EX-99.1

Exhibit 99.1

Joint Filer Information


Name:
   St. Paul Fire and Marine Insurance Company

Address:
   385 Washington Street
   St. Paul, MN 55102

Designated Filer:
   The St. Paul Travelers Companies, Inc.

Issuer & Trading Symbol:
   Dexcom, Inc. (DXCM)

Date of Event Requiring Statement:
   4/13/2005

Signature:
   /s/ Steven L.P. Schwen
   Its:  Authorized Representative



Name:
   Split Rock Partners, LLC

Address:
   10400 Viking Drive, Suite 550
   Eden Prairie, MN 55344

Designated Filer:
   The St. Paul Travelers Companies, Inc.

Issuer & Trading Symbol:
   Dexcom, Inc. (DXCM)

Date of Event Requiring Statement:
   4/13/2005

Signature:
   /s/ Steven L.P. Schwen
   Its:  Chief Financial Officer



Name:
   St. Paul Venture Capital V, LLC

Address:
   10400 Viking Drive, Suite 550
   Eden Prairie, MN 55344

Designated Filer:
   The St. Paul Travelers Companies, Inc.

Issuer & Trading Symbol:
   Dexcom, Inc. (DXCM)

Date of Event Requiring Statement:
  4/13/2005

Signature:
   /s/ Steven L.P. Schwen
   Its:	Chief Financial Officer



Name:
   St. Paul Venture Capital VI, LLC

Address:
   10400 Viking Drive, Suite 550
   Eden Prairie, MN 55344

Designated Filer:
   The St. Paul Travelers Companies, Inc.

Issuer & Trading Symbol:
   Dexcom, Inc. (DXCM)

Date of Event Requiring Statement:
   4/13/2005

Signature:
   /s/ Steven L.P. Schwen
   Its:	Chief Financial Officer

EX-99.2

Exhibit 99.2

Footnote Disclosure

(1) Each share of Series A, Series B, Series C and Series D
Convertible Preferred Stock automatically converts into 0.5
shares of Common Stock upon the closing of the Issuers
initial public offering.  Each share of Series A, Series B,
Series C and Series D Convertible Preferred Stock is also
convertible at any time at the option of the holder.

(2) Represents securities held directly by St. Paul Venture
Capital V, LLC, which is jointly managed by Split Rock
Partners, LLC and Vesbridge Partners, LLC.  Voting and
investment power over the shares, however, has been
delegated solely to Split Rock Partners, LLC.  Split Rock
Partners, LLC has delegated voting and investment decisions
with respect to the shares to four individuals who require a
two-thirds vote to act.  St. Paul Fire and Marine Insurance
Company, a wholly owned subsidiary of The St. Paul Travelers
Companies, Inc., has the right to appoint a majority of the
members of the board of directors of St. Paul Venture Capital
V, LLC, and owns a controlling interest of St. Paul Venture
Capital V, LLC. Each of Split Rock Partners, LLC, St. Paul
Fire and Marine Insurance Company and The St. Paul Travelers
Companies, Inc. may be deemed to be an indirect beneficial
owner of the reported securities.  Each of Split Rock
Partners, LLC, St. Paul Fire and Marine Insurance Company
and The St. Paul Travelers Companies, Inc. disclaims any
beneficial ownership of the reported securities, except to
the extent of any pecuniary interest therein. This report
shall not be deemed an admission that any of the reporting
persons is the beneficial owner of such securities for
purposes of Section 16 or for any other purpose.

(3) Represents securities held directly by St. Paul Venture
Capital Affiliates Fund I, LLC, which is jointly managed by
Split Rock Partners, LLC and Vesbridge Partners, LLC. Voting
and investment power over the shares, however, has been
delegated solely to Split Rock Partners, LLC.  Split Rock
Partners, LLC has delegated voting and investment decisions
with respect to the shares to four individuals who require a
two-thirds vote to act. Split Rock Partners, LLC may be deemed
to be an indirect beneficial owner of the reported securities.
Split Rock Partners, LLC disclaims any beneficial ownership
of the reported securities, except to the extent of any
pecuniary interest therein.  This report shall not be deemed
an admission that any of the reporting persons is the
beneficial owner of such securities for purposes of Section
16 or for any other purpose.

(4) Represents securities held directly by Windamere, LLC.
Voting and investment power over the shares are generally
held by the managing member of Windamere, LLC; however,
investments or dispositions in excess of certain amounts
must be approved by the board of directors of Windamere,
LLC.  Split Rock Partners, LLC has the right to appoint a
majority of the members of the board of directors of
Windamere, LLC. St. Paul Fire and Marine Insurance Company,
a wholly owned subsidiary of The St. Paul Travelers
Companies, Inc., owns a controlling interest of Windamere,
LLC. Each of Split Rock Partners, LLC, St. Paul Fire and
Marine Insurance Company and The St. Paul Travelers Companies,
Inc. may be deemed to be an indirect beneficial owner of the
reported securities.  Each of Split Rock Partners, LLC, St.
Paul Fire and Marine Insurance Company and The St. Paul
Travelers Companies, Inc. disclaims any beneficial ownership
of the reported securities, except to the extent of any
pecuniary interest therein.  This report shall not be deemed
an admission that any of the reporting persons is the
beneficial owner of such securities for purposes of Section
16 or for any other purpose.

