UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 14A

           Proxy Statement Pursuant to Section 14(a) of the Securities
                      Exchange Act of 1934 (Amendment No. )

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     14A-6(e)(2))

[X]  Definitive Proxy Statement

[ ]  Definitive Additional Materials

[ ]  Soliciting Material Pursuant to Section 240.14a-12

                         RiverSource Sector Series, Inc.
                (Name of Registrant as Specified In Its Charter)

- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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[ ]  Fee paid previously with preliminary materials.

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                                RIVERSOURCE FUNDS

                         734 Ameriprise Financial Center
                          Minneapolis, Minnesota 55474

                   NOTICE OF A SPECIAL MEETING OF SHAREHOLDERS

                             TO BE HELD JUNE 2, 2009

RIVERSOURCE SECTOR SERIES, INC.
RiverSource Real Estate Fund

A Special Meeting of Shareholders (the "Meeting") of RiverSource Real Estate
Fund (the "Fund") will be held at 10 a.m. CDT on June 2, 2009, at The Marquette
Hotel, 710 Marquette Avenue, Minneapolis, Minnesota in the Minnesota River Room
on the Third Floor. At the Meeting, shareholders will consider the following
proposal with respect to the Fund:

     To approve the change in the classification of the Fund from a
     "diversified" fund to a "non-diversified" fund, as such terms are defined
     under the Investment Company Act of 1940, as amended.

Shareholders will also consider any other business as may properly come before
the Meeting, or any adjourned or postponed sessions thereof.

Please take some time to read the enclosed proxy statement. It discusses the
proposal in more detail. If you were a shareholder on April 3, 2009, you may
vote at the Meeting or at any adjournment or postponement of the Meeting. We
hope you can attend the Meeting. If you cannot attend, please vote by telephone,
internet or mail. Just follow the instructions on the enclosed proxy card. If
you have questions, please call the Fund's proxy solicitor toll free at (866)
438-8932. It is important that you vote. The Board of Directors of the Fund
recommends that you vote FOR the proposal. The proxy statement is expected to be
mailed to shareholders on or about April 17, 2009.

                                        By order of the Board of Directors

                                        Scott R. Plummer, Secretary

                                        April 17, 2009



                       THIS PAGE LEFT BLANK INTENTIONALLY



RIVERSOURCE SECTOR SERIES, INC.
RiverSource Real Estate Fund

                                 PROXY STATEMENT

                              DATED APRIL 17, 2009

This document is a proxy statement for RiverSource Real Estate Fund (the
"Fund"). The address and telephone number of the Fund are 734 Ameriprise
Financial Center, Minneapolis, Minnesota 55474 and (888) 791-3380. This proxy
statement and the enclosed proxy card are expected to be mailed to shareholders
on or about April 4, 2009. This proxy statement contains information you should
know before voting on the following proposal with respect to the Fund:

     To approve a change in the classification of the Fund from a "diversified"
     fund to a "non-diversified" fund, as such terms are defined under the
     Investment Company Act of 1940, as amended (the "1940 Act").

Shareholders will also consider any other business that may properly come before
the meeting, or any adjourned or postponed sessions thereof.

The proposal will be considered by shareholders of the Fund at a special meeting
of shareholders (the "Meeting") that will be held at 10 a.m. CDT on June 2,
2009, at The Marquette Hotel, 710 Marquette Avenue, Minneapolis, Minnesota 55402
in the Minnesota River Room on the Third Floor. The Fund is a series of a
registered open-end management investment company. Please read this proxy
statement and keep it for future reference.

To ask questions about this proxy statement, please call the Fund's proxy
solicitor, Computershare Fund Services, toll free at (866) 438-8932.

