CERTIFICATIONS PURSUANT TO SECTION 302
EX-99.CERT

                                 CERTIFICATIONS

I, R. Jay Gerken, certify that:

1.    I have reviewed this report on Form N-CSR of Institutional Portfolio -
      Prime Cash Reserves Portfolio (formerly Institutional Reserves Portfolio);

2.    Based on my knowledge, this report does not contain any untrue statement
      of a material fact or omit to state a material fact necessary to make the
      statements made, in light of the circumstances under which such statements
      were made, not misleading with respect to the period covered by this
      report;

3.    Based on my knowledge, the financial statements, and other financial
      information included in this report, fairly present in all material
      respects the financial condition, results of operations, changes in net
      assets, and cash flows (if the financial statements are required to
      include a statement of cash flows) of the registrant as of, and for, the
      periods presented in this report;

4.    The registrant's other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in Rule 30a-3(c) under the Investment Company Act of 1940) for the
      registrant and have:

      a)    Designed such disclosure controls and procedures, or caused such
            disclosure controls and procedures to be designed under our
            supervision, to ensure that material information relating to the
            registrant, including its consolidated subsidiaries, is made known
            to us by others within those entities, particularly during the
            period in which this report is being prepared;

      b)    Evaluated the effectiveness of the registrant's disclosure controls
            and procedures and presented in this report our conclusions about
            the effectiveness of the disclosure controls and procedures, as of a
            date within 90 days prior to the filing date of this report based on
            such evaluation; and

      c)    Disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's most recent fiscal half-year (the registrant's second
            fiscal half-year in the case of an annual report) that has
            materially affected, or is reasonably likely to materially affect,
            the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officers and I have disclosed to the
      registrant's auditors and the audit committee of the registrant's board of
      directors (or persons performing the equivalent functions):

      a)    All significant deficiencies and material weaknesses in the design
            or operation of internal control over financial reporting which are
            reasonably likely to adversely affect the registrant's ability to
            record, process, summarize, and report financial data; and

      b)    Any fraud, whether or not material, that involves management or
            other employees who have a significant role in the registrant's
            internal control over financial reporting.

Date:  May 5, 2004                                       /s/ R. Jay Gerken
      ------------------------------                     -----------------------
                                                         R. Jay Gerken
                                                         Chief Executive Officer



I, Andrew B. Shoup, certify that:

1.    I have reviewed this report on Form N-CSR of Institutional Portfolio
      -Prime Cash Reserves Portfolio (formerly Institutional Reserves
      Portfolio);

2.    Based on my knowledge, this report does not contain any untrue statement
      of a material fact or omit to state a material fact necessary to make the
      statements made, in light of the circumstances under which such statements
      were made, not misleading with respect to the period covered by this
      report;

3.    Based on my knowledge, the financial information included in this report,
      and the financial statements on which the financial information is based,
      fairly present in all material respects the financial condition, results
      of operations, changes in net assets, and cash flows (if the financial
      statements are required to include a statement of cash flows) of the
      registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officers and I are responsible for
      establishing and maintaining disclosure controls and procedures (as
      defined in rule 30a-3(c) under the Investment Company Act) for the
      registrant and have:

      a)    Designed such disclosure controls and procedures, or caused such
            disclosure controls and procedures to be designed under our
            supervision, to ensure that material information relating to the
            registrant, including its consolidated subsidiaries, is made known
            to us by others within those entities, particularly during the
            period in which this report is being prepared;

      b)    Evaluated the effectiveness of the registrant's disclosure controls
            and procedures and presented in this report our conclusions about
            the effectiveness of the disclosure controls and procedures, as of a
            date within 90 days prior to the filing date of this report based on
            such evaluation; and

      c)    Disclosed in this report any change in the registrant's internal
            control over financial reporting that occurred during the
            registrant's most recent fiscal half-year (the registrant's second
            fiscal half-year in the case of an annual report) that has
            materially affected, or is reasonably likely to materially affect,
            the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officers and I have disclosed to the
      registrant's auditors and the audit committee of the registrant's board of
      directors (or persons performing the equivalent functions):

      a)    All significant deficiencies and material weaknesses in the design
            or operation of internal control over financial reporting which are
            reasonably likely to adversely affect the registrant's ability to
            record, process, summarize, and report financial data; and

      b)    Any fraud, whether or not material, that involves management or
            other employees who have a significant role in the registrant's
            internal control over financial reporting.

