UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM N-CSR

                              CERTIFIED SHAREHOLDER
              REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

                  Investment Company Act file number: 811-10041
                             JNL Investors Series Trust
               (Exact name of registrant as specified in charter)

                       1 Corporate Way, Lansing, MI 48951
              (Address of principal executive offices) (Zip code)

                               Susan S. Rhee, Esq.
                     Jackson National Asset Management, LLC
                                1 Corporate Way
                               Lansing, MI 48951
                    (Name and address of agent for service)

Registrant's telephone number, including area code: 517 381-5500

Date of fiscal year end: October 31

Date of reporting period: April 30, 2006


Item 1. Report to Shareholders.



JNL MONEY MARKET FUND (UNAUDITED)
SCHEDULE OF INVESTMENTS (IN THOUSANDS)
April 30, 2006



                         


                                                                       Shares           Value


                                                                       Percentage of Total
   Industry Sector                                                     Investments
   Financial                                                           75.7%
   Money Market Investments                                            22.2%
   Mortgage Securities                                                   2.1%
                                                                       100.0%

Short Term Investments - 100.1%
Certificates of Deposit - 23.0%
   American Express Co., 4.87%, 06/21/06                               $6,000           $6,000
   ANZ Delaware Inc., 4.81%, 01/29/07                                  4,000            4,000
   Bank of America Corp., 5.21%, 04/19/07                              3,500            3,500
   BNP Paribas, 5.33%, 04/30/07                                        3,500            3,500
   Credit Suisse New York, 4.79%, 01/24/07                             4,000            4,000
   Deutsche Bank Securities Inc., 4.94%, 02/06/07                      3,500            3,500
   HBOS Plc, 4.81%, 12/07/06                                           3,500            3,500
   HBOS Treasury Services Plc, 4.84%, 01/30/07                         3,000            3,000
   Marshall & Ilsley Corp., 3.77%, 06/19/06                            2,800            2,795
   Royal Bank of Scotland Plc, 4.82%, 01/18/07                         2,825            2,825
   Svenska Handelsbanken, 4.81%, 12/27/06                              3,750            3,750
   Wells Fargo Co., 5.09%, 03/29/07                                    4,500            4,500
   Wilmington Trust Corp., 4.64%, 05/09/06                             5,000            5,000
                                                                                        49,870
Commercial Paper - 49.8%
   Apreco LLC, 4.75%, 05/15/06                                         4,500            4,492
   Aspen Funding Corp., 4.80%, 05/15/06                                4,600            4,591
   Cafco LLC, 4.76%, 05/15/06                                          4,600            4,591
   Cargill Global Funding Plc, 4.74%, 05/03/06                         6,000            5,998
   Clipper Receivables Corp., 4.92%, 05/26/06                          4,000            3,986
   Fairway Finance Corp., 4.77%, 05/03/06                              4,500            4,499
   Falcon Asset Securitization, 4.77%, 05/03/06                        4,500            4,499
   Galaxy Funding Inc., 4.61%, 05/08/06                                4,500            4,496
   General Electric Capital Corp., 4.63%, 05/01/06                     6,000            6,000
   GlaxoSmithKline Plc, 4.82%, 05/19/06                                6,000            5,986
   Goldman Sachs Group Inc., 4.76%, 05/10/06                           5,000            4,994
   Greyhawk Funding LLC, 4.90%, 05/22/06                               4,000            3,989
   Merrill Lynch Co. Inc., 4.83%, 05/16/06                             4,300            4,291
   Metlife Funding Inc., 4.72%, 05/05/06                               5,000            4,997
   Morgan Stanley, 4.86%, 05/10/06                                     4,500            4,495
   National Utilities Inc., 4.85%, 05/22/06                            5,000            4,986
   Northern Rock Plc, 4.84%, 05/18/06                                  6,000            5,986
   Park Avenue Bank, 4.85%, 05/18/06                                   4,500            4,490
   Thunder Bay Funding LLC, 4.94%, 05/16/06                            4,500            4,491
   Total Capital SA, 4.75%, 05/08/06                                   6,000            5,994
   UnitedHealth Group Inc., 4.77%, 05/08/06                            5,400            5,396
   Windmill Funding I Inc., 4.76%, 05/01/06                            4,500            4,500
                                                                                        107,747

Corporate Bonds - 5.1%
   Bank of America Corp., 4.80%, 05/08/06 (b)                          3,500            3,500
   Citigroup Global Markets Holdings Inc., 4.73%, 05/08/06 (b)         3,000            3,000
   Holmes Financing Plc, 4.87%, 12/15/06 (b)                           2,700            2,700
   Permanent Financing Plc, 4.82%, 03/10/07 (b) (c)                    1,770            1,770
                                                                                        10,970
Money Market Funds - 0.0%
   Dreyfus Cash Management Plus Fund, 4.71% (a)                        21               21

Repurchase Agreement - 22.2%
   Repurchase Agreement with Bank of America Securities, 4.78%
   (Collateralized by $31,193, Federal Home Loan Mortgage
   Corporation, 5.00%, due 04/01/36, market value $29,463)
   acquired on 04/28/06, due 05/01/06 at $29,012                      $29,000           29,000

   Repurchase Agreement with Morgan Stanley, 4.78%,
   (Collateralized by $21,297 Federal National Mortgage Association,
   5.00%, due 07/01/35, market value $20,124) acquired on 04/28/06,
   due 05/01/06 at $19,108                                             19,100           19,100
                                                                                        48,100

   Total Short Term Investments (cost $216,708)                                         216,708

Total Investments - 100.1% (cost $216,708)                                              216,708
Other Assets and Liabilities, Net - (0.1)%                                              (298)
Total Net Assets - 100%                                                                 $216,410




Notes to the Schedule of Investments:

(a)  Dividend yield changes daily to reflect current market conditions.  Rate is
     the quoted yield as of April 30, 2006.

