Two Sigma Investments
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Two Sigma Investments’s Tandem Diabetes Care TNDM Stock Holding History

Two Sigma Investments’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
2022
Q1 		– Sell
-4,500
Closed -$677K – 4267
2021
Q4 		$677K Sell
4,500
-1,900
-30% -$256K ﹤0.01% 2935
2021
Q3 		$764K Sell
6,400
-12,600
-66% -$1.39M ﹤0.01% 2873
2021
Q2 		$1.85M Buy
19,000
+9,200
+94% +$820K ﹤0.01% 1936
2021
Q1 		$865K Sell
9,800
-34,600
-78% -$3.22M ﹤0.01% 2454
2020
Q4 		$4.25M Buy
44,400
+10,400
+31% +$1.07M 0.01% 1027
2020
Q3 		$3.86M Buy
34,000
+10,600
+45% +$1.11M 0.01% 930
2020
Q2 		$2.31M Sell
23,400
-11,900
-34% -$950K 0.01% 1024
2020
Q1 		$2.27M Buy
35,300
+22,900
+185% +$1.6M 0.02% 900
2019
Q4 		$739K Sell
12,400
-6,000
-33% -$370K ﹤0.01% 2472
2019
Q3 		$1.08M Buy
18,400
+9,800
+114% +$626K ﹤0.01% 1920
2019
Q2 		$555K Buy
+8,600
New +$555K ﹤0.01% 2414
2019
Q1 		– Sell
-22,100
Closed -$839K – 3473
2018
Q4 		$839K Buy
+22,100
New +$780K ﹤0.01% 1761

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

Two Sigma Investments's TNDM Position: Q1 2026 in Review

Two Sigma Investments increased its Tandem Diabetes Care (TNDM) stake by 55% in Q1 2026, buying an estimated $14.4M and bringing the position to 1,864,194 shares worth $35.7M. The position accounts for 0.03% of the portfolio, ranked #645.

Two Sigma Investments first reported a position in TNDM in Q1 2014 and has held it in 29 quarters since. The position peaked at $56.7M in Q1 2019. 272 funds tracked by Wall St. Rank hold TNDM as of Q1 2026.

  • Two Sigma Investments held 1,864,194 shares of Tandem Diabetes Care worth $35.7M as of Q1 2026.
  • Two Sigma Investments bought 662,667 Tandem Diabetes Care shares in Q1 2026, an estimated $14.4M.
  • Tandem Diabetes Care made up 0.03% of Two Sigma Investments's portfolio in Q1 2026, its #645 holding.
  • Two Sigma Investments first reported a position in Tandem Diabetes Care in Q1 2014 and has held it in 29 quarters since.
  • Two Sigma Investments's Tandem Diabetes Care position peaked at $56.7M in Q1 2019.
  • 272 funds tracked by Wall St. Rank held Tandem Diabetes Care as of Q1 2026.

Based on Two Sigma Investments's 13F filing for Q1 2026, filed 15 May 2026.