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TNDM — TANDEM DIABETES CARE INC

Reported value held$599.87M
Funds holding (latest)49
SectorHealth Care
Funds holding (Q2 2026)35
Institutional value$355.91M · 69.76M sh
New / Add / Cut / Exit2 / 18 / 14 / 5
Top-5 / Top-10 concentration54.6% / 72.0%
Institutional holdings change Accumulating +35.1% (+18.12M sh)
Institutional value change Down -32.2%

As of Q2 2026, 35 SEC-registered investment managers reported holding TNDM (TANDEM DIABETES CARE INC) in their latest 13F filings, with a combined reported value of $355.91M across 69.76M shares. That is +35.1% by share count (+18.12M shares) versus the previous quarter, while reported value moved -32.2%. Ownership is concentrated: the five largest holders account for 54.6% of reported value and the top ten for 72.0%.

Compared with the prior quarter, 2 opened new positions, 18 added to existing stakes, 14 trimmed, 5 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.

TNDM is classified in the Health Care sector.

All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.

FundQuarterSharesValuePortfolio WeightChange
Vanguard Group history Q4 2025 7.34M $161.36M 0.00% Add
UBS Group AG history Q2 2026 6.33M $95.45M 0.01% Reduce
Citadel Advisors history Q2 2026 1.85M $27.98M 0.00% Reduce
Marshall Wace history Q1 2026 1.44M $27.65M 0.03% Add
Geode Capital Management history Q2 2026 1.80M $27.18M 0.00% Add
Balyasny Asset Management history Q2 2026 25.00M $23.86M 0.03% New
Baillie Gifford & Co history Q1 2026 1.09M $20.88M 0.02% Reduce
Millennium Management history Q2 2026 1.31M $19.79M 0.01% Add
Capital World Investors history Q2 2025 767.00K $14.30M 0.00% Hold
Point72 Asset Management history Q2 2026 910.90K $13.75M 0.02% Reduce
Royce & Associates history Q2 2026 900.59K $13.59M 0.11% Add
Wellington Management Group history Q2 2026 871.81K $13.16M 0.00% Reduce
Northern Trust Corp history Q2 2026 753.69K $11.37M 0.00% Add
D. E. Shaw & Co history Q2 2026 681.81K $10.29M 0.01% Reduce
Arrowstreet Capital history Q2 2026 667.69K $10.08M 0.00% Add
Charles Schwab Investment Management history Q2 2026 656.84K $9.91M 0.00% Add
Goldman Sachs Group history Q2 2026 10.44M $9.87M 0.00% Add
Morgan Stanley history Q2 2026 647.07K $9.76M 0.00% Reduce
Two Sigma Investments history Q2 2026 558.41K $8.43M 0.01% Reduce
AQR Capital Management history Q2 2026 533.84K $8.06M 0.00% Add

View all 49 fund holders →

New Positions (Q2 2026)

Fully Exited (vs previous quarter)

Fund Position History — shares by quarter (top 20 funds)

