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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1)*

DexCom, Inc.
(Name of Issuer)
Common Stock, $.0001 par value
(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:

     o Rule 13d-1(b)

     o Rule 13d-1(c)

     þ 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 the disclosures provided in a prior cover page.

The information required in 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).

 
 

 

                     
CUSIP No.
  
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   Page  
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   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Canaan Equity II L.P.
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Partnership
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

                     
CUSIP No.
  
252131107 
   Page  
3 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Canaan Equity II L.P. (QP)
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Partnership
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  PN

 

                     
CUSIP No.
  
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   Page  
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   of   
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1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Canaan Equity II Entrepreneurs LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Liability Company
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

                     
CUSIP No.
  
252131107 
   Page  
5 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Canaan Equity Partners II LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Liability Company
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

                     
CUSIP No.
  
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   Page  
6 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Stephen L. Green
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
252131107 
   Page  
7 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Deepak Kamra
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
252131107 
   Page  
8 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Gregory Kopchinsky
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
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   Page  
9 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Guy M. Russo
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
252131107 
   Page  
10 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    John V. Balen
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
252131107 
   Page  
11 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Eric A. Young
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  United States
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  IN

 

                     
CUSIP No.
  
252131107 
   Page  
12 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Charmers Landing LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Liability Company
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

                     
CUSIP No.
  
252131107 
   Page  
13 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Stonehenge LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Liability Company
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

                     
CUSIP No.
  
252131107 
   Page  
14 
   of   
25

 

           
1   NAMES OF REPORTING PERSONS:
   
  I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY): 
    Waubeeka LLC
     
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS):
  (a)   o
  (b)   þ
     
3   SEC USE ONLY:
   
   
     
4   CITIZENSHIP OR PLACE OF ORGANIZATION:
   
  Delaware Limited Liability Company
       
  5   SOLE VOTING POWER:
     
NUMBER OF   0
       
SHARES 6   SHARED VOTING POWER:
BENEFICIALLY    
OWNED BY   See Item 5.
       
EACH 7   SOLE DISPOSITIVE POWER:
REPORTING    
PERSON   0
       
WITH: 8   SHARED DISPOSITIVE POWER:
     
    See Item 5.
     
9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON:
   
  See Item 5.
     
10   CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS):
   
  o
     
11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9):
   
  See Item 5.
     
12   TYPE OF REPORTING PERSON (SEE INSTRUCTIONS):
   
  OO

 

                     
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   Page  
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   of   
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Item 1(a).   Name of Issuer
DexCom, Inc.
Item 1(b).   Address of Issuer’s Principal Executive Offices
5555 Oberlin Drive
San Diego, CA 92121
Item 2(a).   Name of Person Filing
This statement is filed by (i) Canaan Equity II L.P. (“CE II”), a Delaware limited partnership, (ii) Canaan Equity II L.P. (QP) (“CE II QP”), a Delaware limited partnership, (iii) Canaan Equity II Entrepreneurs, LLC (“Entrepreneurs”), a Delaware limited liability company, (iv) Canaan Equity Partners II LLC (“CEP II”), a Delaware limited liability company and the general partner of CE II and CE II QP and the manager of Entrepreneurs, (v) John V. Balen, (vi) Stephen L. Green, (vii) Deepak Kamra, (viii) Gregory Kopchinsky, (ix) Guy M. Russo, (x) Eric A. Young, (xi) Charmers Landing LLC (“Charmers”), a Delaware limited liability company, (xii) Stonehenge LLC (“Stonehenge”), a Delaware limited liability company, and (xiii) Waubeeka LLC (“Waubeeka”) a Delaware limited liability company. The sole managers of Charmers, Stonehenge, and Waubeeka are Messrs. Green, Kopchinsky and Russo, respectively. We refer to the individuals and entities identified in (i)-(xiii) above collectively as the “Reporting Persons.”
Item 2(b).   Address of Principal Business Office or, if None, Residence
Except in the case of Messrs. Balen, Kamra and Young, the principal business address of the Reporting Persons is 285 Riverside Avenue, Suite 205, Westport, CT 06880. The principal business address of Messrs. Balen, Kamra and Young is 2765 Sand Hill Road, Menlo Park, CA 94025.
Item 2(c).   Citizenship
Each of CE II and CE II QP is a limited partnership organized under the laws of Delaware. Each of Entrepreneurs, CEP II, Charmers, Stonehenge and Waubeeka is a limited liability company organized under the laws of Delaware. Each of the individuals named above is a citizen of the United States.
Item 2(d).   Title of Class of Securities
This Schedule 13G report relates to the Common Stock, par value $0.01 per share (“Common Stock”), of DexCom, Inc.
Item 2(e).   CUSIP Number
CUSIP number 252131107
Item 3.   If this statement is filed pursuant to §§240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
  (a)   o Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).
 
