DexCom, Inc.
MX ˙ BMV ˙ US2521311074
SecurityMX:DXCM / DexCom, Inc.
InstitutionWellington Management Group Llp
Latest Disclosed Ownership3,805,226 shares
Ownership 4.31%
Wellington Management Group Llp ownership in DXCM / DexCom, Inc.

2018-08-10 - Wellington Management Group Llp has filed an SC 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 3,805,226 shares of DexCom, Inc. (MX:DXCM). This represents 4.31 percent ownership of the company. In their previous filing dated 2018-02-08 , Wellington Management Group Llp had reported owning 8,320,596 shares, indicating a decrease of -54.27 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2018-08-10 2018-08-10 13G/A 8,320,596 3,805,226 -54.27 4.31 -54.96
2018-02-08 2018-02-08 13G/A 8,730,998 8,320,596 -4.70 9.57 -4.78
2017-12-11 2017-12-11 13G 1,756,975 8,730,998 396.93 10.05 365.28
2016-02-11 2016-02-11 13G/A 1,756,975 1,756,975 0.00 2.16
2015-02-12 2015-02-12 13G/A 5,311,595 6.94
2014-02-14 2014-02-14 13G 4,148,356 5.78

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 9,326,240 6,252,665 203.43 585,688 187.11 0.0155
2026-02-17 2025-12-31 13F DEXCOM COM 252131107 3,073,575 2,994,303 3,777.25 203,993 3,724.39 0.0357
2025-11-14 2025-09-30 13F DEXCOM COM 252131107 79,272 -238,292 -75.04 5,334 -80.76 0.0009
2025-08-14 2025-06-30 13F DEXCOM COM 252131107 317,564 -406,412 -56.14 27,720 -43.93 0.0050
2025-05-13 2025-03-31 13F DEXCOM COM 252131107 723,976 698,135 2,701.66 49,440 2,360.93 0.0095
2025-02-12 2024-12-31 13F DEXCOM COM 252131107 25,841 -5,672,673 -99.55 2,010 -99.47 0.0004
2024-11-14 2024-09-30 13F DEXCOM COM 252131107 5,698,514 367,056 6.88 382,028 -36.80 0.0669
2024-08-14 2024-06-30 13F DEXCOM COM 252131107 5,331,458 560,565 11.75 604,481 -8.65 0.1079
2024-05-15 2024-03-31 13F DEXCOM COM 252131107 4,770,893 1,007,931 26.79 661,723 41.71 0.1172
2024-02-12 2023-12-31 13F DEXCOM COM 252131107 3,762,962 -679,638 -15.30 466,946 12.65 0.0872
2023-11-14 2023-09-30 13F DEXCOM COM 252131107 4,442,600 -511,219 -10.32 414,495 -34.89 0.0831
2023-08-14 2023-06-30 13F DEXCOM COM 252131107 4,953,819 768,128 18.35 636,615 30.91 0.1207
2023-05-12 2023-03-31 13F DEXCOM COM 252131107 4,185,691 -141,424 -3.27 486,294 -0.76 0.0964
2023-02-13 2022-12-31 13F DEXCOM COM 252131107 4,327,115 -4,719,894 -52.17 490,003 -32.75 0.0983
2022-11-14 2022-09-30 13F DEXCOM COM 252131107 9,047,009 3,297,715 57.36 728,646 70.05 0.1552
2022-08-15 2022-06-30 13F DEXCOM COM 252131107 5,749,294 4,649,846 422.93 428,496 -23.82 0.0863
2022-05-16 2022-03-31 13F DEXCOM COM 252131107 1,099,448 587,855 114.91 562,477 104.76 0.0963
2022-02-11 2021-12-31 13F DEXCOM COM 252131107 511,593 -472,219 -48.00 274,699 -48.94 0.0439
2021-11-15 2021-09-30 13F DEXCOM COM 252131107 983,812 -121,570 -11.00 538,007 13.98 0.0915
2021-08-16 2021-06-30 13F DEXCOM COM 252131107 1,105,382 -35,344 -3.10 471,999 15.13 0.0786
2021-05-17 2021-03-31 13F DEXCOM COM 252131107 1,140,726 -13,179 -1.14 409,965 -3.90 0.0722