FundQ3 2021Q4 2021Q1 2022Q2 2022Q3 2022Q4 2022Q1 2023Q2 2023Q3 2023Q4 2023Q1 2024Q2 2024Q3 2024Q4 2024Q1 2025Q2 2025Q3 2025Q4 2025Q1 2026Q2 2026
UBS Group AG 285.06K 404.91K 316.16K 112.51K 64.95K 37.66K 68.39K 130.60K 32.81K 45.27K 2.79M 3.04M 2.97M 3.37M 3.58M 4.13M 4.25M 3.16M 7.23M 6.33M
Citadel Advisors 513.32K 1.16M 673.99K 271.50K 552.51K 501.72K 292.65K 242.22K 740.36K 433.71K 670.67K 1.97M 445.62K 235.73K 192.13K 419.16K 138.70K 2.15M 2.28M 1.85M
Geode Capital Management 801.05K 823.80K 854.24K 854.93K 865.99K 914.37K 936.68K 973.35K 999.31K 1.04M 1.08M 1.51M 1.53M 1.53M 1.56M 1.61M 1.60M 1.65M 1.68M 1.80M
Balyasny Asset Management — 171.48K 102.89K — 293.52K 645.89K 280.19K — — 106.41K 234.52K 8.63K — — 769.74K 230.93K — 262.79K — 25.00M
Millennium Management 179.46K 213.65K 456.09K 93.38K 73.08K 613.34K 294.90K 1.09M 583.87K 640.84K 1.05M 1.16M 1.47M 161.34K 227.59K 969.07K 705.90K 583.57K 761.67K 1.31M
Point72 Asset Management 356.67K 134.67K 571.67K — 82.74K 359.61K — — 1.31K 990.34K 35.00K — 240.71K 495.31K — — — 4.00M 7.50M 910.90K
Royce & Associates — — — — — — — — — — — — — — — — 510.00K 650.25K 696.59K 900.59K
Wellington Management Group 458.64K 708.62K 700.51K 683.44K 328.87K — — — — — — — — — — — — 98.31K 1.04M 871.81K
Northern Trust Corp 489.56K 492.94K 483.77K 470.75K 604.04K 596.42K 364.14K 368.88K 376.89K 350.82K 342.52K 364.54K 635.69K 697.46K 689.53K 700.38K 690.88K 691.69K 706.61K 753.69K
D. E. Shaw & Co 63.16K 92.12K 55.64K 43.99K 39.10K 208.69K 245.57K 643.76K 280.94K 229.64K 71.43K — — 37.30K — 338.67K 947.22K 924.27K 783.91K 681.81K
Arrowstreet Capital — — 9.49K 111.90K — — — — — — — — — — — 12.41K — 135.75K 193.56K 667.69K
Charles Schwab Investment Management 477.46K 491.26K 503.58K 503.81K 333.96K 342.53K 348.45K 350.43K 367.01K 396.74K 417.54K 567.19K 586.06K 602.32K 570.15K 617.00K 558.45K 646.31K 642.60K 656.84K
Goldman Sachs Group 982.75K 929.29K 821.61K 653.79K 290.62K 341.69K 146.48K 83.83K 80.81K 225.72K 118.84K 191.72K 647.75K 678.49K 712.56K 1.89M 1.43M 1.68M 2.22M 10.44M
Morgan Stanley 309.86K 476.30K 173.10K 531.46K 324.59K 475.55K 931.77K 403.29K 774.64K 872.16K 1.40M 2.20M 2.20M 1.60M 1.14M 3.93M 737.55K 2.08M 1.36M 647.07K
Two Sigma Investments 10.40K 13.40K 38.58K 524.25K 664.78K 879.71K 922.48K 1.21M 780.53K 701.35K 1.02M 1.14M 824.71K 861.19K 641.44K 1.23M 1.12M 1.20M 1.86M 558.41K
AQR Capital Management 1.71K 3.82K 23.27K 27.44K — — 4.95K — — — — 7.33K 8.49K 13.90K 12.07K 41.00K 415.14K 339.58K 331.92K 533.84K
BlackRock Inc — — — — — — — — — — — — 11.11M 11.70M 3.35M 3.15M 3.15M 3.95M 5.15M 7.03M
Bank of America Corp 109.76K 121.77K 103.82K 223.81K 128.50K 115.97K 255.44K 85.14K 90.18K 82.87K 536.17K 632.87K 445.61K 317.71K 1.10M 1.35M 1.34M 702.50K 373.22K 395.05K
JPMorgan Chase & Co 148.74K 94.94K 133.40K 145.22K 161.00K 201.70K 108.14K 200.65K 159.42K 86.42K 93.66K 84.23K 197.58K 392.59K 1.33M 562.25K 359.07K 984.00K — 349.65K
Principal Global Investors 231.83K 267.42K 249.39K 253.86K 250.66K 254.13K 387.61K 373.90K 355.15K 344.35K 356.39K 448.09K 370.32K 388.35K 399.45K 395.23K 326.70K 324.26K 331.54K 335.09K

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