Tandem Diabetes Care, Inc.
US ˙ NasdaqGM ˙ US8753722037

SecurityTNDM / Tandem Diabetes Care, Inc.
InstitutionCwm, Llc
Latest Disclosed Ownership24,771 shares
Latest Disclosed Value $ 474,860
Cwm, Llc reports 1.32% increase in ownership of TNDM / Tandem Diabetes Care, Inc.

On May 14, 2026 - Cwm, Llc filed a 13F-HR form disclosing ownership of 24,771 shares of Tandem Diabetes Care, Inc. (US:TNDM) valued at $474,860 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 24,449 shares of Tandem Diabetes Care, Inc.. The current value of the position is $446,621 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)
2026-05-14 2026-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 24,771 322 1.32 475 0.0012
2026-01-26 2025-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 24,449 2,466 11.22 1 0.0015
2025-10-15 2025-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 21,983 19,187 686.23 0 0.0008
2025-07-25 2025-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 2,796 2,025 262.65 0 0.0002
2025-05-01 2025-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 771 -163 -17.45 0 0.0001
2025-02-04 2024-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 934 118 14.46 0 0.0001
2024-10-08 2024-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 816 27 3.42 0 0.0002
2024-07-10 2024-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 789 -11 -1.38 0 0.0002
2024-04-05 2024-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 800 19 2.43 0 0.0001
2024-02-01 2023-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 781 331 73.56 0 0.0001
2023-10-11 2023-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 450 -25 -5.26 0 0.0001
2023-08-03 2023-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 475 -1,184 -71.37 0 0.0001
2023-05-01 2023-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 1,659 89 5.67 0 0.0005
2023-02-01 2022-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 1,570 1,040 196.23 0 -100.00 0.0005
2022-10-27 2022-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 530 -511 -49.09 25 -59.68 0.0002
2022-07-28 2022-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 1,041 488 88.25 62 -3.12 0.0005
2022-04-21 2022-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 553 98 21.54 64 -5.88 0.0005
2022-01-31 2021-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 455 289 174.10 68 325.00 0.0005
2021-09-15 2021-06-30 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2021-07-29 2021-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 166 0 16 0.0001
2021-09-15 2021-03-31 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2021-04-27 2021-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 209 43 18 0.0002
2021-09-15 2020-12-31 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2021-01-27 2020-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 316 150 30 0.0003
2021-09-15 2020-09-30 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2020-10-19 2020-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 685 519 78 0.0009
2021-09-15 2020-06-30 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2020-07-22 2020-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 681 515 67 0.0008
2021-09-15 2020-03-31 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2020-04-28 2020-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 403 237 26 0.0004
2021-09-14 2019-12-31 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2020-01-27 2019-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 528 362 31 0.0004
2021-09-14 2019-09-30 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2019-10-22 2019-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 107 -59 6 0.0001
2021-09-14 2019-06-30 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 0 0.00 16 0.00 0.0001
2019-07-31 2019-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 107 -59 7 0.0001
2021-09-02 2019-03-31 13F/A-1 TANDEM DIABETES CARE COM NEW 875372203 166 59 55.14 16 300.00 0.0001
2019-04-22 2019-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 107 0 7 0.0001
2019-01-25 2018-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 107 107 4 0.0001
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.