Buy
708,615
+249,976
+55% +$33.7M 0.02% 610
2021
Q3 		$54.8M Sell
458,639
-102,438
-18% -$11.3M 0.01% 788
2021
Q2 		$54.6M Buy
561,077
+13,138
+2% +$1.17M 0.01% 795
2021
Q1 		$48.4M Sell
547,939
-1,716,495
-76% -$160M 0.01% 805
2020
Q4 		$217M Sell
2,264,434
-1,365,111
-38% -$141M 0.04% 395
2020
Q3 		$412M Sell
3,629,545
-2,608,293
-42% -$274M 0.09% 216
2020
Q2 		$617M Sell
6,237,838
-550,184
-8% -$43.9M 0.14% 148
2020
Q1 		$437M Buy
6,788,022
+3,742,625
+123% +$262M 0.12% 167
2019
Q4 		$182M Buy
3,045,397
+971,210
+47% +$59.9M 0.04% 422
2019
Q3 		$122M Buy
2,074,187
+194,257
+10% +$12.4M 0.03% 496
2019
Q2 		$121M Buy
1,879,930
+443,631
+31% +$28.6M 0.03% 509
2019
Q1 		$91.2M Buy
+1,436,299
New +$75.4M 0.02% 567

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

Wellington Management Group's TNDM Position: Q2 2026 in Review

Wellington Management Group reduced its Tandem Diabetes Care (TNDM) stake by 16% in Q2 2026, selling an estimated $2.99M and leaving 871,811 shares worth $13.2M. The position accounts for ﹤0.01% of the portfolio, ranked #1217.

Wellington Management Group first reported a position in TNDM in Q1 2019 and has held it in 18 quarters since. The position peaked at $617M in Q2 2020. 273 funds tracked by Wall St. Rank hold TNDM as of Q2 2026.

  • Wellington Management Group held 871,811 shares of Tandem Diabetes Care worth $13.2M as of Q2 2026.
  • Wellington Management Group sold 170,953 Tandem Diabetes Care shares in Q2 2026, an estimated $2.99M.
  • Tandem Diabetes Care made up ﹤0.01% of Wellington Management Group's portfolio in Q2 2026, its #1217 holding.
  • Wellington Management Group first reported a position in Tandem Diabetes Care in Q1 2019 and has held it in 18 quarters since.
  • Wellington Management Group's Tandem Diabetes Care position peaked at $617M in Q2 2020.
  • 273 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q2 2026.

Based on Wellington Management Group's 13F filing for Q2 2026, filed 14 Aug 2026.