DexCom, Inc.
US ˙ NasdaqGS ˙ US2521311074

SecurityDXCM / DexCom, Inc.
InstitutionTobam
Latest Disclosed Ownership63,622 shares
Latest Disclosed Value $ 3,995
Tobam reports 8.59% decrease in ownership of DXCM / DexCom, Inc.

On May 12, 2026 - Tobam filed a 13F-HR form disclosing ownership of 63,622 shares of DexCom, Inc. (US:DXCM) valued at $3,995,462 USD as of March 31, 2026. The entity filed a previous 13F-HR on March 2, 2026 disclosing 69,604 shares of DexCom, Inc.. This represents a change in shares of -8.59% during the quarter. The current value of the position is $4,629,773 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)
2026-05-12 2026-03-31 13F DEXCOM COM 252131107 63,622 -5,982 -8.59 4 -25.00 1.0399
2026-03-02 2025-12-31 13F DEXCOM COM 252131107 69,604 9,656 16.11 5 0.00 1.1346
2025-11-07 2025-09-30 13F DEXCOM COM 252131107 59,948 10,193 20.49 4 0.00 1.4615
2025-08-08 2025-06-30 13F DEXCOM COM 252131107 49,755 3,514 7.60 4 33.33 1.6949
2025-04-16 2025-03-31 13F DEXCOM COM 252131107 46,241 -10,493 -18.50 3 -25.00 1.3496
2025-01-28 2024-12-31 13F DEXCOM COM 252131107 56,734 -37,014 -39.48 4 -33.33 1.3463
2024-10-09 2024-09-30 13F DEXCOM COM 252131107 93,748 92,719 9,010.59 6 1.1460
2024-08-01 2024-06-30 13F/A-1 DEXCOM COM 252131107 1,029 -959 -48.24 0 0.0183
2024-07-29 2024-06-30 13F DEXCOM COM 252131107 1,029 -959 0 0.0183
2024-05-02 2024-03-31 13F DEXCOM COM 252131107 1,988 275 16.05 0 0.0247
2024-01-26 2023-12-31 13F DEXCOM COM 252131107 1,713 -781 -31.32 0 0.0186
2023-10-31 2023-09-30 13F DEXCOM COM 252131107 2,494 335 15.52 0 0.0187
2023-07-31 2023-06-30 13F DEXCOM COM 252131107 2,159 0 0.00 0 0.0209
2023-05-03 2023-03-31 13F DEXCOM COM 252131107 2,159 1,246 136.47 0 0.0165
2023-02-02 2022-12-31 13F DEXCOM COM 252131107 913 -826 -47.50 0 -100.00 0.0068
2022-11-02 2022-09-30 13F DEXCOM COM 252131107 1,739 -3,629 -67.60 140 -65.00 0.0098
2022-08-02 2022-06-30 13F DEXCOM COM 252131107 5,368 4,200 359.59 400 -33.11 0.0251
2022-04-25 2022-03-31 13F DEXCOM COM 252131107 1,168 -620 -34.68 598 -37.71 0.0301
2022-02-15 2021-12-31 13F DEXCOM COM 252131107 1,788 -320 -15.18 960 -16.74 0.0432
2021-11-12 2021-09-30 13F DEXCOM COM 252131107 2,108 -246 -10.45 1,153 14.73 0.0489
2021-08-11 2021-06-30 13F DEXCOM COM 252131107 2,354 -2,889 -55.10 1,005 -46.66 0.0402
2021-05-11 2021-03-31 13F DEXCOM COM 252131107 5,243 -19,730 -79.01 1,884 -79.59 0.0800
2021-02-03 2020-12-31 13F DEXCOM COM 252131107 24,973 -57,242 -69.62 9,233 -72.76 0.4110
2020-11-12 2020-09-30 13F DEXCOM COM 252131107 82,215 -11,922 -12.66 33,891 -11.19 1.6959
2020-08-17 2020-06-30 13F DEXCOM COM 252131107 94,137 -5,782 -5.79 38,163 41.84 2.4559
2020-05-07 2020-03-31 13F DEXCOM COM 252131107 99,919 -10,062 -9.15 26,905 11.84 2.1279
2020-02-10 2019-12-31 13F DEXCOM COM 252131107 109,981 -34,261 -23.75 24,057 11.75 1.4743
2019-11-12 2019-09-30 13F DEXCOM COM 252131107 144,242 -27,478 -16.00 21,527 -16.34 1.3895
2019-08-13 2019-06-30 13F DEXCOM COM 252131107 171,720 -20,474 -10.65 25,731 12.41 1.4306
2019-05-15 2019-03-31 13F DEXCOM COM 252131107 192,194 53,181 38.26 22,890 37.44 1.1575
2019-02-11 2018-12-31 13F DEXCOM COM 252131107 139,013 139,013 -27.67 16,654 -27.24 0.8015
2018-05-14 2018-03-31 13F DEXCOM COM 252131107 0 -1,534 -100.00 0 -100.00
2018-02-14 2017-12-31 13F DEXCOM COM 252131107 1,534 -74,886 -97.99 88 -97.65 0.0038
2017-11-14 2017-09-30 13F DEXCOM COM 252131107 76,420 48,386 172.60 3,739 82.30 0.1413
2017-08-08 2017-06-30 13F DEXCOM COM 252131107 28,034 -5,377 -16.09 2,051 -27.55 0.0766
2017-05-09 2017-03-31 13F DEXCOM COM 252131107 33,411 33,411 2,831 0.1093
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.