State of Wisconsin Investment Board
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State of Wisconsin Investment Board’s Tandem Diabetes Care TNDM Stock Holding History

State of Wisconsin Investment Board’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 		$816K Sell
42,578
-512
-1% -$11.1K ﹤0.01% 1776
2025
Q4 		$947K Sell
43,090
-21,591
-33% -$390K ﹤0.01% 1702
2025
Q3 		$785K Sell
64,681
-95,938
-60% -$1.3M ﹤0.01% 1705
2025
Q2 		$2.99M Buy
160,619
+4,407
+3% +$87.3K 0.01% 1123
2025
Q1 		$2.99M Buy
156,212
+13,750
+10% +$402K 0.01% 1101
2024
Q4 		$5.13M Buy
142,462
+35,875
+34% +$1.21M 0.01% 937
2024
Q3 		$4.52M Sell
106,587
-21,024
-16% -$891K 0.01% 995
2024
Q2 		$5.14M Buy
127,611
+24,354
+24% +$1.02M 0.01% 908
2024
Q1 		$3.66M Sell
103,257
-12,751
-11% -$342K 0.01% 1061
2023
Q4 		$3.43M Buy
116,008
+31,393
+37% +$651K 0.01% 1106
2023
Q3 		$1.76M Sell
84,615
-2,981
-3% -$81.9K 0.01% 1284
2023
Q2 		$2.15M Sell
87,596
-3,792
-4% -$122K 0.01% 1274
2023
Q1 		$3.71M Sell
91,388
-8,018
-8% -$332K 0.01% 1105
2022
Q4 		$4.47M Buy
99,406
+6,051
+6% +$274K 0.01% 997
2022
Q3 		$4.47M Sell
93,355
-4,128
-4% -$226K 0.01% 997
2022
Q2 		$5.77M Buy
97,483
+11,459
+13% +$941K 0.02% 932
2022
Q1 		$10M Buy
86,024
+21,786
+34% +$2.54M 0.02% 783
2021
Q4 		$9.67M Sell
64,238
-97
-0.2% -$13.1K 0.02% 790
2021
Q3 		$7.68M Buy
64,335
+359
+0.6% +$39.6K 0.02% 868
2021
Q2 		$6.23M Sell
63,976
-386
-0.6% -$34.4K 0.01% 977
2021
Q1 		$5.68M Sell
64,362
-104
-0.2% -$9.66K 0.01% 973
2020
Q4 		$6.17M Sell
64,466
-7,260
-10% -$748K 0.01% 913
2020
Q3 		$8.14M Buy
71,726
+250
+0.3% +$26.3K 0.02% 713
2020
Q2 		$7.07M Buy
71,476
+24,176
+51% +$1.93M 0.02% 751
2020
Q1 		$3.04M Buy
+47,300
New +$3.31M 0.01% 954

Other funds holding TNDM

BlackRock
BlackRock New York $6.73T AUM 46.02% 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 $3.37T AUM 44.26% 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

State of Wisconsin Investment Board's TNDM Position: Q1 2026 in Review

State of Wisconsin Investment Board reduced its Tandem Diabetes Care (TNDM) stake by 1.2% in Q1 2026, selling an estimated $11.1K and leaving 42,578 shares worth $816K. The position accounts for ﹤0.01% of the portfolio, ranked #1776.

State of Wisconsin Investment Board first reported a position in TNDM in Q1 2020 and has held it in 25 quarters since. The position peaked at $10M in Q1 2022. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • State of Wisconsin Investment Board held 42,578 shares of Tandem Diabetes Care worth $816K as of Q1 2026.
  • State of Wisconsin Investment Board sold 512 Tandem Diabetes Care shares in Q1 2026, an estimated $11.1K.
  • Tandem Diabetes Care made up ﹤0.01% of State of Wisconsin Investment Board's portfolio in Q1 2026, its #1776 holding.
  • State of Wisconsin Investment Board first reported a position in Tandem Diabetes Care in Q1 2020 and has held it in 25 quarters since.
  • State of Wisconsin Investment Board's Tandem Diabetes Care position peaked at $10M in Q1 2022.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on State of Wisconsin Investment Board's 13F filing for Q1 2026, filed 15 May 2026.