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
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 $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

Wellington Management Group's TNDM Position: Q1 2026 in Review

Wellington Management Group increased its Tandem Diabetes Care (TNDM) stake by 961% in Q1 2026, buying an estimated $20.5M and bringing the position to 1,042,764 shares worth $20M. The position accounts for ﹤0.01% of the portfolio, ranked #1013.

Wellington Management Group first reported a position in TNDM in Q1 2019 and has held it in 17 quarters since. The position peaked at $617M in Q2 2020. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Wellington Management Group held 1,042,764 shares of Tandem Diabetes Care worth $20M as of Q1 2026.
  • Wellington Management Group bought 944,455 Tandem Diabetes Care shares in Q1 2026, an estimated $20.5M.
  • Tandem Diabetes Care made up ﹤0.01% of Wellington Management Group's portfolio in Q1 2026, its #1013 holding.
  • Wellington Management Group first reported a position in Tandem Diabetes Care in Q1 2019 and has held it in 17 quarters since.
  • Wellington Management Group's Tandem Diabetes Care position peaked at $617M in Q2 2020.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

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