The Fund is subject to the information requirements of the Securities Exchange
Act of 1934 and the 1940 Act and files reports, proxy materials and other
information with the Securities and Exchange Commission (the "SEC"). These
reports, proxy materials and other information can be inspected and copied at
the Public Reference Room maintained by the SEC. Copies may be obtained, after
paying a duplicating fee, by electronic request at publicinfo@sec.gov, or by
writing to the Public Reference Section of the SEC, 100 F Street, N.E.,
Washington, D.C. 20549-0102. In addition, copies of these documents may be
viewed on-line or downloaded from the SEC's website at www.sec.gov.

PLEASE NOTE THAT THE FUND IS NOT A BANK DEPOSIT, IS NOT FEDERALLY INSURED, IS
NOT ENDORSED BY ANY BANK OR GOVERNMENT AGENCY AND IS NOT GUARANTEED TO ACHIEVE
ITS INVESTMENT OBJECTIVE.

As with all mutual funds, the SEC has not approved or disapproved these
securities or passed on the adequacy of this proxy statement. Any representation
to the contrary is a criminal offense.



                            RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT  1



FEES AND EXPENSES

The costs incurred in connection with the solicitation of proxies, the costs of
holding the Meeting (including any adjourned or postponed sessions thereof) and
all other expenses associated with obtaining the approval of the shareholders of
the Fund will be borne by RiverSource Investments, LLC ("RiverSource
Investments"), the Fund's investment manager.

PROPOSAL: TO CHANGE THE CLASSIFICATION OF THE FUND FROM A "DIVERSIFIED" FUND TO
A "NON-DIVERSIFIED" FUND

The Board of Directors (the "Board") has approved, and recommends that
shareholders approve, the proposal to change the classification of the Fund from
a "diversified" fund to a "non-diversified" fund, as such terms are defined
under the Investment Company Act of 1940, as amended (the "1940 Act") (the
"Reclassification"). There will be no adverse tax consequences as a result of
the change in classification.

FUND CLASSIFICATION. The Fund is currently classified as a diversified fund
under the 1940 Act. This means that the Fund may not, with respect to 75% of its
total assets, invest more than 5% of its total assets in any one issuer or
purchase more than 10% of the outstanding voting securities of any one issuer.
With respect to the remaining 25% of the Fund's total assets, there is no
limitation on the amount of assets the Fund may invest in any one issuer.
Section 13(a)(1) of the 1940 Act provides that shareholder approval is required
for a fund to change its classification from a diversified fund to a non-
diversified fund. It is the position of the staff of the Securities and Exchange
Commission that a fund that is classified as a non-diversified fund but has
operated as a diversified fund for more than three consecutive years has changed
its status to that of a diversified fund. The Fund's current classification as a
diversified fund results from its having operated as diversified Fund for more
than three consecutive years. The Fund is seeking shareholder approval to
restore its non-diversified classification because RiverSource Investments, its
investment manager, believes that the Fund will benefit from the additional
investment flexibility, and because a diversified fund may convert to non-
diversified status only with shareholder approval.

The Fund is also subject to certain additional diversification requirements
under the Internal Revenue Code of 1986, as amended (the "Code"). With respect
to 50% of the Fund's total assets, the Fund may not invest more than 5% of its
total assets in any one issuer and may not purchase more than 10% of the
outstanding voting securities of any one issuer. With respect to the remaining
50% of the Fund's total assets, the Fund may not invest more than 25% of its
assets in any one issuer. If this proposal is approved, the Fund will continue
to be subject to the Code's diversification requirements with respect to
regulated investment companies.



