TCW CONVERTIBLE SECURITIES FUND INC
497, 1998-07-07
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<PAGE>
 
PROSPECTUS           TCW CONVERTIBLE SECURITIES FUND, INC.
[LOGO OF TCW]          7,737,466 SHARES OF COMMON STOCK
                       ISSUABLE UPON EXERCISE OF RIGHTS
                 TO SUBSCRIBE FOR SUCH SHARES OF COMMON STOCK
 
                               ----------------
 
  TCW Convertible Securities Fund, Inc. (the "Fund"), is issuing to its
shareholders of record ("Record Date Shareholders") as of the close of
business on June 29, 1998, rights ("Rights") entitling the holders thereof to
subscribe for an aggregate of 7,737,466 shares (the "Shares") of the Fund's
Common Stock (the "Offer") at the rate of one share of Common Stock for each
five Rights held. The Offer also entitles the Record Date Shareholders to
subscribe, subject to certain limitations and subject to allotment, for any
Shares not acquired by exercise of primary subscription rights. The Rights are
non-transferable and will not be admitted for trading on the New York Stock
Exchange ("NYSE"). THE SUBSCRIPTION PRICE PER SHARE (the "Subscription Price")
WILL BE THE GREATER OF (1) NET ASSET VALUE PER SHARE ON JULY 29, 1998; OR
(2) 90% OF THE AVERAGE OF THE CLOSING SALE PRICES OF A SHARE OF THE FUND'S
COMMON STOCK AT THE CLOSE OF BUSINESS ON JULY 29, 1998 AND THE FOUR PRECEDING
BUSINESS DAYS.
 
  THE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON JULY 28, 1998
(THE "EXPIRATION DATE").
 
  As a result of the terms of the Offer, shareholders who do not fully
exercise their Rights will, upon completion of the Offer, own a smaller
proportional interest in the Fund than would otherwise be the case. Such
shareholders would also forego the opportunity to purchase shares of the Fund
at a discount from market price if such market price remains above net asset
value at the end of the offering period. This Prospectus tells investors
briefly the information they should know before investing in the Fund. This
Prospectus should be read and retained for future reference. The telephone
number for all questions and inquiries relating to the Offer is 1-888-501-
9723.
 
  A Statement of Additional Information dated June 30, 1998 has been filed
with the Securities and Exchange Commission and contains certain financial
statements of the Fund. A copy may be obtained without charge by calling (800)
386-3829 or writing the Fund at 865 South Figueroa Street, Suite 1800, Los
Angeles, California 90017. The Fund's telephone number is (213) 244-0000. The
Statement of Additional Information is incorporated herein by reference.
 
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
   AND EXCHANGE COMMISSION OR ANY STATE OR OTHER SECURITIES COMMISSION, NOR
    HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY STATE OR OTHER
      SECURITIES COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF THIS
       PROSPECTUS.  ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
         OFFENSE.
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                          UNDERWRITING
                                      SUBSCRIPTION        DISCOUNTS AND        PROCEEDS TO
                                          PRICE            COMMISSIONS       THE FUND(1)(2)
- -------------------------------------------------------------------------------------------
<S>                                <C>                 <C>                 <C>
Per Share.......................          $9.75               None                $9.75
- -------------------------------------------------------------------------------------------
Total...........................       $75,440,293            None             $75,440,293
</TABLE>
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
(1) Estimated based on an assumed subscription price per share of $9.75.
(2) Before deduction of expenses incurred by the Fund, estimated at $200,000.
 
June 30, 1998
<PAGE>
 
                                   FEE TABLE
 
<TABLE>
    <S>                                                                 <C>
     Shareholder Transaction Expenses*
       Sales Load (as a percentage of offering price)................... None
       Dividend Reinvestment and Cash Purchase Plan Fees................ None

     Annual Expenses (as a percentage of net assets attributable to
      common shares)
       Management Fees.................................................. 0.58%
       Other Expenses................................................... 0.16%
                                                                         ----
       Total Annual Expenses............................................ 0.74%
                                                                         ====
</TABLE>
 
<TABLE>
<CAPTION>
                     EXAMPLE                     1 YEAR 3 YEARS 5 YEARS 10 YEARS
                     -------                     ------ ------- ------- --------
     <S>                                         <C>    <C>     <C>     <C>
     You would pay the following expenses* on a
      $1,000 investment, assuming five percent
      annual return............................    $8     $24     $42     $94
</TABLE>
- --------
* Excludes brokerage commissions paid on purchases and sales of shares of
  Common Stock of the Fund.
 
  The foregoing information is intended to assist the investor in understanding
the various costs and expenses that an investor in TCW Convertible Securities
Fund, Inc. (the "Fund") will bear directly or indirectly. See "Investment
Advisory and Other Services" for a description of the Investment Advisory
Agreement and expenses borne by the Fund. The example is included to provide a
means for the investor to compare expense levels of investment companies with
different fee structures over varying investment periods. To facilitate such
comparison, all investment companies are required to utilize a hypothetical five
percent annual return assumption. This assumption is unrelated to the Fund's
prior performance and is not a projection of future performance. THE EXAMPLE
SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE EXPENSES. ACTUAL
EXPENSES MAY BE GREATER OR LESSER THAN THOSE SHOWN.
 
                                       2
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following summary is qualified in its entirety by reference to the more
detailed information included elsewhere in this Prospectus.
 
TERMS OF THE OFFER
 
  TCW Convertible Securities Fund, Inc. (the "Fund") is issuing to shareholders
of record ("Record Date Shareholders") as of the close of business on June 29,
1998 (the "Record Date") rights ("Rights") to subscribe for an aggregate of
7,737,466 shares of Common Stock (sometimes referred to herein as the "Shares")
of the Fund. Each such shareholder is being issued one Right for each full
share of Common Stock owned on the Record Date. The Rights entitle the holder
thereof to acquire at the Subscription Price (as hereinafter defined) one Share
for each five Rights held. Rights may be exercised at any time during the
period (the "Subscription Period"), which commences on the date of this
Prospectus and ends at 5:00 p.m., New York City time, on July 28, 1998 (the
"Expiration Date"). The right to acquire one additional Share for each five
Rights held during the Subscription Period is hereinafter referred to as the
"Primary Subscription."
 
  In addition, any Record Date Shareholder who fully exercises all Rights
initially issued to him (other than those Rights which cannot be exercised
because they represent the right to acquire less than one Share) is entitled to
subscribe for Shares which were not subscribed for by other shareholders in the
Primary Subscription (the "Over-Subscription Privilege"). For purposes of
determining the number of Shares a Record Date Shareholder may acquire pursuant
to the Offer, broker-dealers whose shares are held of record by Cede & Company,
Inc. ("Nominee"), nominee for The Depository Trust Company, or by any other
depository or nominee, will be deemed to be the holders of the Rights that are
issued to Nominee or such other depository or nominee on their behalf. Shares
acquired pursuant to the Over-Subscription Privilege are subject to allotment,
which is more fully discussed under "The Offer--Over-Subscription Privilege."
 
  The subscription price per share (the "Subscription Price") will be the
greater of (1) net asset value per share on July 29, 1998; or (2) 90% of the
average of the closing sale prices of a share of the Fund's Common Stock at the
close of business on July 29, 1998 and the four preceding business days. Since
the Expiration Date is prior to the Pricing Date, Record Date Shareholders who
choose to exercise their Rights will not know the Subscription Price at the
time they exercise such Rights. The steps for subscribing, including how to
pay, are specified below in "Steps to Subscribe."
 
  Rights will be evidenced by subscription certificates ("Subscription
Certificates") and may be exercised by completing a Subscription Certificate
and delivering it, together with payment, either by means of a notice of
guaranteed delivery or a check, to The Bank of New York, Church Street Station,
New York, New York (the "Subscription Agent"). A Rights holder will have no
right to rescind a purchase after the Subscription Agent has received the
holder's Subscription Certificate or notice of guaranteed delivery. See "The
Offer--Method of Exercise of Rights" and "The Offer--Payment for Shares." The
Rights are non-transferable. Only the shares issued pursuant to an exercise of
Rights, and not the Rights, will be listed on the NYSE.
 
IMPORTANT DATES TO REMEMBER
 
<TABLE>
<CAPTION>
         EVENT                                                 DATE
         -----                                                 ----
     <S>                                           <C>
     Record Date..................................                 June 29, 1998
     Subscription Period.......................... June 29 through July 28, 1998
     Expiration Date..............................                 July 28, 1998
     Pricing Date.................................                 July 29, 1998
     Confirmation to Participants.................                August 7, 1998
     Final Settlement for Shares..................               August 14, 1998
</TABLE>
 
                                       3
<PAGE>
 
 
STEPS TO SUBSCRIBE
 
  Complete, sign and date the enclosed Subscription Certificate. Write a check
or money order for $9.75 for each Share subscribed for through the Primary
Subscription and Over-Subscription Privilege. Mail the Subscription Certificate
and payment in the enclosed envelope to The Bank of New York.
 
  Alternatively, follow the instructions for the enclosed notice of guaranteed
delivery. If shares are held by your broker or other nominee, contact your
broker or other nominee.
 
INFORMATION REGARDING THE FUND
 
  The Fund has been engaged in business as a closed-end diversified management
investment company since January 13, 1987. The Fund's investment objective is
to seek a total investment return, comprised of current income and capital
appreciation, through investment principally in Convertible Securities (defined
in "Investment Objective and Policies--Convertible Securities") and use of
certain other investment techniques. No assurance can be given that the Fund's
investment objective will be achieved. See "Investment Objective and Policies."
The Fund's outstanding common stock, par value $.01 per share (the "Common
Stock"), is listed and traded on the NYSE under the symbol CVT. The average
weekly trading volume of the Common Stock on the NYSE during the 12 month
period ended December 31, 1997 was approximately 443,000 shares. As of December
31, 1997, the net assets of the Fund were approximately $355.1 million.
 
INFORMATION REGARDING THE INVESTMENT ADVISER
 
  The Fund's investment adviser, TCW Funds Management, Inc. ("Investment
Adviser"), has served as investment adviser to the Fund since its inception.
The Investment Adviser is a wholly-owned subsidiary of The TCW Group, Inc.
(formerly, TCW Management Company), whose direct and indirect subsidiaries
provide a variety of trust, investment management and investment advisory
services and had, as of December 31, 1997, approximately $50 billion of assets
under management and committed to management, of which approximately $1.4
billion were represented by investments in Convertible Securities. The Fund
pays the Investment Adviser a monthly fee computed at the annual rate of 0.75%
of the first $100 million of the Fund's average net assets, and 0.50% of the
Fund's average net assets in excess of $100 million. See "Investment Advisory
and Other Services--Fees and Expenses." Since the Investment Adviser's fees are
based on the Fund's average net assets, the Investment Adviser will benefit
from the Offer. In addition, a director who is an "interested person" of the
Fund could benefit indirectly from the Offer because of his interest in the
Investment Adviser. See "The Offer--Purposes of the Offer."
 
                                       4
<PAGE>
 
 
SPECIAL CONSIDERATIONS AND RISK FACTORS
 
  The following summarizes certain matters that should be considered, among
others, in connection with the Offer.

Dilution....................... As a result of the terms of the Offer,
                                shareholders who do not fully exercise their
                                Rights will, at the completion of the Offer,
                                own a smaller proportional interest in the Fund
                                than would otherwise be the case. Such
                                shareholders would also forego the opportunity
                                to purchase shares of the Fund at a discount
                                from market price if such market price remains
                                above net asset value at the end of the
                                offering period.
 
Discount From Net Asset Value.. The Fund's shareholders may dispose of their
                                Shares on the NYSE or other markets on which
                                the Shares may trade. Because the Fund is a
                                closed-end fund, the Fund's shareholders do not
                                have the right to redeem their Shares at net
                                asset value. The market price for shares of
                                closed-end investment companies varies from net
                                asset value and such shares frequently trade at
                                a discount from net asset value. The Fund's
                                shares have traded in the market at, above and
                                below net asset value since the commencement of
                                Fund's operations. During the past three years,
                                the Fund's shares have generally traded in the
                                market at a premium above net asset value.
 
Anti-Takeover Provisions....... Certain provisions of the Fund's Articles of
                                Incorporation may be regarded as "anti-
                                takeover" provisions. These provisions require
                                the affirmative vote or consent of the holders
                                of at least two-thirds of the outstanding
                                shares of the Fund for a merger or
                                consolidation of the Fund with an open-end
                                investment company, a merger or consolidation
                                of the Fund with a closed-end investment
                                company with different voting requirements,
                                dissolution of the Fund, a sale of all or
                                substantially all of the assets of the Fund or
                                an amendment to the Fund's Articles of
                                Incorporation making the Common Stock a
                                redeemable security or reducing the two-thirds
                                vote required by the Articles of Incorporation.
                                See "Description of Common Stock--Anti-Takeover
                                Provisions of the Articles of Incorporation."
 
Investments.................... Many Convertible Securities which the Fund
                                purchases are unrated or rated BB or lower by
                                Standard & Poor's Corporation or Ba or lower by
                                Moody's Investor's Service, Inc. Ratings below
                                BB/Ba are considered by the rating agencies to
                                be speculative and bonds with a rating of BB/Ba
                                or lower are commonly referred to as "junk
                                bonds." See "Investment Objective and
                                Policies--Risks of Lower Rated Securities."
                                Prices of Convertible Securities generally
                                fluctuate in response to changes in interest
                                rates as well as to changes in the prices of
                                the underlying common stocks. The Fund may
                                invest up to 15% of its net assets in illiquid
                                convertible securities. At December 31, 1997,
                                approximately 46% of the Fund's net assets were
                                invested
 
                                       5
<PAGE>
 
                                in restricted securities none of which were
                                deemed to be illiquid. See "Investment
                                Objectives and Policies--Unregistered
                                Convertible Securities." The Fund intends to
                                employ from time to time certain investment
                                techniques which involve additional risks.
                                These investment techniques include options,
                                short sales against the box, forward
                                commitments, lending of portfolio securities,
                                foreign securities and foreign issuers,
                                repurchase agreements, and stock index futures.
                                Each of these investment techniques and the
                                risks thereof are described under the caption
                                "Investment Objective and Policies" or in the
                                Statement of Additional Information.
 
Distributions.................  Since July, 1988, the Fund has made quarterly
                                distributions of $0.21 per share. These
                                distributions have required payments
                                substantially in excess of the Fund's current
                                net investment income. The portion, if any, of
                                a distribution which equals the Fund's current
                                net investment income should be considered a
                                dividend. The remainder constitutes a payment
                                out of the Fund's net realized capital gains
                                for each period to the extent available; any
                                excess is paid from paid-in capital. See
                                "Distributions; Dividend Reinvestment Plan."
 
                                       6
<PAGE>
 
                             FINANCIAL HIGHLIGHTS
 
  The information below for the fiscal years ended December 31, 1998 through
1997 has been audited by Deloitte & Touche LLP, independent auditors, as
stated in their report included in the Statement of Additional Information.
The following information should be read in conjunction with he financial
statements and related notes thereto included in the Statement of Additional
Information.
 
<TABLE>
<CAPTION>
                                                           YEAR ENDED DECEMBER 31,
                          ----------------------------------------------------------------------------------------------------
                            1997      1996      1995      1994       1993      1992      1991      1990       1989      1988
                          --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
<S>                       <C>       <C>       <C>       <C>        <C>       <C>       <C>       <C>        <C>       <C>
Net Asset Value Per
Share, Beginning of
Period..................  $   8.51  $   8.36  $   7.47  $   8.79   $   8.36  $   8.09  $   6.85  $   8.36   $   7.99  $   7.76
                          --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
Income from Operations:
 Net Investment Income..      0.35      0.36      0.37      0.38       0.40      0.41      0.43      0.46       0.50      0.55
 Impact to Capital for
 Shares Issued..........     (0.01)      --        --        --       (0.01)    (0.01)      --        --         --        --
 Net Realized and
 Unrealized Gain (loss)
 on Securities..........      1.23      0.77      1.36     (0.86)      1.25      0.71      1.65     (1.13)      0.71      0.44
                          --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
   Total from Investment
   Operations...........      1.57      1.13      1.73     (0.48)      1.64      1.11      2.08     (0.67)      1.21      0.99
Less Distributions:
 Dividends from Net
 Investment Income......     (0.35)    (0.36)    (0.37)    (0.38)     (0.40)    (0.41)    (0.43)    (0.46)     (0.50)    (0.55)
 Distribution from Net
 Realized Gains.........     (0.52)    (0.62)    (0.33)    (0.30)     (0.81)    (0.07)      --        --       (0.06)      --
 Distribution in Excess
 of Net Realized Gains..       --        --      (0.14)    (0.16)       --        --        --        --         --        --
 Return of Capital......       --        --        --        --         --      (0.36)    (0.41)    (0.38)     (0.28)    (0.21)
                          --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
   Total Distributions..     (0.87)    (0.98)    (0.84)    (0.84)     (1.21)    (0.84)    (0.84)    (0.84)     (0.84)    (0.76)
                          --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
Net Asset Value Per
Share, End of Period....  $   9.21  $   8.51  $   8.36  $   7.47   $   8.79  $   8.36  $   8.09  $   6.85   $   8.36  $   7.99
                          ========  ========  ========  ========   ========  ========  ========  ========   ========  ========
Per Share Market Price,
End of Period...........  $  9.625  $  9.375  $  9.375  $  7.750   $  9.250  $  9.125  $  8.750  $  6.875   $  8.000  $  7.375
                          ========  ========  ========  ========   ========  ========  ========  ========   ========  ========
Total Investment
Return(1)...............     12.98%    11.75%     33.6%    (7.43)%    13.77%    15.90%    41.38%    (3.78)%    20.23%    24.79%
Net Asset Value Total
Return(2)...............     19.10%    13.94%     24.0%    (5.70)%    16.12%    13.35%    31.20%    (8.25)%    15.97%    13.24%
Ratios/Supplemental
Data:
Net Assets, End of
Period (in thousands)...  $355,061  $271,267  $264,608  $234,686   $273,230  $215,208  $172,331  $144,593   $175,732  $167,797
Ratio of Expenses to
Average Net Assets......      0.74%     0.77%     0.81%     0.79 %     0.80%     0.88%     0.94%     0.94 %     0.95%     0.94%
Ratio of Net Investment
Income to Average Net
Assets..................      3.95%     4.12%     4.60%     4.66 %     4.48%     5.04%     5.68%     5.93 %     5.90%     6.66%
Portfolio Turnover Rate.    132.99%   125.72%   108.98%   110.04 %   173.79%   139.39%   114.13%    99.53 %    84.17%    70.62%
Average Commission Rate
Paid by the Fund(3).....  $   0.06  $   0.06       N/A       N/A        N/A       N/A       N/A       N/A        N/A       N/A
</TABLE>
- ----
(1) Based on market value per share, adjusted for reinvestment of
    distributions.
 
(2) Based on net asset value per share, adjusted for reinvestment of
    distributions.
 
(3) For fiscal years beginning on or after September 1, 1995, a fund is
    required to disclose its average commission rate per share for security
    trades on which commissions are charged. This amount may vary from period
    to period and fund to fund depending on the mix of trades executed in
    various markets where trading practices and commission rate structures may
    differ.
 
                                       7
<PAGE>
 
                                   THE OFFER
 
TERMS OF THE OFFER
 
  The Fund is issuing to Record Date Shareholders Rights to subscribe for the
Shares. Each Record Date Shareholder is being issued one non-transferable
Right for each share of Common Stock owned on the Record Date. The Rights
entitle the holder to acquire through the Primary Subscription at the
Subscription Price one Share for each five Rights held. No Rights will be
issued for fractional shares. Rights may be exercised at any time during the
Subscription Period, which commences on the date of this Prospectus and ends
at 5:00 p.m., New York City time, on July 28, 1998.
 
  In addition, any Record Date Shareholder who fully exercises all Rights
initially issued to him (other than those Rights which cannot be exercised
because they represent the right to acquire less than one Share) is entitled
to subscribe for Shares which were not subscribed for by other shareholders in
the Primary Subscription. For purposes of determining the maximum number of
Shares a Record Date Shareholder may acquire pursuant to the Offer, broker-
dealers whose shares are held of record by Nominee or by any other depository
or nominee will be deemed to be the holders of the Rights that are issued to
Nominee or such other depository or nominee on their behalf. Shares acquired
pursuant to the Over-Subscription Privilege are subject to allotment, which is
more fully discussed below under "Over-Subscription Privilege."
 
  Rights will be evidenced by Subscription Certificates. The number of Rights
issued to each holder will be stated on the Subscription Certificate delivered
to such holder. The method by which Rights may be exercised and Shares paid
for is set forth below in "Method of Exercise of Rights" and "Payment for
Shares." A Rights holder will have no right to rescind a purchase after the
Subscription Agent has received the holder's Subscription Certificate or
notice of guaranteed delivery. See "Payment for Shares" below. Shares issued
pursuant to an exercise of Rights will be listed on the NYSE.
 
  The Rights are non-transferable. Only the underlying Shares, and not the
Rights, will be admitted for trading on the NYSE. Since fractional Shares will
not be issued, Rights holders who receive, or who are left with, fewer than
five Rights will be unable to exercise such Rights and will not be entitled to
receive any cash in lieu of such fractional Shares. The Fund will not offer or
sell any Shares which are not subscribed through the Primary Subscription or
the Over-Subscription Privilege.
 
PURPOSES OF THE OFFER
 
  The Board of Directors of the Fund has determined that the Offer is in the
best interests of the Fund and its shareholders. The Offer will increase the
assets of the Fund available for investment thereby permitting the Fund to be
in a better position more fully to take advantage of investment opportunities
that may arise. The larger number of outstanding shares of Common Stock after
the Offer should help create a more efficient and active market for the Common
Stock and help reduce the effect on market price of individual transactions.
In addition, increasing the size of the Fund may lower the Fund's expenses as
a percentage of net assets. The Offer also seeks to reward the long-term
shareholder by giving existing shareholders the right to purchase additional
shares at a price that may be below market without incurring any commission
charge. There can be no assurance that the Fund will achieve any of the
foregoing objectives or benefits through the Offer.
 
  The purpose of setting the determination of the Subscription Price
subsequent to the Expiration Date is to insure that the Offer will attract the
maximum participation of shareholders with the minimum dilution to non-
participating shareholders.
 
  The Investment Adviser will benefit from the Offer because the Investment
Adviser's fee is based on the average net assets of the Fund. See "Investment
Advisory and Other Services--Fees and Expenses." It is not possible to state
precisely the amount of additional compensation the Investment Adviser will
receive as a result of the Offer because the proceeds of the Offer will be
invested in additional portfolio securities which will fluctuate in value.
However, assuming that all Rights are exercised and the Fund receives the
maximum proceeds
 
                                       8
<PAGE>
 
of the Offer, the annual compensation to be received by the Investment Adviser
would be increased by approximately 19% assuming the net asset value per share
of $9.21 as of December 31, 1997. Three of the Fund's eight directors who
voted to authorize the Offer are "interested persons" of the Fund and of the
Investment Adviser within the meaning of the 1940 Act. One of these Directors,
Mr. Ernest O. Ellison, could benefit indirectly from the Offer because of his
indirect ownership interest in the Investment Adviser. See "Management of the
Fund."
 
  The Fund may, in the future and at its discretion, choose to make additional
rights offerings from time to time for a number of shares and on terms which
may or may not be similar to the Offer. Any such future rights offering will
be made in accordance with the Investment Company Act of 1940, as amended
("1940 Act"). If all the Shares are subscribed for in this Offering, the Fund
will have a total of 3,642,836 remaining authorized but unissued shares of
Common Stock available for issuance without shareholder approval.
 