(b)  Variable rate security. Rate stated is in effect as of April 30, 2006.

(c)  Rule  144A,  Section  4(2)  provides  an  exemption  from the  registration
     requirements for resale of this security to an institutional  investor. The
     Fund has deemed this security to be liquid based on procedures  approved by
     the  Board  of  Trustees.  As of April  30,  2006,  the  market  value,  in
     thousands, of 144A securities, in JNL Money Market Fund is $1,770.




JNL MONEY MARKET FUND (UNAUDITED)
FINANCIAL STATEMENTS (IN THOUSANDS, EXCEPT NET ASSET VALUE PER SHARE)


STATEMENT OF ASSETS AND LIABILITIES
APRIL 30, 2006


ASSETS

Investments in securities at amortized cost                 $ 216,708
Dividends and interest receivable                                 676
                                                    ------------------
                                                    ------------------
Total assets                                                  217,384
                                                    ------------------
                                                    ------------------

LIABILITIES
Payables:
   Advisory fees                                                   40
   Trustee fees                                                     2
   Other expenses                                                   2
   Dividends                                                      930
                                                    ------------------
                                                    ------------------
Total liabilities                                                 974
                                                    ------------------
                                                    ------------------
NET ASSETS                                                  $ 216,410
                                                    ==================
                                                    ==================

NET ASSETS CONSIST OF:
Paid-in capital                                             $ 216,410
                                                    ==================
                                                    ==================

INSTITUTIONAL CLASS:
SHARES OUTSTANDING (NO PAR VALUE),
    UNLIMITED SHARES AUTHORIZED                               216,410
                                                    ==================
                                                    ==================

NET ASSET VALUE PER SHARE                                      $ 1.00
                                                    ==================
                                                    ==================



STATEMENT OF OPERATIONS
PERIOD FROM NOVEMBER 1, 2005* TO APRIL 30, 2006


INVESTMENT INCOME

   Dividends                                        $ 1
   Interest                                       5,000
                                             -----------
                                             -----------
TOTAL INVESTMENT INCOME                           5,001
                                             -----------
                                             -----------

EXPENSES
   Advisory fees                                    223
   Trustees fees                                      3
   Other expenses                                     4
                                             -----------
                                             -----------
TOTAL EXPENSES                                      230
                                             -----------
                                             -----------
NET INVESTMENT INCOME                             4,771
                                             -----------
                                             -----------


NET INCREASE IN NET ASSETS
   FROM OPERATIONS                              $ 4,771
- -------------------------------------------- ===========
- -------------------------------------------- ===========
* Commencement of operations


                     See Notes to the Financial Statements.



JNL MONEY MARKET FUND (UNAUDITED)
FINANCIAL STATEMENTS


STATEMENT OF CHANGES IN NET ASSETS
PERIOD FROM NOVEMBER 1, 2005* TO APRIL 30, 2006
(IN THOUSANDS)

OPERATIONS
   Net investment income                                   $ 4,771
                                                  -----------------
                                                  -----------------
NET INCREASE IN NET ASSETS
   FROM OPERATIONS                                           4,771
                                                  -----------------
                                                  -----------------

DISTRIBUTIONS TO SHAREHOLDERS
   From net investment income                               (4,771)
                                                  -----------------
                                                  -----------------

SHARE TRANSACTIONS(1)
  Proceeds from the sale of shares                       2,319,177
  Cost of shares redeemed                               (2,102,767)
                                                  -----------------
                                                  -----------------
NET INCREASE IN NET ASSETS FROM
SHARE TRANSACTIONS                                         216,410
                                                  -----------------
                                                  -----------------

NET INCREASE IN NET ASSETS                                 216,410

NET ASSETS BEGINNING OF PERIOD                                   -
                                                  -----------------
                                                  -----------------

NET ASSETS END OF PERIOD                                 $ 216,410
                                                  =================
                                                  =================

UNDISTRIBUTED  NET
   INVESTMENT INCOME                                           $ -
                                                  =================
                                                  =================


(1)SHARE TRANSACTIONS
Shares sold                                              2,319,177
Shares redeemed                                         (2,102,767)
                                                  -----------------
                                                  -----------------

Net increase                                               216,410
- ------------------------------------------------  =================
- ------------------------------------------------  =================
* Commencement of operations



FINANCIAL HIGHLIGHTS
PERIOD FROM NOVEMBER 1, 2005* TO APRIL 30, 2006


NET ASSET VALUE, BEGINNING OF PERIOD                                 $ 1.00
                                                               -------------
                                                               -------------

INVESTMENT OPERATIONS
   Net investment income                                               0.02

DISTRIBUTIONS
   Net investment income                                              (0.02)
                                                               -------------
                                                               -------------

NET ASSET VALUE, END OF PERIOD                                       $ 1.00
                                                               =============
                                                               =============

RATIOS AND SUPPLEMENTAL DATA
   Total return (a)                                                   2.07%
   Net assets, end of year (in thousands)                         $ 216,410
   Ratio of net investment income to average net assets (b)           4.26%
   Ratio of expenses to average net assets (b)                        0.20%
- -------------------------------------------------------------
- -------------------------------------------------------------
* Commencement of operations
(a) The total return is not annualized for the period.
(b) This ratio is annualized for the period.


                     See Notes to the Financial Statements.



