마지막으로 Diabetes Care, Inc.
MX ˙ BMV ˙ US8753722037
SecurityMX:TNDM / Tandem Diabetes Care, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership58,227 shares
Latest Disclosed Value $ 1,116,212
Renaissance Technologies Llc ownership in TNDM / Tandem Diabetes Care, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 58,227 shares of Tandem Diabetes Care, Inc. (MX:TNDM) valued at $1,116,212 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 0 shares of Tandem Diabetes Care, Inc..

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

Upgrade to unlock premium data and export to Excel .

Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 58,227 58,227 1,116 0.0017
2026-02-12 2025-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 0 -161,500 -100.00 0 -100.00
2025-11-13 2025-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 161,500 -180,827 -52.82 1,961 -69.28 0.0026
2025-08-13 2025-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 342,327 56,200 19.64 6,381 16.38 0.0085
2025-05-14 2025-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 286,127 -29,600 -9.38 5,482 -51.79 0.0083
2025-02-13 2024-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 315,727 105,300 50.04 11,372 27.43 0.0168
2024-11-13 2024-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 210,427 -85,396 -28.87 8,924 -25.12 0.0134
2024-08-09 2024-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 295,823 -298,504 -50.23 11,919 56,652.38 0.0202
2024-05-13 2024-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 594,327 576,100 3,160.70 21 0.0331
2024-02-13 2023-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 18,227 18,227 1 0.0008
2023-02-13 2022-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 0 -67,400 -100.00 0 -100.00
2022-11-14 2022-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 67,400 -85,827 -56.01 3,225 -64.44 0.0046
2022-08-12 2022-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 153,227 131,327 599.67 9,070 256.11 0.0107
2022-05-13 2022-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 21,900 -2,327 -9.60 2,547 -30.16 0.0030
2022-02-11 2021-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 24,227 -215,319 -89.89 3,647 -87.25 0.0045
2021-11-12 2021-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 239,546 205,119 595.81 28,597 752.88 0.0369
2021-08-13 2021-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 34,427 -136,700 -79.88 3,353 -77.80 0.0042
2021-05-13 2021-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 171,127 -145,300 -45.92 15,102 -50.12 0.0188
2021-02-10 2020-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 316,427 -126,669 -28.59 30,276 -39.80 0.0329
2020-11-13 2020-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 443,096 -392,332 -46.96 50,291 -39.15 0.0502
2020-08-13 2020-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 835,428 340,500 68.80 82,641 159.48 0.0713
2020-05-14 2020-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 494,928 -189,972 -27.74 31,849 -21.99 0.0309
2020-02-13 2019-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 684,900 -608,727 -47.06 40,827 -46.49 0.0314
2019-11-13 2019-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 1,293,627 395,700 44.07 76,298 31.70 0.0646
2019-08-12 2019-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 897,927 123,500 15.95 57,934 17.81 0.0510
2019-05-14 2019-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 774,427 -637,900 -45.17 49,176 -8.30 0.0447
2019-02-12 2018-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 1,412,327 1,016,733 257.01 53,626 216.43 0.0587
2018-11-13 2018-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 395,594 189,230 91.70 16,947 272.95 0.0174
2018-08-13 2018-06-30 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 206,364 49,137 31.25 4,544 482.56 0.0050
2018-08-13 2018-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 157,227 780
2018-05-14 2018-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 157,227 130,377 485.58 780 1,138.10 0.0009
2018-02-13 2017-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 26,850 -218,450 -89.05 63 -64.80 0.0001
2017-11-13 2017-09-30 13F TANDEM DIABETES CARE COM 875372104 245,300 67,500 37.96 179 26.06 0.0002
2017-08-11 2017-06-30 13F TANDEM DIABETES CARE COM 875372104 177,800 11,400 6.85 142 -29.00 0.0002
2017-05-12 2017-03-31 13F TANDEM DIABETES CARE COM 875372104 166,400 -138,000 -45.34 200 -69.42 0.0003
2017-02-13 2016-12-31 13F TANDEM DIABETES CARE COM 875372104 304,400 -52,000 -14.59 654 -76.04 0.0010
2016-11-14 2016-09-30 13F TANDEM DIABETES CARE COM 875372104 356,400 62,100 21.10 2,730 23.03 0.0048
2016-08-12 2016-06-30 13F TANDEM DIABETES CARE COM 875372104 294,300 55,000 22.98 2,219 6.48 0.0042
2016-05-13 2016-03-31 13F TANDEM DIABETES CARE COM 875372104 239,300 75,000 45.65 2,084 7.42 0.0040
2016-02-11 2015-12-31 13F TANDEM DIABETES CARE COM 875372104 164,300 25,471 18.35 1,940 58.63 0.0042
2015-11-12 2015-09-30 13F TANDEM DIABETES CARE COM 875372104 138,829 -85,371 -38.08 1,223 -49.67 0.0029
2015-08-14 2015-06-30 13F TANDEM DIABETES CARE COM 875372104 224,200 135,100 151.63 2,430 116.19 0.0055
2015-05-13 2015-03-31 13F TANDEM DIABETES CARE COM 875372104 89,100 89,100 1,124 0.0024
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.