OVER-SUBSCRIPTION PRIVILEGE
 
  If some Record Date Shareholders do not exercise all of the Rights issued to
them, any Shares for which subscriptions have not been received from Record
Date Shareholders will be offered, by means of the Over-Subscription
Privilege, to those Record Date Shareholders who have exercised all the Rights
initially issued to them (other than those Rights which cannot be exercised
because they represent the right to acquire less than one Share) and who wish
to acquire more than the number of Shares for which the Rights issued to them
are exercisable. Record Date Shareholders who exercise all the Rights
initially issued to them will have the opportunity to indicate on the
Subscription Certificate how many Shares they are willing to acquire pursuant
to the Over-Subscription Privilege. If sufficient Shares remain after the
Primary Subscriptions have been exercised, all over-subscriptions will be
honored in full. If sufficient Shares are not available to honor all over-
subscriptions, the available Shares will be allocated among those who
oversubscribe based on the number of Rights originally issued to them by the
Fund. The percentage of remaining Shares each over-subscribing shareholder may
acquire will be rounded up or down to result in delivery of whole Shares. The
allocation process may involve a series of allocations in order to assure that
the total number of Shares available for over-subscriptions is distributed on
a pro rata basis.
 
THE SUBSCRIPTION PRICE
 
  The Subscription Price for the Shares to be issued pursuant to the Rights
will be the greater of (1) net asset value per Share at the close of business
on July 29, 1998 (the "Pricing Date"); or (2) 90% of the average of the
closing sale prices of a share of the Fund's Common Stock at the close of
business on July 29, 1998 and the four preceding business days.
 
  The Fund announced the Offer before the start of trading on the NYSE on
February 18, 1998. The net asset values per share of Common Stock at the close
of business on February 20, 1998 (two days following the announcement) and
June 26, 1998 were $9.66 and $9.47, respectively, and the last reported sale
prices of a share of the Fund's Common Stock on the NYSE on February 20, 1998
(two days following the announcement) and June 26, 1998 were $10.25 and $9.50,
respectively.
 
EXPIRATION OF THE OFFER
 
  The Offer will expire at 5:00 p.m., New York City time, on July 28, 1998.
Rights will expire on the Expiration Date and thereafter may not be exercised.
Since the Expiration Date is prior to the Pricing Date, Record Date
Shareholders who decide to acquire Shares in the Primary Subscription or
pursuant to the Over-Subscription Privilege will not know, when they make such
decision, the purchase price for such Shares.
 
                                       9
<PAGE>
 
SUBSCRIPTION AGENT
 
  The Subscription Agent is The Bank of New York, Church Street Station, New
York, New York. The Subscription Agent will receive from the Fund a fee
estimated to be $40,000 for the processing of the exercise of Rights and
reimbursement for all out-of-pocket expenses related to the Offer. The
Subscription Agent is also the Fund's dividend disbursing agent, transfer
agent and registrar.
 
INFORMATION AGENT
 
  Any questions or requests for assistance regarding how to subscribe for
Shares or for additional copies of this Prospectus or Subscription
Certificates or notices of guaranteed delivery may be directed to the
Information Agent at its telephone number and address listed below:
 
  CORPORATE INVESTOR COMMUNICATIONS, INC.
  111 COMMERCE ROAD
  CARLSTADT, NEW JERSEY 07072-2586
 
  Toll Free--1-888-501-9723
 
  The Information Agent will receive a fee estimated to be $9,500 and
reimbursement for all out-of-pocket expenses related to the Offer.
 
METHOD OF EXERCISE OF RIGHTS
 
  Rights may be exercised by filling in and signing the reverse side of the
Subscription Certificate and mailing it in the envelope provided. In addition,
Rights may be exercised by delivering the completed and signed Subscription
Certificate to the Subscription Agent, together with payment for the Shares as
described below under "Payment for Shares." Rights may also be exercised
through a Rights holder's broker, or other nominee if such shareholder's
shares of Common Stock are held in such broker's or nominee's name. Such
brokers or nominees may charge a servicing fee for exercising such Rights.
Fractional Shares will not be issued, and Rights holders who receive, or who
are left with, fewer than five Rights will not be able to exercise such
Rights.
 
  Completed Subscription Certificates must be received by the Subscription
Agent prior to 5:00 p.m., New York City time, on July 28, 1998 (unless payment
is effected by means of a notice of guaranteed delivery as described below
under "Payment for Shares"). The Subscription Certificate and payment should
be delivered to the offices of the Subscription Agent by one of the methods
described below:
 
(1) By mail:
    The Bank of New York
    Tender and Exchange Department
    P.O. Box 11248
    Church Street Station
    New York, New York 10286-1248
 
(2) By Hand, Express Mail or Overnight Courier:
    The Bank of New York
    Tender and Exchange Department
    101 Barclay Street
    Receive & Delivery Window-Street Level
    New York, New York 10286
 
                                      10
<PAGE>
 
PAYMENT FOR SHARES
 
  Holders of Rights who acquire Shares in the Primary Subscription or pursuant
to the Over-Subscription Privilege may choose between the following methods of
payment.
 
  (1) A subscription will be accepted by the Subscription Agent if, prior to
5:00 p.m., New York City time, on the Expiration Date, the Subscription Agent
has received a completed and executed notice of guaranteed delivery by
facsimile (telecopy) or otherwise from a bank, a trust company or a NYSE
member, guaranteeing delivery of (i) payment of the full Subscription Price
for the Shares subscribed for on Primary Subscription and any additional
Shares subscribed for pursuant to the Over-Subscription Privilege, and (ii) a
properly completed and executed Subscription Certificate. The Subscription
Agent will not honor a notice of guaranteed delivery if a properly completed
and executed Subscription Certificate and full payment is not received by the
Subscription Agent by the close of business on the third Business Day after
the Expiration Date. The notice of guaranteed delivery may be delivered to the
Subscription Agent in the same manner as Subscription Certificates at the
addresses set forth above, or may be transmitted to the Subscription Agent
together with a completed Subscription Certificate by facsimile transmission
(telecopy number (212) 815-6213; confirm by telephone (800) 507-9357.
 
  (2) Alternatively, a holder of Rights can send the Subscription Certificate
together with payment in the form of a check for the Shares acquired on
Primary Subscription and additional Shares subscribed for pursuant to the
Over-Subscription Privilege to the Subscription Agent based on an assumed
purchase price of $9.75 Share. To be accepted, payment, together with the
executed Subscription Certificate, must be received by the Subscription Agent
at its Tender and Exchange Department, P.O. Box 11248, Church Street Station,
New York, New York 10286-1248 or its Tender and Exchange Department, 101
Barclay Street, Receive and Deliver Window-Street Level, New York, New York
10286 prior to 5:00 p.m., New York City time, on the Expiration Date. The
Subscription Agent will deposit all stock purchase checks received by it prior
to the final due date into a segregated interest-bearing account (which
interest will accrue to the benefit of the Fund) pending proration and
distribution of Shares. Interest on this account will accrue to the benefit of
the Fund.
 
  A PAYMENT PURSUANT TO THIS METHOD MUST BE IN UNITED STATES DOLLARS BY MONEY
ORDER OR CHECK DRAWN ON A BANK LOCATED IN THE UNITED STATES. PAYMENT MUST BE
PAYABLE TO TCW CONVERTIBLE SECURITIES FUND, INC., AND MUST ACCOMPANY AN
EXECUTED SUBSCRIPTION CERTIFICATE FOR SUCH SUBSCRIPTION CERTIFICATE TO BE
ACCEPTED. THE SUBSCRIPTION AGENT WILL NOT ACCEPT CASH AS A MEANS OF PAYMENT
FOR SHARES.
 
  Within three Business Days following the Pricing Date (the "Confirmation
Date"), a confirmation will be sent by the Subscription Agent to each holder
of Rights (or, if the Fund's shares are held by Nominee or any other
depository or nominee, to Nominee or such other depository or nominee),
showing (1) the number of Shares acquired pursuant to the Primary
Subscription, (2) the number of Shares, if any, acquired pursuant to the Over-
Subscription Privilege, (3) the per Share and total purchase price for the
Shares, and (4) any additional amount payable by such holder to the Fund or
any excess to be refunded by the Fund to such holder, in each case based on
the Subscription Price as determined on the Pricing Date. If any such
shareholder exercises his right to acquire Shares pursuant to the Over-
Subscription Privilege, any such excess payment which would otherwise be
refunded to him will be applied by the Fund toward payment for Shares acquired
pursuant to exercise of the Over-Subscription Privilege. Any payment required
from a holder of Rights must be received by the Subscription Agent within ten
Business Days after the Confirmation Date. Any excess payment to be refunded
by the Fund to a holder of Rights, or to be paid to a holder of Rights as a
result of exercises by Record Date Stockholders of their Over-Subscription
Privileges will be mailed by the Subscription Agent to him within fifteen
Business Days after the Confirmation Date. All payments by a holder of Rights
must be in United States dollars by money order or check drawn on a bank
located in the United States of America and payable to TCW Convertible
Securities Fund, Inc.
 
 
                                      11
<PAGE>
 
  Whichever of the two methods described above is used, issuance and delivery
of certificates for the Shares purchased are subject to collection of any
checks or money orders and actual payment pursuant to any notice of guaranteed
delivery.
 
  A Rights holder will have no right to rescind a purchase after the
Subscription Agent has received payment, either by means of a notice of
guaranteed delivery or a check.
 
  If a holder of Rights who acquires Shares pursuant to the Primary
Subscription or the Over-Subscription Privilege does not make payment of any
amounts due, the Fund reserves the right to take any or all of the following
actions: (1) find other purchasers for such subscribed-for and unpaid-for
Shares; (2) apply any payment actually received by it toward the purchase of
the greatest whole number of Shares which could be acquired by such holder
upon exercise of the Primary Subscription and/or the Over-Subscription
Privilege, and/or (3) exercise any and all other rights or remedies to which
it may be entitled, including, without limitation, the right to set off
against payments actually received by it with respect to such subscribed
Shares and to enforce the relevant guaranty of payment.
 
  Holders who hold shares of Common Stock for the account of others, such as
brokers, trustees or depositaries for securities, should notify the respective
beneficial owners of such shares as soon as possible to ascertain such
beneficial owners' intentions and to obtain instructions with respect to the
Rights. If the beneficial owner so instructs, the record holder of such Rights
should complete Subscription Certificates and submit them to the Subscription
Agent with the proper payment. In addition, beneficial owners of Common Stock
or Rights held through such a holder should contact the holder and request the
holder to effect transactions in accordance with the beneficial owner's
instructions.
 
  The instructions accompanying the Subscription Certificates should be read
carefully and followed in detail. DO NOT SEND SUBSCRIPTION CERTIFICATES OR
PAYMENTS TO THE FUND.
 
  THE METHOD OF DELIVERY OF SUBSCRIPTION CERTIFICATES AND PAYMENT OF THE
SUBSCRIPTION PRICE TO THE SUBSCRIPTION AGENT WILL BE AT THE ELECTION AND RISK
OF THE RIGHTS HOLDERS, BUT IF SENT BY MAIL IT IS RECOMMENDED THAT SUCH
CERTIFICATES AND PAYMENTS BE SENT BY REGISTERED MAIL, PROPERLY INSURED, WITH
RETURN RECEIPT REQUESTED, AND THAT A SUFFICIENT NUMBER OF DAYS BE ALLOWED TO
ENSURE DELIVERY TO THE SUBSCRIPTION AGENT AND CLEARANCE OF PAYMENT PRIOR 5:00
P.M., NEW YORK CITY TIME, ON THE EXPIRATION DATE. BECAUSE UNCERTIFIED PERSONAL
CHECKS MAY TAKE SEVERAL BUSINESS DAYS TO CLEAR, YOU ARE STRONGLY URGED TO PAY,
OR ARRANGE FOR PAYMENT, BY MEANS OF CERTIFIED OR CASHIER'S CHECK OR MONEY
ORDER.
 
  All questions concerning the timeliness, validity, form and eligibility of
any exercise of Rights will be determined by the Fund, whose determination
will be final and binding. The Fund in its sole discretion may waive any
defect or irregularity, or Permit a defect or irregularity to be corrected
within such time as it may determine, or reject the purported exercise of any
Right. Subscriptions will not be deemed to have been received or accepted
until all irregularities have been waived or cured within such time as the
Fund determines in its sole discretion. Neither the Fund nor the Subscription
Agent will be under any duty to give notification of any defect or
irregularity in connection with the submission of Subscription Certificates or
incur any liability for failure to give such notification.
 
NOTICE OF NET ASSET VALUE DECLINE
 
  The Fund has undertaken, as required by the Securities and Exchange
Commission's registration form, to suspend the Offer until it amends this
Prospectus if subsequent to June 30, 1998, the effective date of the Fund's
registration statement relating to the Offering, and prior to the Expiration
Date, the Fund's net asset value declines more than 10% from its net asset
value as of June 30, 1998. In such event, the Fund will notify shareholders of
any such decline and permit them to cancel their exercise of Rights. With this
exception, a
 
                                      12
<PAGE>
 
shareholder will have no right to rescind an exercise of Rights after the
Subscription Agent receives a Subscription Certificate or notice of guaranteed
delivery.
 
PURCHASE AND SALE OF RIGHTS
 
  The Rights are non-transferable and, therefore, may not be purchased or
sold. The Rights will not be admitted to trading on the NYSE. However, the
Shares to be issued pursuant to the Rights will be listed and admitted to
trading, along with the existing outstanding shares of Common Stock, on the
NYSE.
 
DELIVERY OF STOCK CERTIFICATES
 
  Participants in the Fund's Dividend Reinvestment Plan (the "Plan") will have
their Shares acquired on Primary Subscription and pursuant to the Over-
Subscription Privilege credited to their shareholder distribution reinvestment
accounts in the Plan, unless they request the issuance of stock certificates
for the Shares so acquired. Shareholders whose Shares are held of record by
Nominee or by any other depository or nominee on their behalf or their broker-
dealers' behalf will have their Shares acquired on Primary Subscription and
pursuant to the Over-Subscription Privilege credited to the account of Nominee
or such other depository or nominee. With respect to all other shareholders,
stock certificates for all Shares acquired on Primary Subscription and
pursuant to the Over-Subscription Privilege will be mailed within fifteen
business days after the Confirmation Date and after payment for the Shares
subscribed for has cleared.
 
FOREIGN SHAREHOLDERS
 
  The Fund has been advised by outside legal counsel that this rights offering
has been qualified or is believed to be exempt from qualification only under
the federal laws of the United States and the laws of each of the States in
the United States. Residents of other jurisdictions may not purchase the
Shares of Common Stock offered hereby unless they certify that their purchases
of such Shares are effected in accordance with the applicable laws of such
jurisdictions.
 
FEDERAL INCOME TAX CONSEQUENCES
 
  For Federal income tax purposes, neither the receipt nor the exercise of the
Rights will result in taxable income to holders of Common Stock, and no loss
or deduction will be allowed if Rights expire without being exercised.
 
  A shareholder's holding period for a Share acquired upon exercise of a Right
begins on the date of exercise. In the absence of a special election under
Section 307 of the Internal Revenue Code of 1986 by the shareholder, the
shareholder's basis for determining gain or loss upon the sale of a Share
acquired upon exercise of a Right will be equal to the Subscription Price. A
shareholder's gain or loss recognized upon a sale of that Share will be
capital gain or loss if the Share was held as a capital asset at the time of
sale. Net capital gains are subject to a maximum tax rate of 20% so long as
the asset was held for more than eighteen (18) months. Gains on assets held no
more than eighteen months but more than one year, are subject to a tax at a
maximum rate of 28%.
 
  The foregoing discussion is for general information only and is based upon
existing laws, regulations and judicial and administrative pronouncements.
Shareholders are advised to consult their own tax advisers with regard to the
Federal income tax consequences of exercising any Rights, as well as the tax
consequences arising under the laws of any state, foreign country or other
jurisdiction.
 
DILUTION
 
  As a result of the terms of the Offer, shareholders who do not fully
exercise their Rights will, at the completion of the Offer, own a smaller
proportional interest in the Fund than would otherwise be the case. Such
shareholders would also forego the opportunity to purchase shares of the Fund
at a discount from market price if such market price remains above net asset
value at the end of the offering period.
 
                                      13
<PAGE>
 
                    SPECIAL CONSIDERATIONS AND RISK FACTORS
 
MARKET PRICE PREMIUM OR DISCOUNT FROM NET ASSET VALUE
 
  Shares of the Fund are listed and traded on the NYSE. Since the Fund is a
closed-end investment company, shareholders do not have the right to redeem
shares at net asset value. The market price for shares of closed-end
investment companies generally varies from per share net asset value and such
shares frequently trade at a discount from net asset value. Shares of the Fund
have traded at, above and below net asset value since the commencement of
operations. Prior to 1990, the Fund's shares generally traded at a discount
from the net asset value. During the past three years, the Fund's shares have
generally traded at a premium above net asset value. See "Share Price Data."
To the extent that shares trade at a premium above net asset value, a
reduction in such premium or a change from a premium to a discount would
adversely affect an investor's return.
 
ANTI-TAKEOVER PROVISIONS
 
  Certain provisions of the Fund's Articles of Incorporation may be regarded
as "anti-takeover" provisions. These provisions require the affirmative vote
or consent of the holders of at least two-thirds of the outstanding shares of
the Fund for a merger or consolidation of the Fund with an open-end investment
company, a merger or consolidation of the Fund with a closed-end investment
company with different voting requirements, dissolution of the Fund, a sale of
all or substantially all of the assets of the Fund or an amendment to the
Fund's Articles of Incorporation making the Common Stock a redeemable security
or reducing the two-thirds vote required by the Articles of Incorporation. See
"Description of Common Stock--Anti-Takeover Provisions of the Articles of
Incorporation."
 
INVESTMENTS
 
  Many Convertible Securities which the Fund purchases are unrated or rated BB
or lower by S&P or Ba or lower by Moody's. Ratings below BB/Ba are considered
by the rating agencies to BE SPECULATIVE and bonds with a rating of BB/Ba or
lower are commonly referred to as "junk bonds." See "Investment Objective and
Policies--Risks of Lower Rated Securities." Prices of Convertible Securities
generally fluctuate in response to changes in interest rates as well as to
changes in the prices of the underlying common stocks. The Fund may use
certain investment techniques which involve additional risks. These investment
techniques include options, short sales against the box, forward commitments,
lending of portfolio securities, investment in foreign securities and foreign
issuers, repurchase agreements, and stock index futures.
 
DISTRIBUTIONS
 
  Commencing in July, 1988, the Fund has made quarterly distributions of $0.21
per share. These distributions have required payments substantially in excess
of the Fund's current net investment income. The portion, if any, of a
distribution which equals the Fund's current net investment income should be
considered a dividend. The remainder constitutes a payment out of the Fund's
net realized capital gains for each period to the extent available; any excess
will be from paid-in capital. See "Distributions; Dividend Reinvestment Plan."
 
YEAR 2000
 
  The management and custodial services provided to the Fund by the Investment
Adviser and the Fund's custodian and the services provided to shareholders by
the Fund's transfer agent, depend on the continued functioning of their
computer systems. Many computer systems in use today cannot recognize the year
2000, but will revert to 1900 or 1980 or will cease to function due to the
manner in which dates were encoded and are calculated. That failure could have
a negative impact on the handling of the Fund's securities trades, its share
pricing and its account services. The Investment Adviser, custodian and
transfer agent have been actively working on necessary changes to their own
computer systems to deal with the year 2000 and expect that their systems will
be adopted before that date, but there can be no assurance that they will be
successful. Furthermore, services may be impaired at that time as a result of
the interaction of their systems with others' noncomplying computer systems.
 
                                      14
<PAGE>
 
                                USE OF PROCEEDS
 
  The net proceeds of the Offer, assuming all Shares offered hereby are sold,
are estimated to be approximately $75,000,000, based upon an assumed
Subscription Price of $9.75 and after deducting expenses payable by the Fund
estimated at approximately $200,000. If less than all of the Shares offered
are sold, the proceeds from the Offer would be reduced accordingly, but there
would be no material reduction in the expenses of the Offer. The Fund will
invest the net proceeds of the Offer in accordance with its investment
objective and policies. The Investment Adviser anticipates that such
investment will not take more than three months from the Expiration Date.
 
                          DESCRIPTION OF COMMON STOCK
 
GENERAL
 
  The Fund, which was incorporated under the laws of the State of Maryland on
January 13, 1987, is authorized to issue 50,000,000 shares of Common Stock,
par value $.01 per share. The shares of Common Stock have no preemptive,
conversion, exchange or redemption rights. Each share has equal voting,
dividend, distribution and liquidation rights. The shares outstanding are
fully paid and non-assessable. Shareholders are entitled to one vote per
share. All voting rights for the election of directors are non-cumulative.
 
  The following chart shows the number of shares of Common Stock authorized
and outstanding as of December 31, 1997:
 
<TABLE>
<CAPTION>
                                                       SHARES HELD
                                            SHARES     BY THE FUND     SHARES
   TITLE OF CLASS                         AUTHORIZED FOR ITS ACCOUNT OUTSTANDING
   --------------                         ---------- --------------- -----------
   <S>                                    <C>        <C>             <C>
   Common Stock $.01 par value........... 50,000,000         0       38,561,279
</TABLE>
 
SHARE PRICE DATA
 
  The Fund's shares are listed and traded on the New York Stock Exchange (the
"NYSE"). The following table sets forth for the quarters indicated the high
and low sale prices on the NYSE and the average weekly volume of trading of
the Fund's shares for the quarter. Also set forth are the related net asset
values per share of Common Stock, as calculated for such day or for the
preceding Friday business day by TCW Funds Management, Inc. (the "Investment
Adviser"), and the premium (or discount) to net asset value represented by
such market prices.
 
<TABLE>
<CAPTION>
                                             NET ASSET
                                  MARKET       VALUE       PREMIUM
                                   PRICE    RELATED TO  (OR DISCOUNT)    AVERAGE
                                ----------- ----------- --------------   WEEKLY
             QUARTER            HIGH   LOW  HIGH   LOW   HIGH    LOW     TRADING
              ENDED             PRICE PRICE PRICE PRICE PRICE   PRICE    VOLUME
             -------            ----- ----- ----- ----- ------  ------   -------
   <S>                          <C>   <C>   <C>   <C>   <C>     <C>      <C>
   03/31/95.................... 8.500 7.750 7.62  7.47   11.55%   3.75 % 150,962
   06/30/95.................... 8.750 8.125 8.22  7.79    6.45%   4.30 % 147,885
   09/30/95.................... 8.875 8.250 8.67  8.23    2.36%   0.24 % 151,854
   12/31/95.................... 9.500 8.500 8.53  8.39   11.37%   1.31 % 207,385
   03/31/96.................... 9.500 9.000 8.70  8.75    9.20%   2.86 % 179,923
   06/30/96.................... 9.000 8.375 8.78  8.79    2.51%  (4.72)% 307,323
   09/30/96.................... 9.375 8.625 8.82  8.20    6.29%   5.18 % 193,608
   12/31/96.................... 9.750 9.125 8.78  8.75   11.05%   4.29 % 162,269
   03/31/97.................... 9.900 9.000 8.88  8.30   13.51%   5.42 %  70,729
   06/30/97.................... 9.050 8.400 8.97  8.05    7.76%  (3.63)% 129,705
   09/30/97.................... 9.650 9.031 9.56  8.88    4.06%  (0.38)%  95,093
   12/31/97.................... 9.725 9.212 9.62  9.17    4.62%  (1.25)%  66,748
</TABLE>
 
                                      15
<PAGE>
 
  The Fund's shares have traded in the market above, at and below net asset
value since the commencement of the Fund's operations. Prior to 1990, shares
of the Fund's Common Stock generally traded at a discount from the net asset
value; however, in the last three calendar years, the Fund's shares have
generally traded in the market at a premium above net asset value.
 