                        JNL MONEY MARKET FUND (UNAUDITED)

                  NOTES TO THE FINANCIAL STATEMENTS (CONTINUED)

                        JNL MONEY MARKET FUND (UNAUDITED)

                        NOTES TO THE FINANCIAL STATEMENTS

NOTE 1. ORGANIZATION

JNL Investors Series Trust (the "Trust") was organized under the laws of
Massachusetts, by a Declaration of Trust, dated July 28, 2000. The Trust is
registered with the Securities and Exchange Commission under the Investment
Company Act of 1940 (the "1940 Act"), as amended, and the Securities Act of
1933, as amended, as an open-end management investment company issuing its
shares in series, each series representing a distinct portfolio with its own
investment objectives and policies. The JNL Money Market Fund (the "Fund") is
presently the only series authorized. The Fund is a "diversified" series of the
Trust and is sub-advised by Wellington Management Company, LLP. The Fund
commenced operations on November 1, 2005. The Institutional Class of shares is
the only class of shares presently being offered by the Fund.

Jackson National Asset Management, LLC ("JNAM"), a wholly-owned subsidiary of
Jackson National Life Insurance Company ("Jackson National"), serves as
investment adviser to the Fund.


NOTE 2. SIGNIFICANT ACCOUNTING POLICIES

The following is a summary of significant accounting policies followed and
consistently applied by the Trust in the preparation of its financial
statements.

USE OF ESTIMATES - The preparation of financial statements in conformity with
accounting principles generally accepted in the United States of America
requires management to make estimates and assumptions that affect the reported
amounts of assets and liabilities and disclosure of contingent assets and
liabilities at the date of the financial statements and the reported amounts of
increases and decreases in net assets from operations during the reporting
period. Actual results could differ from those estimates.

GUARANTEES AND INDEMNIFICATIONS - Under the Fund's organizational documents, its
officers and Trustees are indemnified against certain liabilities arising out of
the performance of their duties to the Fund. In addition, certain of the Fund's
contracts with its service providers contain general indemnification clauses.
The Fund's maximum exposure under these arrangements is unknown since the amount
of any future claims that may be made against the Fund cannot be determined and
the Fund has no historical basis for predicting the likelihood of any such
claims.

SECURITY VALUATION - Pursuant to Rule 2a-7 of the 1940 Act, securities in money
market funds are valued at amortized cost, which approximates market value, in
order to maintain a constant net asset value of $1.00 per share. If amortized
cost no longer approximates market value due to credit or other impairments of
the issuer, the Fund will use Board approved pricing and valuation procedures to
determine a security's fair value. Money market funds must invest exclusively in
high quality securities. To be considered high quality, a security generally
must be rated in one of the two highest short-term credit quality categories by
a nationally recognized rating organization such as Standard & Poors Corporation
or Moody's Investors Service, Inc.

SECURITY TRANSACTIONS AND INVESTMENT INCOME - Security transactions are recorded
on trade date. Dividend income is recorded on ex-dividend date. Interest income,
including straight line amortization of discounts and premiums, is accrued
daily. Realized gains and losses are determined on the specific identification
basis.

REPURCHASE AGREEMENTS - The Fund may invest in repurchase agreements. A
repurchase agreement involves the purchase of a security by a Fund and a
simultaneous agreement (generally by a bank or broker-dealer) to repurchase that
security back from the Fund at a specified price and date or upon demand.
Securities pledged as collateral for repurchase agreements are held by the
Fund's custodian bank until the maturity of the repurchase agreement. Procedures
for all repurchase agreements have been designed to assure that the daily market
value of the collateral is in excess of the repurchase agreement in the event of
default.

DISTRIBUTIONS TO SHAREHOLDERS - The Fund declares dividends daily and pays
dividends monthly. Distributions of net realized capital gains, if any, will be
distributed at least annually.

FEDERAL INCOME TAXES - The Fund intends to comply with the requirements of
Subchapter M of the Internal Revenue Code necessary to qualify as a regulated
investment company and to make the requisite distributions of taxable income and
capital gains to it's shareholders sufficient to relieve it from all or
substantially all federal income or excise taxes.


NOTE 3. INVESTMENT ADVISORY FEES AND TRANSACTIONS WITH AFFILIATES

The Trust has entered into an Investment Advisory Agreement (the "Agreement")
with JNAM whereby JNAM provides investment management services to the Fund.
Under the terms of the Agreement, the Fund pays JNAM an annual fee, computed
daily and payable monthly, based on a specified percentage of the average daily
net assets of the Fund. A portion of this fee is paid by JNAM to the sub-adviser
as compensation for their services. The following is a schedule of the fees the
Fund is currently obligated to pay JNAM.

ASSETS                     FEES
$0 to $750 million         0.20%
Over $750 million          0.18%

ADMINISTRATIVE SERVICES - JNAM provides or procures most of the necessary
administrative functions and services for the operations of the Fund at no
additional cost to the Institutional class of shares. In accordance with the
Administration Agreement, JNAM is responsible for payment of expenses related to
legal, audit, fund accounting, custody, printing and mailing and other services
necessary for the operation of the Fund. The Fund is responsible for expenses
including brokerage commissions, interest and taxes, other non-operating
expenses, registration fees, Trustees and officers insurance, the fees and
expenses of the disinterested Trustees and independent legal counsel to the
disinterested Trustees and a majority of the cost associated with the Chief
Compliance Officer.

TRANSFER AGENCY SERVICES - The Trust has an agreement with JNAM whereby JNAM
provides transfer agency services for the Institutional Class of shares of the
Fund at no additional cost.


NOTE 4.  FEDERAL INCOME TAX MATTERS

As of April 30, 2006, the aggregate cost of investments and the composition of
unrealized appreciation and depreciation of investments for federal income tax
purposes are listed in the following table (in thousands).