Date:  May 5, 2004                                   /s/ Andrew B. Shoup
      ----------------------------                  ----------------------------
                                                    Andrew B. Shoup
                                                    Chief Administrative Officer





CERTIFICATIONS PURSUANT TO SECTION 302
EX-99.CERT

                                 CERTIFICATIONS

I, R. Jay Gerken, certify that:

1.    I have  reviewed  this report on Form N-CSR of  Institutional  Portfolio -
      Institutional Enhanced Portfolio);

2.    Based on my knowledge,  this report does not contain any untrue  statement
      of a material fact or omit to state a material fact  necessary to make the
      statements made, in light of the circumstances under which such statements
      were made,  not  misleading  with  respect  to the period  covered by this
      report;

3.    Based on my  knowledge,  the  financial  statements,  and other  financial
      information  included  in this  report,  fairly  present  in all  material
      respects the financial  condition,  results of operations,  changes in net
      assets,  and cash  flows (if the  financial  statements  are  required  to
      include a statement of cash flows) of the  registrant  as of, and for, the
      periods presented in this report;

4.    The  registrant's  other  certifying  officers and I are  responsible  for
      establishing  and  maintaining  disclosure  controls  and  procedures  (as
      defined in Rule 30a-3(c) under the Investment Company Act of 1940) for the
      registrant and have:

      a)    Designed such  disclosure  controls and  procedures,  or caused such
            disclosure   controls  and  procedures  to  be  designed  under  our
            supervision,  to ensure that  material  information  relating to the
            registrant,  including its consolidated subsidiaries,  is made known
            to us by others  within  those  entities,  particularly  during  the
            period in which this report is being prepared;

      b)    Evaluated the effectiveness of the registrant's  disclosure controls
            and  procedures and presented in this report our  conclusions  about
            the effectiveness of the disclosure controls and procedures, as of a
            date within 90 days prior to the filing date of this report based on
            such evaluation; and

      c)    Disclosed  in this  report any change in the  registrant's  internal
            control  over   financial   reporting   that  occurred   during  the
            registrant's most recent fiscal half-year (the  registrant's  second
            fiscal  half-year  in  the  case  of  an  annual  report)  that  has
            materially  affected,  or is reasonably likely to materially affect,
            the registrant's internal control over financial reporting; and

5.    The  registrant's  other  certifying  officers and I have disclosed to the
      registrant's auditors and the audit committee of the registrant's board of
      directors (or persons performing the equivalent functions):

      a)    All significant  deficiencies and material  weaknesses in the design
            or operation of internal control over financial  reporting which are
            reasonably  likely to adversely affect the  registrant's  ability to
            record, process, summarize, and report financial data; and

      b)    Any fraud,  whether or not  material,  that  involves  management or
            other  employees  who have a  significant  role in the  registrant's
            internal control over financial reporting.



Date:  May 5, 2004                             /s/ R. Jay Gerken
      ------------------------------     ---------------------------------------
                                         R. Jay Gerken
                                         Chief Executive Officer



I, Andrew B. Shoup, certify that:

1.    I have  reviewed  this  report on Form  N-CSR of  Institutional  Portfolio
      -Institutional Enhanced Portfolio);

2.    Based on my knowledge,  this report does not contain any untrue  statement
      of a material fact or omit to state a material fact  necessary to make the
      statements made, in light of the circumstances under which such statements
      were made,  not  misleading  with  respect  to the period  covered by this
      report;

3.    Based on my knowledge,  the financial information included in this report,
      and the financial statements on which the financial  information is based,
      fairly present in all material respects the financial  condition,  results
      of  operations,  changes in net assets,  and cash flows (if the  financial
      statements  are  required  to include a  statement  of cash  flows) of the
      registrant as of, and for, the periods presented in this report;

4.    The  registrant's  other  certifying  officers and I are  responsible  for
      establishing  and  maintaining  disclosure  controls  and  procedures  (as
      defined  in rule  30a-3(c)  under  the  Investment  Company  Act)  for the
      registrant and have:

      a)    Designed such  disclosure  controls and  procedures,  or caused such
            disclosure   controls  and  procedures  to  be  designed  under  our
            supervision,  to ensure that  material  information  relating to the
            registrant,  including its consolidated subsidiaries,  is made known
            to us by others  within  those  entities,  particularly  during  the
            period in which this report is being prepared;

      b)    Evaluated the effectiveness of the registrant's  disclosure controls
            and  procedures and presented in this report our  conclusions  about
            the effectiveness of the disclosure controls and procedures, as of a
            date within 90 days prior to the filing date of this report based on
            such evaluation; and

      c)    Disclosed  in this  report any change in the  registrant's  internal
            control  over   financial   reporting   that  occurred   during  the
            registrant's most recent fiscal half-year (the  registrant's  second
            fiscal  half-year  in  the  case  of  an  annual  report)  that  has
            materially  affected,  or is reasonably likely to materially affect,
            the registrant's internal control over financial reporting; and

5.    The  registrant's  other  certifying  officers and I have disclosed to the
      registrant's auditors and the audit committee of the registrant's board of
      directors (or persons performing the equivalent functions):

      a)    All significant  deficiencies and material  weaknesses in the design
            or operation of internal control over financial  reporting which are
            reasonably  likely to adversely affect the  registrant's  ability to
            record, process, summarize, and report financial data; and

      b)    Any fraud,  whether or not  material,  that  involves  management or
            other  employees  who have a  significant  role in the  registrant's
            internal control over financial reporting.





Date:  May 5, 2004                          /s/ Andrew B. Shoup
      ----------------------------       --------------------------------------
                                         Andrew B. Shoup
                                         Chief Administrative Officer