  For the net asset value per share and the reported sales price of a share of
the Fund's Common Stock on the NYSE as of a recent date, see "The Offer--The
Subscription Price."
 
REPURCHASE OF SHARES
 
  The Fund's shareholders do not have the right to require redemption of their
shares by the Fund. The Fund, however, may repurchase its shares in the open
market from time to time, although nothing herein shall be considered a
commitment to repurchase such shares. Any such repurchases shall be subject to
the Maryland General Corporation Law and to limitations imposed by the
Investment Company Act of 1940 (the "1940 Act"). Subject to the Fund's
investment restriction with respect to borrowings, the Fund may incur debt in
an amount not exceeding 5% of total assets to finance share repurchase
transactions. See "Investment Objective and Policies--Investment
Restrictions." Shares repurchased by the Fund will be held as treasury shares
until reissued.
 
  The Fund does not expect to consider the repurchase of any of its shares
except at a price below net asset value. Consequently, so long as shares of
the Fund trade at a premium above net asset value, no offer to repurchase is
contemplated. If the Fund should in the future repurchase any shares at a
price below their net asset value, the net asset value of those shares that
remain outstanding will be increased, although the market price of those
outstanding shares will not necessarily be affected, either positively or
negatively. The principal factors expected to be considered by the Board of
Directors in determining whether any repurchase, compared to alternative
investments, is in the best interests of the Fund and its shareholders is the
anticipated effect on net asset value per share and the resulting effect on
the Fund's expense ratio. If the Fund should borrow to finance share
repurchase transactions, any gain in the value of the Fund's investments
during the term of the borrowing that exceeds the interest paid on the amount
borrowed would cause the net asset value of the Fund's shares to increase more
rapidly than would otherwise be the case. Conversely, any decline in the value
of the Fund's investments would cause the net asset value of the Fund's shares
to decrease more rapidly than would otherwise be the case. The Fund has never
repurchased any of its outstanding shares and does not presently contemplate
making any share repurchases nor incurring debt to finance any share
repurchases.
 
ANTI-TAKEOVER PROVISIONS OF THE ARTICLES OF INCORPORATION
 
  The Fund has provisions in its Articles of Incorporation that could have the
effect of limiting the ability of other entities or persons to acquire control
of the Fund, to cause it to engage in certain transactions or to modify its
structure. The affirmative vote or consent of the holders of at least two-
thirds of the outstanding shares of the Fund is required to authorize any of
the following actions: (1) merger or consolidation of the Fund with an open-
end investment company; (2) merger or consolidation with a closed-end
investment company unless such company's charter has the same voting
requirements; (3) dissolution of the Fund; (4) sale of all or substantially
all of the assets of the Fund; or (5) amendment to the Articles of
Incorporation of the Fund which makes the Common Stock a redeemable security
(as such term is defined in the 1940 Act) or which reduces the two-thirds vote
required to authorize the actions in (1) through (5) hereof.
 
  Reference is made to the Articles of Incorporation of the Fund, on file with
the Securities and Exchange Commission (the "SEC"), for the full text of these
provisions. These provisions could have the effect of depriving shareholders
of an opportunity to sell their shares at a premium over prevailing market
prices by discouraging a third party from seeking to obtain control of the
Fund in a tender offer or similar transaction.
 
                                      16
<PAGE>
 
  The Board of Directors has determined that the two-thirds voting
requirements described above, which are greater than the minimum requirements
under Maryland law or the 1940 Act, are in the best interests of the Fund and
its shareholders generally.
 
POSSIBLE FUTURE CONVERSION TO OPEN-END INVESTMENT COMPANY
 
  If shares of the Fund's Common Stock have traded on the principal securities
exchange where listed at an average discount from net asset value of more than
10%, determined on the basis of the discount as of the end of the last trading
day in each week during the period of 12 calendar weeks preceding December 31
in any year, the Fund will submit to its shareholders at the next succeeding
annual meeting of shareholders a proposal, to the extent consistent with the
1940 Act, to amend the Fund's Articles of Incorporation to provide that, upon
the adoption of such amendment by the holders of two-thirds of the Fund's
outstanding shares of Common Stock, the Fund will convert from a closed-end to
an open-end investment company. If the Fund converted to an open-end
investment company, it would be able to continuously issue and offer for sale
shares of its Common Stock. Also, each share of the Fund's Common Stock could
be presented to the Fund at the option of the holder thereof for redemption at
net asset value per share and the Fund could be required to liquidate
portfolio securities to meet requests for redemption. In addition, shares of
the Fund would no longer be listed on the NYSE.
 
  As described above, the Fund may repurchase its shares in the open market
from time to time. The Fund cannot predict whether any such repurchases would
increase or decrease the discount from net asset value. To the extent that any
such repurchase decreased the discount to below 10% during the measurement
period, the Fund would not be required to submit to shareholders a proposal to
convert the Fund to an open end investment company at the next annual meeting
of shareholders.
 
                       INVESTMENT OBJECTIVE AND POLICIES
 
GENERAL
 
  The investment objective of the Fund is to seek total investment return
comprised of current income and capital appreciation through investment
principally in Convertible Securities (defined in "Convertible Securities"
below) and use of certain other investment techniques. The Fund is designed
primarily for long-term investment and not as a trading vehicle. There can be
no assurance that the Fund's objective will be achieved.
 
  The Fund's investment objective and fundamental policies may be changed only
with the approval of the holders of a majority of the Fund's outstanding
voting securities. A "majority of the Fund's outstanding voting securities,"
when used in this Prospectus, means the lesser of (1) 67% of the shares
represented at a meeting at which more than 50% of the outstanding shares are
present in person or represented by proxy, or (2) more than 50% of the
outstanding shares.
 
  The Fund has adopted a fundamental policy that under normal market
conditions it will invest at least 65% of its total assets in Convertible
Securities. Securities obtained upon the conversion of convertible securities
may be retained during periods when market conditions are unfavorable for
their disposition. Securities received upon conversion also may be retained in
the Fund's portfolio to permit orderly disposition or to establish long-term
holding periods for Federal income tax purposes during years in which such
gains are accorded favorable tax treatment. For temporary periods of not
greater than two months after conversion, such securities will be considered
to be convertible securities for purposes of computing whether 65% of the
Fund's total assets are invested in Convertible Securities. The Fund would
convert a Convertible Security which it holds when necessary to permit orderly
disposition of the investment when a Convertible Security reaches maturity or
has been called for redemption. Conversion could also occur to facilitate a
sale of the position or if the dividend rate on the underlying common stock
increased above the yield on the Convertible Security.
 
                                      17
<PAGE>
 
  The remainder of the Fund's total assets may be invested in other
securities, including nonconvertible equity and investment grade debt
securities, options (as described below), securities issued or guaranteed by
the United States Government, its agencies and instrumentalities ("Government
Securities"), repurchase agreements (as described below), and money market
securities (as described below). Investment grade debt securities are those
rated Baa or higher by Moody's Investors Service, Inc. ("Moody's") or BBB or
higher by Standard & Poor's Corporation ("S&P"). Debt securities rated Baa by
Moody's are considered medium grade obligations with speculative
characteristics. United States Government agencies or instrumentalities
include, but are not limited to, the Federal National Mortgage Association,
the Government National Mortgage Association, and the Federal Home Loan
Mortgage Corporation.
 
  The Fund may invest in certain "hybrid securities" consisting of debt
obligations with an investment return coupled to the performance of a common
stock index, such as the Standard & Poor's 500 Composite Stock Price Index or
the Standard & Poor's Pharmaceutical Index. Such hybrid securities are usually
zero coupon obligations payable at maturity at the higher of (1) face value or
(2) face value multiplied by the value of the specified index at maturity and
divided by a specified amount which may be 110% to 120% of the value of the
index at the date of issue. These hybrid securities will be purchased by the
Fund only if the debt obligation is investment grade. In addition to the
credit risk of the issuer, the investment is subject to loss of value in the
event the index declines. The Fund does not intend to invest more than 5% of
its total assets in such hybrid securities.
 
  In selecting Convertible Securities for the Fund, the following factors,
among others, are considered by the Investment Adviser: (1) the Investment
Adviser's own evaluations of the creditworthiness of the issuer of the
securities; (2) the interest or dividend income generated by the securities;
(3) the potential for capital appreciation of the securities and the
underlying common stock; (4) the prices of the securities relative to the
underlying common stocks; (5) the prices of the securities relative to other
comparable securities; (6) whether the securities are entitled to the benefits
of sinking funds or other protective conditions; (7) diversification of the
Fund's portfolio as to issuers; and (8) whether the securities are rated by
S&P and/or Moody's and, if so, the ratings assigned.
 
  When business or financial conditions warrant, the Fund may take a temporary
"defensive" position by investing up to 100% of its total assets in (1)
Government Securities; (2) money market securities such as certificates of
deposit, bankers' acceptances and interest-bearing savings deposits of banks
having total assets of more than $5 billion and which are members of the
Federal Deposit Insurance Corporation, and commercial paper rated Prime 1 by
Moody's or A-l by S&P or, if not rated, issued by companies which have an
outstanding debt issue rated Aa or higher by Moody's or AA or higher by S&P;
(3) other debt securities rated Aa or higher by Moody's or AA or higher by
S&P; and (4) repurchase agreements as described below.
 
CONVERTIBLE SECURITIES
 
  A Convertible Security is a bond, debenture, note, preferred stock or other
security that may be converted into or exchanged for a prescribed amount of
common stock of the same or a different issuer within a particular period of
time at a specified price or formula.
 
  A Convertible Security entitles the holder to receive interest paid or
accrued on debt or the dividend paid on preferred stock until the Convertible
Security matures or is redeemed, converted or exchanged. Before conversion,
Convertible Securities have characteristics similar to non-convertible debt
securities in that they ordinarily provide a stable stream of income with
generally higher yields than those of common stocks of the same or similar
issuers. Convertible Securities rank senior to common stock in a corporation's
capital structure and, therefore, generally entail less risk than the
corporation's common stock, although the extent to which such risk is reduced
depends in large measure upon the degree to which the Convertible Security
sells above its value as a fixed income security.
 
  The value of a Convertible Security is a function of its "investment value"
(determined by its yield in comparison with the yields of other securities of
comparable maturity and quality that do not have a conversion
 
                                      18
<PAGE>
 
privilege), and its "conversion value" (the security's worth, at market value,
if converted into the underlying common stock).
 
  The investment value of a Convertible Security is influenced by changes in
interest rates, with investment value declining as interest rates increase and
increasing as interest rates decline. The credit standing of the issuer and
other factors may also have an effect on the Convertible Security's investment
value. The conversion value of a Convertible Security is determined by the
market price of the underlying common stock. If the conversion value is low
relative to the investment value, the price of the Convertible Security is
governed principally by its investment value. To the extent the market price
of the underlying common stock approaches or exceeds the conversion price, the
price of the Convertible Security will be increasingly influenced by its
conversion value. In addition, a Convertible Security generally will sell at a
premium over its conversion value determined by the extent to which investors
place value on the right to acquire the underlying common stock while holding
a fixed income security.
 
  A Convertible Security may be subject to redemption at the option of the
issuer at a price established in the Convertible Security's governing
instrument. If a Convertible Security held by the Fund is called for
redemption, the Fund will be required to permit the issuer to redeem the
security, convert it into the underlying common stock or sell it to a third
party. Any of these actions could have an adverse effect on the Fund's ability
to achieve its investment objective. The Fund has from time to time acquired
privately negotiated securities issued by a major brokerage firm and
consisting of notes with detachable warrants to purchase shares of publicly-
traded common stock. These investments are designed to permit the Fund to have
an interest in common stocks of companies which are considered attractive by
the Investment Adviser but which do not have outstanding Convertible
Securities. The combination of notes and warrants produces investment
characteristics similar to those of conventional convertible securities. These
instruments are normally unsecured obligations, and thus subject to the credit
risks of the issuing brokerage firm. In addition, they are normally
unregistered securities subject to the risks described below under
"Unregistered Convertible Securities." The Investment Adviser may acquire
similar "synthetic" or "derivative" instruments or combinations of instruments
that it believes possess properties comparable to those of standard
convertible securities and are consistent with the Fund's objectives. In
deciding whether and on what terms to acquire any such instruments, the
Investment Adviser weighs the risks against the expected total returns and
considers substantially the same factors described above with respect to the
evaluation of convertible securities generally. Synthetic convertible
securities are not included as Convertible Securities in determining whether
65% of the Fund's total assets are invested in Convertible Securities.
 
UNREGISTERED CONVERTIBLE SECURITIES
 
  The Fund may invest up to 15% of its total assets in illiquid unregistered
Convertible Securities. There is no percentage limitation on investments in
unregistered convertible securities which are determined to be liquid.
Unregistered securities are securities that have been sold in the United
States without registration under the Securities Act of 1933 and, as a result,
are subject to restrictions on resale. Unregistered securities generally may
be resold only in a privately negotiated transaction with a limited number of
purchasers or in a public offering registered under the Securities Act of
1933. Considerable delay could be encountered in either event. These
difficulties and delays may result in the Fund not being able to realize a
favorable price upon disposition of unregistered securities, and in some cases
might make disposition of such unregistered securities at the time desired by
the Fund impossible. In those instances where the Fund determines to have
unregistered securities held by it registered prior to sale and the Fund does
not have a contractual commitment from the issuer or seller to pay the costs
of such registration, the gross proceeds from the sale of the securities would
be reduced by the registration costs and underwriting discounts in the event
of a public offering. When unregistered Convertible Securities are converted
into common stock and the common stock is publicly traded (as is typically the
case), such common stock normally may be resold beginning one year following
the acquisition of the unregistered Convertible Securities, subject to the
volume limitations and certain other conditions of Rule 144 under the
Securities Act of 1933. Beginning two years after the acquisition of the
unregistered Convertible Securities, the common stock received upon conversion
ordinarily may be resold without restriction. The Fund may not invest more
than 15% of its total assets (determined at the time of investment) in
illiquid securities, including repurchase agreements with maturities in excess
of seven days.
 
                                      19
<PAGE>
 
  Rule 144A has been adopted by the SEC to provide a "safe harbor" for the
resale of certain unregistered securities among qualified institutional
investors without registration under the Securities Act of 1933. In its
release announcing the adoption of Rule 144A, the SEC indicated that a
principal purpose for the Rule is to achieve a more liquid and efficient
resale market for unregistered securities. Unregistered securities eligible
for resale pursuant to Rule 144A which the Board of Directors or the
Investment Adviser has determined under Board-approved guidelines to be liquid
are excluded from the 15% limitation on the Fund's investments in restricted
and other illiquid securities. At December 31, 1997, 46% of the Fund's net
assets were invested in restricted securities determined to be liquid and none
of the Fund's net assets were invested in restricted securities considered to
be illiquid.
 
RISKS OF LOWER-RATED SECURITIES
 
  Convertible Securities are generally not investment grade. This means they
are not rated within the four highest categories by S&P or Moody's. Appendix A
to this Prospectus contains a description of the S&P and Moody's ratings. To
the extent that Convertible Securities or other debt securities acquired by
the Fund are rated lower than investment grade or are not rated, there is a
greater risk as to the timely repayment of the principal of, and timely
payment of interest or dividends on, such securities. The Fund will purchase
Convertible Securities and other debt securities rated BB or lower by S&P or
Ba or lower by Moody's. Debt securities rated BB or lower by S&P or Ba or
lower by Moody's are considered to be speculative and are commonly referred to
as "junk bonds." Decisions to purchase and sell these securities are based on
the Investment Adviser's evaluation of their investment potential and risks
and not on the ratings assigned by credit agencies. Because investment in
lower-rated securities involves greater investment risk, the Fund's
performance may depend to a significant degree on the Investment Adviser's
investment analysis, including its analysis of the equity characteristics of
the underlying common stocks. Although the growth of the market for lower-
rated securities in the 1980s and 1990s has paralleled a long economic
expansion, some issuers have been affected by adverse market or economic
conditions. Lower-rated securities may be more susceptible to real or
perceived adverse economic and competitive industry conditions than investment
grade securities. A projection of an economic downturn, for example, could
cause a decline in prices of lower-rated securities because the advent of a
recession could lessen the ability of a highly leveraged company to make
principal and interest payments on its senior securities. In addition, the
secondary trading market for lower-rated securities may be less liquid than
the market for higher grade securities. The limited liquidity of the market
may also adversely affect the ability of the Fund's Directors to arrive at a
fair value for certain securities at times and could make it difficult for the
Fund to sell certain securities.
 
  Prices of lower-rated fixed income securities may decline rapidly in the
event a significant number of holders decide to sell. Changes in expectations
regarding an issuer, an industry or lower-rated securities generally could
reduce market liquidity for such securities and make their sale by the Fund
more difficult, at least in the absence of price concessions. An economic
downturn or an increase in interest rates could severely disrupt the market
for high yield bonds and adversely affect the value of outstanding bonds and
the ability of the issuers to repay principal and interest, meet projected
business goals and obtain additional financing. Where it deems it appropriate
and in the best interests of the Fund shareholders, the Fund may incur
additional expenses to seek recovery on a debt security on which the issuer
has defaulted and to pursue litigation to protect the interests of security
holders of its portfolio companies.
 
  While credit ratings are only one factor the Investment Adviser reviews in
evaluating lower-rated debt securities, certain risks are associated with
using credit ratings. Credit rating agencies may fail to timely change the
credit ratings to reflect subsequent events; however, the Investment Adviser
continuously monitors the issuers of lower-rated debt securities in its
portfolio in an attempt to determine if the issuers will have sufficient cash
flow and profits to meet required principal and interest payments. Achievement
of the Fund's investment objective may be more dependent upon the Investment
Adviser's credit analysis than is the case for higher quality debt securities.
Credit ratings for individual securities may change from time to time and the
Fund may retain a portfolio security whose rating has been changed.
 
 
                                      20
<PAGE>
 
  Convertible Securities in which the Fund invests include convertible debt
instruments not producing immediate cash income, such as zero-coupon
convertible securities, when their effective yield premiums or conversion
privileges over comparable instruments producing cash income make these
investments attractive. Prices of non-cash-paying instruments may be more
sensitive to changes in the issuer's financial condition, fluctuations in
interest rates and market demand/supply imbalances than cash-paying securities
with similar credit ratings, and thus may be more speculative. In addition,
the non-cash interest income accrued on such instruments is income for federal
income tax purposes and thus required to be included in distributions to
shareholders (without providing the corresponding cash flow with which to pay
such distributions which must be made from cash assets or by liquidation of
portfolio securities).
 
  It is an operating policy of the Fund not to purchase Convertible Securities
rated below B by both Moody's and S&P or non-rated securities considered by
the Investment Adviser to be of comparable quality. In the event, however,
that a rating of a Convertible Security owned by the Fund is lowered to C, Cl
or D by S&P or to C by Moody's, such security may be retained and the Fund may
add to its position. The issuers of securities so rated are financially
troubled, in default or in bankruptcy or reorganization. Debt obligations of
such companies usually sell at a deep discount from the face value of the
instrument. Unless the company's financial condition improves, such securities
may lose value or become worthless.
 
  As of December 31, 1997, the average percentage of the Fund's assets
invested in fixed income securities (or preferred stocks) within the various
rating categories (based on the S&P ratings if the securities are rated by
S&P, otherwise based on Moody's ratings), and the nonrated debt securities,
determined on a dollar weighted average, were as follows:
 
<TABLE>
     <S>                                                                   <C>
     AAA/Aaa..............................................................  3.6%
     AA/Aa................................................................  3.3%
     A/A.................................................................. 25.3%
     BBB/Baa.............................................................. 20.3%
     BB/Ba................................................................ 12.2%
     B/B.................................................................. 32.7%
     CCC/Caa..............................................................    0%
     CC/Ca................................................................    0%
     D....................................................................    0%
     Nonrated.............................................................    0%
     Common Stocks/Warrants...............................................    0%
     Cash and Equivalents.................................................  2.6%
       Total Net Assets...................................................  100%
</TABLE>
 
FOREIGN SECURITIES AND FOREIGN ISSUERS
 
  The Fund may invest in Eurodollar Convertible Securities. Eurodollar
Convertible Securities are fixed income securities of a U.S. issuer or a
foreign issuer that are issued in U.S. dollars outside the United States and
are convertible into or exchangeable for equity securities of the same or a
different issuer. Interest and dividends on Eurodollar securities are payable
in U.S. dollars outside of the United States. The Fund may invest without
limitation in Eurodollar Convertible Securities that are convertible into or
exchangeable for foreign equity securities listed, or represented by ADRs
listed, on the NYSE or the American Stock Exchange or convertible into or
exchangeable for publicly traded common stock of U.S. companies. Also, the
Fund may invest up to 15% of its total assets, taken at market value, in
Eurodollar Convertible Securities that are convertible into or exchangeable
for foreign equity securities which are not listed, or represented by ADRs
listed, on the NYSE or American Stock Exchange. Investments in securities of
foreign issuers may be affected favorably or unfavorably by changes in
currency rates and in exchange control regulations. There may be less publicly
available information about a foreign company than about a U.S. company, and
foreign companies are not subject to as stringent accounting, auditing and
financial reporting standards and requirements as those applicable to U.S.
companies. Securities of some foreign companies may be less liquid or more
volatile than securities of U.S.
 
                                      21
<PAGE>
 
companies, and foreign brokerage commissions and custodian fees are generally
higher than in the United States. Investments in foreign securities may also
be subject to other risks different from those affecting U.S. investments,
including local political or economic developments, expropriation or
nationalization of assets and imposition of withholding taxes on dividend or
interest payments.
 
                             INVESTMENT PRACTICES
 
LENDING OF PORTFOLIO SECURITIES
 
  The Fund may lend securities in its portfolio representing up to 25% of its
total assets, taken at market value, to securities firms and financial
institutions and receive collateral in cash or Government Securities which is
maintained at all times in an amount equal to at least 100% of the current
market value of the loaned securities. The Fund anticipates that all or
substantially all securities loaned, if any, will be loaned to Bear, Stearns &
Co. Inc. or Bear, Stearns Securities Corp., which are affiliated with the
Fund's custodian. The purpose of such loans, generally, is to permit the
borrower to use such securities for delivery to purchasers when the borrower
or its customers have entered into short sales. The total yield on the Fund's
portfolio will be increased by loans of its portfolio securities because the
Fund will receive fees for such loans. Such loans are terminable at any time.
Voting rights may pass with the loaned securities, but if a material event
were to occur affecting an investment or loan, the Fund would call the loan in
order to exercise voting rights. The risks in lending portfolio securities, as
with other extensions of credit, consist of possible delay in recovery of the
securities or possible loss of rights in the collateral should the borrower
fail financially. In determining whether the Fund will lend securities to a
particular borrower, the Fund will consider all relevant facts and
circumstances, including the creditworthiness of the borrower.
 
OTHER INVESTMENTS AND INVESTMENT PRACTICES
 
  The Fund may from time to time, (1) write (sell) covered call options on
common stocks that it owns or has an immediate right to acquire through
conversion or exchange of other securities on an amount up to 5% of its total
assets; or (2) purchase put options on such common stocks on an amount up to
2% of its total assets. The Fund may from time to time make short sales of
securities it owns or has the right to acquire through conversion or exchange
of other securities it owns. The Fund may enter into forward commitments for
the purchase of securities which may include purchases on a "when issued" or a
"delayed delivery" basis. The Fund may enter into "repurchase agreements"
pertaining to Government Securities with or "primary dealers" (as designated
by the Federal Reserve Bank of New York) in such securities or United States
national banks. The Fund may purchase stock index futures contracts in
anticipatory hedge transactions to reduce the risk of not participating in the
stock market when the Fund is less than fully invested. The Fund's investment
in stock index futures will be limited to 5% or less of its total assets.
Additional information regarding such investments and investment practices and
the risks related thereto is set forth in the Statement of Additional
Information.
 
