DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionRathbone Brothers plc
Latest Disclosed Ownership63,994 shares
Latest Disclosed Value $ 4,018,823
Rathbone Brothers plc reports 46.62% decrease in ownership of DXCM / DexCom, Inc.

On May 12, 2026 - Rathbone Brothers plc filed a 13F-HR form disclosing ownership of 63,994 shares of DexCom, Inc. (MX:DXCM) valued at $4,018,823 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 6, 2026 disclosing 119,891 shares of DexCom, Inc.. This represents a change in shares of -46.62% 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)
2026-05-12 2026-03-31 13F DEXCOM INC USD0.001 COM 252131107 63,994 -55,897 -46.62 4,019 -49.50 0.0172
2026-02-06 2025-12-31 13F/A-1 DEXCOM INC USD0.001 COM 252131107 119,891 -18,632 -13.45 7,957 -14.63 0.0315
2026-01-21 2025-12-31 13F DEXCOM INC USD0.001 COM 252131107 119,891 -18,632 7,957 0.0315
2025-11-13 2025-09-30 13F DEXCOM INC USD0.001 COM 252131107 138,523 -551,828 -79.93 9,321 -84.53 0.0378
2025-08-07 2025-06-30 13F DEXCOM INC USD0.001 COM 252131107 690,351 -396,518 -36.48 60,261 -18.81 0.2599
2025-05-13 2025-03-31 13F DEXCOM INC USD0.001 COM 252131107 1,086,869 -72,144 -6.22 74,222 -17.66 0.3587
2025-02-13 2024-12-31 13F DEXCOM INC USD0.001 COM 252131107 1,159,013 24,314 2.14 90,136 18.49 0.4364
2024-11-13 2024-09-30 13F DEXCOM INC USD0.001 COM 252131107 1,134,699 -267,103 -19.05 76,070 -52.14 0.3839
2024-08-09 2024-06-30 13F DEXCOM INC USD0.001 COM 252131107 1,401,802 76,727 5.79 158,936 -13.52 0.8657
2024-05-14 2024-03-31 13F DEXCOM INC USD0.001 COM 252131107 1,325,075 -19,259 -1.43 183,788 10.17 1.0606
2024-02-13 2023-12-31 13F DEXCOM INC USD0.001 COM 252131107 1,344,334 82,120 6.51 166,818 41.65 1.0751
2023-11-13 2023-09-30 13F DEXCOM INC USD0.001 COM 252131107 1,262,214 120,870 10.59 117,765 -19.71 0.8540
2023-08-04 2023-06-30 13F DEXCOM INC USD0.001 COM 252131107 1,141,344 -22,657 -1.95 146,674 8.46 1.3688
2023-05-12 2023-03-31 13F DEXCOM INC USD0.001 COM 252131107 1,164,001 -31,552 -2.64 135,234 -0.11 1.3827
2023-02-14 2022-12-31 13F DEXCOM INC USD0.001 COM 252131107 1,195,553 -66,694 -5.28 135,384 33.17 1.5244
2022-11-14 2022-09-30 13F/A-1 DEXCOM INC USD0.001 COM 252131107 1,262,247 -4,300 -0.34 101,661 7.70 1.2543
2022-11-03 2022-09-30 13F DEXCOM INC USD0.001 COM 252131107 1,262,247 -4,300 101,661 1.2543
2022-08-12 2022-06-30 13F DEXCOM INC USD0.001 COM 252131107 1,266,547 969,091 325.79 94,396 -37.97 1.0821
2022-05-11 2022-03-31 13F DEXCOM INC USD0.001 COM 252131107 297,456 32,475 12.26 152,178 6.96 1.5527
2022-02-10 2021-12-31 13F DEXCOM INC USD0.001 COM 252131107 264,981 -858 -0.32 142,282 -2.13 1.3827
2021-11-04 2021-09-30 13F DEXCOM INC USD0.001 COM 252131107 265,839 -10,912 -3.94 145,377 23.02 1.5641
2021-07-30 2021-06-30 13F DEXCOM INC USD0.001 COM 252131107 276,751 197,982 251.35 118,173 317.44 1.3128
2021-05-14 2021-03-31 13F DEXCOM INC USD0.001 COM 252131107 78,769 29,364 59.44 28,309 54.98 0.3625
2021-02-11 2020-12-31 13F DEXCOM INC USD0.001 COM 252131107 49,405 42,209 586.56 18,266 515.85 0.2593
2020-11-13 2020-09-30 13F DEXCOM INC USD0.001 COM 252131107 7,196 674 10.33 2,966 12.18 0.0508
2020-08-07 2020-06-30 13F DEXCOM INC USD0.001 COM 252131107 6,522 2,500 62.16 2,644 144.14 0.0537
2020-05-04 2020-03-31 13F DEXCOM INC USD0.001 COM 252131107 4,022 22 0.55 1,083 23.77 0.0315
2020-02-11 2019-12-31 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 875 46.57 0.0230
2019-11-13 2019-09-30 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 597 -0.33 0.0170
2019-08-12 2019-06-30 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 599 25.84 0.0188
2019-05-09 2019-03-31 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 476 -0.63 0.0157
2019-02-12 2018-12-31 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 479 -16.26 0.0184
2018-10-12 2018-09-30 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 572 50.53 0.0194
2018-07-16 2018-06-30 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 380 27.95 0.0144
2018-04-06 2018-03-31 13F DEXCOM INC USD0.001 COM 252131107 4,000 0 0.00 297 29.13 0.0121
2018-01-24 2017-12-31 13F DEXCOM INC USD0.001 COM 252131107 4,000 4,000 0.00 230 -22.56 0.0094
2017-10-24 2017-09-30 13F DEXCOM INC USD0.001 COM 252131107 0 -4,000 -100.00 0 -100.00
2017-08-10 2017-06-30 13F DEXCOM INC USD0.001 COM 252131107 4,000 200 5.26 293 -9.01 0.0131
2017-04-06 2017-03-31 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 322 41.85 0.0147
2017-02-02 2016-12-31 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 227 -31.83 0.0114
2016-10-24 2016-09-30 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 333 10.63 0.0172
2016-08-03 2016-06-30 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 301 16.67 0.0166
2016-04-08 2016-03-31 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 258 -6.18 0.0157
2016-01-19 2015-12-31 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 275 -15.64 0.0175
2015-10-27 2015-09-30 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 326 7.24 0.0217
2015-08-05 2015-06-30 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 304 28.27 0.0197
2015-04-10 2015-03-31 13F DEXCOM INC USD0.001 COM 252131107 3,800 0 0.00 237 13.40 0.0157
2015-01-21 2014-12-31 13F DEXCOM INC USD0.001 COM 252131107 3,800 3,800 209 0.0137
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.