DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership772,557 shares
Latest Disclosed Value $ 48,516,489
Rhumbline Advisers reports 0.41% decrease in ownership of DXCM / DexCom, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 772,557 shares of DexCom, Inc. (MX:DXCM) valued at $48,516,489 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 775,751 shares of DexCom, Inc.. This represents a change in shares of -0.41% 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 COM COM 252131107 772,557 -3,194 -0.41 48,516 -5.77 0.0415
2026-02-13 2025-12-31 13F DEXCOM INC COM COM 252131107 775,751 -24,806 -3.10 51,486 -4.42 0.0416
2025-11-06 2025-09-30 13F DEXCOM INC COM COM 252131107 800,557 -9,731 -1.20 53,869 -23.84 0.0433
2025-08-12 2025-06-30 13F DEXCOM INC COM COM 252131107 810,288 485 0.06 70,730 27.90 0.0606
2025-05-29 2025-03-31 13F/A-1 DEXCOM INC COM COM 252131107 809,803 33,574 4.33 55,301 -8.39 0.0517
2025-04-08 2025-03-31 13F DEXCOM INC COM COM 252131107 809,803 33,574 55,301 0.0517
2025-05-29 2024-12-31 13F/A-1 DEXCOM INC COM COM 252131107 776,229 -29,434 -3.65 60,367 11.77 0.0540
2025-01-30 2024-12-31 13F DEXCOM INC COM COM 252131107 776,229 -29,434 60,367 0.0540
2024-11-12 2024-09-30 13F DEXCOM INC COM COM 252131107 805,663 306 0.04 54,012 -40.85 0.0487
2024-08-01 2024-06-30 13F DEXCOM INC COM COM 252131107 805,357 17,817 2.26 91,311 -16.41 0.0858
2024-05-09 2024-03-31 13F DEXCOM INC COM COM 252131107 787,540 9,661 1.24 109,232 13.16 0.1049
2024-02-08 2023-12-31 13F DEXCOM INC COM COM 252131107 777,879 -11,376 -1.44 96,527 31.08 0.1012
2023-11-09 2023-09-30 13F DEXCOM INC COM COM 252131107 789,255 133 0.02 73,637 -27.39 0.0855
2023-08-08 2023-06-30 13F DEXCOM INC COM COM 252131107 789,122 5,267 0.67 101,410 111,339.56 0.1136
2023-05-11 2023-03-31 13F DEXCOM INC COM COM 252131107 783,855 47,461 6.45 91 -99.89 0.1124
2023-02-14 2022-12-31 13F DEXCOM INC COM COM 252131107 736,394 15,818 2.20 83,389 43.69 0.1121
2022-11-10 2022-09-30 13F DEXCOM INC COM COM 252131107 720,576 12,062 1.70 58,035 9.90 0.0865
2022-08-11 2022-06-30 13F DEXCOM INC COM COM 252131107 708,514 541,883 325.20 52,806 -38.06 0.0771
2022-05-12 2022-03-31 13F DEXCOM INC COM COM 252131107 166,631 -242 -0.15 85,248 -4.86 0.1097
2022-02-10 2021-12-31 13F DEXCOM INC COM COM 252131107 166,873 825 0.50 89,602 -1.32 0.1098
2021-11-12 2021-09-30 13F DEXCOM INC COM COM 252131107 166,048 -623 -0.37 90,805 27.59 0.1229
2021-08-05 2021-06-30 13F DEXCOM INC COM COM 252131107 166,671 -1,275 -0.76 71,169 17.91 0.0934
2021-05-06 2021-03-31 13F DEXCOM INC COM COM 252131107 167,946 -6,636 -3.80 60,358 -6.49 0.0820
2021-02-10 2020-12-31 13F DEXCOM INC COM COM 252131107 174,582 1,113 0.64 64,546 -9.74 0.0891
2020-11-12 2020-09-30 13F DEXCOM INC COM COM 252131107 173,469 2,517 1.47 71,509 3.18 0.1121