  (b)   o Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).
 
  (c)   o Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).
 
  (d)   o Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).
 
  (e)   o An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

 

                     
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  (f)   o An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);
 
  (g)   o A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
 
  (h)   o A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
 
  (i)   o 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)   o Group, in accordance with §240.13d-1(b)(1)(ii)(J).
None.
Item 4.   Ownership
(a)   Amount Beneficially Owned
 
    See Item 5.
 
(b)   Percent of Class:
 
    Each Reporting Person: %.
         
CE II
  See Item 5.    
CE II QP
  See Item 5.    
Entrepreneurs
  See Item 5.    
CEP II
  See Item 5.    
 
John V. Balen
  See Item 5.    
Stephen L. Green
  See Item 5.    
Deepak Kamra
  See Item 5.    
Gregory Kopchinsky
  See Item 5.    
Guy M. Russo
  See Item 5.    
Eric A. Young
  See Item 5.    
Charmers
  See Item 5.    
Stonehenge
  See Item 5.    
Waubeeka
  See Item 5.    

 

                     
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(c)   Number of shares to which such person has:
 
(i)   Sole power to vote or direct the vote
 
(ii)   Shared power to vote or to direct the vote
 
(iii)   Sole power to dispose or to direct the disposition of
 
(iv)   Shared power to dispose or to direct the disposition of
None.
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 þ.
Item 6.   Ownership of More than Five Percent on Behalf of Another Person
 
    Not applicable.
Item 7.   Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company
 
  Not applicable.
Item 8.   Identification and Classification of Members of the Group
 
    Each of the Reporting Persons expressly disclaims membership in a “Group” as defined in Rule 13d-1 (b) (1) (ii) (J).
Item 9.   Notice of Dissolution of Group
 
    Not applicable.
Item 10.   Certification
 
    Not applicable. This Schedule 13G is not filed pursuant to Rule 13d-1(b) or Rule 13d-1(c).

 

                     
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SIGNATURES
After reasonable inquiry and to the best of the undersigned’s knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.
Dated: February 13, 2007
                 
    Canaan Equity II L.P.        
 
                
    By:   Canaan Equity Partners II LLC    
 
      Its General Partner        
 
                
 
  By:   *        
             
 
      Manager        
 
                
    Canaan Equity II L.P. (QP)
    
 
                
    By:   Canaan Equity Partners II LLC    
 
      Its General Partner        
 
                
 
  By:   *        
             
 
      Manager        
 
                
    Canaan Equity II Entrepreneurs LLC.
    
 
                
 
  By:   Canaan Equity Partners II LLC        
 
      Its Manager        
 
                
 
  By:   *        
 
               
 
      Manager        
 
                
    Canaan Equity Partners II LLC
    
 
                
 
  By:   *        
             
 
      Manager        
 
                
 
      *        
         
    John V. Balen        
 
                
 
      *        
         
    Stephen L. Green        
 
                
 
      *        
         
    Deepak Kamra        
 
                
 
      *        
         
    Gregory Kopchinsky        

 

                     
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  /s/ Guy M. Russo    
  Guy M. Russo   
     
  *    
  Eric A. Young   
       
  Charmers Landing LLC
 		  
  By:   *    
    Manager   
       
  Stonehenge LLC
 		  
  By:   *    
    Manager   
       
  Waubeeka LLC
 		  
  By:   /s/ Guy M. Russo    
    Manager   
       
 
 
  
 
  * By: /s/ Guy M. Russo    
    Guy M. Russo   
    Attorney-in-Fact   
         
  This Amendment No. 1 to Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney, copies of which are filed herewith as Exhibit 2.
 
     

 

 

                     
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Exhibit 1
Joint Filing Agreement
In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned agree that only one statement containing the information required by Schedule 13G need be filed by each of the undersigned with respect to the ownership by each of the undersigned of shares of stock of DexCom, Inc. This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.
Executed as of February 1, 2006
         
  Canaan Equity II L.P.

By:   Canaan Equity Partners II LLC
         Its General Partner
 		  
  By:   *    
    Manager   
       
  Canaan Equity II L.P. (QP)

By:   Canaan Equity Partners II LLC
         Its General Partner
 		  
  By:   *    
    Manager   
       
  Canaan Equity II Entrepreneurs LLC

By:   Canaan Equity Partners II LLC
         Its Manager
 		  
  By:   *    
    Manager   
       
  Canaan Equity Partners II LLC
 		  
  By:   *    
    Manager   
       
  *    
  John V. Balen   
       
  *    
  James C. Furnivall   
       
  *    
  Stephen L. Green   
       
  *    
  Deepak Kamra   
       

 

 

                     
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  *    
 
       
 
  Gregory Kopchinsky    
         
 
  /s/ Guy M. Russo    
 
       
 
  Guy M. Russo    
         
 
  *    
 
       
 
  Eric A. Young    
 
        
 
  Charmers Landing LLC    
             
 
  By:   *    
 
     
 
    
 
      Manager    
             
    Stonehenge LLC    
 
            
 
  By:   *    
 
     
 
Manager 		   
 
            
    Waubeeka LLC    
             
 
  By:   /s/ Guy M. Russo    
 
     
 
Manager 		   
             
 
 
 
    
 
 
  * By:   /s/ Guy M. Russo    
 
     
 
Guy M. Russo 		   
 
      Attorney-in-Fact    
 
            
    This Joint Filing Agreement was executed by Guy M. Russo pursuant to Powers of Attorney, copies of which are filed herewith as Exhibit 2.

