DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionRenaissance Technologies Llc
ManagerJames Simons
Latest Disclosed Ownership1,582,996 shares
Latest Disclosed Value $ 99,412,149
Renaissance Technologies Llc reports 9.57% increase in ownership of DXCM / DexCom, Inc.

On May 14, 2026 - Renaissance Technologies Llc filed a 13F-HR form disclosing ownership of 1,582,996 shares of DexCom, Inc. (MX:DXCM) valued at $99,412,149 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,444,796 shares of DexCom, Inc.. This represents a change in shares of 9.57% 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)
2026-05-14 2026-03-31 13F DEXCOM COM 252131107 1,582,996 138,200 9.57 99,412 3.67 0.1555
2026-02-12 2025-12-31 13F DEXCOM COM 252131107 1,444,796 603,232 71.68 95,891 69.33 0.1488
2025-11-13 2025-09-30 13F DEXCOM COM 252131107 841,564 143,762 20.60 56,629 -7.03 0.0748
2025-08-13 2025-06-30 13F DEXCOM COM 252131107 697,802 67,028 10.63 60,911 41.41 0.0810
2025-05-14 2025-03-31 13F DEXCOM COM 252131107 630,774 -259,100 -29.12 43,076 -37.76 0.0652
2025-02-13 2024-12-31 13F DEXCOM COM 252131107 889,874 58,902 7.09 69,206 24.23 0.1024
2024-11-13 2024-09-30 13F DEXCOM COM 252131107 830,972 368,400 79.64 55,708 6.22 0.0838
2024-08-09 2024-06-30 13F DEXCOM COM 252131107 462,572 -385,100 -45.43 52,446 44,725.64 0.0890
2024-05-13 2024-03-31 13F DEXCOM COM 252131107 847,672 844,972 31,295.26 118 0.1848
2024-02-13 2023-12-31 13F DEXCOM COM 252131107 2,700 2,700 0 0.0005
2023-11-14 2023-09-30 13F DEXCOM COM 252131107 0 -168,600 -100.00 0 -100.00
2023-08-11 2023-06-30 13F DEXCOM COM 252131107 168,600 -121,600 -41.90 22 -36.36 0.0312
2023-05-12 2023-03-31 13F DEXCOM COM 252131107 290,200 212,900 275.42 34 312.50 0.0447
2023-02-13 2022-12-31 13F DEXCOM COM 252131107 77,300 71,400 1,210.17 9 -98.32 0.0120
2022-11-14 2022-09-30 13F DEXCOM COM 252131107 5,900 -888,672 -99.34 475 -99.29 0.0007
2022-08-12 2022-06-30 13F DEXCOM COM 252131107 894,572 871,372 3,755.91 66,672 461.73 0.0789
2022-05-13 2022-03-31 13F DEXCOM COM 252131107 23,200 -116,743 -83.42 11,869 -84.20 0.0139
2022-02-11 2021-12-31 13F DEXCOM COM 252131107 139,943 139,943 75,142 0.0935
2021-08-13 2021-06-30 13F DEXCOM COM 252131107 0 -144,043 -100.00 0 -100.00
2021-05-13 2021-03-31 13F DEXCOM COM 252131107 144,043 -140,966 -49.46 51,768 -50.87 0.0644
2021-02-10 2020-12-31 13F DEXCOM COM 252131107 285,009 -446,967 -61.06 105,374 -65.08 0.1144
2020-11-13 2020-09-30 13F DEXCOM COM 252131107 731,976 -451,100 -38.13 301,742 -37.09 0.3013
2020-08-13 2020-06-30 13F DEXCOM COM 252131107 1,183,076 233,747 24.62 479,619 87.63 0.4140
2020-05-14 2020-03-31 13F DEXCOM COM 252131107 949,329 249,086 35.57 255,626 66.89 0.2483
2020-02-13 2019-12-31 13F DEXCOM COM 252131107 700,243 644,843 1,163.98 153,171 1,752.58 0.1177
2019-11-13 2019-09-30 13F DEXCOM COM 252131107 55,400 -245,543 -81.59 8,268 -81.66 0.0070
2019-08-12 2019-06-30 13F DEXCOM COM 252131107 300,943 -961,198 -76.16 45,093 -70.00 0.0397
2019-05-14 2019-03-31 13F DEXCOM COM 252131107 1,262,141 287,553 29.51 150,321 28.75 0.1367
2019-02-12 2018-12-31 13F DEXCOM COM 252131107 974,588 391,529 67.15 116,756 39.99 0.1278
2018-11-13 2018-09-30 13F DEXCOM COM 252131107 583,059 191,916 49.07 83,401 124.49 0.0857
2018-08-13 2018-06-30 13F/A-1 DEXCOM COM 252131107 391,143 230,200 143.03 37,151 211.25 0.0405
2018-08-13 2018-06-30 13F DEXCOM COM 252131107 160,943 11,936
2018-05-14 2018-03-31 13F DEXCOM COM 252131107 160,943 -134,200 -45.47 11,936 -52.27 0.0131
2017-05-12 2017-03-31 13F DEXCOM COM 252131107 295,143 157,500 114.43 25,007 204.33 0.0349
2017-02-13 2016-12-31 13F DEXCOM COM 252131107 137,643 137,643 -53.36 8,217 -67.14 0.0130
2016-11-14 2016-09-30 13F DEXCOM COM 252131107 0 -341,806 -100.00 0 -100.00
2016-08-12 2016-06-30 13F DEXCOM COM 252131107 341,806 -476,137 -58.21 27,115 -51.19 0.0516
2016-05-13 2016-03-31 13F DEXCOM COM 252131107 817,943 124,000 17.87 55,547 -2.26 0.1056
2016-02-11 2015-12-31 13F DEXCOM COM 252131107 693,943 557,300 407.85 56,834 384.44 0.1238
2015-11-12 2015-09-30 13F DEXCOM COM 252131107 136,643 109,743 407.97 11,732 445.42 0.0280
2015-08-14 2015-06-30 13F DEXCOM COM 252131107 26,900 -42,443 -61.21 2,151 -50.24 0.0049
2015-05-13 2015-03-31 13F DEXCOM COM 252131107 69,343 -200,000 -74.25 4,323 -70.84 0.0092
2015-02-13 2014-12-31 13F DEXCOM COM 252131107 269,343 -111,500 -29.28 14,827 -5.87 0.0358
2014-05-14 2014-03-31 13F DEXCOM COM 252131107 380,843 -176,700 -31.69 15,752 -20.21 0.0378
2014-02-14 2013-12-31 13F DEXCOM COM 252131107 557,543 350,200 168.90 19,743 237.43 0.0473
2013-11-13 2013-09-30 13F DEXCOM COM 252131107 207,343 90,200 77.00 5,851 122.47 0.0142
2013-08-12 2013-06-30 13F DEXCOM COM 252131107 117,143 117,143 2,630 0.0069
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.