DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionRafferty Asset Management, LLC
Latest Disclosed Ownership199,829 shares
Latest Disclosed Value $ 12,549,261
Rafferty Asset Management, LLC reports 12.23% decrease in ownership of DXCM / DexCom, Inc.

On May 15, 2026 - Rafferty Asset Management, LLC filed a 13F-HR form disclosing ownership of 199,829 shares of DexCom, Inc. (MX:DXCM) valued at $12,549,261 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 227,669 shares of DexCom, Inc.. This represents a change in shares of -12.23% 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)
2026-05-15 2026-03-31 13F DEXCOM COM 252131107 199,829 -27,840 -12.23 12,549 -16.95 0.0509
2026-02-13 2025-12-31 13F DEXCOM COM 252131107 227,669 2,636 1.17 15,110 -0.21 0.0522
2025-11-12 2025-09-30 13F DEXCOM COM 252131107 225,033 36,347 19.26 15,142 -8.06 0.0491
2025-08-14 2025-06-30 13F DEXCOM COM 252131107 188,686 -19,553 -9.39 16,470 15.82 0.0543
2025-05-14 2025-03-31 13F DEXCOM COM 252131107 208,239 3,380 1.65 14,221 -10.74 0.0606
2025-02-14 2024-12-31 13F DEXCOM COM 252131107 204,859 -2,427 -1.17 15,932 14.64 0.0564
2024-11-13 2024-09-30 13F DEXCOM COM 252131107 207,286 57,508 38.40 13,896 -18.17 0.0476
2024-08-13 2024-06-30 13F DEXCOM COM 252131107 149,778 14,548 10.76 16,982 -9.46 0.0630
2024-05-13 2024-03-31 13F DEXCOM COM 252131107 135,230 7,641 5.99 18,756 18.47 0.0700
2024-02-13 2023-12-31 13F DEXCOM COM 252131107 127,589 -387 -0.30 15,833 32.60 0.0668
2023-11-13 2023-09-30 13F DEXCOM COM 252131107 127,976 32,941 34.66 11,940 -2.23 0.0702
2023-08-11 2023-06-30 13F DEXCOM COM 252131107 95,035 10,084 11.87 12,213 23.74 0.0689
2023-05-11 2023-03-31 13F DEXCOM COM 252131107 84,951 9,255 12.23 9,870 15.14 0.0669
2023-02-13 2022-12-31 13F DEXCOM COM 252131107 75,696 -26,424 -25.88 8,572 4.21 0.0718
2022-11-14 2022-09-30 13F DEXCOM COM 252131107 102,120 -6,384 -5.88 8,225 1.71 0.0875
2022-08-12 2022-06-30 13F DEXCOM COM 252131107 108,504 90,246 494.28 8,087 -13.42 0.0744
2022-05-13 2022-03-31 13F DEXCOM COM 252131107 18,258 7,580 70.99 9,341 62.91 0.0554
2022-02-10 2021-12-31 13F DEXCOM COM 252131107 10,678 -1,257 -10.53 5,734 -12.15 0.0302
2021-11-10 2021-09-30 13F DEXCOM COM 252131107 11,935 1,185 11.02 6,527 42.20 0.0446
2021-08-10 2021-06-30 13F DEXCOM COM 252131107 10,750 -1,387 -11.43 4,590 5.23 0.0289
2021-05-10 2021-03-31 13F DEXCOM COM 252131107 12,137 222 1.86 4,362 -0.98 0.0298
2021-02-10 2020-12-31 13F DEXCOM COM 252131107 11,915 3,047 34.36 4,405 20.49 0.0430
2020-11-13 2020-09-30 13F DEXCOM COM 252131107 8,868 -74 -0.83 3,656 0.86 0.0442
2020-08-07 2020-06-30 13F DEXCOM COM 252131107 8,942 8,942 3,625 0.0511
2020-05-15 2020-03-31 13F DEXCOM COM 252131107 0 -1,623 -100.00 0 -100.00
2020-02-10 2019-12-31 13F DEXCOM COM 252131107 1,623 -863 -34.71 355 -4.31 0.0055
2019-11-14 2019-09-30 13F DEXCOM COM 252131107 2,486 -1,619 -39.44 371 -39.67 0.0058
2019-08-09 2019-06-30 13F DEXCOM COM 252131107 4,105 4,105 615 0.0108
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.