2020-08-13 2020-06-30 13F DEXCOM INC COM COM 252131107 170,952 75,433 78.97 69,304 169.46 0.1157
2020-05-06 2020-03-31 13F DEXCOM INC COM COM 252131107 95,519 -1,697 -1.75 25,720 20.95 0.0539
2020-02-05 2019-12-31 13F DEXCOM INC COM COM 252131107 97,216 2,052 2.16 21,265 49.73 0.0356
2019-10-23 2019-09-30 13F DEXCOM INC COM COM 252131107 95,164 -825 -0.86 14,202 -1.26 0.0260
2019-08-14 2019-06-30 13F DEXCOM INC COM COM 252131107 95,989 -3,607 -3.62 14,383 21.25 0.0270
2019-05-01 2019-03-31 13F DEXCOM INC COM COM 252131107 99,596 -1,576 -1.56 11,862 -2.13 0.0230
2019-01-31 2018-12-31 13F DEXCOM INC COM COM 252131107 101,172 -188 -0.19 12,120 -16.41 0.0264
2018-11-07 2018-09-30 13F DEXCOM INC COM COM 252131107 101,360 190 0.19 14,499 50.89 0.0280
2018-08-06 2018-06-30 13F DEXCOM INC COM COM 252131107 101,170 2,317 2.34 9,609 31.07 0.0194
2018-05-02 2018-03-31 13F DEXCOM INC COM COM 252131107 98,853 -2,908 -2.86 7,331 25.53 0.0153
2018-02-09 2017-12-31 13F DEXCOM INC COM COM 252131107 101,761 -1,868 -1.80 5,840 15.19 0.0119
2017-11-06 2017-09-30 13F DEXCOM INC COM COM 252131107 103,629 -3,561 -3.32 5,070 -35.34 0.0110
2017-08-02 2017-06-30 13F DEXCOM INC COM COM 252131107 107,190 173 0.16 7,841 -13.53 0.0179
2017-05-02 2017-03-31 13F DEXCOM INC COM COM 252131107 107,017 3,158 3.04 9,068 46.26 0.0212
2017-01-27 2016-12-31 13F DEXCOM INC COM COM 252131107 103,859 4,715 4.76 6,200 -28.66 0.0157
2016-11-08 2016-09-30 13F DEXCOM INC COM COM 252131107 99,144 4,633 4.90 8,691 15.91 0.0239
2016-08-11 2016-06-30 13F DEXCOM INC COM COM 252131107 94,511 7,767 8.95 7,498 27.28 0.0222
2016-05-02 2016-03-31 13F DEXCOM INC USD.00 COM 252131107 86,744 -2,100 -2.36 5,891 -19.04 0.0183
2016-02-03 2015-12-31 13F DEXCOM INC USD.00 COM 252131107 88,844 480 0.54 7,276 -4.10 0.0234
2015-11-04 2015-09-30 13F DEXCOM INC USD.00 COM 252131107 88,364 3,370 3.96 7,587 11.61 0.0258
2015-08-04 2015-06-30 13F DEXCOM INC USD.00 COM 252131107 84,994 -2,721 -3.10 6,798 24.32 0.0217
2015-05-12 2015-03-31 13F DEXCOM INC USD.00 COM 252131107 87,715 11,585 15.22 5,468 30.47 0.0158
2015-02-06 2014-12-31 13F DEXCOM INC USD.00 COM 252131107 76,130 -1,365 -1.76 4,191 35.24 0.0122
2014-11-12 2014-09-30 13F DEXCOM INC USD.00 COM 252131107 77,495 -2,330 -2.92 3,099 -2.12 0.0093
2014-08-06 2014-06-30 13F DEXCOM INC USD.00 COM 252131107 79,825 2,977 3.87 3,166 -0.38 0.0093
2014-05-06 2014-03-31 13F DEXCOM INC USD.00 COM 252131107 76,848 -2,210 -2.80 3,178 13.54 0.0094
2014-02-03 2013-12-31 13F DEXCOM INC USD.00 COM 252131107 79,058 1,770 2.29 2,799 28.28 0.0083
2013-11-05 2013-09-30 13F DEXCOM INC USD.00 COM 252131107 77,288 -1,333 -1.70 2,182 23.63 0.0068
2013-08-07 2013-06-30 13F DEXCOM INC USD.00 COM 252131107 78,621 78,621 1,765 0.0057
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.