Tandem Diabetes Care, Inc.
MX ˙ BMV ˙ US8753722037
SecurityMX:TNDM / Tandem Diabetes Care, Inc.
InstitutionAlgert Global Llc
Latest Disclosed Ownership117,799 shares
Latest Disclosed Value $ 2,258
Algert Global Llc reports 8.13% increase in ownership of TNDM / Tandem Diabetes Care, Inc.

On May 14, 2026 - Algert Global Llc filed a 13F-HR form disclosing ownership of 117,799 shares of Tandem Diabetes Care, Inc. (MX:TNDM) valued at $2,258 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 108,939 shares of Tandem Diabetes Care, Inc.. This represents a change in shares of 8.13% during the quarter.

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 117,799 8,860 8.13 2 0.00 0.0340
2026-02-17 2025-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 108,939 -117,947 -51.99 2 0.00 0.0373
2025-11-14 2025-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 226,886 -304,028 -57.27 3 -77.78 0.0461
2025-08-14 2025-06-30 13F ANDEM DIABETES CARE COM NEW 875372203 530,914 321,594 153.64 10 125.00 0.2073
2025-05-13 2025-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 209,320 119,784 133.78 4 33.33 0.0992
2025-02-14 2024-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 89,536 52,423 141.25 3 200.00 0.0759
2024-11-12 2024-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 37,113 -8,150 -18.01 2 0.00 0.0423
2024-08-15 2024-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 45,263 6,150 15.72 2 0.00 0.0607
2024-05-15 2024-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 39,113 27,970 251.01 1 0.0542
2024-02-14 2023-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 11,143 -31,500 -73.87 0 0.0133
2023-11-13 2023-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 42,643 9,270 27.78 1 0.0417
2023-08-14 2023-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 33,373 -59,253 -63.97 1 -100.00 0.0356
2023-05-12 2023-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 92,626 27,380 41.96 4 50.00 0.1776
2023-02-14 2022-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 65,246 4,065 6.64 3 -99.93 0.1625
2022-11-15 2022-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 61,181 2,189 3.71 2,928 -16.15 0.1769
2022-08-15 2022-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 58,992 11,261 23.59 3,492 -37.09 0.2625
2022-05-16 2022-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 47,731 13,412 39.08 5,551 7.45 0.3634
2022-02-14 2021-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 34,319 -2,099 -5.76 5,166 18.81 0.6452
2021-11-15 2021-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 36,418 2,338 6.86 4,348 31.00 0.5786
2021-08-13 2021-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 34,080 19,866 139.76 3,319 164.67 1.1174
2021-05-14 2021-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 14,214 -2,969 -17.28 1,254 -23.72 0.4011
2021-02-12 2020-12-31 13F TANDEM DIABETES CARE COM NEW 875372203 17,183 -20 -0.12 1,644 -15.82 0.4688
2020-11-16 2020-09-30 13F TANDEM DIABETES CARE COM NEW 875372203 17,203 840 5.13 1,953 20.63 0.6201
2020-08-12 2020-06-30 13F TANDEM DIABETES CARE COM NEW 875372203 16,363 11,840 261.77 1,619 456.36 0.5497
2020-05-13 2020-03-31 13F TANDEM DIABETES CARE COM NEW 875372203 4,523 4,523 291 0.1227
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.