DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionJoel Isaacson & Co., LLC
Latest Disclosed Ownership8,260 shares
Latest Disclosed Value $ 518,728
Joel Isaacson & Co., LLC reports 4.62% decrease in ownership of DXCM / DexCom, Inc.

On April 22, 2026 - Joel Isaacson & Co., LLC filed a 13F-HR form disclosing ownership of 8,260 shares of DexCom, Inc. (MX:DXCM) valued at $518,728 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 30, 2026 disclosing 8,660 shares of DexCom, Inc.. This represents a change in shares of -4.62% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-22 2026-03-31 13F DEXCOM COM 252131107 8,260 -400 -4.62 519 -9.76 0.0172
2026-01-30 2025-12-31 13F DEXCOM COM 252131107 8,660 0 0.00 575 -1.37 0.0190
2025-10-30 2025-09-30 13F DEXCOM COM 252131107 8,660 0 0.00 583 -22.91 0.0210
2025-07-23 2025-06-30 13F DEXCOM COM 252131107 8,660 0 0.00 756 27.75 0.0307
2025-04-25 2025-03-31 13F DEXCOM COM 252131107 8,660 0 0.00 591 -12.18 0.0268
2025-01-28 2024-12-31 13F DEXCOM COM 252131107 8,660 0 0.00 673 16.03 0.0304
2024-10-23 2024-09-30 13F DEXCOM COM 252131107 8,660 0 0.00 581 -40.88 0.0277
2024-07-24 2024-06-30 13F DEXCOM COM 252131107 8,660 0 0.00 982 -18.32 0.0516
2024-04-30 2024-03-31 13F DEXCOM COM 252131107 8,660 0 0.00 1,201 11.82 0.0658
2024-02-12 2023-12-31 13F/A-1 DEXCOM COM 252131107 8,660 0 0.00 1,075 33.09 0.0660
2024-01-25 2023-12-31 13F DEXCOM COM 252131107 8,660 0 1,075 0.0660
2023-10-24 2023-09-30 13F DEXCOM COM 252131107 8,660 0 0.00 808 -27.43 0.0553
2023-07-27 2023-06-30 13F DEXCOM COM 252131107 8,660 -225 -2.53 1,113 7.75 0.0745
2023-04-25 2023-03-31 13F DEXCOM COM 252131107 8,885 0 0.00 1,032 2.58 0.0742
2023-01-27 2022-12-31 13F DEXCOM COM 252131107 8,885 2,085 30.66 1,006 83.58 0.0774
2022-10-14 2022-09-30 13F DEXCOM COM 252131107 6,800 0 0.00 548 8.09 0.0473
2022-07-15 2022-06-30 13F DEXCOM COM 252131107 6,800 5,100 300.00 507 -37.94 0.0426
2022-04-21 2022-03-31 13F DEXCOM COM 252131107 1,700 -6 -0.35 817 -10.81 0.0601
2022-01-19 2021-12-31 13F DEXCOM COM 252131107 1,706 6 0.35 916 -1.51 0.0629
2021-10-21 2021-09-30 13F DEXCOM COM 252131107 1,700 0 0.00 930 28.10 0.0702
2021-07-20 2021-06-30 13F DEXCOM COM 252131107 1,700 -850 -33.33 726 -20.74 0.0565
2021-04-23 2021-03-31 13F DEXCOM COM 252131107 2,550 0 0.00 916 -2.86 0.0803
2021-01-22 2020-12-31 13F DEXCOM COM 252131107 2,550 -500 -16.39 943 -24.98 0.0923
2020-10-14 2020-09-30 13F DEXCOM COM 252131107 3,050 0 0.00 1,257 1.70 0.1634
2020-07-21 2020-06-30 13F DEXCOM COM 252131107 3,050 -3,950 -56.43 1,236 -34.43 0.1760
2020-04-21 2020-03-31 13F DEXCOM COM 252131107 7,000 0 0.00 1,885 23.12 0.3282
2020-01-24 2019-12-31 13F DEXCOM COM 252131107 7,000 -800 -10.26 1,531 31.53 0.2011
2019-10-15 2019-09-30 13F DEXCOM COM 252131107 7,800 1,300 20.00 1,164 19.51 0.1658
2019-07-11 2019-06-30 13F DEXCOM COM 252131107 6,500 -2 -0.03 974 25.84 0.1418
2019-04-09 2019-03-31 13F DEXCOM COM 252131107 6,502 0 0.00 774 -15.59 0.1129
2019-01-18 2018-12-31 13F DEXCOM COM 252131107 6,502 2 0.03 917 -1.40 0.1453
2018-10-19 2018-09-30 13F DEXCOM COM 252131107 6,500 0 0.00 930 50.73 0.1462
2018-08-01 2018-06-30 13F DEXCOM COM 252131107 6,500 0 0.00 617 28.01 0.1033
2018-05-01 2018-03-31 13F DEXCOM COM 252131107 6,500 2,000 44.44 482 86.82 0.0841
2018-01-30 2017-12-31 13F DEXCOM COM 252131107 4,500 0 0.00 258 17.27 0.0448
2017-11-02 2017-09-30 13F DEXCOM COM 252131107 4,500 0 0.00 220 -33.13 0.0403
2017-08-01 2017-06-30 13F DEXCOM COM 252131107 4,500 4,500 0.00 329 49.55 0.0622
2017-05-05 2017-03-31 13F DEXCOM COM 252131107 0 -500 -100.00 0 -100.00
2017-01-23 2016-12-31 13F DEXCOM COM 252131107 500 0 0.00 30 -31.82 0.0060
2016-10-25 2016-09-30 13F DEXCOM COM 252131107 500 0 0.00 44 10.00 0.0090
2016-07-22 2016-06-30 13F DEXCOM COM 252131107 500 -100 -16.67 40 -2.44 0.0085
2016-04-18 2016-03-31 13F DEXCOM COM 252131107 600 100 20.00 41 0.00 0.0091
2016-01-15 2015-12-31 13F DEXCOM COM 252131107 500 200 66.67 41 57.69 0.0101
2015-10-21 2015-09-30 13F DEXCOM COM 252131107 300 0 0.00 26 8.33 0.0069
2015-07-27 2015-06-30 13F DEXCOM COM 252131107 300 0 0.00 24 26.32 0.0062
2015-04-14 2015-03-31 13F DEXCOM INC ** PENDING ENLISTMENT **-- BEST EFFO COM 252131107 300 0 0.00 19 11.76 0.0048
2015-01-09 2014-12-31 13F DEXCOM INC ** PENDING ENLISTMENT **-- BEST EFFO COM 252131107 300 300 17 0.0046
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.