-----BEGIN PRIVACY-ENHANCED MESSAGE----- Proc-Type: 2001,MIC-CLEAR Originator-Name: webmaster@www.sec.gov Originator-Key-Asymmetric: MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB MIC-Info: RSA-MD5,RSA, WIFR8rh7/TaAyp+0X2hhCSh1WUOQbMQyKqr7hGzLUdTb+nepux7HnmLrCswJ66Si Es7Pbedo4+JtzQoPw3deFQ== 0000950135-07-000122.txt : 20070111 0000950135-07-000122.hdr.sgml : 20070111 20070111140248 ACCESSION NUMBER: 0000950135-07-000122 CONFORMED SUBMISSION TYPE: SC 13G PUBLIC DOCUMENT COUNT: 1 FILED AS OF DATE: 20070111 DATE AS OF CHANGE: 20070111 SUBJECT COMPANY: COMPANY DATA: COMPANY CONFORMED NAME: DEXCOM INC CENTRAL INDEX KEY: 0001093557 STANDARD INDUSTRIAL CLASSIFICATION: SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841] IRS NUMBER: 000000000 FILING VALUES: FORM TYPE: SC 13G SEC ACT: 1934 Act SEC FILE NUMBER: 005-81357 FILM NUMBER: 07525472 BUSINESS ADDRESS: STREET 1: 5555 OBERLIN DRIVE CITY: SAN DIEGO STATE: CA ZIP: 92121 BUSINESS PHONE: 8582000200 MAIL ADDRESS: STREET 1: 5555 OBERLIN DRIVE CITY: SAN DIEGO STATE: CA ZIP: 92121 FILED BY: COMPANY DATA: COMPANY CONFORMED NAME: FRONTIER CAPITAL MANAGEMENT CO LLC CENTRAL INDEX KEY: 0001216488 IRS NUMBER: 043492668 STATE OF INCORPORATION: DE FILING VALUES: FORM TYPE: SC 13G BUSINESS ADDRESS: STREET 1: 99 SUMMER STREET CITY: BOSTON STATE: MA ZIP: 02110 SC 13G 1 b63574disc13g.txt FRONTIER CAPITAL MANAGEMENT OMB APPROVAL OMB Number:3235-0145 Expires: August 31, 1999 Estimated average burden hours per form 14.90 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. *) DEXCOM INC (Name of Issuer) COMMON STOCK (Title of Class of Securities) 252131107 (CUSIP Number) DECEMBER 31, 2006 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [_X_] Rule 13d-1(b) [___] Rule 13d-1(c) [___] Rule 13d-1(d) * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number. SEC 1745 (3-98) Page 1 of 4 pages Page 1 CUSIP No. Page 2 of 4 Pages 252131107 - -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS IRS IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY) FRONTIER CAPITAL MANAGEMENT CO., LLC. - -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) [ ] (b) [ ] - -------------------------------------------------------------------------------- 3 SEC USE ONLY - -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION DELAWARE - -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER 1,601,800 SHARES BENEFICIALLY ---------------------------------------------------- OWNED BY 6 SHARED VOTING POWER EACH REPORTING ---------------------------------------------------- PERSON 7 SOLE DISPOSITIVE POWER 1,601,800 WITH ---------------------------------------------------- 8 SHARED DISPOSITIVE POWER - -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,601,800 - -------------------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) - -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 5.700% - -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (See Instructions) IA - -------------------------------------------------------------------------------- Page 2 CUSIP No. 13G Page 3 of 4 Pages 252131107 ITEM 1. (a) Name of Issuer: DEXCOM INC (b) Address of Issuer's Principal Executive Offices: 5555 OBERLIN DRIVE SAN DIEGO, CA 92121 ITEM 2. (a) Name of Person Filing: FRONTIER CAPITAL MANAGEMENT LLC. (b) Address of Principal Business Office: 99 SUMMER STREET, BOSTON, MA 02110 (c) Citizenship: DELAWARE (d) Title of Class of Securities: COMMON STOCKS (e) CUSIP Number: 252131107 ITEM 3. If this statement is filed pursuant to rule 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: (a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o). (b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c). (c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c). (d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8). (e) [X] An investment adviser in accordance with 240.13d-1(b)(1)(ii)(E). (f) [ ] An employee benefit plan or endowment fund in accordance with 240.13d-1(b)(1)(ii)(F). (g) [ ] A parent holding company or control person in accordance with 240.13d-1(b)(1)(ii)(G) (h) [ ] A savings association as defined in section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813). (i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3). (j) [ ] Group, in accordance with section 240.13d-1(b)(1)(ii)(J) Page 3 CUSIP No. 13G Page 4 of 4 Pages 252131107 ITEM 4. OWNERSHIP (a) Amount Beneficially Owned: 1,601,800 (b) Percent of Class: 5.700% (c) Number of Shares as to which such person has: 1,601,800 ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [___]. ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP ITEM 9. NOTICE OF DISSOLUTION OF GROUP ITEM 10. CERTIFICATION By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. DATED: By: /s/ William J. Ballou JANUARY 2, 2007 ------------------------------------ Name: William J. Ballou Title: CHIEF OPERATING OFFICER Page 4 -----END PRIVACY-ENHANCED MESSAGE-----