                         

Cost of Investments   Gross Unrealized Appreciation    Gross Unrealized Depreciation    Net Unrealized Appreciation
- -------------------   -----------------------------    ------------------------------   ---------------------------

   $ 216,708                         $ -                                $ -                               $ -




The tax  character of  distributions  paid during the  semi-annual  period ended
April 30, 2006, were as follows (in thousands):

Ordinary Income
- ---------------

       $ 4,771


DISCLOSURE OF FUND EXPENSES (UNAUDITED)

The Fund is affected by ongoing costs, which include (among others) costs for
portfolio management, administrative services, and the operating expenses.

Operating expenses such as these are deducted from the Fund's gross income and
directly reduce the final investment return. These expenses are expressed as a
percentage of the Fund's average net assets; this percentage is known as the
Fund's expense ratio.

The examples below include the expense ratio and are intended to help the
investor understand the ongoing costs (in dollars) of investing in a Fund and to
compare these costs with the ongoing costs of investing in other Mutual Funds.
The examples are based on an investment of $1,000 made at the beginning of the
period shown and held for the entire period.

ACTUAL FUND RETURN. This section provides information about the actual account
values and actual expenses incurred by the Fund. Use the information in this
section, together with the amount invested, to estimate the expenses the
shareholder paid over the period. Simply divide the account value by $1,000 (for
example, an $8,600 account value divided by $1,000 = 8.6), then multiply the
result by the number in the first section under the heading entitled "Expenses
paid During Period" to estimate the expenses paid during this period.

HYPOTHETICAL 5% RETURN. The information in this section can be used to compare
each Fund's costs with those of other mutual funds. It assumes that the Fund had
an annual 5% return before expenses during the year, but that the expense ratio
for the period is unchanged. This example is useful in making comparisons
because the Securities and Exchange Commission requires all mutual funds to make
the 5% calculation.



                         


                                            ACTUAL FUND RETURN
- ----------------------------------------------------------------------------------------------------------
- ----------------------------------------------------------------------------------------------------------

     Beginning Account            Ending Account                                         Expenses Paid
      Value 11/1/05               Value 4/30/06          Annualized Expense Ratio        During Period
- ----------------------------------------------------   ----------------------------   --------------------
- -------------------------    -----------------------   ----------------------------   --------------------
       $ 1,000.00                 $ 1,020.70                      0.20%                       $ 1.03




                                                        HYPOTHETICAL 5% RETURN
- ------------------------------------------------------------------------------------------------------------------------
- ------------------------------------------------------------------------------------------------------------------------

     Beginning Account               Ending Account                                                  Expenses Paid
       Value 11/1/05                  Value 4/30/06                 Annualized Expense Ratio         During Period
- -----------------------------------------------------------------   ----------------------------------------------------
- ---------------------------    ----------------------------------   ------------------------    ------------------------
       $ 1,000.00                      $ 1,023.78                            0.20%                      $ 1.03





ADDITIONAL DISCLOSURE
QUARTERLY PORTFOLIO HOLDINGS
The Registrants file their complete schedule of portfolio holdings with the SEC
for the first and third quarters of each fiscal year on Form N-Q. The
Registrants' Forms N-Q are available on the SEC's website at www.sec.gov. The
Registrant's Forms N-Q may be reviewed and copied at the SEC's Public Reference
Room in Washington, DC, and information on the operation of the Public Reference
Room may be obtained by calling 800-SEC-0330. It is also available upon request
from the Registrants by calling Shareholder Services toll-free at 800-644-4563.




                       TRUSTEES AND OFFICERS OF THE TRUST



                         


- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
                                                                                                        NUMBER OF
                                   CURRENT                                                            PORTFOLIOS IN       OTHER
                                  POSITION         LENGTH                   PRINCIPAL               THE FUND COMPLEX   TRUSTEESHIPS
    TRUSTEE/OFFICER (AGE)         WITH THE         OF TIME                  OCCUPATION               OVERSEEN BY THE      HELD BY
          & ADDRESS                 TRUST          SERVED              FOR THE PAST 5 YEARS              TRUSTEE        THE TRUSTEE
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
INTERESTED TRUSTEE
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
Robert A. Fritts * (57)         Trustee **     8/97 to          Senior Vice President (9/03 to             75          None
1 Corporate Way                                present          present) and Controller of
Lansing, MI 48951                                               Jackson National Life Insurance
                                President      12/02 to         Company (9/82 to present); Vice
                                and Chief      present          President and Controller of
                                Executive                       Jackson National Life Insurance
                                Officer                         Company (8/82 to 8/03); Trustee
                                                                or Manager, and (since 12/02)
                                                                President and Chief Executive
                                                                Officer, of each other investment
                                                                company in the Fund Complex.
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------------------------------------------------------------------------------------------------------------
DISINTERESTED TRUSTEES
- ------------------------------------------------------------------------------------------------------------------------------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
Michael Bouchard (50)           Trustee **     12/03 to         Sheriff, Oakland County, Michigan          75          None
1 Corporate Way                                present          (1/99 to present);
Lansing, MI 48951                                               Senator - State of Michigan (1991
                                    to 1999);
                                                                Chairman - Financial Services
                                                                Committee (1/95 to 1/99)
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
Dominic D'Annunzio (68)         Chairman of    2/04 to          Acting Commissioner of Insurance           75          None
1 Corporate Way                 the Board **   present          for the State of Michigan (1/90
Lansing, MI 48951                                               to 5/90) (8/97 to 5/98)
                                Trustee        2/02 to
                                               present
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
Michelle Engler (48)            Trustee **     12/03 to         Attorney (1983 to present);                75          Director of
1 Corporate Way                                present          First Lady of the State of                             Federal Home
Lansing, MI 48951                                               Michigan (1990 to 2002);                               Loan
                                                                Michigan Community Service                             Mortgage
                                                                Commission Chair (1991 to 2000)                        Corporation
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
Joseph Frauenheim (71)          Trustee **     12/94 to         Consultant (Banking)                       75          None
1 Corporate Way                                present
Lansing, MI 48951
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
Richard McLellan (64)           Trustee **     12/94 to         Member, Dykema Gossett PLLC (Law           75          None
1 Corporate Way                                present          Firm)
Lansing, MI 48951
- ------------------------------- -------------- ---------------- ----------------------------------- ------------------ -------------
*   Mr. Fritts is an "interested person" of the Trust due to his position with
    Jackson National Life Insurance Company(R), which is the parent company of
    the Adviser and Distributor.
**  The Chairman of the Board, interested and disinterested Trustees are elected
    to serve for an indefinite term.







- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
                                                                                                    NUMBER OF
                                  CURRENT                                                       PORTFOLIOS IN THE         OTHER
                                 POSITION        LENGTH OF               PRINCIPAL                 FUND COMPLEX       TRUSTEESHIPS
   TRUSTEE/OFFICER (AGE) &       WITH THE           TIME                OCCUPATION               OVERSEEN BY THE       HELD BY THE
           ADDRESS                 TRUST           SERVED           FOR THE PAST 5 YEARS             TRUSTEE             TRUSTEE
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
OFFICERS
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
Mark D. Nerud (39)             Vice           8/97 to        Chief Financial Officer of the       Not Applicable     Not Applicable
225 West Wacker Drive,         President      present        Adviser (11/00 to present) and
Chicago, IL 60606                                            Managing Board Member of the
                               Treasurer      12/02 to       Adviser (11/00 to 11/03); Vice
                               and Chief      present        President, Treasurer, Chief
                               Financial                     Financial Officer of other
                               Officer                       Investment Companies advised by
                                                             the Adviser; Vice President -
                                                             Fund Accounting & Administration
                                                             of Jackson National Life
                                                             Insurance Company (1/00 to
                                                             present)
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
Susan S. Rhee (34)             Vice           2/04 to        Secretary of the Adviser (11/00      Not Applicable     Not Applicable
1 Corporate Way                President,     present        to present); Assistant Vice
Lansing, MI 48951              Counsel and                   President of Jackson National
                               Secretary                     Life Insurance Company (8/03 to
                                                             present); Associate General
                                                             Counsel of Jackson National Life
                                                             Insurance Company (7/01 to
                                                             present); Senior Attorney of
                                                             Jackson National Life Insurance
                                                             Company (1/00 to 7/01)
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
Steven J. Fredricks (35)       Chief          1/05 to        Attorney of Jackson National         Not Applicable     Not Applicable
1 Corporate Way                Compliance     present        Life Insurance Company (2/02 to
Lansing, MI 48951              Officer                       Present); Contract Attorney,
                                                             Godfrey & Kahn, S.C. (2001 -
                                                             2002); Assistant General
                                                             Counsel, Aid Association for
                                                             Lutherans (1997 to 2001)
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------
Jeffrey C. Nellessen (44)      Assistant      12/05 to       Assistant Vice President of          Not Applicable     Not Applicable
1 Corporate Way                Treasurer      present        Jackson National Life Insurance
Lansing, MI 48951                                            Company (8/05 to present);
                                                             Consultant (11/03 to 4/04);
                                                             Chief Financial Officer, Vice
                                                             President, Secretary, Treasurer
                                                             & Controller of Security Capital
                                                             (3/97 to 11/03)
- ------------------------------ -------------- -------------- ---------------------------------- ------------------- ----------------

The Statement of Additional Information includes additional information about
Fund Trustees and may be obtained at no charge by calling 1-800-392-2909, or
writing the JNL Investors Series Trust Service Center, 225 W. Wacker Drive,
Suite 1200, Chicago, IL 60606.





                   TRUSTEES OF THE JNL INVESTORS SERIES TRUST

The Trustees and officers that are interested persons of the Trust or the
Adviser do not receive any compensation from the Trust for their services as
Trustees or officers. The following persons, who are disinterested Trustees of
the Trust, received from the Trust the compensation amounts indicated for the
services as such for the 12 month period ended December 31, 2005.

- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------

                                                     PENSION OR RETIREMENT
                                   AGGREGATE       BENEFITS ACCRUED AS PART    ESTIMATED ANNUAL
                                  COMPENSATION                OF                 BENEFITS UPON       TOTAL COMPENSATION FROM
TRUSTEE                           FROM TRUST*           TRUST EXPENSES            RETIREMENT       TRUST AND FROM FUND COMPLEX
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
Michael Bouchard                    $60,000                   $0                      $0                     $60,000
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
Michelle Engler                     $60,000                   $0                      $0                     $60,000
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
Dominic D'Annunzio                  $72,500                   $0                      $0                     $72,500**
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
Joseph Frauenheim                   $70,000                   $0                      $0                     $70,000
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------
Richard McLellan                    $65,000                   $0                      $0                     $65,000
- ------------------------------ ------------------- -------------------------- -------------------- ----------------------------

*    The fees paid to the independent Trustees are paid for combined meetings of
     the Funds in the Fund complex. The fees are allocated to the Funds.

