DexCom, Inc.
US ˙ NasdaqGS ˙ US2521311074

SecurityDXCM / DexCom, Inc.
InstitutionShell Asset Management Co
Latest Disclosed Ownership7,936 shares
Latest Disclosed Value $ 534
Shell Asset Management Co reports 77.84% decrease in ownership of DXCM / DexCom, Inc.

On November 7, 2025 - Shell Asset Management Co filed a 13F-HR form disclosing ownership of 7,936 shares of DexCom, Inc. (US:DXCM) valued at $534,013 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 23, 2025 disclosing 35,812 shares of DexCom, Inc.. This represents a change in shares of -77.84% during the quarter. The current value of the position is $576,074 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)
2025-11-07 2025-09-30 13F DEXCOM COM 252131107 7,936 -27,876 -77.84 1 -100.00 0.0536
2025-07-23 2025-06-30 13F DEXCOM COM 252131107 35,812 5,138 16.75 3 50.00 0.1079
2025-05-14 2025-03-31 13F DEXCOM COM 252131107 30,674 -1,026 -3.24 2 0.00 0.0995
2025-02-14 2024-12-31 13F DEXCOM COM 252131107 31,700 -1,509 -4.54 2 0.00 0.1077
2024-11-07 2024-09-30 13F DEXCOM COM 252131107 33,209 1,688 5.36 2 -33.33 0.0980
2024-07-25 2024-03-31 13F DEXCOM COM 252131107 31,521 -5,789 -15.52 4 -25.00 0.1627
2024-02-14 2023-12-31 13F DEXCOM COM 252131107 37,310 -9,727 -20.68 5 0.00 0.2138
2023-11-08 2023-09-30 13F DEXCOM COM 252131107 47,037 -1,077 -2.24 4 -33.33 0.1814
2023-07-28 2023-06-30 13F DEXCOM COM 252131107 48,114 21,821 82.99 6 100.00 0.2439
2023-05-15 2023-03-31 13F DEXCOM COM 252131107 26,293 -325 -1.22 3 0.00 0.1268
2023-02-07 2022-12-31 13F DEXCOM COM 252131107 26,618 -4,533 -14.55 3 -99.88 0.1320
2022-11-14 2022-09-30 13F DEXCOM COM 252131107 31,151 -7,497 -19.40 2,509 -12.88 0.0978
2022-08-09 2022-06-30 13F DEXCOM COM 252131107 38,648 30,188 356.83 2,880 -33.46 0.0852
2022-05-04 2022-03-31 13F DEXCOM COM 252131107 8,460 -641 -7.04 4,328 -11.44 0.1022
2022-02-09 2021-12-31 13F DEXCOM COM 252131107 9,101 1,056 13.13 4,887 11.09 0.1003
2021-11-04 2021-09-30 13F DEXCOM COM 252131107 8,045 -143 -1.75 4,399 25.83 0.0988
2021-08-12 2021-06-30 13F DEXCOM COM 252131107 8,188 -126 -1.52 3,496 17.00 0.0678
2021-05-10 2021-03-31 13F DEXCOM COM 252131107 8,314 -1,304 -13.56 2,988 -15.97 0.0598
2021-02-16 2020-12-31 13F DEXCOM COM 252131107 9,618 3,866 67.21 3,556 49.98 0.0734
2020-11-13 2020-09-30 13F DEXCOM COM 252131107 5,752 2,841 97.60 2,371 100.93 0.0551
2020-08-10 2020-06-30 13F DEXCOM COM 252131107 2,911 -1,130 -27.96 1,180 8.46 0.0295
2020-05-11 2020-03-31 13F DEXCOM COM 252131107 4,041 -641 -13.69 1,088 6.25 0.0303
2020-02-13 2019-12-31 13F DEXCOM COM 252131107 4,682 -1,525 -24.57 1,024 10.58 0.0221
2019-11-12 2019-09-30 13F DEXCOM COM 252131107 6,207 0 0.00 926 -0.43 0.0211
2019-08-12 2019-06-30 13F DEXCOM COM 252131107 6,207 -5,841 -48.48 930 -35.19 0.0206
2019-05-09 2019-03-31 13F DEXCOM COM 252131107 12,048 -4,048 -25.15 1,435 -25.57 0.0316
2019-02-13 2018-12-31 13F DEXCOM COM 252131107 16,096 5,407 50.58 1,928 26.10 0.0481
2018-11-13 2018-09-30 13F DEXCOM COM 252131107 10,689 5,659 112.50 1,529 521.54 0.0302
2017-10-20 2017-09-30 13F/A-1 DEXCOM COM 252131107 5,030 -776 -13.37 246 -42.12 0.0055
2017-07-26 2017-06-30 13F DEXCOM COM 252131107 5,806 -18,081 -75.69 425 -79.00 0.0105
2017-04-26 2017-03-31 13F DEXCOM COM 252131107 23,887 2,314 10.73 2,024 57.14 0.0517
2017-01-10 2016-12-31 13F DEXCOM COM 252131107 21,573 21,573 1,288 0.0348
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.