 2  RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT



REASONING AND POTENTIAL RISK. The Fund's investment manager is seeking the
flexibility to invest more of the Fund's assets in a smaller number of issuers
because due to current market conditions, a number of companies operating in the
real estate industry, including equity securities of real estate investment
trusts (REITs), which the Fund generally invests in, have dramatically declined
in their stock prices, have been bought out or have gone to bankruptcy. Also the
top 5 stocks in the Dow Jones Wilshire Real Estate Securities Index (the
"Index"), the Fund's primary benchmark, constitute 30% of the Index and the top
10 stocks in the Index constitute 45% of the Index. Under these circumstances
the investment manager has fewer companies to invest in to achieve Fund's
investment objective and to comply with its investment policies. In this
connection, the investment manager is not able to fully weight the top 5 stocks
in the Index and continue to manage the Fund as a "diversified" fund. The
investment manager believes the proposed change in classification from
"diversified" to "non-diversified" will provide the investment manager the
flexibility to more effectively manage the Fund in the current market
conditions, and will allow the Fund to better pursue its investment objective of
providing shareholders with total return from both current income and capital
appreciation. Even if this proposal is approved, the Fund's investment manager
may or may not operate the Fund as non-diversified, depending on its assessment
of the investment opportunities available to the Fund from time to time. (Of
course, pursuant to Rule 13a-1, should the Fund operate as a "diversified" fund
for a period of three consecutive years, it would revert to its diversified
status).

A non-diversified fund may invest more of its assets in the securities of fewer
companies than if it were a diversified fund, and therefore is subject to
greater risk. Because each investment may have a greater effect on a non-
diversified fund's performance, a non-diversified fund may be more exposed to
the risks of loss and volatility than a fund that invests more broadly.

BOARD RECOMMENDATION AND VOTE REQUIRED. The Board recommends that you vote to
change the classification of the Fund to non-diversified. Approval of the
proposed change requires the favorable vote of the lesser of (a) a majority of
the Fund's outstanding voting securities or (b) 67% or more of the Fund's
outstanding voting securities present at the meeting, so long as more than 50%
of the outstanding voting securities are present. If shareholders approve the
proposed change, it will take effect shortly after the Meeting. If the proposed
change is not approved, the Fund will continue to operate as a diversified fund.



                            RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT  3



OTHER INFORMATION

INVESTMENT MANAGER

The current investment adviser to the Fund is RiverSource Investments, LLC, a
wholly-owned subsidiary of Ameriprise Financial, Inc. Its business address is
200 Ameriprise Financial Center, Minneapolis, MN 55474.

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The current independent registered accounting firm of the Fund is Ernst & Young
LLP. Its business address is 220 South 6th Street, Suite 1400, Minneapolis, MN
55402.

DISTRIBUTOR

The Fund's current Distributors are RiverSource Distributors, Inc. and
RiverSource Fund Distributors, Inc., each at 50611 Ameriprise Financial Center,
Minneapolis, MN 55474.

ADMINISTRATOR

The current administrator is Ameriprise Financial, Inc. ("Ameriprise"). Its
business address is 200 Ameriprise Financial Center, Minneapolis, MN 55474.

SHAREHOLDER COMMUNICATIONS

Shareholders may communicate with the Board as a group or individually. Any such
communications should be sent to the Board of the Fund or to an individual
director in writing, c/o the Secretary of the Fund, at 50606 Ameriprise
Financial Center, Minneapolis, Minnesota 55474. The Secretary may determine not
to forward to the Board of Directors any letter that does not relate to the
business of the Fund.

PROXY STATEMENT DELIVERY

"Householding" is the term used to describe the practice of delivering one copy
of a document to a household of shareholders instead of delivering one copy of a
document to each shareholder in the household. Certain shareholders of the Fund
who share a common address and who have not opted out of the householding
process may receive a single copy of the proxy statement along with the proxy
card(s). If you received more than one copy of the proxy statement, you may
elect to household in the future if permitted by your financial
intermediary/financial institution. Contact the financial intermediary/financial
institution through which you purchased the Fund to determine whether
householding is an option for your account. If you received a single copy of the
proxy statement, you may opt out of householding in the future by contacting
your financial intermediary/financial institution.



 4  RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT



An additional copy of this proxy statement may be obtained by writing to the
following address: Computershare Fund Services, c/o Operation Department, 280
Oser Ave., Hauppauge, NY 11788 or calling Computershare Fund Services, toll free
at (866) 438-8932.