**   Mr. D'Annunzio deferred $36,250.




                             PROXY VOTING GUIDELINES

JNAM,  the Funds'  adviser,  is  responsible  for  exercising  the voting rights
associated with the securities purchased and/or held by the Funds. A description
of the policies and procedures used by the Funds to vote proxies relating to the
portfolio  securities and information on how the Funds voted proxies relating to
portfolio  securities  during  the 12  month  period  ended  June  30,  2005 are
available (1) without charge,  upon request by calling  1-800-766-4683  (Annuity
Service Center),  1-800-599-5651  (NY Annuity Service Center) or  1-800-777-7779
(for  contracts  purchased  through  a bank or  financial  institution),  (2) on
Jackson  National Life  Insurance  Company's  website at  WWW.JNL.COM or Jackson
National Life Insurance Company of New York's website at WWW.JNLNY.COM,  and (3)
on the SEC's website at WWW.SEC.GOV.




                    JNL INVESTORS SERIES TRUST (THE "TRUST")

                 TRUSTEES' CONSIDERATION OF INVESTMENT ADVISORY
                           AND SUB-ADVISORY AGREEMENTS

     Under the  Investment  Company Act of 1940 (the "1940 Act"),  an investment
advisory or  sub-advisory  contract  initially must be approved by a vote of the
majority of the outstanding  voting securities of the investment  company which,
in the case of a newly  organized  Fund (the JNL Money Market Fund,  hereinafter
referred to as the "Fund"), may be a vote by the sole initial  shareholder,  and
may  continue in effect for a period  longer than two years from the date of its
execution only so long as continuance is specifically approved at least annually
by the Board of Trustees  (the  "Trustees")  or by a vote of the majority of the
outstanding voting securities of the investment company.

     Further,  the 1940 Act requires that an investment advisory or sub-advisory
agreement,  or the continuance thereof, be approved by a vote of the majority of
the disinterested Trustees cast in person at a meeting called for the purpose of
voting  on such  approval.  The 1940 Act also  places a  specific  duty upon the
Trustees to request and evaluate,  and a corresponding  duty upon the investment
adviser or  sub-adviser  to  furnish,  such  information  as  reasonably  may be
necessary to evaluate the terms of the agreement.

     The Trustees are presented at each of their  regular  meetings with reports
and analyses by Jackson  National Asset Management LLC ("JNAM" or the "Adviser")
and the  sub-advisers  on a number  of  matters,  including  (i) the  investment
performance  of the Fund of the Trust,  in relation to benchmark  indices and in
relation  to  other  funds  having  similar  investment  objectives;  (ii)  Fund
brokerage;  and (iii) portfolio  compliance  matters.  In addition to submitting
quarterly written reports  regarding the Fund under their management,  portfolio
management  representatives  of the  Trust's  sub-adviser  also  make  in-person
reports to the Trustees on a regular basis.

     The Trustees review and consider these reports and presentations as part of
their  responsibility  to manage the  affairs of the Trust.  These  reports  and
presentations also form a part of the information  considered by the Trustees in
determining  whether to approve  the  continuation  of the  agreements  with the
Adviser and the sub-adviser.

     Described  below  is a  summary  of  certain  information  provided  to and
considered by the Trustees,  and their  conclusions with respect  thereto,  that
contributed  to the  Trustees'  decision  to approve of the  current  investment
advisory and sub-advisory agreements of the Trust.

     INVESTMENT ADVISORY AND MANAGEMENT AGREEMENT WITH THE ADVISER

     The current Investment Advisory and Management  Agreement between the Trust
and the Adviser  contemplates  a "manager  of  managers"  structure  whereby the
Adviser,  with the approval of the  Trustees but without  necessity of obtaining
shareholder approval,  may select, retain and compensate the sub-adviser for the
Fund, or materially  amend  agreements  with  sub-advisers.  The Adviser and the
Trust have been  granted an  exemption  by the SEC.  The  "manager of  managers"
structure was approved by the Trustees at a meeting held December 13, 2001.  The
form of the  Investment  Advisory and  Management  Agreement  with the Adviser's
predecessor,  JNFS,  was  approved by the  Trustees at a meeting held August 10,
2000.  The agreement  with the Adviser was approved by the  shareholders  of the
Fund, and became  effective as of January 31, 2001. At a shareholder  meeting of
the Trust  held July 11,  2005,  the  shareholders  of all Funds  approved  this
multi-manager structure.

     At its meeting on August 31, 2005,  the  Trustees,  including a majority of
the Independent Trustees, considered the commencement of operations of the Fund.
The Trustees were presented by the Adviser with information  regarding:  (1) the
nature,  quality and extent of its services,  (2) the investment  performance of
the Trust, (3) its profitability, including an analysis of the cost of providing
services and comparative expense information,  (4) the extent to which economies
of scale are  realized as the Trust grows and whether fee levels  reflect  these
economies of scale for the Trust's investors,  and (5) other "fall-out" benefits
realized by JNAM (i.e. ancillary benefits derived by JNAM or its affiliates from
JNAM's relationship with the Trust).

     NATURE, QUALITY AND EXTENT OF SERVICES

     The Trustees examined the nature,  quality and extent of the services to be
provided by the Adviser to the Fund.  The Trustees  reviewed  information on the
Adviser's key personnel that will be providing  investment  advisory services to
the Fund, including responsibilities for serving as the Fund's administrator and
transfer agent,  overseeing the Fund's sub-adviser,  monitoring adherence to the
Fund's investment  restrictions and monitoring  compliance with various policies
and procedures of the Fund.  The Trustees  concluded that there was a reasonable
basis on which  to  conclude  that the  Fund  would  benefit  from the  services
provided by the Adviser under their Agreements as a result of their  experience,
reputation, personnel, operations and resources.

     INVESTMENT PERFORMANCE OF THE FUND

     The  Trustees  considered  information  provided  by  the  Adviser  on  the
performance of the Fund,  including  comparative  performance  information.  The
composite  performance  information  provided by the  Sub-adviser  exceeded  the
Fund's benchmark performance (gross of fees) for all periods shown.