PORTFOLIO TRANSACTIONS AND BROKERAGE
 
  The Investment Adviser is responsible for placing orders for the purchase
and sale of portfolio securities and negotiating the price of such
transactions. Most transactions made by the Fund are with dealers acting as
principals for their own accounts without a stated commission, although the
prices of the securities usually include a profit to the dealers. Broker-
dealers are selected for their professional capability and the overall value
and quality of their execution services. The Investment Adviser is authorized
to pay higher commissions to brokerage firms providing investment and research
information if the Investment Adviser deems such commissions reasonable in
relation to the overall services provided. The Investment Adviser may also use
information received to manage the assets of other advisory accounts. The Fund
does not pay any mark-up over the market price of securities acquired in
principal transactions with dealers.
 
                                      22
<PAGE>
 
PORTFOLIO TURNOVER
 
  The Fund purchases securities primarily for investment rather than short-
term trading. However, changes are made in the portfolio whenever it appears
advisable. The Fund's annual portfolio turnover rate is shown in the table of
"Financial Highlights" and for the fiscal year ended December 31, 1997 was
132.99%. A high rate of portfolio turnover (100% or more) involves
correspondingly greater brokerage commission expenses for the Fund. High
portfolio turnover may also result in the realization of substantial net
capital gains; to the extent net capital gains are realized, any distribution
derived from such gains on securities held for less than one year are taxable
at ordinary income tax rates for federal income tax purposes.
 
INVESTMENT RESTRICTIONS
 
  The Fund has adopted certain fundamental investment restrictions which, like
its investment objectives, cannot be changed without approval by a majority
(as defined in the Investment Company Act) vote of the fund's shareholders.
These restrictions are listed in the Statement of Additional Information.
 
                            MANAGEMENT OF THE FUND
 
  A board of eight directors is responsible for overseeing the Fund's affairs.
The Investment Adviser, which is headquartered at 865 South Figueroa Street,
Suite 1800, Los Angeles, California 90017, selects investments for the Fund,
provides administrative services and manages the Fund's business. The
Investment Adviser is a wholly-owned subsidiary of the TCW Group, Inc., whose
direct and indirect subsidiaries, including Trust Company of the West and TCW
Asset Management Company, have managed convertible securities portfolios for
institutional investors since 1976. Robert A. Day, who is chairman of the TCW
Group, Inc. may be deemed to be a control person of the Investment Adviser by
virtue of the aggregate ownership by Mr. Day and his family of more than 25%
of the outstanding voting stock of the TCW Group, Inc.
 
PORTFOLIO MANAGEMENT
 
  Robert M. Hanisee, Kevin A. Hunter and Thomas D. Lyon, Senior Vice
Presidents of the Fund, have been primarily responsible for the day-to-day
management of the Fund's investment portfolio. Messrs. Hanisee and Hunter have
been officers of the Investment Adviser for more than five years. Mr. Lyon
joined the Adviser in 1997 and previously was a portfolio manager for
Transamerica Investment Services.
 
ADVISORY AGREEMENT
 
  Under the Investment Advisory Agreement dated February 17, 1987, the Fund
pays the Investment Adviser a monthly fee computed at an annual rate of 0.75%
of the first $100,000,000 of average net assets and 0.50% of average net
assets in excess of $100,000,000 and the Investment Adviser for the cost (up
to $25,000 per year) of providing accounting services to the Fund. For the
last fiscal year, advisory fees and the accounting reimbursement equaled 0.58%
of the Fund's average net assets.
 
  The Fund also pays for shareholder service agent fees, custodian fees, legal
and audit fees, directors' fees, reports to shareholders and proxy statements,
and all other expenses incurred in the operation of the Fund, except those
assumed by the Investment Adviser. For the last fiscal year, the Fund's total
operating expenses were 0.74% of average net assets.
 
                                      23
<PAGE>
 
                       DETERMINATION OF NET ASSET VALUE
 
  The Fund calculates and makes available for weekly publication the net asset
value of its shares. Net asset value per share is determined by dividing the
value of the Fund's assets (including interest and dividends accrued but not
collected), less its liabilities (including accrued expenses), by the number
of outstanding shares. Each listed security and each security traded on the
National Association of Securities Dealers Automated Quotations National
Market System is valued at the last sale price or the mean of the reported
closing bid and asked prices if there are no sales in the trading period
immediately preceding the time of determination. Other securities which are
traded on the over-the-counter market are valued at the mean of the latest
available bid and asked prices. Securities for which quotations are not
readily available, unregistered securities and other assets are valued at fair
value as determined in good faith by, or under the direction of, the Board of
Directors. Notwithstanding the foregoing, short-term debt securities with
maturities of 60 days or less are valued at amortized cost.
 
                   DISTRIBUTIONS; DIVIDEND REINVESTMENT PLAN
 
DISTRIBUTION POLICY
 
  Since July, 1988, the Fund's policy has been to make quarterly distributions
of $0.21 per share to shareholders of record at the end of each calendar
quarter. This distribution policy requires payments substantially in excess of
the Fund's current net investment income. Only the portion, if any, of a
distribution which equals the Fund's current net investment income should be
considered a dividend. The remainder constitutes a payment out of the Fund's
net realized capital gains for each period to the extent available; any excess
will be from paid-in capital. A notice accompanies each quarterly distribution
to identify the estimated source of the distribution. See "Taxation" for
information concerning the federal income tax treatment of distributions by
the Fund to its shareholders.
 
  For years in which the Fund distributes amounts in excess of its net
investment income and net realized capital gains, such distributions will
decrease the Fund's total assets and, therefore, have the likely effect of
increasing the Fund's expense ratio. In addition, in order to make such
distributions, the Fund may have to sell a portion of its investment portfolio
at a time when independent investment judgment might not dictate such action.
 
  After expiration or offset of the Fund's capital loss carryovers, described
under "Taxation," the Fund's distributions for the third and/or fourth
quarters of a calendar year may, but need not, include net long-term capital
gains realized during the year. The Fund may retain for reinvestment and pay
federal income taxes on the excess of its net realized long-term capital gains
over its net realized short-term capital losses, if any, although the Fund
reserves the authority to distribute such excess in any year. The Fund's
distribution policy is subject to change and may be affected by future events,
including changes in tax or legal requirements.
 
DIVIDEND REINVESTMENT PLAN
 
  Shareholders of record (other than brokers or nominees of banks and other
financial institutions) are eligible to participate in the Dividend
Reinvestment Plan (the "Plan"), pursuant to which dividends and any payment
out of the Fund's net realized capital gains for the year and paid-in capital
distributed to shareholders will be paid in or reinvested in additional shares
of the Fund (the "Dividend Shares"). The Bank of New York (the "Agent"),
Dividend Reinvestment Department, P.O. Box 1958, Newark, New Jersey 07101-9774
acts as agent for participants under the Plan.
 
  A shareholder may join the Plan by signing and returning an authorization
form which may be obtained from the Agent. A shareholder may elect to withdraw
from the Plan at any time by written notice to the Agent and thereby elect to
receive cash in lieu of Dividend Shares. There is no penalty for withdrawal
from the Plan and shareholders who have previously withdrawn from the Plan may
rejoin it at any time. The Federal income tax consequences of participating in
the Plan are described below under "Taxation."
 
                                      24
<PAGE>
 
  Commencing not more than five business days before the dividend payment
date, purchases of the Fund's shares may be made by the Agent, on behalf of
the participants in the Plan, from time to time to satisfy dividend rein
vestments under the Plan. Such purchases by the Agent may be made when the
price plus estimated commissions of the Fund's Common Stock on the NYSE is
lower than the Fund's most recently calculated net asset value per share. If
the Agent determines on the dividend payment date that the shares purchased as
of such date are insufficient to satisfy the dividend reinvestment
requirements, the Agent, on behalf of the participants in the Plan, will
obtain the necessary additional shares as follows. To the extent that
outstanding shares are not available at a cost of less than per share net
asset value, the Agent, on behalf of the participants in the Plan, will accept
payment of the dividend, or the remaining portion thereof, in authorized but
unissued shares of the Fund on the dividend payment date. Such shares will be
issued at a per share price equal to the higher of (1) the net asset value per
share on the payment date, or (2) 95% of the closing market price per share on
the payment date. If the closing sale or offer price, plus estimated
commissions, of the Common Stock on the NYSE on the payment date is less than
the Fund's net asset value per share on such day, then the Agent will purchase
additional outstanding shares on the NYSE or elsewhere. There are no brokerage
charges with respect to shares issued directly by the Fund to satisfy the
dividend reinvestment requirements. However, each participant will pay a pro
rata share of brokerage commissions incurred with respect to the Agent's open
market purchases of shares. In each case, the cost per share of shares
purchased for each shareholder's account will be the average cost, including
brokerage commissions, of any shares purchased in the open market plus the
cost of any shares issued by the Fund.
 
  Shareholders participating in the Plan may receive benefits not available to
shareholders not participating in the Plan. If the market price plus
commissions of the Fund's shares is above the net asset value, participants in
the Plan will receive shares of the Fund at a discount of up to 5% from the
current market value. However, if the market price plus commissions is below
the net asset value, participants will receive distributions in shares at
prices below the net asset value. Also, since the Fund does not redeem its
shares, the price on resale may be more or less than the net asset value.
 
  In the case of foreign participants whose dividends are subject to United
States income tax withholding and in the case of any participants subject to
31% federal backup withholding, the Agent will reinvest dividends after
deduction of the amount required to be withheld.
 
  Experience under the Plan may indicate that changes are desirable.
Accordingly, the Fund reserves the right to amend or terminate the Plan. There
is no direct service charge to participants in the Plan; however, the Fund
reserves the right to amend the Plan to include a service charge payable by
the participants.
 
                                      25
<PAGE>
 
                                   TAXATION
 
GENERAL
 
  The Fund has qualified, and intends to qualify, each year as a regulated
investment company under Subchapter M of the Internal Revenue Code of 1986
(the "Code"). In order to qualify as a regulated investment company for any
taxable year, the Fund must (1) derive at least 90% of its gross income from
dividends, interest, certain payments with respect to securities loans and
gains from the sale or other disposition of stock or securities or foreign
currencies or other income derived with respect to its business of investing
in such stock, securities or currencies; and (2) distribute at least 90% of
its investment company taxable income (net investment income and the excess of
net short-term capital gain over net long-term and mid-term capital loss) for
the taxable year.
 
  As a regulated investment company, the Fund is not subject to Federal income
tax on its investment company taxable income and net capital gains (any net
long-term capital gains in excess of the sum of net short-term capital losses
and capital loss carryovers from prior years), if any, that it distributes to
its shareholders. The Fund intends to distribute annually to its shareholders
all of its investment company taxable income and net capital gains. The Fund
is subject to a nondeductible 4% excise tax measured with respect to certain
undistributed amounts of ordinary income and capital gain net income. The Fund
intends to distribute sufficient amounts to avoid liability for the excise
tax.
 
  Distributions of investment company taxable income generally are taxable to
shareholders as ordinary income, regardless of whether such distributions are
paid in cash or are invested in additional shares of the Fund's stock.
 
  A capital gain distribution, whether paid in cash or reinvested in shares,
is taxable to shareholders as long-term or mid-term capital gain, regardless
of the length of time a shareholder has held his shares or whether such gain
was realized by the Fund before the shareholder acquired such shares and was
reflected in the price paid for the shares. In the event a distribution
constitutes a return of capital, a shareholder reduces the tax cost basis for
his stock by the amount of the nontaxable distribution. If such distribution
exceeds the shareholder's tax cost basis, the excess is treated as a capital
gain.
 
  The Fund sends written statements and notices to shareholders regarding the
tax status of all dividends and distributions made during each calendar year.
 
  Shareholders who reinvest either distributions of investment company taxable
income or capital gain distributions in additional shares of the Fund's stock
are treated as receiving distributions of an amount equal to the fair market
value, determined as of the payment date, of the shares received if the shares
are purchased from the Fund. Such value may exceed the amount of the cash
distribution that would have been paid. If outstanding shares are purchased in
the open market, the taxable distribution equals the cash distribution that
would have been paid. In either event, the cost basis in the shares received
equals the amount recognized as a taxable distribution.
 
  A portion of the distributions of investment company taxable income paid by
the Fund is eligible for the 70% dividends received deduction allowed to
certain corporations. The eligible portion generally equals the proportion
that dividends from U.S. corporations bear to the Fund's gross income,
provided that the Fund designates such proportion as being eligible for the
deduction in the statement provided annually to shareholders. However, a
dividend received by the Fund is not treated as an "eligible dividend" if (1)
it has been received with respect to any share of stock that the Fund has held
for 45 days (90 days in the case of certain preferred stock) or less
(excluding any day more than 45 days (or 90 days in the case of certain
preferred stock) after the date on which the stock becomes ex-dividend); or
(2) to the extent that the Fund is under an obligation (pursuant to a short
sale or otherwise) to make related payments with respect to positions in
substantially similar or related property. The dividends received deduction is
not available for capital gain dividends. The Fund sends written notice to
shareholders regarding the tax status of all distributions made during each
calendar year.
 
 
                                      26
<PAGE>
 
DISQUALIFICATION AS A REGULATED INVESTMENT COMPANY
 
  If for any taxable year the Fund does not qualify as a regulated investment
company, all of its taxable income will be subject to tax at regular corporate
rates without any deduction for distributions to shareholders, and such
distributions will be taxable as ordinary dividends to the extent of the
Fund's current and accumulated earnings and profits.
 
BACKUP WITHHOLDING
 
  The Fund generally will be required to withhold tax at the rate of 31% with
respect to distributions of investment company taxable income and capital gain
distributions payable to a non corporate shareholder if the shareholder fails
to provide a correct taxpayer identification number or is otherwise subject to
backup withholding.
 
FOREIGN WITHHOLDING TAXES
 
  To the extent that the Fund invests in Eurodollar Convertible Securities,
dividends and interest received by the Fund on such securities may be subject
to foreign withholding taxes. The Fund will be entitled to claim a deduction
for such foreign withholding taxes for U.S. Federal income tax purposes.
However, any such taxes will reduce the income available for distribution to
the Fund's shareholders.
 
OTHER TAXATION
 
  Distributions to shareholders who are nonresident aliens may be subject to a
30% United States withholding tax under provisions of the Code applicable to
foreign individuals and entities unless a reduced rate of withholding or a
withholding exemption is provided under applicable treaty law. Nonresident
shareholders are urged to consult their own tax advisers concerning the
applicability of the United States withholding tax.
 
  The foregoing is only a brief summary of the Federal tax laws applicable to
investors in the Fund. Investors may also be subject to state and local taxes.
Investors should consult their own tax advisers regarding specific questions
as to Federal, state or local taxes.
 
        CUSTODIAN, TRANSFER AGENT, DIVIDEND-PAYING AGENT AND REGISTRAR
 
  The custodian of the assets of the Fund is Custodial Trust Company, 28 West
State Street, Trenton, New Jersey 08608. Rules adopted under the Investment
Company Act of 1940 permit the Fund to maintain its foreign securities in the
custody of certain eligible foreign banks and securities depositories.
Pursuant to these rules, any foreign securities in the Fund's portfolio may be
held by foreign sub-custodians and securities depositories.
 
  The transfer agent, dividend disbursing agent and registrar for the Fund's
shares is The Bank of New York, Church Street Station, New York, New York.
 
                                   AUDITORS
 
  Deloitte & Touche LLP, 1000 Wilshire Boulevard, Los Angeles, California
90017, independent auditors, has performed annual audits of the Fund's
financial statements since 1987.
 
                                      27
<PAGE>
 
                                 LEGAL MATTERS
 
  Counsel to the Fund is O'Melveny & Myers, LLP, Los Angeles, California. A
Director of the Fund is of counsel to, and a retired partner of that firm.
O'Melveny & Myers also provides legal services to The TCW Group, Inc. and its
subsidiaries, including the Investment Adviser. A former partner of the firm
is a member of the Board of Directors of The TCW Group, Inc. and Trust Company
of the West.
 
                            REPORTS TO SHAREHOLDERS
 
  The Fund sends unaudited semi-annual and audited annual reports to its
stockholders, including a list of investments held.
 
                                    EXPERTS
 
  The Statement of Assets and Liabilities of the Fund, including the Schedule
of Investments as of December 31, 1997, and the related Statement of
Operations for the year then ended, the Statement of Changes in Net Assets for
the years ended December 31, 1996 and December 31, 1997 and the Financial
Highlights and the fiscal years ended December 31, 1988 through 1997 years
ended thereafter included or incorporated by reference herein, have been
audited by Deloitte and Touche LLP, independent auditors, as indicated in
their report with respect thereto, and are included in reliance upon such
report and upon the authority of such firm as experts in accounting and
auditing.
 
                              FURTHER INFORMATION
 
  This Prospectus does not contain all of the information included in the
Registration Statement filed with the Securities and Exchange Commission under
the Securities Act and the Act, with respect to the Fund's Shares offered
hereby, certain portions of which have been omitted pursuant to the rules and
regulations of the Securities and Exchange Commission. The Registration
Statement, including exhibits filed therewith, may be examined at the office
of the Securities and Exchange Commission in Washington, D.C.
 
  Statements contained in this Prospectus as to the contents of any contract
or other document referred to are not necessarily complete, and, in each
instance, reference is made to the copy of such contract or other document
filed as an exhibit to the Registration Statement, of which this Prospectus
forms a part, each such statement being qualified in all respects by such
reference.
 
 
                                      28
<PAGE>
 
                            DESCRIPTION OF RATINGS
 
                                   APPENDIX
 
  Description of Standard & Poor's Corporation ("S&P") and Moody's Investors
Service, Inc. ("Moody's") senior securities ratings.
 
MOODY'S:
 
  Aaa--Bonds which are rated Aaa are judged to be of the best quality. They
carry the smallest degree of investment risk and are generally referred to as
"gilt edged." Interest payments are protected by a large or by an
exceptionally stable margin and principal is secure. While the various
protective elements are likely to change, such changes as can be visualized
are most unlikely to impair the fundamentally strong position of such issues.
 
  Aa--Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group they comprise what are generally known
as high grade bonds. They are rated lower than the best bonds because margins
of protection may not be as large as in Aaa securities or fluctuation of
protective elements may be of greater amplitude or there may be other elements
present which make the long term risk appear somewhat larger than in the Aaa
securities.
 
  A--Bonds which are rated A possess many favorable investment attributes and
are to be considered as upper medium grade obligations. Factors giving
security to principal and interest are considered adequate, but elements may
be present which suggest a susceptibility to impairment sometime in the
future.
 
  Baa--Bonds which are rated Baa are considered as medium grade obligations
(i.e., they are neither highly protected nor poorly secured). Interest
payments and principal security appear adequate for the present but certain
protective elements may be lacking or may be characteristically unreliable
over any great length of time. Such bonds lack outstanding investment
characteristics and in fact have speculative characteristics as well.
 
  Fixed income securities which are rated Aaa, Aa, A and Baa are considered
investment grade.
 
  Ba--Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well assured. Often the protection of interest
and principal payments may be very moderate and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.
 
  B--Bonds which are rated B generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.
 
  Caa--Bonds which are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal
or interest.
 
  Ca--Bonds which are rated Ca represent obligations which are speculative in
a high degree. Such issues are often in default or have other marked
shortcomings.
 
  C--Bonds which are rated C are the lowest rated class of bonds and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.
 
  Note: Moody's applies numerical modifiers, 1, 2, and 3 in each generic
rating classification from Aa through B in its corporate bond rating system.
The modifier 1 indicates that the security ranks in the higher end of its
generic rating category; the modifier 2 indicates a mid-range ranking; and the
modifier 3 indicates that the issue ranks in the lower end of its generic
rating category.
 
                                      A-1
<PAGE>
 
S&P:
 
  AAA--Debt rated AAA has the higher rating assigned by S&P. Capacity to pay
interest and repay principal is extremely strong.
 
  AA--Debt rated AA has a very strong capacity to pay interest and repay
principal and differs from the higher rated issues only in small degree.
 
  A--Debt rated A has a strong capacity to pay interest and repay principal
although it is somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than debt in higher rated categories.
 
  BBB--Debt rated BBB is regarded as having an adequate capacity to pay
interest and repay principal. Whereas it normally exhibits adequate protection
parameters, adverse economic conditions or changing circumstances are more
likely to lead to a weakened capacity to pay interest and repay principal for
debt in this category than in higher rated categories.
 
  Fixed income securities rated AAA, AA, A and BBB are considered investment
grade.
 
  BB--Debt rated BB has less near-term vulnerability to default than other
speculative issues. However, it faces major ongoing uncertainties or exposure
to adverse business, financial, or economic conditions which could lead to
inadequate capacity to meet timely interest and principal payments. The BB
rating category is also used for debt subordinated to senior debt that is
assigned an actual or implied BBB- rating.
 
  B--Debt rated B has a greater vulnerability to default but currently has the
capacity to meet interest payments and principal repayments. Adverse business,
financial or economic conditions will likely impair capacity or willingness to
pay interest any repay principal. The B rating category is also used for debt
subordinated to senior debt that is assigned an actual or implied BB or BB-
rating.
 
  CCC--Debt rated CCC has a currently identifiable vulnerability to default,
and is dependent upon favorable business, financial and economic conditions to
meet timely payment of interest repayment of principal. In the event of
adverse business financial, or economic conditions, it is not likely to have
capacity to pay interest and repay principal. The CCC rating category is also
used for debt subordinated to senior debt that is assigned an actual or
implied B or B- rating.
 
  CC--The rating CC is typically applied to debt subordinated to senior debt
which is assigned an actual or implied CCC rating.
 
  C--The rating C is typically applied to debt subordinated to senior debt
which is assigned an actual or implied CCC- debt rating. The C rating may be
used to cover a situation where a bankruptcy petition has been filed, but debt
service payments are continued.
 
  CI--The rating CI is reserved for income bonds on which no interest is being
paid.
 
  D--Debt rated D is in payment default. The D rating category is used when
interest payments or principal payments are not made on the date due even if
the applicable grace period has not expired, unless S&P believes that such
payments will be made during such grace period. The D rating also will be used
upon the filing of a bankruptcy petition if debt service payments are
jeopardized.
 
  Plus (+) or Minus (-): The ratings from AA to CCC may be modified by the
addition of a plus or minus sign to show relative standing within the major
rating categories.
 
                                      A-2
<PAGE>
 
PREFERRED STOCK RATINGS:
 
  Both Moody's and S&P use the same designations for corporate bonds as they
do for preferred stock except in the case of Moody's preferred stock ratings
the initial letter rating is not capitalized. While the descriptions are
tailored for preferred stocks the relative quality distinctions are comparable
to those described above for corporate bonds.
 
                                      A-3
<PAGE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
 NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS IN CONNECTION WITH THE OFFER
MADE BY THIS PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION MUST NOT BE
RELIED UPON AS HAVING BEEN AUTHORIZED BY THE FUND OR THE INVESTMENT ADVISER.
THIS PROSPECTUS DOES NOT CONSTITUTE AN OFFERING BY THE FUND IN ANY
JURISDICTION IN WHICH SUCH OFFERING MAY NOT LAWFULLY BE MADE.
 
                               -----------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Fee Table..................................................................   2
Prospectus Summary.........................................................   3
Financial Highlights.......................................................   7
The Offer..................................................................   8
Special Considerations and Risk Factors....................................  14
Use of Proceeds............................................................  15
Description of Common Stock................................................  15
Investment Objective and Policies..........................................  17
Investment Practices.......................................................  22
Management of the Fund.....................................................  23
Determination of Net Asset Value...........................................  24
Distributions; Dividend Reinvestment Plan..................................  24
Taxation...................................................................  26
Custodian, Transfer Agent, Dividend-Paying Agent and Registrar.............  27
Auditors...................................................................  27
Legal Matters..............................................................  28
Reports to Shareholders....................................................  28
Experts....................................................................  28
Further Information........................................................  28
Appendix A................................................................. A-1
</TABLE>
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
 
                              7,737,466 SHARES OF
                                 COMMON STOCK
                            ISSUABLE UPON EXERCISE
                            OF RIGHTS TO SUBSCRIBE
                              FOR SUCH SHARES OF
                                 COMMON STOCK
 
                                TCW CONVERTIBLE
                             SECURITIES FUND, INC.
 