SHAREHOLDER REPORTS

The Fund will furnish, without charge, a copy of its most recent annual report
and, if applicable, its most recent semiannual report subsequent to such annual
report, to its shareholders on request. For a copy at no charge of any of the
documents listed above and/or to ask questions about this proxy statement, call
the Fund's proxy solicitor at (866) 438-8932.

BENEFICIAL OWNERS OF FUND SHARES IN EXCESS OF 5%

The chart below lists the persons that, to the knowledge of the Fund, owned
beneficially more than 5% of the outstanding shares of any class of the Fund as
of Jan. 31, 2009. A shareholder who owns beneficially, directly or indirectly,
more than 25% of any Fund's voting securities may be deemed to "control" (as
defined in the 1940 Act) the Fund. The directors and officers of the Fund, in
the aggregate, owned less than 1% of each Fund's outstanding shares as of Jan.
31, 2009.

RIVERSOURCE REAL ESTATE FUND



                                                        PERCENT OF
                           5% OWNERS                   SHARES HELD
                                                 
CLASS A   Charles Schwab & Co., Inc. ("Charles
          Schwab") a brokerage firm in San Francisco,
          CA                                              11.92%
CLASS B   None                                              N/A
CLASS C   None                                              N/A
CLASS I   RiverSource Income Builder Basic Income
          Fund*                                            5.95%
          RiverSource Income Builder Enhanced Income
          Fund*                                           11.95%
          RiverSource Income Builder Moderate Income
          Fund*                                           25.34%
          RiverSource Portfolio Builder Aggressive
          Fund*                                            7.33%
          RiverSource Portfolio Builder Moderate
          Fund*                                           16.76%
          RiverSource Portfolio Builder Moderate
          Aggressive Fund*                                16.19%
          RiverSource Portfolio Builder Moderate
          Conservative Fund*                               6.48%
          RiverSource Portfolio Builder Total Equity
          Fund*                                            6.18%
CLASS R4  Charles Schwab                                  94.40%
          RiverSource Investments, LLC ("RiverSource
          Investments"), Minneapolis, MN                   5.60%
CLASS W   RiverSource Investments                           100%




* The combination of RiverSource Investments initial capital investment (seed
  account) and RiverSource Portfolio Builder Funds (affiliated "funds-of-funds")
  investments in Class I shares in RiverSource Real Estate Fund represents
  aggregate ownership of 59.4% of the Fund. RiverSource Investments (investment
  manager for RiverSource Real Estate Fund and the funds-of-funds) does not
  invest in the Fund for the purpose of exercising control. However, since these
  ownership


                            RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT  5



  interests may be significant, in excess of 25% of the Fund, such that these
  entities may be deemed to control the Fund, procedures have been put in place
  to assure that public shareholders determine the outcome of all actions taken
  at shareholder meetings. Specifically, RiverSource Investments (which votes
  proxies for the seed account) and the funds-of-funds' Board (which votes
  proxies for the funds-of-funds) vote the proposal in the same proportion that
  other shareholders vote on the proposal.

OUTSTANDING SHARES

For each class of the Fund's shares entitled to vote at the Meeting, the number
of shares outstanding as of April 3, 2009 was as follows:

RIVERSOURCE REAL ESTATE FUND

<Table>
<Caption>
                                               NET ASSETS VALUE     SHARES
                                   NET ASSETS      PER SHARE     OUTSTANDING
                                                        
Class A                           $37,404,832        $5.69         6,571,562
Class B                             5,701,169         5.65         1,009,224
Class C                               749,570         5.64           132,833
Class I                            86,377,572         5.70        15,146,699
Class R4                               52,644         5.67             9,290
Class W                                 1,559         5.67               275
</Table>


PROXY VOTING AND SHAREHOLDER MEETING INFORMATION

VOTING. Shareholders of record of the Fund on April 3, 2009 are entitled to vote
based on their total dollar interest in the Fund irrespective of which class
they own.