     COSTS OF SERVICES AND PROFITS REALIZED BY THE ADVISER

     The Trustees examined the advisory fee and expense information for the Fund
as compared to comparable funds managed by other advisers. The Fund's investment
management  fee of 0.20% is below the  Lipper  median  management  fee of 0.35%.
Overall  expenses  of the Fund of 0.20%  also  compare  favorably  to the Lipper
median  of 0.30%.  The  Board  considered  the  performance  of the Fund and the
Sub-adviser and the  performance of the other funds managed by the  Sub-adviser,
including  comparative  performance   information.   Fund  operations  commenced
November 1, 2005.

     ECONOMIES OF SCALE

     The  Trustees  considered  the  extent to which the  Fund's  advisory  fees
reflect economies of scale for the benefit of Fund's shareholders.  The Trustees
reviewed the Fund's fee  arrangements,  which include  breakpoints that decrease
the fee rate as the Fund's  assets  increase.  The Trustees  concluded  that the
breakpoints  in  the  Adviser's  contracts  with  the  Fund,  would  share  with
shareholders  the benefits of economies of scale as the Fund's assets grow.  The
Trustees  concluded that, under the Agreements,  shareholders would share in the
benefits to be achieved through economies of scale.

     OTHER BENEFITS TO THE ADVISER AND ITS AFFILIATES

     In  evaluating  the  benefits  that  accrue to the  Adviser,  the  Trustees
reviewed  all of the  JNL  Funds  as a  whole,  including  the  Fund  of the JNL
Investors  Series Trust.  Through its  relationship  with the Fund, the Trustees
recognized  that  the  Adviser,   and  its  affiliate,   Jackson  National  Life
Distributors, Inc. ("JNLD"), serve the Fund in various capacities,  including as
Adviser, administrator, transfer agent and distributor, and receive compensation
from the Fund in  connection  with  providing  certain of these  services to the
Fund. As administrator, the Adviser receives a fee for providing fund accounting
and administration  services to the Fund (except the Institutional  Class of the
Fund).  This  fee  also is used  by the  Adviser  to  cover  most of the  Fund's
operating  expenses.  The Trustees also review the  Administrative Fee annually.
JNAM does not  receive a fee from the JNL Funds and the  Institutional  Class of
the Fund for its transfer agent services. As distributor,  JNLD receives a 0.20%
12b-1 fee from the Fund  (except  for the S&P  Funds  and the JNL  Money  Market
Fund).  After  full  consideration  of these and other  factors,  the  Trustees,
including a majority of the Independent Trustees, concluded that approval of the
Agreements were in the best interest of the Fund and its shareholders.

     SUB-ADVISORY AGREEMENT WITH WELLINGTON MANAGEMENT COMPANY, LLP

     At its meeting on August 31, 2005,  the  Trustees of the Fund,  including a
majority  of the  Independent  Trustees,  considered  and  approved  the  Fund's
investment  sub-advisory  agreement with Wellington Management Company, LLP (the
"Sub-adviser")  through  June 30, 2007 (the  "Agreement").  In  considering  the
Agreement,  the Trustees  reviewed and analyzed the factors it deemed  relevant,
including: (1) the nature, quality and extent of the Sub-adviser's services, (2)
the investment  performance  of the Fund,  including  information  comparing the
performance of the Fund with a peer group of funds and an appropriate index, (3)
the profitability of the Sub-adviser, including an analysis of the Sub-adviser's
cost of providing  services and  comparative  expense  information,  and (4) the
extent to which  economies  of scale are  realized as the Fund grows and whether
fee levels reflect these economies of scale for Fund investors.

     The Trustees also  periodically  consider  other material facts such as the
allocation  of the  Fund's  brokerage  commissions  and  the  Fund's  record  of
compliance with its investment  policies and restrictions on personal securities
transactions.

     Before  approving the Agreement,  the Board's  Independent  Trustees met in
executive  session  with their  independent  counsel to consider  the  materials
provided by the Adviser and the Sub-adviser and the terms of the Agreement.

     Based on its evaluation of  information  provided by the  Sub-adviser,  the
Trustees,  including a majority of the Independent Trustees,  concluded that the
Agreement  is  fair  and in the  best  interests  of  shareholders.  During  its
deliberations,  the Trustees balanced the various factors based on all the facts
and  circumstances  applicable to the sub-advisory  relationship.  The following
summary does not detail every matter considered. In reaching its conclusion, the
Trustees considered the following:

     NATURE, QUALITY AND EXTENT OF SERVICES

     The  Trustees  examined  the  nature,  quality  and extent of the  services
provided by the Sub-adviser to the Fund. The Trustees reviewed the Sub-adviser's
key  personnel  in providing  investment  management  services to the Fund.  The
Trustees also considered the Sub-adviser's duties under the Agreement in serving
as the Fund's investment  Sub-adviser  including duties for investment  research
and security  selection,  adherence to the Fund's  investment  restrictions  and
monitoring  compliance with various Fund policies and  procedures.  While recent
legal and  regulatory  issues at the  Sub-adviser  are  cause for  concern,  and
require increased scrutiny by JNAM and the Trustees, the Trustees concluded that
the Fund benefits from services provided by the Sub-adviser under the Agreement,
as a result of the Sub-adviser's  management and operational changes,  portfolio
management and  investment  experience,  past  performance,  fee structure,  and
extensive resources.

     INVESTMENT PERFORMANCE OF THE SUB-ADVISER AND THE FUND

     The Trustees considered composite information,  which showed performance of
Sub-Adviser's Money Market Composite and its benchmark. On a gross of fee basis,
the  Sub-adviser  out-performed  its  benchmark  over all periods.  The Trustees
concluded  it was in the  best  interest  of the Fund  and its  shareholders  to
approve the Agreement.