 
                                   ---------
 
                              P R O S P E C T U S
                                 JUNE 30, 1998
 
                                   --------
 
 
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>
 
    
                 PART B - STATEMENT OF ADDITIONAL INFORMATION
                     TCW CONVERTIBLE SECURITIES FUND, INC.
                                 June 29, 1998      

    
This Statement of Additional Information is not a Prospectus but contains
information in additional to that set forth in the Prospectus dated June 29,
1998 and should be read in conjunction with the Prospectus. A Prospectus may be
obtained without charge by calling (800) 386-3829 or writing the Fund at 865
South Figueroa Street, Suite 1800, Los Angeles, California 90017.      

<TABLE>
<S>                                                                       <C>
Investment Policies.....................................................   B-2
     Options............................................................   B-2
     Short Sales Against the Box........................................   B-3
     Forward Commitments................................................   B-4
     Repurchase Agreements..............................................   B-4
     Stock Index Futures................................................   B-5

Investment Restrictions.................................................   B-7

Management of the Fund..................................................   B-8
     Directors and Officers.............................................   B-8

Investment Advisory and Other Services..................................   B-13
     Investment Adviser.................................................   B-13
     Investment Advisory Management Agreement...........................   B-13
     Fees and Expenses..................................................   B-14

Portfolio Transactions and Brokerage....................................   B-15
     General............................................................   B-15
     Portfolio Turnover.................................................   B-16

Taxation - Futures and Hedging Transactions.............................   B-17

Principal Shareholders of the Fund......................................   B-17

Financial Statements....................................................   B-18
</TABLE>
<PAGE>
 
                              INVESTMENT POLICIES

     The following supplements information set forth under the captions
"Investment Objectives and Policies" and "Investment Practices" in the
Prospectus.  Readers must also refer to the Prospectus.

OPTIONS

     The Fund may from time to time, and to the extent described below, (1)
write (sell) covered call options on common stocks that it owns or has an
immediate right to acquire through conversion or exchange of other securities;
or (2) purchase put options on such common stocks.  The Fund may also enter
transactions with respect to such options.  All options written or purchased by
the Fund must be listed on a national securities exchange. The requirements for
qualification as a "regulated investment company" may limit the degree to which
the Fund may utilize option strategies.  See "Taxation."

     Many currently traded Convertible Securities are convertible into common
stocks against which listed call options may be written. A call option gives the
purchaser the right to buy, and the writer has the obligation to sell, the
underlying security at the option exercise price during the option period. The
Fund may only write "covered" call options, that is, options on common stock
that it holds in its portfolio or that it has an immediate right to acquire
through conversion or exchange of securities held in its portfolio. The Fund may
write call options on up to 5% of its total assets, taken at market value,
determined as of the date the options are written.

     The Fund will write covered call options in order to receive premiums which
it is paid for writing options.  Such premiums represent a gain to the Fund if
the option expires unexercised.  Such gain may offset possible declines in the
market values of the common stocks or Convertible Securities held in its
portfolio.  If, for example, the market price of a common stock underlying a
Convertible Security held by the Fund declines and the Convertible Security also
declines in value, such decline will be offset in part (or wholly) by the
receipt of the premium for writing the call options on such stock.  However, if
the market price of the underlying common stock increases and the Convertible
Security held by the Fund also increases in value, such increase may be offset
in part (or wholly) by a loss resulting from the need to buy back at higher
prices the covered call options written by the Fund or through the lost
opportunity for any participation in the capital appreciation of the underlying
security above the exercise price.

     In addition to writing covered call options, the Fund may invest up to 2%
of its total assets, taken at market value, determined as of the date the
options are written, in the purchase of put options on common stock that it owns
or may acquire through the conversion or exchange of other securities that it
owns. A put option gives the holder the right to sell the underlying security at
the option exercise price at any time during the option period. Any losses
realized by the Fund in connection with its purchase of put options will be
limited to the premiums paid by the Fund for the purchase of such options plus
any transaction costs.

                                      B-2
<PAGE>
 
     The Fund intends to purchase put options on particular securities in order
to protect against a decline in the market value of the underlying security
below the exercise price less the premium paid for the option.  The authority to
purchase put options will allow the Fund to protect the unrealized gain in an
appreciated security in its portfolio without actually selling the security.  In
addition, the Fund will continue to receive interest or dividend income on the
security.  The Fund may sell a put option which it has previously purchased
prior to the sale of the securities underlying such option.  Such sales will
result in a net gain or loss depending on whether the amount received on the
sale is more or less than the premium and other transaction costs paid for the
put option that is sold.  Such gain or loss may be wholly or partially offset by
a change in the value of the underlying security which the Fund owns or has the
right to acquire.

SHORT SALES AGAINST THE BOX

     The Fund may from time to time make short sales of securities it owns or
has the right to acquire through conversion or exchange of other securities it
owns.  A short sale is "against the box" to the extent that the Fund
contemporaneously owns or has the right to obtain at no added cost securities
identical to those sold short.  In a short sale, the Fund does not immediately
deliver the securities sold and does not receive the proceeds from the sale.  
The Fund is said to have a short position in the securities sold until it
delivers the securities sold, at which time it receives the proceeds of the
sale.  The Fund may not make short sales or maintain a short position if to do
so would cause more than 25% of the Fund's total assets, taken at market value,
to be held as collateral for such sales.

     To secure its obligation to deliver the securities sold short, the Fund
will deposit in escrow in a separate account with its custodian an equal amount
of the securities sold short or securities convertible into or exchangeable for
such securities.  The Fund may close out a short position by purchasing and
delivering an equal amount of the securities sold short, rather than by
delivering securities already held by the Fund, because the Fund may want to
continue to receive interest and dividend payments on securities in its
portfolio that are convertible into the securities sold short.

     The Fund may make a short sale in order to hedge against market risks when
the Investment Adviser believes that the price of a security may decline,
causing a decline in the value of a security owned by the Fund or a security
convertible into or exchangeable for such security, or when the Fund does not
want to sell the security it owns.  In such case, any future losses in the
Fund's long position should be reduced by a gain in the short position.
Conversely, any gain in the long position should be reduced by a loss in the
short position.  The extent to which such gains or losses are reduced will
depend upon the amount of the security sold short relative to the amount the
Fund owns, either directly or indirectly, and, in the case where the Fund owns
Convertible Securities, changes in the investment values or conversion premiums.
Additionally, the Fund may use short sales when it is determined that a
Convertible Security can be bought at a small conversion premium and has a yield
advantage relative to the underlying common stock sold short.  The potential
risk in this strategy is the possible loss of any premium over conversion value
in the Convertible Security at the time of purchase.  The purpose of this
strategy is to produce income from the yield advantage and to provide the
potential for a gain should the conversion premium increase.

                                      B-3
<PAGE>
 
FORWARD COMMITMENTS

     The Fund may enter into forward commitments for the purchase of securities
in an amount up to 25% of total assets.  Such transactions may include purchases
on a "when issued" or a "delayed delivery" basis.  In some cases, a forward
commitment may be conditioned upon the occurrence of a subsequent event, such as
approval and consummation of a merger, corporate reorganization or debt
restructuring (i.e., a "when, as and if issued" trade).  When such transactions
are negotiated, the price is fixed at the time of the commitment, with payment
and delivery taking place in the future, frequently a month or more after the
date of the commitment.  While the Fund will only enter into a forward
commitment with the intention of actually acquiring the security, the Fund may
sell the security before the settlement date if it is deemed advisable.  
However, the Fund will not make such a sale if it would cause the Fund to
violate the Three-Month Gain Rule.  See "Taxation."  Securities issued in
connection with mergers, corporate reorganizations or debt restructuring may
involve special risks arising from greater use of leverage in the capital
structure of issuers.  Such securities will not be purchased by the Fund,
however, unless they satisfy the investment criteria described above. See
"Investment Objective and Policies - General."

     Securities purchased under a forward commitment are subject to market
fluctuation, and no interest (or dividends) accrue to the Fund prior to the
settlement date. At the time the Fund enters into a forward commitment, it will
record the transaction and thereafter reflect the value, each day, of the
security purchased in determining its net asset value. Any unrealized
appreciation or depreciation reflected in such valuation of a "when, as and if
issued" security would be canceled in the event that the required condition did
not occur and the trade was canceled.

     The Fund maintains a segregated account (which will be marked to market
daily) of cash or liquid portfolio securities (which may have maturities that
are longer than the term of the forward commitment) with the Fund's custodian in
an aggregate amount equal to the amount of its forward commitments as long as
the obligation to purchase continues.  In entering into forward commitments, the
Fund relies on the other party to complete the transaction; should the other
party fail to do so, the Fund might lose a purchase opportunity that could be
more advantageous than alternative opportunities at the time of the failure.

REPURCHASE AGREEMENTS

     The Fund may enter into "repurchase agreements" pertaining to Government
Securities with member banks of the Federal Reserve System or "primary dealers"
(as designated by the Federal Reserve Bank of New York) in such securities. A
repurchase agreement arises when the Fund purchases a security and
simultaneously agrees to resell it to the seller at an agreed upon future date.
The resale price is greater than the purchase price, reflecting an agreed upon
market rate of return which is effective for the period of time the Fund's money
is invested in the repurchase agreement and which is not related to the coupon
rate on the purchased security. Such agreements permit the Fund to earn interest
on temporarily available cash. The Fund requires the seller to maintain the
value of the securities, marked to market daily, at not less than the repurchase
price. If the seller 

                                      B-4
<PAGE>
 
defaults on its repurchase obligation, the Fund could suffer delays, collection
expenses and losses to the extent that the proceeds from the sale of the
collateral are less than the repurchase price.  The Fund will not invest more
than 5% of its total assets, taken at market value, in repurchase agreements
maturing in more than seven days.  The Investment Adviser will consider all
relevant facts and circumstances, including the creditworthiness of the other
party, in determining whether to cause the Fund to enter into a repurchase
agreement.

STOCK INDEX FUTURES

     The Fund may purchase stock index futures contracts ("futures") in
anticipatory hedge transactions to reduce the risk of not participating in the
stock market when the Fund is less than fully invested. Such purchases would be
made when the Investment Adviser anticipates that the purchase of stock index
futures with a portion of its assets is desirable as a temporary substitute for
being fully invested in Convertible Securities. The Fund will not engage in
futures transactions for purposes of speculation. Thus, the Fund would not
purchase stock index futures contracts with aggregate settlement prices in
excess of the value of the cash, U.S. government securities and other liquid
portfolio securities held by the Fund. The requirements for qualification as a
"regulated investment company" may limit the degree to which the Fund may
purchase futures contracts. See "Taxation."

     A stock index assigns relative value to the common stocks included in the
index (for example, the Standard & Poor's 500 Composite Stock Price Index), and
the stock index fluctuates with changes in the market value of such stocks. When
the Fund buys a future, it agrees to pay or receive an amount of cash equal to a
specified dollar amount times the difference between the stock index value at
the close of the last trading date of the future and the price at which the
future is purchased. No physical delivery of the stocks included in the index
underlying the future is made. As it purchases Convertible Securities, the Fund
may close out a future before its settlement date by effecting an offsetting
transaction. A futures purchase is closed out by effecting a sale of a futures
contract of the same type with the same settlement date. If the offsetting sales
price exceeds the purchase price, the Fund realizes a gain, whereas if the
purchase price exceeds the offsetting sale price, the Fund realizes a loss.

     In purchasing stock index futures contracts the Fund will comply with rules
and interpretations of the Commodity Futures Trading Commission ("CFTC"), under
which the Fund is excluded from regulation as a "commodity pool operator." CFTC
regulations allow unlimited use of futures for "bona fide hedging" purposes, as
defined in CFTC regulations, and limit the aggregate initial margin on non-
hedging futures to 5% of the fair market value of the Fund's total assets. The
extent to which the Fund may engage in futures transactions may also be limited
by the Internal Revenue Code's requirements for qualification as a regulated
investment company. See "Taxation."

     The risk of loss in trading futures contracts in speculative strategies can
be substantial. Because the futures portfolio strategies of the Fund are engaged
in only for hedging purposes, however, the Investment Adviser does not believe
that the Fund is subject to the same degree of risk sometimes associated with
futures transactions.  Nevertheless, utilization of futures transactions by the
Fund does involve certain risk.

                                      B-5
<PAGE>
 
     There can be no assurance that hedging transactions will be successful, as
they will depend upon the Investment Adviser's ability to predict changes in
general stock market conditions and the future direction of stock prices and
interest rates. There is imperfect correlation (or no correlation) between the
price movements of the futures contracts and price movements of the Convertible
Securities that the Fund intends to purchase. To compensate for the imperfect
correlation of movements of prices of a stock index future and the Convertible
Securities being hedged, the Fund will purchase stock index futures contracts in
a lesser dollar amount than the dollar amount of the Convertible Securities that
the Fund intends to purchase because the historical volatility of the price of
Convertible Securities is less than the historical volatility of the stock
index. Nevertheless, the price of the stock index future may move less than the
price of the Convertible Securities that are subject to the anticipatory hedge
resulting in the hedge not being fully effective or the value of futures
contracts may decline while the value of the Convertible Securities that the
Fund intends to purchase may increase. The latter situation may occur if both
stock market prices and interest rates decline during the period the Fund owns
stock index futures.  The price of stock index futures may not correlate
perfectly with movement in the stock index, due to certain market distortions.
This might result from decisions by a significant number of market participants
holding stock index futures positions to close out their futures contracts
through offsetting transactions rather than to make additional margin deposits.
Also, increased participation by speculators in the futures market may cause
temporary price distortions. Due to the possibility of such price distortion in
the futures markets and because of the imperfect correlation between movements
in the stock index futures, a correct forecast of general market trends by the
Investment Adviser may not result in a fully successful hedging transaction over
a short time frame. Thus if the Investment Adviser's predictions are incorrect,
the Fund would have been better off if no hedge had been made. Hedging
transactions through the use of stock index futures requires skills different
from those needed to select portfolio securities. The Fund has not invested in
stock index futures during the past five years.

     Futures positions may be closed out only on an exchange or board of trade
which provides a market for such futures. Although the Fund intends to purchase
futures which have an active market, there is no assurance that a liquid market
will exist for any particular contract or at any particular time. Thus, it may
not be possible to close a futures position in anticipation of adverse price
movements.

     The settlement procedure in connection with the Fund's entry into a futures
transaction requires the deposit of cash or Government Securities, constituting
initial margin, in a special segregated account with the Fund's Custodian in the
name and for the benefit of the Fund's futures commission merchant ("FCM").
Subsequent payments, called maintenance margin, are made to and from the FCM (a
process known as "marking to market") on a daily basis as the value of the long
and short positions in the futures contract fluctuates.

     The Fund, on a daily basis, will monitor amounts of maintenance margin due
to it and will promptly demand payment and transfer those amounts from its FCM
to its custodian (for the general or segregated custodial account, as
appropriate).

                                      B-6
<PAGE>
 
     Initial margin held by the custodian will continue to be regarded as the
Fund's assets, unless and until such amounts are owed to such FCM. In the event
of insolvency of an FCM, amounts held by the custodian in the segregated account
for the benefit of the FCM and by the FCM for the benefit of the Fund may become
subject to Federal bankruptcy laws and bankruptcy regulations of the CFTC, which
provide for pro rata distribution to customers of the FCM of all customer
property.

INVESTMENT RESTRICTIONS

     The following restrictions are fundamental policies which may not be
changed without the approval of the holders of a majority of the Fund's
outstanding voting securities.  For purposes of the investment percentage
limitations set forth below and other percentage limitations set forth in this
Prospectus: (i) all percentage limitations apply immediately after a purchase or
initial investment, and (ii) any subsequent change in any applicable percentage
resulting from market fluctuations or other changes in total or net assets does
not require elimination of any security from the Fund.

     The Fund will not:

     1.   Purchase the securities of any issuer (other than the Government
Securities), if immediately thereafter the Fund with respect to 75% of its total
assets would (a) have more than 5% of its total assets invested in the
securities of such issuer, or (b) own more than 10% of the outstanding voting
securities of such issuer.

     2.   Invest 25% or more of its total assets in securities of issuers
conducting their principal business activities in the same industry; provided
that there is no limitation with respect to investments in Government
Securities.

     3.   Make loans of money to other persons (except the Fund may invest in
repurchase agreements and in unregistered Convertible Securities as provided in
(11) below); provided that for purposes of this restriction the acquisition of a
portion of an issue of publicly distributed Convertible Securities and other
debt securities and investment in Government Securities, short-term commercial
paper, certificates of deposit, and bankers' acceptances shall not be deemed to
be the making of a loan; and provided further that the Fund may lend portfolio
securities representing up to 25% of its total assets, taken at market value, to
securities firms and financial institutions if it receives collateral in cash or
Government Securities required to be maintained at all times in an amount equal
to at least 100% of the current market value of the loaned securities.

     4.   Engage in underwriting of securities of other issuers, except that
portfolio securities, including unregistered securities, may be acquired under
circumstances where, if sold, the Fund might be deemed to be an underwriter
under the Securities Act of 1933.

     5.   Borrow money or issue senior securities (as defined in the 1940 Act),
except that the Fund may borrow in amounts not exceeding 5% of the value of its
total assets (not including the amount borrowed) for temporary or emergency
purposes or for the purpose of financing repurchase of its shares. For the
purpose of this investment restriction, collateral or escrow arrangements with
respect to margin for futures contracts are not deemed to be a pledge of assets
and neither such arrangements nor the purchase of futures contracts are deemed
to be the issuance of a senior security.

                                      B-7
<PAGE>
 
     6.   Purchase or sell commodities or commodity contracts, including futures
contracts or options on futures contracts in a contract market or other futures
market, except that the Fund may purchase stock index futures contracts as
described under "Investment Objective and Policies- Stock Index Futures."

     7.   Purchase or sell real estate or real estate mortgage loans; provided
that the Fund may invest in securities secured by real estate or interests
therein or issued by companies that invest in real estate or interests therein.

     8.   Purchase securities on margin, except for short-term credits as may be
necessary for the clearance of transactions.

     9.   Make short sales of securities or maintain a short position except as
described under "Investment Objective and Policies--Short Sales Against the
Box."

     10.  Purchase or sell (write) call options except as described under
"Investment Objective and Policies--Options."

     11.  Invest more than 15% of its total assets taken at market value, in
unregistered Convertible Securities, including any unregistered common stock
acquired upon conversion or exchange of unregistered Convertible Securities,
excluding, however, restricted securities eligible for resale pursuant to Rule
144A under the Securities Act of 1933 which the Board of Directors, or the
Fund's Investment Adviser has determined under Board-approved guidelines, are
liquid.


                            MANAGEMENT OF THE FUND

DIRECTORS AND OFFICERS

     A board of eight directors is responsible for overseeing the Fund's
affairs.  The Fund has an executive committee, consisting of Ernest O. Ellison,
Chairman, Norman Barker, Jr. and Coleman W. Morton, which may act for the Board
of Directors between meetings, except where Board action is required by law.  
The directors and officers of the Fund, their business addresses and their
principal occupations for the last five years are set forth below.

                                      B-8
<PAGE>
 
<TABLE>
<CAPTION>
                                                      PRINCIPAL OCCUPATION DURING
NAME AND ADDRESS                  OFFICE                        PAST 5 YEARS
- ----------------                  ------                        ------------
<S>                          <C>                      <C>
Ernest O. Ellison* (67)      President and Director   Vice Chairman of the Board and Chief
865 S. Figueroa Street                                Investment Officer, The TCW Group, Inc.
Los Angeles, CA 90017                                 (formerly TCW Management Company) and 
                                                      Trust Company of the West.  For more than 
                                                      10 years prior to May 1992, Mr. Ellison 
                                                      served in various executive positions with 
                                                      the Fund's Adviser and its affiliates.

John C. Argue (66)                   Director         Of Counsel, Argue Pearson Harbison &
801 South Flower Street                               Myers (law firm); Director, Apex Mortgage 
Los Angeles, CA 90017                                 Capital, Inc. (real estate investment trust),
                                                      Avery Dennison Corporation (manufacturer of 
                                                      self-adhesive products and office supplies), 
                                                      CalMat Company (producer of aggregates, 
                                                      asphalt and ready mixed concrete), Nationwide 
                                                      Health Properties, Inc. (real estate investment
                                                      trust) and TCW Galileo Funds, Inc.; Advisory 
                                                      Director, LAACO Ltd. (owner and operator of 
                                                      private clubs and real estate); Trustee, 
                                                      TCW/DW Mutual Funds.

Norman Barker, Jr. (76)              Director         Former Chairman of the Board, First Interstate
707 Wilshire Blvd.                                    Bank of California and former Vice Chairman
Los Angeles, CA 90017                                 of the Board, First Interstate Bancorp; Director,      
                                                      American Health Properties, Inc., ICN             
                                                      Pharmaceuticals, Inc., and TCW Galileo Funds, Inc.; 
                                                      Chairman of the Board, Fidelity Federal Bank and 
                                                      Pacific American Income Shares, Inc.

Richard W. Call (73)                 Director         Former President, The Seaver Institute (a private 
800 Wilshire Blvd.                                    foundation); Director, TCW Galileo Funds, Inc. and 
Los Angeles, CA 90017                                 The Seaver Institute.

Coleman W. Morton (78)               Director         Private investor; formerly Member of the
865 S. Figueroa St.                                   Advisory Board and President and Director
Los Angeles, CA 90017                                 The Investment Company of America
</TABLE> 

                                      B-9
<PAGE>
 
<TABLE>    
<S>                          <C>                      <C>  
Charles A. Parker (63)               Director         Formerly, Executive Vice President and
865 S. Figueroa St.                                   Director, The Continental Corporation;
Los Angeles, CA 90017                                 formerly Chairman and Chief Executive 
                                                      Officer, Continental Asset Management 
                                                      Corporation; Director, Underwriters 
                                                      Reinsurance Co.
 
Lawrence J. Sheehan* (65)            Director         Of Counsel to, and Partner (1968 to 1994)
1999 Avenue of the Stars                              of the law firm of O'Melveny & Myers, legal
Suite 700                                             counsel to the Fund and the Investment
Los Angeles, CA 90067                                 Adviser; Director, Source Capital, Inc. 
                                                      FPA Capital Fund, Inc., FPA New Income Fund, 
                                                      Inc. and FPA Perennial Fund, Inc.
 
Robert G. Sims* (66)                 Director         Private Investor; Director, The TCW Group,
865 S. Figueroa St.                                   Inc.
Los Angeles, CA 90017                                 
</TABLE>      

* Directors who are or may be deemed to be "interested persons" of the Fund as
defined in the 1940 Act.  Mr. Ellison is an officer of the Fund and a
shareholder and director of The TCW Group, Inc., the parent corporation of the
Investment Adviser.  Mr. Sims is a director of the Fund and is a shareholder of
and has served as a director of the parent corporation during the past two
years.  Mr. Sheehan is Of Counsel to, and a former partner of, legal counsel to
the Fund and the Investment Adviser.

     The following table illustrates the compensation paid to the Fund's
independent directors (the "Independent Directors") by the Fund for the fiscal
year ended December 31, 1997.