A quorum is required to take action at the Meeting. With respect to the Fund,
the presence at the Meeting, in person or by proxy, of shareholders entitled to
cast at least ten percent (10%) of the shares outstanding and entitled to vote
at the Meeting shall constitute a quorum.

All votes count toward a quorum, regardless of how they are voted (For, Against
or Abstain). Broker non-votes will be counted toward a quorum but not toward the
approval of the proposal. (Broker non-votes are shares for which the underlying
owner has not voted and the broker holding the shares does not have authority to
vote.)

If your shares are held in an IRA account with Ameriprise Trust Company as
custodian, you have the right to instruct the IRA Custodian how to vote those
shares. The IRA Custodian will vote any shares for which it has not received
voting instructions in proportionately the same manner  -- either For, Against,
or Abstain -- as other Fund shareholders have voted.

PROXY SOLICITATION. If you properly authorize your proxy by internet, telephone
or facsimile, or by executing and returning the enclosed proxy card by mail, and
your proxy is not subsequently revoked, your votes will be cast at the Meeting,


 6  RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT



and at any postponement or adjournment thereof. If you give instructions, your
votes will be cast in accordance with your instructions. If you return your
signed proxy card without instructions, your votes will be cast in favor of the
Reclassification of the Fund.

REVOKING YOUR PROXY. If you execute, date and submit a proxy card in respect of
the Fund, you may revoke your proxy or change it by providing written notice to
the Fund (Attention: Secretary) at 50606 Ameriprise Financial Center,
Minneapolis, MN 55474, by submitting a subsequently executed and dated proxy
card, by authorizing your proxy by internet, telephone or facsimile on a later
date or by attending the Meeting and casting your vote in person. If you
authorize your proxy by internet, telephone or facsimile, you may revoke it by
authorizing a subsequent proxy by internet, telephone or facsimile or by
completing, signing and returning a proxy card dated as of a date that is later
than your last internet, telephone or facsimile proxy authorization or by
attending the Meeting and casting your vote in person. Merely attending the
Meeting without voting will not revoke your prior proxy.

SOLICITATION OF PROXIES. The Board is asking for your vote and for you to vote
as promptly as possible. The expenses of the solicitation will be paid by
RiverSource Investments. Supplementary solicitations may be made by internet,
telephone or facsimile, or by personal contact. Computershare Fund Services has
been engaged to assist in the solicitation of proxies, at an aggregate estimated
cost of $7,627.

SHAREHOLDER PROPOSALS. No proposals were received from shareholders. The Fund
does not hold annual meetings of shareholders. Shareholders who wish to make a
proposal at the Fund's next special meeting, which may or may not be included in
the Fund's proxy materials, must notify the Fund in a reasonable amount of time
before the Fund begins to print and mail its proxy materials. The fact that the
Fund receives a shareholder proposal in a timely manner does not ensure
inclusion of the proposal in the proxy materials, as there are other
requirements in the proxy rules relating to such inclusion.

If a shareholder who wishes to submit a proposal fails to timely notify the
Fund, the persons named as proxies for the meeting will have discretionary
authority to vote on the shareholder's proposal if it is properly brought before
the Meeting. If a shareholder makes a timely notification, the persons named as
proxies may still exercise discretionary voting authority under circumstances
consistent with the SEC's proxy rules.

OTHER BUSINESS. The Board does not know of any matters to be presented at the
Meeting other than the proposal. If other business should properly come before
the Meeting, the persons named as proxies will vote thereon in their discretion.



                            RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT  7



ADJOURNMENT. In the event that not enough votes are received by the time
scheduled for the Meeting, or, even if a quorum is present, if sufficient votes
in favor of the proposal are not received and tabulated prior to the time
scheduled for the Meeting, the Meeting may be adjourned, with no notice other
than an announcement at the Meeting, to a date no later than the 120th day after
the original record date for the Meeting to allow further solicitation of
shareholders for the proposal. Shareholders also may adjourn the Meeting,
subject to the same conditions as apply to the chairman of the Meeting, with no
notice other than an announcement at the Meeting.