     COSTS OF SERVICES AND PROFITS REALIZED BY THE SUB-ADVISER

     The Trustees examined the sub-advisory fee and expense  information for the
Fund as compared to comparable  funds managed by other advisers,  in addition to
its Lipper average.  The Trustees noted that the Fund's sub-adviser fee of 0.05%
is below the  Lipper  average  of 0.09%.  The  Trustees  noted  that the  Fund's
sub-advisory fee is reasonable.

     ECONOMIES OF SCALE

     The Trustees  considered  the extent to which the Fund's  sub-advisory  fee
reflects economies of scale for the benefit of Fund  shareholders.  The Trustees
reviewed the Fund's fee  arrangements,  which include  breakpoints that decrease
the fee rate as the Fund's  assets  increase.  The Trustees  concluded  that the
breakpoints  shared with JNAM and that JNAM in turn,  through the breakpoints in
its contract with the Fund,  shares with  shareholders the benefits of economies
of scale as the Fund's assets grow. In light of this, the Trustees noted that it
would be reasonable to conclude that under the Agreement,  shareholders share in
the benefits to be achieved through economies of scale.

     OTHER BENEFITS TO THE SUB-ADVISER AND ADVISER

     Wellington Management Company, LLP is sub-adviser to other funds advised by
JNAM.

     In  evaluating  the benefits that accrue to the  Sub-adviser,  the Trustees
reviewed the Fund as a whole, including the benefits accruing to the Adviser who
identifies  and  recommends   the   Sub-adviser  to  the  JNLIST.   Through  its
relationship with the Fund, the Trustees recognized that the Sub-Adviser and its
affiliate  serve the Fund in various  capacities.  After full  consideration  of
these and other factors,  the Trustees,  including a majority of the Independent
Trustees,  concluded  that approval of the Agreement was in the best interest of
the Fund and its shareholders.



Item 2. Code of Ethics.

Not applicable to the semi-annual filing.


Item 3. Audit Committee Financial Expert.

Not applicable to the semi-annual filing.


Item 4. Principal Accountant Fees and Services.

Not applicable to the semi-annual filing.


Item 5.  Audit Committee of Listed Registrants.

Not applicable as this is not a listed issuer as defined in Rule 10A-3 under the
Exchange Act.


Item 6. Schedule of Investments

Included as a Part of the Report to Shareholders filed under Item 1.


Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End
Management Investment Companies.

Not applicable as this is an Open-End Management Investment Company.


Item 8. Portfolio Managers of Closed-End Management Investment Companies.

Not applicable as this is an Open-End Management Investment Company.


Item 9. Purchases of Equity Securties by Closed-End Management Investment
Company and Affiliated Purchasers.

Not applicable as this is an Open-End Management Investment Company.


Item 10.  Submission of Matters to a Vote of Security Holders.

The Board of  Trustees/Managers  formalized the procedures by which shareholders
may  recommend  nominees to the  registrant's  Board of  Trustees/Managers.  The
procedures  were formalized  after the  registrant's  previous  response to this
Item. The  procedures  provide an address to which  shareholder  nominees may be
submitted.  The  procedures  can be  found  in  the  Registrant's  Statement  of
Additional Information.


Item 11. Controls and Procedures.

(a) In order to ensure that the information that we must disclose in our filings
with the Securities and Exchange Commission is recorded,  processed,  summarized
and  reported  on a  timely  basis,  we have  adopted  disclosure  controls  and
procedures. Our President and Chief Executive Officer, Robert A. Fritts, and our
Chief  Financial  Officer,  Mark D.  Nerud,  have  reviewed  and  evaluated  our
disclosure  controls and procedures as of June 22, 2006, and have concluded that
our disclosure controls and procedures are effective.

     (b) There  were no  changes  in the  registrant's  internal  control  over
financial  reporting  (as  defined in Rule  30a-3(d)  under the 1940 Act (17 CFR
270.30a-3(d))  that  occurred  during the  registrant's  first and second fiscal
quarters of the period covered by this report that has materially  affected,  or
is reasonably  likely to materially  affect,  the registrant's  internal control
over financial reporting.


Item 12. Exhibits

        a. (1)  Not applicable to the semi-annual filing.
           (2)  The certifications required by Rule 30a-2 of the Investment
                Company Act of 1940, as amended, are attached hereto.
           (3)  Not Applicable.

        b. (1)The certification required by Rule 30a-2(b) fo the Investment
           Company Act of 1940, as amended, and Section 906 of the
           Sarbanes-Oxley Act of 2002, is attached hereto.



                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, as amended,  the registrant has duly caused this
report to be signed on its behalf by the undersigned,  thereunto duly authorized
in the City of Lansing and State of Michigan, on the 28th day of June, 2006.

JNL Investors Series Trust
(Registrant)

By:   /s/ Robert A. Fritts
      ------------------------------
      Robert A. Fritts, President



     Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, as amended, this report has been signed below by
the following  persons on behalf of the  registrant and in the capacities and on
the dates indicated.


Signature                            Title                         Date

/s/ Robert A. Fritts                 President                June 28, 2006
- -----------------------------
Robert A. Fritts


/s/ Mark D. Nerud                    Chief Financial Officer  June 28, 2006
- -----------------------------
Mark D. Nerud




                                  EXHIBIT LIST

Exhibit 12(a)(2)        Certification of the Principal Executive Officer
                        required by Rule 30a-2(a) under the Act.

                        Certification of the Principal Financial Officer
                        required by Rule 30a-2(a) under the Act.

Exhibit 12(b)(1)        Certification required by Rule 30a-2(b) under the Act.