<TABLE>
<CAPTION>
 
                                                 AGGREGATE COMPENSATION
          NAME OF INDEPENDENT DIRECTORS              FROM THE FUND
          -----------------------------          -----------------------
          <S>                                    <C>
          John C. Argue......................        $ 5,250
          Norman Barker, Jr..................         12,750
          Richard W. Call....................         12,750
          Coleman W. Morton..................         11,250
          Charles A. Parker..................         11,250 
</TABLE>

     The following table illustrates the compensation paid to fund's Independent
Directors for the calendar year ended December 31, 1997 by the TCW Galileo
Funds, Inc. in the case of Messrs. Barker and Call, as well as from the Fund.
The TCW Galileo Funds, Inc. is included solely because the Fund's Investment
Adviser also serves as its adviser.

                                      B-10
<PAGE>
 
<TABLE>
<CAPTION>
                                                           TOTAL CASH
                                                          COMPENSATION
                                                            FROM THE
                                      FOR SERVICE AS       TCW GALILEO
                                  DIRECTOR AND COMMITTEE   FUNDS, INC.
NAME OF INDEPENDENT DIRECTOR        MEMBER OF THE FUND     AND THE FUND
- ----------------------------      ----------------------   ------------
<S>                               <C>                      <C>
 John C. Argue.............                $ 5,250              $43,250
 Norman Barker, Jr.........                 12,750               50,750
 Richard W. Call...........                 12,750               50,750
</TABLE>

The following information relates to the executive officers of the Fund who are
not directors of the Fund.  The business address of each is 865 South Figueroa
Street, Los Angeles, California 90017.  Several of such officers own common
stock of The TCW Group, Inc. the parent corporation of the Investment Adviser.

                                      B-11
<PAGE>
 
<TABLE> 
<CAPTION> 
                                                                PRINCIPAL OCCUPATION DURING                    
NAME                                   OFFICE                         PAST 5 YEARS                             
- -----                                  ------                         ------------                             
<S>                               <C>                           <C>                                            
Thomas E. Larkin, Jr. (58)        Vice Chairman                 Vice Chairman, TCW Asset Management Company;   
                                                                President and Director, Trust Company of the   
                                                                West; Chairman, the Adviser; Executive Vice    
                                                                President, TCW Group, Inc.; President and      
                                                                Director, TCW Galileo Funds, Inc.; President   
                                                                and Trustee, TCW/DW Funds.                     
                                                                                                               
Ronald E. Robison (59)                Senior Vice               Managing Director, TCW Asset Management        
                                  President and Chief           Company, Trust Company of the West and          
                                  Operating Officer             the Adviser; Chief Operating Officer, 
                                                                the Adviser.
 
Robert M. Hanisee (59)                Senior Vice               Managing Director TCW Asset Management
                                       President                Company, Trust Company of the West and 
                                                                the Adviser.
 
Kevin A. Hunter (39)                  Senior Vice               Managing Director, TCW Asset Management
                                       President                Company, Trust Company of the West and 
                                                                the Adviser.
 
Thomas D. Lyon (38)                   Senior Vice               Managing Director, TCW Asset Management
                                       President                Company and the Adviser.  Portfolio Manager, 
                                                                Transamerica Investment Services prior to 
                                                                October, 1997.
 
Michael E. Cahill (47)            General Counsel and           Managing Director, General Counsel and
                                  Assistant Secretary           Secretary, TCW Asset Management Company, 
                                                                Trust Company of the West, the Adviser and 
                                                                The TCW Group, Inc.
 
Alvin R. Albe, Jr. (44)           Treasurer, Principal          Executive Vice President, Finance and 
                                  Accounting Officer            Administration, The TCW Group, Inc., Trust 
                                  and Assistant Secretary       Company of the West, TCW Asset Management 
                                                                Company and the Adviser; Senior Vice President,  
                                                                TCW Galileo Funds, Inc.

Philip K. Holl (48)                  Secretary                  Vice President, Associate General Counsel 
                                                                and Assistant Secretary, Trust Company of 
                                                                the West, TCW Asset Management Company and 
                                                                the Adviser; Secretary, TCW Galileo Funds, Inc.;
                                                                Former Vice President/Legal Affairs, the
                                                                Reserve Group of Mutual funds prior to June, 1994.
</TABLE> 

                                      B-12
<PAGE>
 
<TABLE> 
<S>                               <C>                           <C> 
Hilary G.D. Lord (41)             Assistant Secretary           Managing Director, Chief Compliance Officer and 
                                                                Assistant Secretary, Trust Company of the West, 
                                                                TCW Asset Management Company, and the Adviser;
                                                                Senior Vice President and Assistant Secretary, 
                                                                TCW Galileo Funds, Inc.
</TABLE> 

                    INVESTMENT ADVISORY AND OTHER SERVICES

INVESTMENT ADVISER

     The Investment Adviser also serves as investment adviser to a number of
investment compares registered under the 1940 Act and to foreign investment
companies. The registered investment companies to which the Investment Adviser
provides investment advisory services: TCW Galileo Funds, Inc. (including the
following portfolios: TCW Galileo Convertible Securities Fund; TCW Galileo Core
Equity Fund; TCW Small Cap Growth Fund; TCW Mid-Cap Growth Fund; TCW Galileo
Earnings Momentum Fund; TCW Galileo Value Opportunities Fund; TCW Core Fixed
Income Fund; TCW Galileo High Yield Bond Fund; TCW Galileo Money Market Fund;
TCW Galileo Asia Pacific Equities Fund; TCW Galileo Emerging Markets Equities
Fund; TCW Galileo European Equities Fund, TCW Galileo International Equities
Fund, TCW Galileo Japanese Equities Fund; TCW Galileo Latin America Equities
Fund; TCW Galileo Long-Term Mortgage Backed Securities Fund and TCW Galileo
Mortgage Backed Securities Fund); TCW/DW Small Cap Growth Fund; TCW/DW Mid-Cap
Equity Trust; TCW/DW Total Return Trust; TCW/DW Income and Growth Fund; TCW/DW
Global Telecom Trust; TCW/DW Latin American Growth Fund; TCW/DW Emerging Markets
Opportunities Trust; TCW/DW North American Government Income Trust; TCW/DW Term
Trust 2000; TCW/DW Term Trust 2002; TCW/DW Term Trust 2003; Endeavor Series
Trust (Money Market Portfolio and Asset Allocation Portfolio); and The
Enterprise Group of Funds, Inc.

INVESTMENT ADVISORY AND MANAGEMENT AGREEMENT

     The Fund and the Investment Adviser have entered into an Investment
Advisory and Management Agreement (the "Advisory Agreement") which was last
approved by the shareholders of the Fund on May 22, 1996 and by the Board of
Directors of the Fund, including a majority of the directors who were not
interested persons of the Fund, at a meeting of the Board of Directors held on
February 17, 1998.  The Fund has retained the Investment Adviser to manage the
investment of the Fund's assets, to place orders for the purchase and sale of
the Funds portfolio securities and to administer day-to-day operations, subject
to control by the Board of Directors of the Fund.  The Investment Adviser is
responsible for obtaining and evaluating economic, statistical, and financial
data and for formulating and implementing investment programs in furtherance of
the Fund's investment objective and policies.

                                      B-13
<PAGE>
 
     The Investment Adviser furnishes to the Fund office space at such place as
may be agreed upon from time to time and all office facilities, business
equipment, supplies, utilities and telephone service necessary for managing the
affairs and investments and keeping the general accounts and records of the Fund
(exclusive of the necessary records of any transfer agent, registrar, dividend
disbursing or reinvesting agent or custodian) and arranges for officers or
employees of Investment Adviser to serve, without compensation from the Fund, as
officers, directors or employees of the Fund if desired and reasonably required
by the Fund.

     The Advisory Agreement may be continued from year to year if such
continuance is specifically approved at least annually by (1) the Board of
Directors of the Fund or by the vote of a majority of the outstanding voting
securities of the Fund, and (2) the vote of a majority of the directors who are
not "interested persons of the Fund or the Investment Adviser, cast in person at
a meeting called for the purpose of voting on such approval.  The Advisory
Agreement may be terminated without penalty at any time on 60 days' written
notice, by vote of a majority of the Board of Directors of the Fund or by vote
of a majority of the outstanding voting securities of the Fund, or on 90 days'
written notice by the Investment Adviser.  The Advisory Agreement terminates
automatically in the event of assignment.

FEES AND EXPENSES

     As compensation for services rendered, facilities provided and expenses
borne, the Investment Adviser is paid a monthly fee computed at an annual rate
of 0.75% of the first $100,000,000 of the Fund's average net assets, and .50% of
the Fund's average net assets in excess of $100,000,000.  Average net assets are
determined by taking the average of the weekly determinations of net asset value
for each week which ends during the month.  In addition the Fund reimburses the
Investment Adviser for the costs (up to a maximum of $25,000 per year) of
providing accounting services to the Fund, including maintaining the Fund's
financial books and records, calculating its weekly net asset value, and
preparing its financial statements.  For the years ended December 1995, 1996 and
1997, the Investment Adviser received advisory fees of $1,523,587, $1,625,243
and $1,853,979, respectively.  For each of those same years, the Investment
Adviser received reimbursement for accounting services of $25,000.

     Except for expenses specifically assumed by the Investment Adviser under
the Advisory Agreement, the Fund bears all expenses incurred in its operations.
Such Fund expenses include the fee of the Investment Adviser; compensation and
expenses of directors of the Fund who are not affiliated persons of the
Investment Adviser as defined in the 1940 Act; registration, filing and other
fees in connection with filings with regulatory authorities; fees and expenses
of listing and maintaining the listing of the Fund's shares on any national
securities exchange; fees and expenses of independent auditors; the expenses of
printing and mailing proxy statements and shareholder reports; custodian and
transfer and dividend disbursing agent charges; brokerage commissions and
securities transaction costs incurred by the Fund; taxes and corporate fees;
legal fees incurred in connection with the affairs of the Fund; the fees of any
trade association of which the Fund is a member; the cost of stock certificates
representing shares of the Fund; the organizational and offering expenses of the
Fund, whether or not advanced by the Investment Adviser; expenses of shareholder
and director meetings; premiums for the fidelity bond and any errors and
omissions insurance maintained by the Fund; interest and taxes; and any other
ordinary or extraordinary expenses incurred by the Fund in the course of its
business.

                                      B-14
<PAGE>
 
                     PORTFOLIO TRANSACTIONS AND BROKERAGE

GENERAL

     Subject to policies established by the Board of Directors of the Fund, the
Investment Adviser is responsible for the placement of the Fund's portfolio
transactions and the allocation of the brokerage. Total brokerage commissions
paid by the Fund during 1995, 1996 and 1997 were $68,051, $95,728 and $107,022,
respectively. During the fiscal year ended December 31, 1997, $6,518 in
brokerage commissions were paid on transactions with the value of $3,818,292 to
brokers selected primarily on the basis of research and other services provided
to the Investment Adviser and affiliated companies.

     In selecting broker-dealers the Investment Adviser seeks to obtain the best
execution, taking into account such factors as price (including the applicable
dealer spread or commission, if any), size of order, difficulty of execution and
operational facilities of the firm involved and the firm's risk in positioning a
large order. Brokerage services include the ability to most effectively execute
large orders without adversely impacting markets and positioning securities in
order to enable the Investment Adviser to effect orderly sales for clients.
Accordingly, transactions will not always be executed at the lowest available
commission. In addition, the Investment Adviser may effect transactions which
cause the client to pay a commission in excess of a commission which another
broker-dealer would have charged if the Investment Adviser first determines that
such commission is reasonable in relation to the value of the brokerage and
research services provided by the broker-dealer.

     Research services include such items as reports on industries and
companies, economic analyses and review of business conditions, portfolio
strategy, analytic computer software, account performance services, computer
terminals and various trading and/or quotation equipment.  They also include
advice from broker dealers as to the value of securities, availability of
securities, availability of buyers, and availability of sellers.  In addition,
they include recommendations as to purchase and sale of individual securities
and timing of said transactions.

     Fixed income securities are generally purchased from the issuer or a
primary market maker acting as principal on a net basis with no brokerage
commission paid by the client.  Such securities, as well as equity securities,
may also be purchased from underwriters at prices which include underwriting
fees.

     The Investment Adviser maintains an internal allocation procedure to
identify those broker-dealers who have provided it with research services and
endeavors to place sufficient transactions with them to ensure the continued
receipt of research services the Investment Adviser believes are useful.

                                      B-15
<PAGE>
 
     The Directors of Research for the Investment Adviser, after close
consultation with senior management, portfolio managers and research analysts
have the responsibility for determining those broker-dealers with whom business
should be placed.  The Directors evaluate such broker-dealers to consider any
additions or deletions to the list of monitored and consulting analysts.
Allocation guidelines are established to provide direction to the Trading
Department.  Additional allocations also may be authorized for specific broker
dealers depending upon the timeliness and accuracy of their research input. The
head of the Equity Trading Department, with the approval of senior management,
determines the commission rates paid to broker dealers. The Investment Adviser
follows client directions on placing transactions with specific broker-dealers
to some extent and such transactions may be effected at rates or terms specified
or approved by the client.

     Sometimes the Investment Adviser receives products or services which are
used for both research services and other purposes, such as corporate
administration or marketing. The Investment Adviser makes a good faith effort to
determine the relative proportions of such products or services which may be
attributed to research services. The portion attributable to research services
may be paid through client brokerage commissions and the non-research services
portion will be paid in cash by the Investment Adviser.

     Research services furnished by broker-dealers may be used in services for
any or all of the clients of the Investment Adviser, as well as clients of
affiliated companies, and may be used in connection with accounts other than
those which pay commissions to the broker-dealers providing the research
services.

     Usually in the placement of unregistered securities, the issuer or other
seller of the securities pays all costs of the placement including the fee of
any broker-dealer involved. The Fund attempts to make all of its investments in
unregistered securities on this basis. The Fund may pay commissions or
underwriting discounts in connection with its sale of unregistered securities in
privately negotiated transactions or in underwritten public offerings.

     When the Fund and one or more of the other advisory accounts managed by the
Investment Adviser or its affiliates seek to acquire, or to sell, the same
security at the same time, available investments or opportunities for sales will
be allocated in a manner the Investment Adviser believes to be equitable. In
some cases, this procedure may affect adversely the price paid or received by
the Fund or the size of the position purchased or sold by the Fund.

PORTFOLIO TURNOVER

     The Fund's portfolio turnover rates (the lesser of the value of securities
purchased or securities sold, divided by the average value of securities owned
during the year) for the years ended December 31, 1995, 1996 and 1997, were,
108.98%, 125.72% and 132.99%, respectively. For purposes of this calculation,
securities, including options, with a maturity or expiration date at the time of
purchase of one year or less are excluded. The annual turnover rate may vary
greatly from year to year and may exceed 100%, which is higher than that of many
other investment companies. A 100% turnover rate occurs for example, if all the
Fund's portfolio securities are replaced during one year. Such high portfolio
activity (over 100% turnover rate) increases the Fund's transaction costs,
including brokerage commissions.

                                      B-16
<PAGE>
 
                                   TAXATION

FUTURES AND HEDGING TRANSACTIONS

     The stock index futures contracts which the Fund may purchase are "section
1256 contracts" under the Code. With respect to section 1256 contracts closed
out by the Fund, any realized gain or loss will be treated as long-term capital
gain or loss to the extent of 60% thereof and short-term capital gain or loss to
the extent of 40% thereof (hereinafter "60/40 gain or loss"). Open section 1256
contracts held by the Fund on December 31 of any tax year will be required to be
treated as sold at market value on such day for Federal income tax purposes
(i.e, "marked-to-market"). Gain or loss recognized under this marked-to-market
rule is 60/40 gain or loss.

     Certain of the hedging transactions undertaken by the Fund (i.e., the
writing of covered call options, the acquisition of put options on its stocks
and short sales) may constitute "straddles" for Federal income tax purposes.  
The Code generally provides with respect to straddles (1) "loss deferral" rules
which may postpone recognition for tax purposes of losses from certain closing
purchase transactions or other dispositions of a position in a straddle to the
extent of unrealized gains in the offsetting position, (2) "wash sale" rules
which may postpone recognition for tax purposes of losses when a position
forming part of a straddle is sold and a new offsetting position is acquired
within a prescribed period, and (3) "short sale" rules which may terminate the
holding period of securities owned by the Fund when offsetting positions are
established and which may convert certain losses from short-term to long-term.
Because only a few regulations implementing the straddle rules have been
promulgated, the tax consequences of certain hedging transactions to the Fund
are not entirely clear.  Straddle transactions may increase the amount of short-
term capital gain realized by the Fund which is taxable as ordinary income when
distributed to shareholders.

     Because application of the straddle rules may affect the character of gains
or losses, defer losses and/or accelerate the recognition of gains or losses
from the affected straddle positions, the amount which must be distributed to
shareholders, and which will be taxed to shareholders as ordinary income or 
long-term capital gain, may be increased or decreased substantially as compared
to a fund that does not engage in such hedging transactions.


                      PRINCIPAL SHAREHOLDERS OF THE FUND

     On December 31, 1997, Cede & Co., Box 20, Bowling Green Station, New York,
New York 10004, held 27,477,665 shares (86.15%) of the Fund as nominee for the
beneficial owners.

     On December 31, 1997, all officers and directors of the Fund, as a group,
owned less than 1% of the outstanding shares of common stock.

                                      B-17
<PAGE>
 
 
[LOGO OF TCW(R)] TCW CONVERTIBLE
                 SECURITIES FUND, INC.
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
DIRECTORS AND OFFICERS
Ernest O. Ellison              Coleman W. Morton
President and Director         Director
John C. Argue                  Charles A. Parker
Director                       Director
Norman Barker, Jr.             Lawrence J. Sheehan
Director                       Director
Richard W. Call                Robert G. Sims
Director                       Director

Ronald E. Robison              David K. Sandie
Senior Vice President and      Principal Accounting
Chief Operating Officer        Officer, Treasurer and 
Robert M. Hanisee              Assistant Secretary
Senior Vice President          Philip K. Holl
Kevin A. Hunter                Secretary
Senior Vice President          Marie M. Bender
Thomas E. Larkin, Jr.          Assistant Secretary
Senior Vice President          Michael E. Cahill 
Hilary G.D. Lord               General Counsel and 
Senior Vice President          Assistant Secretary  
and Assistant Secretary        Peter C. DiBona
                               Assistant Treasurer
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
SHAREHOLDER INFORMATION
INVESTMENT ADVISER
TCW Funds Management, Inc.
865 South Figueroa Street
Los Angeles, California 90017
 
- --------------------------------------------------------------------------------
TRANSFER AGENT, DIVIDEND REINVESTMENT
AND DISBURSING AGENT AND REGISTRAR
The Bank of New York
Church Street Station
P.O. Box #11002
New York, New York 10277-0770
 
- --------------------------------------------------------------------------------
CUSTODIAN
Custodial Trust Company
101 Carnegie Center
Princeton, NJ 08540
 
- --------------------------------------------------------------------------------
INDEPENDENT AUDITORS
Deloitte & Touche LLP
1000 Wilshire Boulevard
Los Angeles, California 90017
 
- --------------------------------------------------------------------------------
LEGAL COUNSEL
O'Melveny & Myers LLP
400 S. Hope Street
Los Angeles, California 90071
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
TCW CONVERTIBLE 
SECURITIES FUND, INC.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
ANNUAL REPORT
DECEMBER 31, 1997
 
 
 
                                                               [LOGO OF TCW(R)]
 
 
- -------------------------------------------------------------------------------

<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     The President's Letter
[LOGO OF TCW]
- -------------------------------------------------------------------------------
DEAR SHAREHOLDER:
 
  1997 was a superb year for the domestic financial markets, but ended in
turmoil. The Asian crisis caused considerable consternation among U.S.
investors. As a result, stock prices corrected in October and there has been
an increase in stock market volatility. Despite the gyrations of the fourth
quarter, the S&P500 recorded its third straight year of greater than 20%
returns. In addition, the end of 1997 marked the best ten-year period on
record for returns on the Dow Jones average. Bonds also joined the party with
both high grade and high yield issues generating returns well in excess of
their coupons. Convertibles performed well in this environment, with most
convertible indices generating returns of 17% to 19%.
 
PERFORMANCE OF THE FUND'S SHARES
 
  During 1997, the Fund's shareholders realized a total return of 13.0% (with
dividends reinvested). This included four regular quarterly distributions of
$0.21 per share and an additional year-end distribution of $0.03 per share for
a total of $0.87 per share. Of this amount, $0.37 per share was classified as
ordinary income and $0.50 per share was classified as long-term capital gain
for federal tax purposes. The market value of the Fund's shares was $9.375 at
the beginning of the year and ended 1997 at $9.625. The per share market value
of $9.625 represented a premium of 4.51% to the Fund's net asset value ("NAV")
of $9.21. The contraction of the Fund's premium over NAV from 10.2% to 4.5%
during 1997 caused the return to shareholders of 13.0% to be below the return
on NAV which was 19.1%.
 
THE CONVERTIBLE MARKET
 
  The convertible market remains a dynamic and rewarding area for investment.
Although convertibles have lagged the spectacular performance of the S&P 500
during the last three years, over the long term convertibles continue to
capture a significant portion of the upside of stocks while providing lower
volatility and significant protection of capital. With the market in the midst
of a period of tremendous uncertainty, it is likely that returns will be lower
in 1998 than they have been during the past three years. With their relatively
higher yield, participation with equities on the upside and defensive
qualities, convertible securities should be positioned to provide very
competitive returns compared to equities going forward.
 
  The new issue market posted a record year for dollar volume in 1997. During
the year, a total of 140 issues with a net value of $28.0 billion came to
market. New issuance exceeded redemptions and led to a small increase in the
total size of the U.S. convertible market to approximately $137 billion. New
issue terms varied considerably during the year. While many issues were priced
attractively, terms became aggressive during the middle of the year. The most
dramatic change was an increase in conversion premiums to a range of 30%-70%.
In 1997, 22 issues with a market value of $7.4 billion were issued with high
conversion premiums. We did not find many of these issues attractive and
participated in only a limited number of them. For the high premium issues
which we did purchase, the bond value combined with an attractive stock have
the potential to lead to annualized mid-teens returns on the upside with very
low downside risk.
 
  The other positive trend in new issue terms, which is positive, is the
continued shortening of maturities. The average convertible issued during 1997
had a 6.8 year maturity and was issued at a 26.3% premium over bond value.
With interest rates declining, these short maturity bonds will provide
substantial downside protection should the underlying stocks decline.
 
                                    TABLE 1
                          NEW ISSUE CONVERTIBLE BONDS
                     MATURITY/PREMIUM TO INVESTMENT VALUE
 
<TABLE>
<CAPTION>
                                         1990 1991 1992 1993 1994 1995 1996 1997
                                         ---- ---- ---- ---- ---- ---- ---- ----
<S>                                      <C>  <C>  <C>  <C>  <C>  <C>  <C>  <C>
Average Maturity (Years)*............... 15.0 10.3  9.2  9.4  8.2  7.2  7.0  6.8
% Premium to Investment Value........... 98.7 33.6 26.9 27.8 23.9 24.4 31.3 26.3
</TABLE>
- --------
 *New Issue Convertible Bonds
Source: Salomon Smith Barney
 
                                       1
<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     The President's Letter (continued)
[LOGO OF TCW]
- -------------------------------------------------------------------------------
 
FUND PERFORMANCE AND STRATEGY
 
  The Fund's underlying investment performance in 1997 exceeded that of the
convertible benchmarks. While the Fund's performance was lower than that of
the S&P 500, it was very competitive with that of the NASDAQ.
 
                                    TABLE 2
                               FUND PERFORMANCE
 
<TABLE>
<CAPTION>
                                                                           1997
                                                                          ------
<S>                                                                       <C>
TCW Convertible Securities Fund, Inc. ................................... 19.1%*
First Boston Convertible Securities Index................................ 16.9%
Lipper average of convertible mutual funds............................... 17.6%*
Standard & Poors 500..................................................... 33.4%
NASDAQ................................................................... 21.6%
</TABLE>
- --------
 *Returns are net of management fees and expenses.
 