2021-02-12 2020-12-31 13F DEXCOM COM 252131107 1,153,905 393,832 51.82 426,622 36.16 0.0786
2020-11-16 2020-09-30 13F DEXCOM COM 252131107 760,073 -119,028 -13.54 313,325 -12.08 0.0649
2020-08-14 2020-06-30 13F DEXCOM COM 252131107 879,101 -699,007 -44.29 356,388 -16.13 0.0794
2020-05-14 2020-03-31 13F DEXCOM COM 252131107 1,578,108 36,470 2.37 424,938 26.01 0.1125
2020-02-11 2019-12-31 13F DEXCOM COM 252131107 1,541,638 577,643 59.92 337,219 134.40 0.0707
2019-11-13 2019-09-30 13F DEXCOM COM 252131107 963,995 -133,594 -12.17 143,866 -12.52 0.0324
2019-08-14 2019-06-30 13F DEXCOM COM 252131107 1,097,589 -66,980 -5.75 164,463 18.57 0.0364
2019-05-15 2019-03-31 13F DEXCOM COM 252131107 1,164,569 -1,580,697 -57.58 138,700 -57.83 0.0314
2019-02-14 2018-12-31 13F DEXCOM COM 252131107 2,745,266 -672,000 -19.66 328,882 -32.72 0.0823
2018-11-14 2018-09-30 13F DEXCOM COM 252131107 3,417,266 -634,613 -15.66 488,806 27.01 0.1029
2018-08-14 2018-06-30 13F DEXCOM COM 252131107 4,051,879 -2,459,278 -37.77 384,849 -20.30 0.0857
2018-05-15 2018-03-31 13F DEXCOM COM 252131107 6,511,157 -1,809,439 -21.75 482,867 1.12 0.1093
2018-02-13 2017-12-31 13F DEXCOM COM 252131107 8,320,596 350,047 4.39 477,520 22.45 0.1055
2017-11-13 2017-09-30 13F DEXCOM COM 252131107 7,970,549 6,473,513 432.42 389,960 256.10 0.0895
2017-08-14 2017-06-30 13F DEXCOM COM 252131107 1,497,036 -254,143 -14.51 109,508 -26.20 0.0258
2017-05-11 2017-03-31 13F DEXCOM COM 252131107 1,751,179 -783,851 -30.92 148,377 -1.96 0.0357
2017-02-14 2016-12-31 13F DEXCOM COM 252131107 2,535,030 -2,039,105 -44.58 151,342 -62.26 0.0380
2016-11-14 2016-09-30 13F DEXCOM COM 252131107 4,574,135 -735,935 -13.86 400,968 -4.81 0.1004
2016-08-15 2016-06-30 13F DEXCOM COM 252131107 5,310,070 -437,483 -7.61 421,249 7.93 0.1089
2016-05-13 2016-03-31 13F DEXCOM COM 252131107 5,747,553 3,990,578 227.13 390,316 171.25 0.1027
2016-02-12 2015-12-31 13F DEXCOM COM 252131107 1,756,975 -6,599 -0.37 143,895 -4.97 0.0376
2015-11-16 2015-09-30 13F DEXCOM COM 252131107 1,763,574 -2,209,279 -55.61 151,420 -52.35 0.0422
2015-08-14 2015-06-30 13F DEXCOM COM 252131107 3,972,853 -512,611 -11.43 317,750 13.64 0.0820
2015-05-15 2015-03-31 13F DEXCOM COM 252131107 4,485,464 -826,131 -15.55 279,623 -4.37 0.0719
2015-02-13 2014-12-31 13F DEXCOM COM 252131107 5,311,595 239,891 4.73 292,404 44.17 0.0773
2014-11-14 2014-09-30 13F DEXCOM COM 252131107 5,071,704 -262,900 -4.93 202,818 -4.14 0.0559
2014-08-14 2014-06-30 13F DEXCOM COM 252131107 5,334,604 1,697,721 46.68 211,570 40.65 0.0569
2014-05-15 2014-03-31 13F DEXCOMINC COM 252131107 3,636,883 -511,473 -12.33 150,422 2.40 0.0418
2014-02-14 2013-12-31 13F DEXCOM COM 252131107 4,148,356 -202,119 -4.65 146,893 19.61 0.0422
2013-11-14 2013-09-30 13F DEXCOM COM 252131107 4,350,475 1,004,224 30.01 122,813 63.48 0.0385
2013-08-14 2013-06-30 13F DEXCOM COM 252131107 3,346,251 3,346,251 75,123 0.0245
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.