DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionCalamos Advisors LLC
Latest Disclosed Ownership97,019 shares
Latest Disclosed Value $ 6,092,793
Calamos Advisors LLC ownership in DXCM / DexCom, Inc.

On May 4, 2026 - Calamos Advisors LLC filed a 13F-HR form disclosing ownership of 97,019 shares of DexCom, Inc. (MX:DXCM) valued at $6,092,793 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 29, 2026 disclosing 97,019 shares of DexCom, Inc.. This represents a change in shares of 0.00% 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)
2026-05-04 2026-03-31 13F DEXCOM COM 252131107 97,019 0 0.00 6,093 -5.39 0.0215
2026-01-29 2025-12-31 13F DEXCOM COM 252131107 97,019 -3,940 -3.90 6,439 -5.21 0.0242
2025-10-20 2025-09-30 13F DEXCOM COM 252131107 100,959 0 0.00 6,794 -22.91 0.0251
2025-08-08 2025-06-30 13F DEXCOM COM 252131107 100,959 0 0.00 8,813 27.82 0.0347
2025-04-29 2025-03-31 13F DEXCOM COM 252131107 100,959 -74,548 -42.48 6,894 -49.49 0.0300
2025-01-24 2024-12-31 13F DEXCOM COM 252131107 175,507 411 0.23 13,649 16.28 0.0571
2024-11-07 2024-09-30 13F DEXCOM COM 252131107 175,096 -150,829 -46.28 11,738 -68.24 0.0508
2024-07-25 2024-06-30 13F DEXCOM COM 252131107 325,925 42,050 14.81 36,953 -6.15 0.1641
2024-05-08 2024-03-31 13F DEXCOM COM 252131107 283,875 9,012 3.28 39,373 15.44 0.1865
2024-01-31 2023-12-31 13F DEXCOM COM 252131107 274,863 -15,932 -5.48 34,108 25.71 0.1654
2023-10-26 2023-09-30 13F DEXCOM COM 252131107 290,795 370 0.13 27,131 -27.31 0.1410
2023-07-28 2023-06-30 13F DEXCOM COM 252131107 290,425 35,766 14.04 37,323 26.15 0.1847
2023-05-04 2023-03-31 13F DEXCOM COM 252131107 254,659 -14,207 -5.28 29,586 -2.82 0.1445
2023-01-26 2022-12-31 13F DEXCOM COM 252131107 268,866 123,607 85.09 30,446 160.24 0.1428
2022-10-24 2022-09-30 13F DEXCOM COM 252131107 145,259 29,295 25.26 11,699 35.36 0.0535
2022-08-01 2022-06-30 13F DEXCOM COM 252131107 115,964 65,207 128.47 8,643 -66.72 0.0373
2022-05-03 2022-03-31 13F DEXCOM COM 252131107 50,757 6,815 15.51 25,967 10.05 0.0975
2022-02-01 2021-12-31 13F DEXCOM COM 252131107 43,942 -1,024 -2.28 23,595 -4.05 0.0882
2021-10-26 2021-09-30 13F DEXCOM COM 252131107 44,966 -3,524 -7.27 24,590 18.76 0.1074
2021-07-22 2021-06-30 13F DEXCOM COM 252131107 48,490 -136 -0.28 20,705 18.48 0.0946
2021-04-12 2021-03-31 13F DEXCOM COM 252131107 48,626 10,612 27.92 17,476 24.34 0.0953
2021-01-27 2020-12-31 13F DEXCOM COM 252131107 38,014 -12 -0.03 14,055 -10.33 0.0816
2020-10-26 2020-09-30 13F DEXCOM COM 252131107 38,026 35,469 1,387.13 15,675 1,411.57 0.1009
2020-07-27 2020-06-30 13F DEXCOM COM 252131107 2,557 1,604 168.31 1,037 303.50 0.0073
2020-04-28 2020-03-31 13F DEXCOM COM 252131107 953 -22 -2.26 257 20.66 0.0020
2020-01-15 2019-12-31 13F DEXCOM COMMON STOCK 252131107 975 -552 -36.15 213 -6.58 0.0011
2019-10-21 2019-09-30 13F DEXCOM COMMON STOCK 252131107 1,527 1,527 56.62 228 7.04 0.0012
2019-08-07 2019-06-30 13F DEXCOM COMMON STOCK 252131107 0 -2,060 -100.00 0 -100.00
2019-04-12 2019-03-31 13F DEXCOM COMMON STOCK 252131107 2,060 60 3.00 245 2.08 0.0015
2019-01-24 2018-12-31 13F DEXCOM COMMON STOCK 252131107 2,000 2,000 -2.91 240 -2.04 0.0016
2017-02-06 2016-12-31 13F DEXCOM COMMON STOCK 252131107 0 -209,080 -100.00 0 -100.00
2016-11-14 2016-09-30 13F DEXCOM COMMON STOCK 252131107 209,080 -77,870 -27.14 18,328 -19.49 0.1310
2016-07-26 2016-06-30 13F DEXCOM COMMON STOCK 252131107 286,950 286,950 37.24 22,764 24.20 0.1597
2013-11-14 2013-09-30 13F DEXCOM COMMON STOCK 252131107 0 -14,800 -100.00 0 -100.00
2013-08-12 2013-06-30 13F DEXCOM COMMON STOCK 252131107 14,800 14,800 332 0.0022
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.