Tandem Diabetes Care, Inc.
US ˙ NasdaqGM ˙ US8753722037

SecurityTNDM / Tandem Diabetes Care, Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Engineers Gate Manager LP closes position in TNDM / Tandem Diabetes Care, Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 0 shares of Tandem Diabetes Care, Inc. (US:TNDM) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 88,547 shares of Tandem Diabetes Care, Inc.. The current value of the position is $0 USD.

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.

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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)
2026-05-15 2026-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 0 -100.00 0
2026-02-17 2025-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 88,547 88,547 1,946 0.0231
2025-11-14 2025-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 0 -100.00 0
2025-08-14 2025-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 170,488 -20,417 -10.69 3,178 -13.13 0.0395
2025-05-15 2025-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 190,905 -31,900 -14.32 3,658 -54.43 0.0617
2025-02-14 2024-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 222,805 143,702 181.66 8,025 139.27 0.1397
2024-11-14 2024-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 79,103 -16,985 -17.68 3,355 -13.36 0.0655
2024-08-14 2024-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 96,088 11,141 13.12 3,871 28.73 0.0873
2024-05-15 2024-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 84,947 84,947 3,008 0.0792
2023-11-14 2023-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 0 -8,504 -100.00 0 -100.00
2023-08-14 2023-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 8,504 8,504 209 0.0079
2023-05-15 2023-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 0 -36,977 -100.00 0 -100.00
2023-02-14 2022-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 36,977 27,467 288.82 1,662 265.27 0.0998
2022-11-14 2022-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 9,510 -103,949 -91.62 455 -93.23 0.0283
2022-08-15 2022-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 113,459 104,331 1,142.98 6,716 532.99 0.2462
2022-05-16 2022-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 9,128 -1,662 -15.40 1,061 -34.67 0.0415
2022-02-14 2021-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 10,790 -1,926 -15.15 1,624 6.98 0.0730
2021-11-15 2021-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 12,716 4,492 54.62 1,518 89.51 0.0865
2021-08-16 2021-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 8,224 -7,618 -48.09 801 -42.70 0.0515
2021-05-17 2021-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 15,842 -15,808 -49.95 1,398 -53.83 0.0693
2021-02-16 2020-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 31,650 15,662 97.96 3,028 66.83 0.1313
2020-11-16 2020-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 15,988 15,988 1,815 0.0852
2020-08-17 2020-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 0 -3,359 -100.00 0 -100.00
2020-05-15 2020-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 3,359 -5,921 -63.80 216 -60.94 0.0156
2020-02-14 2019-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 9,280 -21,686 -70.03 553 -69.72 0.0243
2019-11-14 2019-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 30,966 30,966 1,826 0.0927
2019-05-15 2019-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 0 -24,873 -100.00 0 -100.00
2019-02-14 2018-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 24,873 -66,350 -72.73 944 -75.84 0.0755
2018-11-01 2018-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 91,223 -7,538 -7.63 3,908 79.68 0.3002
2018-08-03 2018-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 98,761 98,761 2,175 0.1695
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.