DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionOppenheimer Asset Management Inc.
Latest Disclosed Ownership72,703 shares
Latest Disclosed Value $ 4,565,749
Oppenheimer Asset Management Inc. reports 4.03% increase in ownership of DXCM / DexCom, Inc.

On April 23, 2026 - Oppenheimer Asset Management Inc. filed a 13F-HR form disclosing ownership of 72,703 shares of DexCom, Inc. (MX:DXCM) valued at $4,565,749 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 69,886 shares of DexCom, Inc.. This represents a change in shares of 4.03% 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)
2026-04-23 2026-03-31 13F DEXCOM COM 252131107 72,703 2,817 4.03 4,566 -1.57 0.0130
2026-02-02 2025-12-31 13F DEXCOM COM 252131107 69,886 -17,765 -20.27 4,638 -21.36 0.0570
2025-11-06 2025-09-30 13F DEXCOM COM 252131107 87,651 -13,360 -13.23 5,898 -33.11 0.0649
2025-07-31 2025-06-30 13F DEXCOM COM 252131107 101,011 -869 -0.85 8,817 26.74 0.1011
2025-04-23 2025-03-31 13F DEXCOM COM 252131107 101,880 10,094 11.00 6,957 -2.54 0.0863
2025-02-05 2024-12-31 13F DEXCOM COM 252131107 91,786 11,871 14.85 7,138 33.25 0.0868
2024-11-05 2024-09-30 13F DEXCOM COM 252131107 79,915 -53,993 -40.32 5,358 -64.71 0.0645
2024-08-08 2024-06-30 13F DEXCOM COM 252131107 133,908 17,443 14.98 15,182 -6.01 0.1939
2024-05-07 2024-03-31 13F DEXCOM COM 252131107 116,465 -5,811 -4.75 16,154 6.46 0.2367
2024-02-13 2023-12-31 13F DEXCOM COM 252131107 122,276 33,580 37.86 15,173 83.36 0.2111
2023-11-08 2023-09-30 13F DEXCOM COM 252131107 88,696 -1,907 -2.10 8,275 -28.93 0.1270
2023-08-03 2023-06-30 13F DEXCOM COM 252131107 90,603 -839 -0.92 11,643 9.60 0.1713
2023-05-10 2023-03-31 13F DEXCOM COM 252131107 91,442 -3,430 -3.62 10,624 -1.12 0.1636
2023-02-07 2022-12-31 13F DEXCOM COM 252131107 94,872 -2,139 -2.20 10,743 37.50 0.1729
2022-11-14 2022-09-30 13F DEXCOM COM 252131107 97,011 -1,725 -1.75 7,813 6.17 0.1378
2022-08-08 2022-06-30 13F DEXCOM COM 252131107 98,736 74,253 303.28 7,359 -41.25 0.1233
2022-05-12 2022-03-31 13F DEXCOM COM 252131107 24,483 253 1.04 12,526 -3.71 0.1778
2022-02-02 2021-12-31 13F DEXCOM COM 252131107 24,230 557 2.35 13,009 0.49 0.1725
2021-11-12 2021-09-30 13F DEXCOM COM 252131107 23,673 519 2.24 12,946 30.93 0.1841
2021-08-03 2021-06-30 13F DEXCOM COM 252131107 23,154 3,766 19.42 9,888 41.91 0.1408
2021-05-17 2021-03-31 13F DEXCOM COM 252131107 19,388 602 3.20 6,968 0.33 0.1080
2021-02-11 2020-12-31 13F DEXCOM COM 252131107 18,786 211 1.14 6,945 -9.30 0.1160
2020-11-13 2020-09-30 13F DEXCOM COM 252131107 18,575 615 3.42 7,657 5.18 0.1487
2020-08-11 2020-06-30 13F DEXCOM COM 252131107 17,960 150 0.84 7,280 51.82 0.1502
2020-05-08 2020-03-31 13F DEXCOM COM 252131107 17,810 132 0.75 4,795 24.00 0.1178
2020-02-07 2019-12-31 13F DEXCOM COM 252131107 17,678 351 2.03 3,867 49.59 0.0817
2019-10-31 2019-09-30 13F DEXCOM COM 252131107 17,327 444 2.63 2,585 2.17 0.0574
2019-08-09 2019-06-30 13F DEXCOM COM 252131107 16,883 -233 -1.36 2,530 24.08 0.0559
2019-04-24 2019-03-31 13F DEXCOM COM 252131107 17,116 17,016 17,016.00 2,039 16,891.67 0.0458
2019-01-30 2018-12-31 13F DEXCOM COM 252131107 100 100 12 0.0003
2018-05-09 2018-03-31 13F DEXCOM COM 252131107 0 -5,409 -100.00 0 -100.00
2018-02-07 2017-12-31 13F DEXCOM COM 252131107 5,409 0 0.00 265 0.00 0.0070
2017-11-14 2017-09-30 13F DEXCOM COM 252131107 5,409 -19,185 -78.01 265 -85.27 0.0069
2017-08-09 2017-06-30 13F DEXCOM COM 252131107 24,594 -145 -0.59 1,799 -14.17 0.0497
2017-05-15 2017-03-31 13F DEXCOM COM 252131107 24,739 24,739 2,096 0.0597
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.