  Most of the incremental relative performance of the Fund was generated
during the turbulent fourth quarter. While the convertible benchmarks declined
between 1.4% and 2.8% the Fund generated a positive return. The performance
was, in part, due to the Fund's lower exposure to technology and energy. These
industries are heavily weighted in the convertible universe and were down
significantly.
 
                                    TABLE 3
                             INDUSTRY PERFORMANCE*
 
<TABLE>
<CAPTION>
                                                                   Total Returns
                                                                       4Q97
                                                                   -------------
<S>                                                                <C>
Oil & Gas Products................................................     (5.6%)
Integrated Oil - Domestic.........................................     (3.9%)
Integrated Oil - Foreign..........................................     (5.4%)
Oil Services......................................................     (5.6%)
Computer Hardware.................................................     (0.9%)
Electronics - Semiconductors......................................     (7.2%)
Electronics - Instrumentation.....................................    (12.0%)
</TABLE>
- --------
 *Source: Merrill Lynch
 
  The Fund began the year most heavily weighted in the consumer staples and
capital goods sector. The Fund was relatively under weighted in the consumer
cyclical, basic industry and credit sensitive sectors. Within the consumer
staples sector, the largest industry weightings are in media, health care,
business services and retail. We believe that in a moderating economy, these
industries should show very good relative growth. While retail might be
expected to slow in a moderating economy, the consumer appears to be in good
shape and continues to spend. In the capital goods sector, weightings were
reduced somewhat during the year. More importantly, the Fund's commitment to
technology decreased as the year progressed. As holdings in technology were
sold, the Fund added investments in telecommunications. The basic industrial
sector continues to be under weighted. Most industries in this sector have low
unit growth and little pricing flexibility. Furthermore, many Asian companies
in this sector may flood their respective markets with low cost products
increasing already intense competition. The weighting in the credit sensitive
sector declined as the Fund liquidated some of its holdings in REITs and the
insurance industry.
 
                                    TABLE 4
                              SECTOR ALLOCATION*
 
<TABLE>
<CAPTION>
                                                       December 31, December 31,
                                                           1996         1997
                                                       ------------ ------------
<S>                                                    <C>          <C>
Consumer Staples......................................    48.9%        56.1%
Capital Goods.........................................    33.3%        26.3%
Consumer Cyclicals....................................     1.1%         1.2%
Basic Industries......................................     5.6%         7.2%
Credit Sensitive......................................    13.0%         6.6%
</TABLE>
- --------
 *As a percentage of net assets.
 
  During 1997, the Fund benefitted from holdings in a diverse group of securi-
ties. The best performing industry was cable. After three years of under-per-
formance, the group performed spectacularly. Holdings in Telecommunications
Inc., U.S. West Media, Cox Communications and Time Warner all did well. In ad-
dition to cable, the Fund realized significant profits on several technology
holdings such as Altera, Analog Devices and Quantum Corp. The Fund's holding
in Cisco Systems also
 
                                       2
<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     The President's Letter (continued)
[LOGO OF TCW]
- -------------------------------------------------------------------------------
 
appreciated significantly during the year. Other holdings which added
significant performance included Sepracor, SFX Broadcasting, Home Depot,
Hexcel and Staples. The excellent performance of these securities offset some
disappointments. In particular, significant holdings in Motorola, U.S. Filter,
Thermo Electron, Xilinx and Safeguard Scientific under performed. However, we
believe that after a year's hiatus, all of these holdings should do well in
1998.
 
  The Fund's strategy continues to emphasize companies which can show good
earnings growth in a moderately growing economy. It is expected that the Fund
will continue to invest in media, health care, technology, telecommunications
and business and financial services where growth prospects appear promising.
There still appears to be little reason to invest in most basic industries
with the exception of energy. During the last three to four months, many
energy stocks have declined significantly and now appear attractive. In
addition, with current market volatility high and the tremendous uncertainty
created by the Asian economic crisis, the Fund remains committed to selling
most convertibles as they become equity equivalents and reinvesting the
proceeds in convertibles which have good downside protection via short
maturities or relatively high yields.
 
ECONOMIC/MARKET OUTLOOK
 
  Intermediate and long term interest rates fell significantly in 1997 and
continue to do so in 1998. The Asian crisis should lower worldwide GDP growth
in 1998 and lead to lower prices for many basic industrial goods and imported
products. This should take some pressure off of inflation and lead to lower
interest rates. Several prognosticators are now forecasting that thirty-year
U.S. Treasury rates will fall to 5.0% by year-end 1998. While this may be
optimistic, at least one cut in the Fed Funds rate seems likely and long term
yields could fall to a range of 5.25%-5.50% by the second half of 1998.

                                    TABLE 5
                        U.S. TREASURY SECURITIES YIELD
 
<TABLE>
<CAPTION>
                                         3 mo  1 yr  3 yr   5 yr   10 yr  30 yr
                                         ----  ----  -----  -----  -----  -----
<S>                                      <C>   <C>   <C>    <C>    <C>    <C>
12/31/96................................ 5.18% 5.49%  6.02%  6.21%  6.42%  6.64%
12/31/97................................ 5.35% 5.49%  5.67%  5.71%  5.74%  5.92%
Change in
 Basis Points........................... 0.17  0.00  (0.35) (0.50) (0.68) (0.72)
</TABLE>
 
  In 1997, the U.S. enjoyed strong real growth led by a capital spending boom,
rising real incomes and strong corporate profitability. With unemployment at
4.6%, rising pressure on inflation might be expected, but surprisingly
inflation was at its lowest level in three decades and interest rates fell.
While it is expected that problems in Asia will reduce U.S. real growth by
between 0.5% and 0.75%, the U.S. economy should still grow between 2%-3%. Thus
far, the problems in Asia have affected price levels and interest rates rather
than U.S. economic growth. In all likelihood, the impact of the Asian turmoil
on economic growth should be felt during the first half of 1998.
 
  While a massive international effort is underway to try to contain the
crisis, there can be no assurance that the worst is over. A sovereign debt
default or an adjustment of the Hong Kong peg could have serious repercussions
and further depress worldwide equity markets. Perhaps the biggest impact of
the Asian crisis on the U.S. will be to pressure profitability of U.S.
corporations. A flood of low-priced imports could enter U.S. markets in 1998.
The combination of slower revenue growth due to a moderating economy, import
competition and higher wage rates could pressure profit margins thus leading
to earnings disappointments. The critical question for investors is whether
higher P/E ratios due to lower inflation and interest rates will offset the
deterioration in corporate profit growth.
 
                                       3
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     The President's Letter (continued)
[LOGO OF TCW]
- --------------------------------------------------------------------------------
 
  While it is impossible to predict the outcome of the turmoil in Asia, it is
clear the environment for equities has become more uncertain. During the next
few months, world equity markets are likely to remain volatile. The U.S. equity
market seems to have entered a period of adjustment. While lower interest rates
may mute the impact of lower earnings on stock prices, it seems that a fourth
year of equity returns above 20% is unlikely. Our best guess is that returns
will regress toward the long term mean of 10% with risk to the downside if the
Asian crisis is not contained or corporate earnings growth turns negative. In
this type of an environment, convertibles should provide competitive returns
relative to equities with significant downside protection.
 
RIGHTS OFFERING
 
  The Fund launched a rights offering earlier this year. The offering was fully
subscribed and the Fund received the proceeds of approximately $51.6 million in
mid-May. These proceeds were invested promptly on behalf of the Funds
investors. This proved to be fortuitous because the market has risen
substantially since the proceeds were invested. Investors were able to purchase
new shares at $8.09. These shares were worth $9.625 at December 31, 1997 and
taking into account the quarterly dividends of $0.21 per share and the
additional $0.03 distribution at year end, the return to investors has been
27.7% on these newly issued shares (including dividend reinvestment).
 
DIVIDEND REINVESTMENT PLAN
 
  Shareholders who wish to add to their investment may do so through the
Dividend Reinvestment Plan. Under the Plan, your dividend is used to purchase
shares on the open market whenever shares and the related sales commission are
selling below the per share Net Asset Value. If the market price, including
commission on the share, is selling above the Net Asset Value, you will receive
shares at a price equal to the higher of the Net Asset Value per share on the
payment date or 95% of the closing market price.
 
  To enroll in the Plan, if your shares are registered in your name, write to
the Bank of New York, Church Street Station, P. O. Box #11002, New York, New
York, 10277-0770, or call their toll free number (800) 524-4458. If your shares
are held by a brokerage firm, please call your broker. If, however, you need
assistance please call our investor relations department at (800) 386-3829. As
always, we would be pleased to accommodate your investment needs.
 
                    Sincerely,

                    /s/ Ernest O. Ellison
                    Ernest O. Ellison
                    President and Director
 
                    February 3, 1998
 
                                       4
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Schedule of Investments
     December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal
   Amount                                                             Value
 ---------                                                            -----
 <C>        <S>                                                    <C>
            CONSUMER STAPLES (56.1% OF NET ASSETS)
            DRUGS AND HOSPITAL SUPPLY (2.4%)
 $5,465,000 Sandoz Capital BVI, Ltd., (Switzerland), 2%, due
             10/06/02...........................................   $ 8,375,113*
                                                                   -----------
            ENTERTAINMENT, LEISURE AND MEDIA (11.9%)
 $1,500,000 Activision, Inc., 6.75%, due 01/01/05...............     1,597,500*
     84,100 Evergreen Media Corp., $3.00 Convertible Preferred..     6,622,875*
      9,300 Golden Books Family Entertainment, Inc., $4.375
             Convertible Preferred..............................       492,900
     52,500 Golden Books Family Entertainment, Inc., $4.375
             Convertible Preferred..............................     2,782,500*
    209,500 Houston Industries, Inc., Exchangeable Time Warner,
             $3.215 Convertible Preferred.......................    11,954,594
    166,700 Merrill Lynch & Company, Inc., Exchangeable Cox
             Communications, Inc., $1.3725 Convertible
             Preferred..........................................     5,646,963
     48,100 TCI Pacific Communications, Inc., $5.00 Convertible
             Preferred..........................................     7,918,463
     85,400 U.S. West, Inc., Exchangeable U.S. West Media Group,
             $2.25 Convertible Preferred........................     5,268,113
                                                                   -----------
            Total Entertainment, Leisure and Media..............    42,283,908
                                                                   -----------
</TABLE>
<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal
   Amount                                                             Value
 ---------                                                            -----
 <C>        <S>                                                    <C>
            FOODS, HOTELS AND RESTAURANTS (3.1%)
     69,200 Apple South, Inc., $3.50
             Convertible Preferred..............................   $ 3,758,425*
     63,500 Host Marriott Financial Trust,
             $3.375 Convertible Preferred.......................     3,810,000*
 $3,530,000 Signature Resort, 5.75%, due 01/15/07...............     3,596,188
                                                                   -----------
            Total Foods, Hotels and Restaurants.................    11,164,613
                                                                   -----------
            HEALTHCARE (15.5%)
 $6,205,000 Alternative Living Services, Inc., 5.25%, due
             12/15/02...........................................     7,228,825
 $1,920,000 Alternative Living Services, Inc.,
             7%, due 06/01/04...................................     2,822,400*
 $4,625,000 Assisted Living Concepts, Inc.,
             6%, due 11/01/02...................................     5,018,125
 $9,595,000 Athena Neurosciences, Inc.,
             Exchangeable Elan Corp. PLC (Ireland), 4.75%, due
             11/15/04...........................................     9,606,994*
 $3,720,000 Atria Communities, Inc., 5%, due 10/15/02...........     3,775,800*
     77,400 Laboratory Corp. of America Holdings, $4.25
             Convertible Preferred..............................     3,579,750
 $3,020,000 Morgan Stanley Group, Inc., Exchangeable Johnson &
             Johnson, 2%, due 03/29/02..........................     3,608,900
 $3,910,000 OccuSystems, Inc., 6%, due 12/15/01.................     5,469,113*
 $6,380,000 Omnicare, Inc., 5%, due 12/01/07....................     6,419,875*
</TABLE>

* Restricted security. (See Note 8)
 
See accompanying Notes to Financial Statements.
 
                                       5
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Schedule of Investments (continued)
     December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  Number of
  Shares or
  Principal
   Amount                                                            Value
  ---------                                                          -----
 <C>         <S>                                                  <C>
 $   510,000 Quintiles Transnational Corp., 4.25%, due
              05/31/00.........................................   $   573,750
 $ 2,880,000 Quintiles Transnational Corp., 4.25%, due
              05/31/00.........................................     3,240,000*
 $ 2,815,000 Sunrise Assisted Living, Inc., 5.5%, due 06/15/02.     3,701,725*
                                                                  -----------
             Total Healthcare..................................    55,045,257
                                                                  -----------
             RETAIL (8.2%)
 $12,250,000 Costco Companies, Inc., 0%,
              due 08/19/17.....................................     7,304,063*
 $ 6,665,000 Home Depot, Inc., 3.25%, due 10/01/01.............     8,931,100
      65,400 Kmart Corp., $3.875 Convertible Preferred.........     3,376,275
 $ 7,085,000 Staples, Inc., 4.5%, due 10/01/00.................     9,369,913*
                                                                  -----------
             Total Retail......................................    28,981,351
                                                                  -----------
             RETAIL FOOD AND DRUG (1.9%)
 $ 6,250,000 Rite Aid Corp, 5.25%, due 09/15/02................     6,750,000*
                                                                  -----------
             SERVICES--BUSINESS (13.1%)
 $ 8,935,000 Cendant Corp., 4.75%, due 03/01/03................    11,928,225
 $ 4,925,000 Corestaff, Inc., 2.94%, due 08/15/04..............     4,106,219
 $ 1,200,000 CUC International, Inc., 3%, due 02/15/02.........     1,504,500
 $ 1,000,000 CUC International, Inc., Reg S, 3%, due 02/15/02..     1,253,750
 $ 8,845,000 CUC International, Inc., 3%, due 02/15/02.........    11,089,419*
 $ 4,955,000 Omnicon Group, Inc., 4.25%, due 01/03/07..........     6,788,350*
 $ 3,150,000 Personnel Group of America, Inc., 5.75%, due
              07/01/04.........................................     3,587,063*
 $ 3,295,000 SmarTalk Teleservices, Inc., 5.75%, due 09/15/04..     3,521,531*
</TABLE>
<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal
   Amount                                                            Value
 ---------                                                           -----
 <C>        <S>                                                   <C>
     56,200 Snyder Communications, Inc., $1.6778 Convertible
             Preferred.........................................   $  1,910,800
     10,000 Vanstar Corp., $3.375 Convertible Preferred........        368,750
     15,000 Vanstar Corp., $3.375 Convertible Preferred........        553,125*
                                                                  ------------
            Total Services--Business...........................     46,611,732
                                                                  ------------
            TOTAL CONSUMER STAPLES (Cost: $166,342,771)........    199,211,974
                                                                  ------------
            CONSUMER CYCLICALS
             (COST: $3,965,000) (1.2%)
            AUTOMOTIVE (1.2%)
 $3,965,000 Tower Automotive, Inc., 5%, due 08/01/04...........      4,123,600*
                                                                  ------------
            CAPITAL GOODS (26.3%)
            AEROSPACE AND CONGLOMERATES (3.4%)
 $3,215,000 Morgan Stanley Group, Inc., Exchangeable Boeing
             Company, 0%, due 09/30/00.........................      3,600,800
 $3,145,000 Hexcel Corp., 7%, due 08/01/03.....................      5,157,800
 $1,875,000 Titan Corp., 8.25%, due 11/01/03...................      3,363,281
                                                                  ------------
            Total Aerospace and Conglomerates..................     12,121,881
                                                                  ------------
            ELECTRICAL INSTRUMENTS AND COMMUNICATION EQUIPMENT
             (4.2%)
 $4,790,000 Premiere Technologies, Inc., 5.75%, due 07/01/04...      4,999,563*
 $1,630,000 Tel-Save Holdings, Inc., 4.5%, due 09/15/02........      1,572,950*
 $8,600,000 Tel-Save Holdings, Inc., 5%, due 12/15/04..........      8,159,250*
                                                                  ------------
            Total Electrical Instruments and Communication
             Equipment.........................................     14,731,763
                                                                  ------------
</TABLE>
 
* Restricted security. (See Note 8)
See accompanying Notes to Financial Statements.
 
                                       6
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Schedule of Investments (continued)
     December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  Number of
  Shares or
  Principal
   Amount                                                             Value
  ---------                                                           -----
 <C>         <S>                                                   <C>
             ELECTRONICS--SEMICONDUCTORS AND INSTRUMENTS (0.9%)
 $ 3,000,000 Adaptec, Inc., 4.75%, due 02/04/04.................   $ 3,090,000*
                                                                   -----------
             INFORMATION PROCESSING (5.0%)
      72,100 Morgan Stanley Group, Inc., Exchangeable Cisco
              Systems, Inc., $4.00 Convertible Preferred........     6,633,200
 $ 6,585,000 Safeguard Scientifics, Inc., 6%, due 02/01/06......     7,416,356*
 $ 3,575,000 Wind River Systems, Inc., 5%, due 08/01/02.........     3,811,844*
                                                                   -----------
             Total Information Processing.......................    17,861,400
                                                                   -----------
             OFFICE EQUIPMENT & SUPPLIES (1.0%)
 $ 3,740,000 Xerox Corp., 2.875%, due 07/01/02..................     3,665,200
                                                                   -----------
             POLLUTION CONTROL (8.5%)
 $ 8,050,000 Thermo Electron Corp., 4.25%, due 01/01/03.........    10,143,000*
 $11,645,000 United States Filter Corp., 4.5%, due 12/15/01.....    12,052,575
 $ 7,245,000 USA Waste Systems, Inc., 4%, due 02/01/02..........     7,933,275
                                                                   -----------
             Total Pollution Control............................    30,128,850
                                                                   -----------
             TELECOMMUNICATION EQUIPMENT (3.3%)
 $15,265,000 Motorola, Inc., 0%, due 09/27/13...................    11,620,481
                                                                   -----------
             TOTAL CAPITAL GOODS (Cost: $85,224,953)............    93,219,575
                                                                   -----------
</TABLE>
<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal
   Amount                                                             Value
 ---------                                                            -----
 <C>        <S>                                                    <C>
            BASIC INDUSTRIES (7.2%)
            ENERGY AND OIL SERVICES (5.0%)
 $6,560,000 Baker Hughes, Inc., 0%, due 05/05/08................   $ 5,608,800
 $1,535,000 Diamond Offshore Drill, 3.75%, due 02/15/07.........     2,076,088
     79,300 EVI, Inc., $2.50 Convertible Preferred..............     3,657,713*
 $3,040,000 Loews Corp., Exchangeable Diamond Offshore Drill,
             3.125%, due 09/15/07...............................     2,941,200
     61,400 Unocal Corp., $3.125 Convertible Preferred..........     3,469,100
                                                                   -----------
            Total Energy and Oil Services.......................    17,752,901
                                                                   -----------
            OIL AND GAS-INTERNATIONAL (0.7%)
     31,100 Occidental Petroleum Corp., Exchangeable Canadian
             Occidental Petroleum, $3.00 Convertible Preferred
             (Canada)...........................................     2,581,300
                                                                   -----------
            PAPER AND PACKAGING (0.8%)
 $3,030,000 Metsa-Serla OYJ, (Finland), 4.375%, due 10/15/02....     2,772,450*
                                                                   -----------
            TRANSPORTATION (0.7%)
 $2,345,000 Halter Marine Group, Inc., 4.5%, due 09/15/04.......     2,532,600*
                                                                   -----------
            TOTAL BASIC INDUSTRIES (Cost: $24,979,264)..........    25,639,251
                                                                   -----------
</TABLE>

* Restricted security. (See Note 8)
See accompanying Notes to Financial Statements.
 
                                       7
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Schedule of Investments (continued)
     December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal
   Amount                                                              Value
 ---------                                                             -----
 <C>        <S>                                                     <C>
            CREDIT SENSITIVE (6.6%)
            BUILDING, REAL ESTATE AND REIT'S (1.8%)
 $2,365,000 LTC Properties, Inc., 8.25%, due 07/01/01............   $ 2,908,950
 $2,590,000 LTC Properties, Inc., 8.5%, due 01/01/01.............     3,545,063
                                                                    -----------
            Total Building, Real Estate and REIT's...............     6,454,013
                                                                    -----------
            INSURANCE (1.2%)
    101,100 Salomon, Inc., Exchangeable Financial Security
             Assurance Holdings, Ltd., $2.30 Convertible
             Preferred...........................................     4,119,825
                                                                    -----------
            SERVICES-FINANCIAL, BANKING AND MISCELLANEOUS (3.6%)
    101,300 National Australia Bank, Ltd. (Australia), $1.96875
             Convertible Preferred...............................     2,868,056
     82,500 SunAmerica Corp., $3.188 Convertible Preferred.......     3,841,406
    182,700 Westpac Holdings Corp., Ltd., (Australia) $3.135
             Convertible Preferred...............................     6,120,444
                                                                    -----------
            Total Services-Financial, Banking and Miscellaneous..    12,829,906
                                                                    -----------
            TOTAL CREDIT SENSITIVE (Cost: $19,173,209)...........    23,403,744
                                                                    -----------
</TABLE>
 
<TABLE>
<CAPTION>
  Principal
   Amount                                                            Value
 -----------                                                         -----
 <C>         <S>                                                  <C>
             REPURCHASE AGREEMENTS (6.0%)
 $   118,831 Stock Loan Repurchase, Bear Stearns & Co., Inc.,
              dated 12/31/97, 3.375%, due 01/02/98
              (collateralized by $125,000 U.S. Treasury Bill,
              valued at $123,855)..............................   $    118,831
 $ 4,863,670 Stock Loan Repurchase, Bear Stearns & Co., Inc.,
              dated 12/31/97, 6.875%, due 01/02/98
              (collateralized by $5,000,000 U.S. Treasury Bill,
              valued at $4,964,800)............................      4,863,670
 $16,454,887 Cash Repurchase Agreement, Bear Stearns & Co.,
              Inc., dated 12/31/97, 6.25%, due 01/02/98
              (collateralized by $16,935,000 U.S. Treasury
              Bill, valued at $16,786,555).....................     16,454,887
                                                                  ------------
             TOTAL REPURCHASE AGREEMENTS (COST: $21,437,388)...     21,437,388
                                                                  ------------
             TOTAL INVESTMENTS (103.4%) (COST: $321,122,585)...    367,035,532
                                                                  ------------
             EXCESS OF LIABILITIES OVER OTHER ASSETS (-3.4%)...    (11,974,261)
                                                                  ------------
             NET ASSETS (100%).................................   $355,061,271
                                                                  ============
</TABLE>

* Restricted security. (See Note 8)
See accompanying Notes to Financial Statements.
 
                                       8
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Statement of Assets and Liabilities
     December 31, 1997
[LOGO OF TCW] 
- --------------------------------------------------------------------------------
<TABLE>
<S>                                                               <C>
ASSETS:
  Investments at Value (Cost $321,122,585) (Note 1).............. $367,035,532
  Interest and Dividends Receivable..............................    2,761,813
                                                                  ------------
    Total Assets.................................................  369,797,345
                                                                  ------------
LIABILITIES:
  Payable upon Return of Securities Loaned (Note 5)..............    4,982,501
  Distributions Payable..........................................    9,254,707
  Accrued Investment Advisory and Service Fees (Note 3)..........      335,323
  Accounts Payable...............................................      163,543
                                                                  ------------
    Total Liabilities............................................   14,736,074
                                                                  ------------
NET ASSETS....................................................... $355,061,271
                                                                  ============
Net Assets were comprised of:
  Common Stock, par value $0.01 per share, (50,000,000 shares 
   authorized, 38,561,279 shares issued and outstanding)......... $    385,613
  Paid-in Capital................................................  342,125,181
  Distribution of Paid-in Capital (Note 1).......................  (34,179,879)
  Net Unrealized Appreciation of Investments.....................   45,912,947
  Undistributed Net Realized Gains on Investments................      817,409
                                                                  ------------
NET ASSETS....................................................... $355,061,271
                                                                  ============
NET ASSET VALUE PER SHARE........................................ $       9.21
                                                                  ============
</TABLE>
 
See accompanying Notes to Financial Statements.
 