 

 

                     
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Exhibit 2
POWER OF ATTORNEY
     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Guy M. Russo his true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for him and in his name, place and stead, in any and all capacities (until revoked in writing) to sign any and all instruments, certificates and documents required to be executed on behalf of himself as an individual or in his capacity as a general partner or authorized signatory, as the case may be, on behalf of any of Canaan Equity II L.P., Canaan Equity II L.P. (QP), Canaan Equity II Entrepreneurs LLC and Canaan Equity Partners II LLC pursuant to the Securities Act of 1933, as amended, (the “Securities Act”), or the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and any and all regulations promulgated thereunder and to file the same, with all exhibits thereto, and any other documents in connection therewith, with the Securities and Exchange Commission, and with any other entity when and if such is mandated by the Securities Act, the Exchange Act or by the By-laws of the National Association of Securities Dealers, Inc., granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary fully to all intents and purposes as he might or could do in person thereby, and ratifying and confirming all that said attorney-in-fact and agent, or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof, or may have done in connection with the matters described above.
[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

 

 

                     
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     IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 14th day of February, 2001.
             
    CANAAN EQUITY II L.P.    
 
            
 
  By:   Canaan Equity Partners II LLC    
 
      Its General Partner    
 
            
 
  By:   /s/ Harry T. Rein    
 
           
 
      Member/Manager    
 
            
    CANAAN EQUITY II L.P. (QP)    
 
            
 
  By:   Canaan Equity Partners II LLC    
 
      Its General Partner    
 
            
 
  By:   /s/ Harry T. Rein    
 
           
 
      Member/Manager    
 
            
    CANAAN EQUITY II ENTREPRENEURS LLC
 
            
 
  By:   Canaan Equity Partners II LLC    
 
      Its General Partner    
 
            
 
  By:   /s/ Harry T. Rein    
 
           
 
      Member/Manager    
 
            
    CANAAN EQUITY PARTNERS II LLC    
 
            
 
  By:   /s/ Harry T. Rein    
 
           
 
      Member/Manager    
 
            
    /s/ Harry T. Rein    
         
    Harry T. Rein    
 
            
    /s/ John V. Balen    
         
    John V. Balen    
 
            
    /s/ James C. Furnivall    
         
    James C. Furnivall    
 
            
    /s/ Stephen L. Green    
         
    Stephen L. Green    
 
            
    /s/ Deepak Kamra    
         
    Deepak Kamra    
 
            
    /s/ Guy M. Russo    
         
    Guy M. Russo    

 

                     
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   /s/ Gregory Kopchinsky
 
Gregory Kopchinsky 		     
 
        
 
   /s/ Eric A. Young
 
Eric A. Young 		     

 

 

                     
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Exhibit 2
POWER OF ATTORNEY
     KNOW ALL MEN BY THESE PRESENTS, that each entity whose signature appears below hereby constitutes and appoints Guy M. Russo its true and lawful attorney-in-fact and agent, with full power of substitution and resubstitution, for such entity in its name, place and stead, in any and all capacities (until revoked in writing) to sign any and all instruments, certificates and documents required to be executed on behalf of such entity, as applicable pursuant to the Securities Act of 1933, as amended, (the “Securities Act”), or the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and any and all regulations promulgated thereunder and to file the same, with all exhibits thereto, and any other documents in connection therewith, with the Securities and Exchange Commission, and with any other entity when and if such is mandated by the Securities Act, the Exchange Act or by the By-laws of the National Association of Securities Dealers, Inc., granting unto said attorney-in-fact and agent full power and authority to do and perform each and every act and thing requisite and necessary fully to all intents and purposes as he might or could do in person thereby, and ratifying and confirming all that said attorney-in-fact and agent, or his substitute or substitutes, may lawfully do or cause to be done by virtue hereof, or may have done in connection with the matters described above.
IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 11th day of February, 2005.
             
    CHARMERS LANDING LLC    
 
            
 
  By:        /s/ Stephen L. Green
 
      Manager 		     
 
            
    STONEHENGE LLC    
 
            
 
  By:        /s/ Gregory Kopchinsky
 
     Manager