If insufficient votes are received by the time of the Meeting, the persons named
as proxies will vote in favor of adjournment those shares they are entitled to
vote that have voted in favor of the proposal. They will vote against any
adjournment those shares that have voted against the proposal. The costs of any
additional solicitation and of any adjourned meeting will be borne by
RiverSource Investments. A shareholder vote may be taken on one or more of the
items in this proxy statement prior to adjournment if sufficient votes have been
received.



 8  RIVERSOURCE REAL ESTATE FUND -- PROXY STATEMENT



                       THIS PAGE LEFT BLANK INTENTIONALLY



                       THIS PAGE LEFT BLANK INTENTIONALLY





                                                                           19835




                                                     
PROXY                                             RIVERSOURCE FUNDS                                             PROXY
                                           RIVERSOURSE SECTOR SERIES, INC.
                                             RIVERSOURCE REAL ESTATE FUND
                                     NOTICE OF A SPECIAL MEETING OF SHAREHOLDERS
                                              TO BE HELD ON JUNE 2, 2009

THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD OF DIRECTORS OF RIVERSOURCE REAL ESTATE FUND.

The undersigned hereby constitutes and appoints Stephen R. Lewis, Jr., Scott R. Plummer and Christopher O. Petersen,
and each of them, as proxies for the undersigned, with full power of substitution and resubstitution, and hereby
authorizes said proxies, and each of them, to represent and vote, as designated on the reverse side, all shares of
RiverSource Real Estate Fund held of record by the undersigned on April 3, 2009 at the Special Meeting of
Shareholders to be held on June 2, 2009 (the Meeting), and at any adjournment thereof. The undersigned hereby revokes
any previous proxies with respect to such shares of the undersigned.

THIS PROXY CARD, WHEN PROPERLY EXECUTED WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY THE UNDERSIGNED
SHAREHOLDER(S), AND, IN THE DISCRETION OF SUCH PROXIES, UPON ANY AND ALL OTHER BUSINESS AS MAY PROPERLY COME BEFORE
THE MEETING OR ANY ADJOURNMENT THEREOF, INCLUDING, BUT NOT LIMITED TO, PROPOSING AND/OR VOTING ON ADJOURNMENT OF THE
MEETING WITH RESPECT TO THE PROPOSAL, INCLUDING, BUT NOT LIMITED TO, IN THE EVENT THAT SUFFICIENT VOTES IN FAVOR OF
THE PROPOSAL ARE NOT RECEIVED. IF THIS PROXY CARD IS SIGNED, DATED AND RETURNED WITH NO VOTING INSTRUCTION INDICATED
AS TO THE PROPOSAL ON WHICH SHARES REPRESENTED BY THE UNDERSIGNED ARE ENTITLED TO VOTE, SUCH SHARES SHALL BE VOTED
"FOR" THE PROPOSAL.

                                                                          VOTE VIA TELEPHONE: 1-866-241-6192
                                                                          VOTE VIA THE INTERNET: www.proxy-direct.com
                                                                          [999 9999 9999 999] [_____________________]

                                                                          NOTE: Please sign exactly as your name
                                                                          appears on this Proxy Card and date it. If
                                                                          signing for estates, trusts or corporations,
                                                                          title or capacity should be stated. If
                                                                          shares are held jointly, each holder must
                                                                          sign.


                                                                          -------------------------------------------
                                                                          Signature


                                                                          -------------------------------------------
                                                                          Additional Signature (if held jointly)


                                                                          -------------------------------------------
                                                                          Date                       RSF_19835_040609

                                                    VOTING OPTIONS

                              READ YOUR PROXY STATEMENT AND HAVE IT AT HAND WHEN VOTING.