                                       9
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Statement of Operations
     Year Ended December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------
<TABLE>
<S>                                                                  <C>
INVESTMENT INCOME:
  Interest (Note 1) (including security lending fees of $54,242).... $10,209,331
  Dividends (Note 1)................................................   4,805,938
                                                                     -----------
    Total Investment Income.........................................  15,015,269
                                                                     -----------
EXPENSES:
  Investment Advisory Fees (Note 3).................................   1,853,979
  Custodian Fees....................................................     119,271
  Transfer Agent Fees...............................................      85,000
  Directors' Fees and Expenses (Note 6).............................      75,000
  Proxy Costs.......................................................      65,000
  Printing and Distribution Costs...................................      50,000
  Listing Fees......................................................      33,478
  Audit and Tax Service Fees........................................      30,000
  Accounting and Other Service Fees (Note 3)........................      25,000
  Insurance Costs...................................................      14,741
  Business Tax Fees.................................................      10,585
  Legal Fees (Note 6)...............................................       5,840
  Miscellaneous.....................................................       2,562
                                                                     -----------
    Total Expenses..................................................   2,370,456
                                                                     -----------
    Net Investment Income...........................................  12,644,813
                                                                     -----------
NET REALIZED GAINS AND CHANGE IN UNREALIZED APPRECIATION
 OF INVESTMENTS:
  Net Realized Gains on Investments.................................  19,760,433
  Change in Unrealized Appreciation of Investments..................  29,491,278
                                                                     -----------
    Net Realized Gains and Change in Unrealized
     Appreciation of Investments....................................  49,251,711
                                                                     -----------
INCREASE IN NET ASSETS RESULTING FROM OPERATIONS.................... $61,896,524
                                                                     ===========
</TABLE>
 
See accompanying Notes to Financial Statements.
 
                                       10
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Statements of Changes in Net Assets
[LOGO OF TCW]
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                               Year Ended        Year Ended
                                            December 31, 1997 December 31, 1996
                                            ----------------- -----------------
<S>                                         <C>               <C>
INCREASE (DECREASE) IN NET ASSETS:
Operations:
  Net Investment Income....................   $ 12,644,813      $ 11,278,914
  Net Realized Gains on Investments........     19,760,433        24,933,292
  Change in Unrealized Appreciation
   (Depreciation) of Investments...........     29,491,278          (382,158)
                                              ------------      ------------
    Increase in Net Assets Resulting from
     Operations............................     61,896,524        35,830,048
                                              ------------      ------------
Distributions to Shareholders:
  From Net Investment Income...............    (12,644,813)      (11,278,914)
  From Net Realized Gains on Investments...    (19,482,548)      (19,904,764)
                                              ------------      ------------
    Total Distributions to Shareholders....    (32,127,361)      (31,183,678)
                                              ------------      ------------
Capital Share Transactions:
  Shares Issued through Exercise of Common
   Stock Subscription Rights (6,396,283)
   (Note 9)................................     51,583,087               --
  Shares Issued in Reinvestment of
   Dividends (270,747 for the year ended
   December 31, 1997 and 233,869 for the
   year ended December 31, 1996)...........      2,442,324         2,012,418
                                              ------------      ------------
    Total Increase in Net Assets...........     83,794,574         6,658,788
NET ASSETS:
Beginning of Year..........................    271,266,697       264,607,909
                                              ------------      ------------
End of Year................................   $355,061,271      $271,266,697
                                              ============      ============
</TABLE>
 
See accompanying Notes to Financial Statements.
 
                                       11
<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Notes to Financial Statements
[LOGO OF TCW]
- -------------------------------------------------------------------------------
NOTE 1--SIGNIFICANT ACCOUNTING POLICIES:
 
 TCW Convertible Securities Fund, Inc. (the "Fund") was incorporated in Mary-
land on January 13, 1987 as a diversified, closed-end management investment
company and is registered under the Investment Company Act of 1940, as amend-
ed. The Fund commenced operations on March 5, 1987. The Fund's investment ob-
jective is to seek a total investment return, comprised of current income and
capital appreciation through investment principally in convertible securities.
 
 The preparation of the accompanying financial statements requires management
to make estimates and assumptions that affect the reported amounts of assets
and liabilities at the date of the financial statements and the reported
amounts of income and expenses during the reporting period. Actual results
could differ from those estimates.
 
 The following is a summary of the significant accounting policies
consistently followed by the Fund in the preparation of its financial
statements. The policies are in conformity with generally accepted accounting
principles.
 
SECURITY VALUATION: Securities traded on national exchanges are valued at the
last reported sales price or the mean of the current bid and asked prices if
there are no sales in the trading period immediately preceding the time of de-
termination. Other securities which are traded on the over-the-counter market
are valued at the mean of the current bid and asked prices. Short-term debt
securities with maturities of 60 days or less at the time of purchase are val-
ued at amortized cost. Securities for which quotations are not readily avail-
able and unregistered securities are valued at fair value as determined in
good faith by, or under the direction of, the Board of Directors.
 
SECURITY TRANSACTIONS AND RELATED INVESTMENT INCOME: Security transactions are
recorded on the trade date. Dividend income is recorded on the ex-dividend
date, while interest income is recorded on the accrual basis. Original issue
discount is accreted as interest income using a constant yield to maturity.
Discounts on securities purchased are recognized as interest income at the
time the security is sold using a constant yield to maturity. Premiums on
securities purchased are not amortized. Realized and unrealized gains and
losses on investments are recorded on the basis of identified cost.
 
DISTRIBUTIONS: The Fund's Board of Directors has adopted a policy under which
it has declared quarterly dividends of $0.21 per share. Payments to
shareholders under the distribution policy are reflected in the financial
statements in the following order; first from net investment income and,
depending upon the results achieved each year, secondly from net realized
capital gains, thirdly as a distribution in excess of net investment income or
capital gains which may become taxable to shareholders in the subsequent year
and, lastly, as a return of capital which is not taxable to shareholders.
 
 Income and capital gain distributions are determined in accordance with in-
come tax regulations which may differ from generally accepted accounting prin-
ciples. These differences are primarily due to differing treatments for losses
deferred due to wash sales and spillover distributions. Permanent book and tax
basis differences relating to shareholder distributions will result in reclas-
sifications to paid in capital and may affect net investment income per share.
 
REPURCHASE AGREEMENT: The Fund may invest in repurchase agreements secured by
U.S. Government Securities. A repurchase agreement arises when the Fund pur-
chases a security and simultaneously agrees to resell it to the seller at an
agreed upon future date. The Fund requires the seller to maintain the value of
the securities, marked to market daily, at not less than the repurchase price.
If the seller defaults on its repurchase obligation, the Fund could suffer de-
lays, collection expenses and losses to the extent that the proceeds from the
sale of the collateral are less than the repurchase price.
 
                                      12
<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Notes to Financial Statements (continued)
[LOGO OF TCW]
- -------------------------------------------------------------------------------
 
NOTE 2--FEDERAL INCOME TAXES:
 
 It is the policy of the Fund to comply with the requirements of the Internal
Revenue Code applicable to regulated investment companies and distribute all
of its net taxable income, including any net realized gains on investments, to
its shareholders. Therefore, no federal income tax provision is required.
 
 During the year ended December 31, 1997, the Fund realized on a tax basis net
realized gains of $19,760,433 on security transactions.
 
 As of December 31, 1997, net unrealized appreciation (depreciation) for fed-
eral income tax purposes is comprised of the following components:
 
<TABLE>
<S>                                                                <C>
Appreciated securities............................................ $ 47,337,137
Depreciated securities............................................   (1,424,190)
                                                                   ------------
Net unrealized appreciation....................................... $ 45,912,947
                                                                   ============
Cost of securities for federal income tax purposes................ $321,122,585
                                                                   ============
</TABLE>
 
NOTE 3--INVESTMENT ADVISORY AND SERVICE FEES:
 
 TCW Funds Management, Inc. is the Investment Adviser of the Fund and also
furnishes the Fund with accounting and other services and office space. As
compensation for the services rendered, facilities provided, and expenses
borne, the Adviser is paid a monthly fee by the Fund computed at the annual
rate of 0.75% of the first $100 million of the Fund's average net assets and
0.50% of the Fund's average net assets in excess of $100 million. In addition,
the Fund reimburses the Adviser for the costs of providing accounting services
to the Fund (up to a maximum of $25,000 per year).
 
NOTE 4--PURCHASES AND SALES OF SECURITIES:
 
 For the year ended December 31, 1997, purchases and sales or maturities of
investment securities (excluding short-term investments) aggregated
$442,842,376 and $423,664,595, respectively. There were no purchases or sales
of U.S. Government securities for the year ended December 31, 1997.
 
NOTE 5--SECURITY LENDING:
 
 During the year ended December 31, 1997, the Fund lent securities to a broker.
The broker provided collateral, which must be maintained at not less than
100% of the value of the loaned securities, to secure the obligation. At 
December 31, 1997, the cash received from the borrowing broker was invested in
overnight repurchase agreements issued by the borrowing broker which, in turn,
were collateralized by U.S. Treasury securities valued at $5,088,655, or 102%,
of the value of the loaned securities.
 
NOTE 6--DIRECTORS' AND LEGAL FEES:
 
 Directors who are not affiliated with the Investment Adviser received, as a
group, aggregate fees and expenses of $75,000 from the Fund for the period
ended December 31, 1997. Legal fees totaled $5,840 of which $1,703 were paid
to O'Melveny & Myers, of which an individual who is of counsel, serves as a
director of the Fund. Certain officers and/or directors of the Fund are also
officers and/or directors of the Investment Adviser.
 
NOTE 7--REPORT OF ANNUAL MEETING OF SHAREHOLDERS:
 
 The Annual Meeting of Shareholders of the Fund was held on July 16, 1997. At
the meeting, the following matters were submitted to a shareholder vote and
approved by a vote of a majority of the Fund's outstanding voting securities:
(i) the election of Ernest O. Ellison, John C. Argue, Norman Barker, Jr.,
Richard W. Call, Coleman W. Morton, Charles A. Parker, Lawrence J. Sheehan and
Robert G. Sims as Directors to serve until the next annual meeting of the
Fund's shareholders and until their successors are elected and qualify (each
Director received 31,212,605 affirmative votes; votes opposed 319,388 and
votes withheld 337,401); (ii) Renewal of the Investment Advisory and Management
Agreement for another annual period (votes for: 30,947,323; votes against
383,620 and abstentions 538,451); and (iii) the ratification of the
 
                                      13
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Notes to Financial Statements (continued)
[LOGO OF TCW]
- --------------------------------------------------------------------------------
selection of Deloitte & Touche LLP as independent auditors of the Fund for the
fiscal year ending December 31, 1997 (votes for: 31,262,618; votes against
185,364 and abstentions 421,412). 38,437,491 shares were outstanding on the
record date for this meeting and 31,869,394 shares entitled to vote were pres-
ent in person or by proxy at the meeting.
 
NOTE 8--RESTRICTED SECURITIES:
 
 The following restricted securities held by the Fund at December 31, 1997 were
valued both at the date of acquisition and December 31, 1997, in accordance
with the Security Valuation policy of the Fund described in Note 1. The
restricted securities were purchased in private placement transactions without
registration under the Securities Act of 1933. Such securities generally may be
sold only in a privately negotiated transaction with a limited number of
purchasers, in a public offering registered under the Securities Act of 1933
(the "1933 Act") or in accordance with Rule 144A under the 1933 Act. The Fund
may classify a Rule 144A security as liquid if it can be reasonably expected
that the Fund would be able to dispose of the security within seven days in the
ordinary course of business at approximately its carrying value. Rule 144A
securities for which such a determination is not made and other restricted
securities are deemed illiquid and are subject to an aggregate limitation of no
more than 15% of the Fund's investment portfolio. The Fund will bear any costs
incurred in connection with the disposition of restricted securities. The total
value of restricted securities at December 31, 1997 is $163,225,110, which
represents 46% of net assets.
 
                                       14
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Notes to Financial Statements (continued)
     December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------
 
NOTE 8--RESTRICTED SECURITIES (CONTINUED)
 
<TABLE>
<CAPTION>
  Number of
  Shares or
  Principal                                                 Date of
   Amount                                                 Acquisition    Cost
  ---------                                               ----------- ----------
 <C>         <S>                                          <C>         <C>
 $ 1,500,000 Activision, Inc., 6.75%, due 01/01/05.....    12/16/97   $1,500,000
 $ 3,000,000 Adaptec, Inc., 4.75%, due 02/04/04........    01/28/97    3,006,250
 $ 1,920,000 Alternative Living Services, Inc., 7%, due
              06/01/04.................................    05/14/97    1,920,000
      69,200 Apple South, Inc., $3.50 Convertible
              Preferred................................    03/06/97    3,541,000
 $ 9,595,000 Athena
              Neurosciences, Inc., Exchangeable Elan
              Corp. PLC (Ireland), 4.75%, due 11/15/04.    11/05/97    9,595,000
 $ 3,720,000 Atria Communities, Inc., 5%, due
              10/15/02.................................    10/10/97    3,720,000
 $12,250,000 Costo Companies, Inc., 0%, due
              08/19/17.................................    08/14/97    6,198,499
 $ 8,845,000 CUC International, Inc., 3%, due 02/15/02.    02/05/97    8,850,874
      84,100 Evergreen Media Corp., $3.00 Convertible
              Preferred................................    06/11/97    4,298,750
      79,300 EVI, Inc., $2.50 Convertible
              Preferred................................    10/29/97    3,925,875
      52,500 Golden Books Family Entertainment, Inc.,
              $4.375 Convertible Preferred.............    08/14/96    2,656,238
</TABLE>
 
 
 
<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal                                                 Date of
   Amount                                                Acquisition    Cost
 ---------                                               ----------- ----------
 <C>        <S>                                          <C>         <C>
 $2,345,000 Halter Marine Group, Inc.,4.5%, due
             09/15/04..................................   09/10/97   $2,345,000
     63,500 Host Marriott Financial Trust, $3.375
             Convertible Preferred.....................   11/25/96    3,248,625
 $3,030,000 Metsa-Serla OYJ, (Finland), 4.375%, due
             10/15/02..................................   10/09/97    3,041,336
 $3,910,000 OccuSystems, Inc., 6%, due 12/15/01........   12/19/96    3,899,332
 $6,380,000 Omnicare, Inc., 5%, due 12/01/07...........   12/04/97    6,380,000
 $4,955,000 Omnicom Group, Inc., 4.25%, due 01/03/07...   08/18/96    5,004,075
 $3,150,000 Personnel Group of America, Inc., 5.75%,
             due 07/01/04..............................   06/17/97    3,164,875
 $4,790,000 Premiere Technologies, Inc., 5.75%, due
             07/01/04..................................   06/25/97    4,797,700
 $2,880,000 Quintiles Transnational Corp., 4.25%, due
             05/31/00..................................   04/23/96    2,855,555
 $6,250,000 Rite Aid Corp., 5.25%, due 09/15/02........   09/04/97    6,250,000
 $6,585,000 Safeguard Scientifics, Inc.,6%, due
             02/01/06..................................   01/06/97    6,340,594
 $5,465,000 Sandoz Capital BVI, Ltd., (Switzerland),
             2%, due 10/06/02..........................   09/28/95    5,880,539
 $3,295,000 SmarTalk Teleservices, Inc., 5.75%, due
             09/15/04..................................   09/12/97    3,295,000
</TABLE>
 
                                       15
<PAGE>
 
- --------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Notes to Financial Statements (continued)
     December 31, 1997
[LOGO OF TCW]
- --------------------------------------------------------------------------------
NOTE 8--RESTRICTED SECURITIES (CONTINUED)
 
<TABLE>
<CAPTION>
 Number of
 Shares or
 Principal                                                  Date of
   Amount                                                 Acquisition    Cost
 ---------                                                ----------- ----------
 <C>        <S>                                           <C>         <C>
 $7,085,000 Staples, Inc., 4.5%, due 10/01/00..........    09/12/95   $7,332,303
 $2,815,000 Sunrise Assisted Living, Inc., 5.5%, due
             06/15/02..................................    06/03/97    2,828,181
 $1,630,000 Tel-Save Holdings, Inc., 4.5%, due
             09/15/02..................................    09/30/97    1,678,615
 $8,600,000 Tel-Save Holdings, Inc., 5%, due 12/15/04 .    12/05/97    8,600,000
 $8,050,000 Thermo Electron Corp., 4.25%, due 01/01/03.    11/28/95    8,607,361
 $3,965,000 Tower Automotive, Inc., 5%, due 08/01/04...    07/24/97    3,965,000
     15,000 Vanstar Corp., $3.375 Convertible
             Preferred.................................    09/27/96      639,372
 $3,575,000 Wind River Systems,Inc., 5%, due 08/01/02..    07/23/97    3,575,000
</TABLE>
 
 
NOTE 9--COMMON STOCK SUBSCRIPTION RIGHTS:
 
 Non-transferable rights to subscribe to shares of the Fund's common stock were
issued to shareholders of record on March 21, 1997. The rights entitled the
shareholders to acquire one share of newly issued common stock for each five
rights held. At the termination of the subscription period on April 23, 1997,
6,396,283 shares of common stock were subscribed at a price of $8.09 per share
as of April 23, 1997. Proceeds from the subscriptions totaled $51,583,087, net
of issuance costs.

NOTE 10 -- SUBSEQUENT EVENTS (UNAUDITED):

 On February 17, 1998, the Board of Directors authorized the filing of a 
Registration Statement to effect an offering of 7,726,194 shares of the Fund.  
Such Registration Statement was filed with the U.S. Securities and Exchange 
Commission on March 10, 1998.
 
                                       16
<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Financial Highlights
[LOGO OF TCW]
- -------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                            Year Ended December 31,
                           ----------------------------------------------------------------------------------------------------
                             1997      1996      1995      1994       1993      1992      1991      1990       1989      1988
                           --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
 <S>                       <C>       <C>       <C>       <C>        <C>       <C>       <C>       <C>        <C>       <C>
 Net Asset Value Per
  Share, Beginning of
  Year...................  $   8.51  $   8.36  $   7.47  $   8.79   $   8.36  $   8.09  $   6.85  $   8.36   $   7.99  $   7.76
                           --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
 Income from Operations:
 Net Investment Income...      0.35      0.36      0.37      0.38       0.40      0.41      0.43      0.46       0.50      0.55
 Impact to Capital for
  Shares Issued..........     (0.01)       --        --        --      (0.01)    (0.01)       --        --         --        --
 Net Realized and
  Unrealized Gains
  (Losses) on 
  Securities.............      1.23      0.77      1.36     (0.86)      1.25      0.71      1.65     (1.13)      0.71      0.44
                           --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
    Total from Investment
     Operations..........      1.57      1.13      1.73     (0.48)      1.64      1.11      2.08     (0.67)      1.21      0.99
 Less Distributions:
 Distributions from
  Net Investment Income..     (0.35)    (0.36)    (0.37)    (0.38)     (0.40)    (0.41)    (0.43)    (0.46)     (0.50)    (0.55)
 Distributions from
  Net Realized Gains.....     (0.52)    (0.62)    (0.33)    (0.30)     (0.81)    (0.07)       --        --      (0.06)       --
 Distributions in Excess
  of Net Realized Gains..        --        --     (0.14)    (0.16)        --        --        --        --         --        --
 Return of Capital ......        --        --        --        --         --     (0.36)    (0.41)    (0.38)     (0.28)    (0.21)
                           --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
    Total Distributions..     (0.87)    (0.98)    (0.84)    (0.84)     (1.21)    (0.84)    (0.84)    (0.84)     (0.84)    (0.76)
                           --------  --------  --------  --------   --------  --------  --------  --------   --------  --------
 Net Asset Value Per
  Share, End of Year.....  $   9.21  $   8.51  $   8.36  $   7.47   $   8.79  $   8.36  $   8.09  $   6.85   $   8.36  $   7.99
                           ========  ========  ========  ========   ========  ========  ========  ========   ========  ========
 Total Investment
  Return (1).............     12.98%    11.75%     33.6%    (7.43)%    13.77%    15.90%    41.38%    (3.78)%    20.23%    24.79%
 Net Asset Value Total
  Return (2).............     19.10%    13.94%     24.0%    (5.70)%    16.12%    13.35%    31.20%    (8.25)%    15.97%    13.24%
 RATIOS/SUPPLEMENTAL
  DATA:
 Net Assets, End of Year
  (in thousands).........  $355,061  $271,267  $264,608  $234,686   $273,230  $215,208  $172,331  $144,593   $175,732  $167,797
 Ratio of Expenses to
  Average Net Assets.....      0.74%     0.77%     0.81%     0.79%      0.80%     0.88%     0.94%     0.94%      0.95%     0.94%
 Ratio of Net Investment
  Income to Average Net
  Assets.................      3.95%     4.12%     4.60%     4.66%      4.48%     5.04%     5.68%     5.93%      5.90%     6.66%
 Portfolio Turnover Rate.    132.99%   125.72%   108.98%   110.04%    173.79%   139.39%   114.13%    99.53%     84.17%    70.62%
 Average Commission Rate
  Paid by the Fund (3)...  $   0.06  $   0.06       N/A       N/A        N/A       N/A       N/A       N/A        N/A       N/A
</TABLE>
 
(1) Based on market value per share, adjusted for reinvestment of 
    distributions.
(2) Based on net asset value per share, adjusted for reinvestment of 
    distributions.
(3) For fiscal years beginning on or after September 1, 1995, a fund is 
    required to disclose its average commission rate per share for security
    trades on which commissions are charged. This amount may vary from period
    to period and fund to fund depending on the mix of trades executed in 
    various markets where trading practices and commission rate structures may
    differ.
 
See accompanying Notes to Financial Statements.
 
                                      17
<PAGE>
 
- -------------------------------------------------------------------------------
     TCW CONVERTIBLE SECURITIES FUND, INC.
     Independent Auditors' Report
[LOGO OF TCW]
- -------------------------------------------------------------------------------
TO THE BOARD OF DIRECTORS AND SHAREHOLDERS OF TCW CONVERTIBLE SECURITIES FUND,
INC.:
 
  We have audited the accompanying statement of assets and liabilities of TCW
Convertible Securities Fund, Inc., (the "Fund") including the schedule of
investments, as of December 31, 1997, and the related statement of operations
for the year then ended, the statement of changes in net assets for the two
years in the period then ended, and the financial highlights for each of the
ten years in the period then ended. These financial statements and financial
highlights are the responsibility of the Fund's management. Our responsibility
is to express an opinion on these financial statements and financial
highlights based upon our audits.
 
  We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to
obtain reasonable assurance about whether the financial statements and
financial highlights are free of material misstatement. An audit includes
examining, on a test basis, evidence supporting the amounts and disclosures in
the financial statements. Our procedures included confirmation of securities
owned as of December 31, 1997 by correspondence with the custodian. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe our audits provide a reasonable basis for
our opinion.
 
  In our opinion, the financial statements and financial highlights referred
to above present fairly, in all material respects, the financial position of
the Fund as of December 31, 1997 and the results of its operations, the
changes in its net assets, and the financial highlights for the respective
stated periods in conformity with generally accepted accounting principles.
 
                                     /s/ Deloitte & Touche LLP
 
February 10, 1998
Los Angeles, California
 
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