(5) Represents securities held directly by Fog City Fund,
LLC.  Voting and investment power over the shares are
generally held by the managing member of Fog City Fund, LLC;
however, investments or dispositions in excess of certain
amounts must be approved by the board of directors of Fog
City Fund, LLC. Split Rock Partners, LLC has the right to
appoint a majority of the members of the board of directors
of Fog City Fund, LLC.  St. Paul Fire and Marine Insurance
Company, a wholly owned subsidiary of The St. Paul Travelers
Companies, Inc., owns a controlling interest of Fog City
Fund, LLC.  Each of Split Rock Partners, LLC, St. Paul Fire
and Marine Insurance Company and The St. Paul Travelers
Companies, Inc. may be deemed to be an indirect beneficial
owner of the reported securities.  Each of Split Rock Partners,
LLC, St. Paul Fire and Marine Insurance Company and The St.
Paul Travelers Companies, Inc. disclaims any beneficial
ownership of the reported securities, except to the extent
of any pecuniary interest therein.  This report shall not be
deemed an admission that any of the reporting persons is the
beneficial owner of such securities for purposes of Section 16
or for any other purpose.

(6) Represents securities held directly by Windamere II, LLC.
Voting and investment power over the shares are generally
held by the managing member of Windamere II, LLC; however,
investments or dispositions in excess of certain amounts
must be approved by the board of directors of Windamere II,
LLC.  Split Rock Partners, LLC has the right to appoint a
majority of the members of the board of directors of Windamere
II, LLC. St. Paul Fire and Marine Insurance Company, a wholly
owned subsidiary of The St. Paul Travelers Companies, Inc.,
owns a controlling interest of Windamere II, LLC.  Each of
Split Rock Partners, LLC, St. Paul Fire and Marine Insurance
Company and The St. Paul Travelers Companies, Inc. may be
deemed to be an indirect beneficial owner of the reported
securities. Each of Split Rock Partners, LLC, St. Paul Fire
and Marine Insurance Company and The St. Paul Travelers
Companies, Inc. disclaims any beneficial ownership of the
reported securities, except to the extent of any pecuniary
interest therein.  This report shall not be deemed an
admission that any of the reporting persons is the beneficial
owner of such securities for purposes of Section 16 or for
any other purpose.

(7) Represents securities held directly by St. Paul Venture
Capital VI, LLC, which is jointly managed by Split Rock
Partners, LLC and Vesbridge Partners, LLC.  Voting and
investment power over the shares, however, has been
delegated solely to Split Rock Partners, LLC.  Split Rock
Partners, LLC has delegated voting and investment decisions
with respect to the shares to four individuals who require
a two-thirds vote to act.  St. Paul Fire and Marine Insurance
Company, a wholly owned subsidiary of The St. Paul Travelers
Companies, Inc., has the right to appoint a majority of the
members of the board of directors of St. Paul Venture Capital
VI, LLC, and owns a controlling interest of St. Paul Venture
Capital VI, LLC. Each of Split Rock Partners, LLC, St. Paul
Fire and Marine Insurance Company and The St. Paul Travelers
Companies, Inc. may be deemed to be an indirect beneficial
owner of the reported securities.  Each of Split Rock
Partners, LLC, St. Paul Fire and Marine Insurance Company
and The St. Paul Travelers Companies, Inc. disclaims any
beneficial ownership of the reported securities, except to
the extent of any pecuniary interest therein.  This report
shall not be deemed an admission that any of the reporting
persons is the beneficial owner of such securities for
purposes of Section 16 or for any other purpose.

(8) Represents securities held directly by Windamere III,
LLC.  Voting and investment power over the shares are
generally held by the managing member of Windamere III, LLC;
however, investments or dispositions in excess of certain
amounts must be approved by the board of directors of
Windamere III, LLC. Split Rock Partners, LLC has the right
to appoint a majority of the members of the board of
directors of Windamere III, LLC.  St. Paul Fire and Marine
Insurance Company, a wholly owned subsidiary of The St. Paul
Travelers Companies, Inc., owns a controlling interest of
Windamere III, LLC.  Each of Split Rock Partners, LLC,
St. Paul Fire and Marine Insurance Company and The St. Paul
Travelers Companies, Inc. may be deemed to be an indirect
beneficial owner of the reported securities. Each of Split
Rock Partners, LLC, St. Paul Fire and Marine Insurance
Company and The St. Paul Travelers Companies, Inc. disclaims
any beneficial ownership of the reported securities, except
to the extent of any pecuniary interest therein. This report
shall not be deemed an admission that any of the reporting
persons is the beneficial owner of such securities for
purposes of Section 16 or for any other purpose.