Company:  OPPENHEIMER PORTFOLIO SER ...
Form Type:  N-CSR
Filing Date:  4/5/2019 
CIK:  0001307792 
Address:  6803 SOUTH TUCSON WAY 
City, State, Zip:  CENTENNIAL, Colorado 80112-3924 
Telephone:  303-768-3200 
Fiscal Year:  01/31 
Register and access this filing in:     
  FORM N-CSR
    Item 1. Reports to Stockholders.
      FINANCIAL STATEMENTS
        ASSETS AND LIABILITIES
      FUND PERFORMANCE
      FUND PERFORMANCE
      FUND PERFORMANCE
      PORTFOLIO OF INVESTMENTS
      PORTFOLIO OF INVESTMENTS
      FINANCIAL STATEMENTS
        ASSETS AND LIABILITIES
        STATEMENT OF CHANGES IN NET ASSETS
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        NOTES TO FINANCIAL STATEMENTSJanuary 31, 2019
        ASSETS AND LIABILITIES
      FUND PERFORMANCE
      REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
      TRUSTEES AND OFFICERS Unaudited
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        ASSETS AND LIABILITIES
      FUND PERFORMANCE
      FUND PERFORMANCE
      PORTFOLIO OF INVESTMENTS
      PORTFOLIO OF INVESTMENTS
      FINANCIAL STATEMENTS
        ASSETS AND LIABILITIES
        STATEMENT OF CHANGES IN NET ASSETS
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        NOTES TO FINANCIAL STATEMENTSJanuary 31, 2019
      FUND PERFORMANCE
      REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
      TRUSTEES AND OFFICERS Unaudited
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        ASSETS AND LIABILITIES
      FUND PERFORMANCE
      FUND PERFORMANCE
      FUND PERFORMANCE
      PORTFOLIO OF INVESTMENTS
      PORTFOLIO OF INVESTMENTS
      FINANCIAL STATEMENTS
        ASSETS AND LIABILITIES
        STATEMENT OF CHANGES IN NET ASSETS
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        NOTES TO FINANCIAL STATEMENTS January 31, 2019
        ASSETS AND LIABILITIES
      FUND PERFORMANCE
      REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
      Opinion on the Financial Statements
      TRUSTEES AND OFFICERS Unaudited
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        ASSETS AND LIABILITIES
      FUND PERFORMANCE
      FUND PERFORMANCE
      FUND PERFORMANCE
      PORTFOLIO OF INVESTMENTS
      FINANCIAL STATEMENTS
        ASSETS AND LIABILITIES
        STATEMENT OF CHANGES IN NET ASSETS
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        FINANCIAL HIGHLIGHTS TABLE
        NOTES TO FINANCIAL STATEMENTSJanuary 31, 2019
      FUND PERFORMANCE
      REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
      TRUSTEES AND OFFICERS Unaudited
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
        NAME AND TITLE
    Item 2. Code of Ethics.
    Item 3. Audit Committee Financial Expert.
    Item 4. Principal Accountant Fees and Services.
    Item 5. Audit Committee of Listed Registrants
    Item 7. Disclosure of Proxy Voting Policies and Procedures ...
    Item 11. Controls and Procedures.
    SIGNATURES
  EXHIBIT 99.CODE ETH
  EXHIBIT 99.CERT
  EXHIBIT 99.906CERT