            (GRAPHIC)                    (GRAPHIC)                   (GRAPHIC)                      (GRAPHIC)
      VOTE ON THE INTERNET             VOTE BY PHONE               VOTE BY MAIL                  VOTE IN PERSON
           LOG ON TO:               CALL 1-866-241-6192   VOTE, SIGN AND DATE THIS PROXY   ATTEND SHAREHOLDER MEETING
      www.proxy-direct.com          FOLLOW THE RECORDED       CARD AND RETURN IN THE             MARQUETTE HOTEL
FOLLOW THE ON-SCREEN INSTRUCTIONS      INSTRUCTIONS            POSTAGE-PAID ENVELOPE          710 MARQUETTE AVENUE
       AVAILABLE 24 HOURS           AVAILABLE 24 HOURS                                        MINNEAPOLIS, MN 55402
                                                                                                 ON JUNE 2, 2009



                                                     
IF YOU DO NOT INDICATE A CHOICE, YOUR RETURN OF THIS SIGNED FORM SHALL BE CONSIDERED AS INSTRUCTIONS TO VOTE "FOR"
APPROVAL OF THE PROPOSAL. In their discretion, the proxies are authorized to vote upon such other business as may
properly come before the Meeting. The Board of Directors recommends a vote "FOR" the proposal

PLEASE MARK BOXES BELOW IN BLUE OR BLACK INK AS FOLLOWS. EXAMPLE: [X]

                                                                                          FOR     AGAINST     ABSTAIN
1.   To approve a change in the classification of RiverSource Real Estate Fund from a     [ ]       [ ]         [ ]
     "diversified" fund to a "non-diversified" fund.

           IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR RIVERSOURCE REAL ESTATE FUND
                                   SHAREHOLDER MEETING TO BE HELD ON JUNE 2, 2009.
              THE PROXY STATEMENT FOR THIS MEETING IS AVAILABLE AT https://www.proxy-direct.com/rfs19835

                 EVERY VOTE IS IMPORTANT! PLEASE VOTE TODAY USING ONE OF THE FOUR AVAILABLE OPTIONS!
                                                   RSF_19835_040609




RIVERSOURCE SECTOR SERIES, INC.
RiverSource Real Estate Fund

                                      LOGO

                                                                  April 17, 2009

HERE IS A BRIEF OVERVIEW OF THE PROPOSAL FOR RIVERSOURCE REAL ESTATE FUND (THE
"FUND"). THIS IS MERELY A SUMMARY. PLEASE READ THE FULL TEXT OF THE ENCLOSED
PROXY STATEMENT BEFORE VOTING.

Q: WHY AM I BEING ASKED TO VOTE?

Mutual funds are required to get shareholders' approval for certain kinds of
changes, such as the proposed change in classification of the Fund from a
"diversified" fund to a "non-diversified" fund, as such terms are defined in the
Investment Company Act of 1940, as amended (the "1940 Act") (the
"Reclassification"), as described in the enclosed proxy statement.

Q: WHAT AM I BEING ASKED TO VOTE ON?

Shareholders are being asked to vote on the Reclassification. If the
Reclassification is approved by shareholders, the Fund will be classified as a
"non-diversified" fund for purposes of the 1940 Act. The Fund's investment
manager, RiverSource Investments, LLC believes the increased flexibility
resulting from the Reclassification will allow the Fund to better pursue its
investment objective of providing shareholders with total return from both
current income and capital appreciation.

Please read the full text of the proxy statement to obtain a more detailed
understanding of the issues.

Q: HOW DOES THE BOARD RECOMMEND THAT I VOTE?

After careful consideration, the Board of Directors of the Fund recommends that
you vote FOR the Reclassification of the Fund.

Q: HOW DO I VOTE?

You can vote in one of four ways:

- - By telephone

- - By internet

- - By mail with the enclosed proxy card

- - In person at the meeting

Please refer to the enclosed proxy card for the telephone number and internet
address.



Q: WHOM SHOULD I CALL IF I HAVE QUESTIONS?

If you have questions about the proposal described in the enclosed proxy
statement or about voting procedures, please call the Fund's proxy solicitor,
Computershare Fund Services, toll free at (866) 438-8932.