<PAGE>   1

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

                                    FORM 10-Q



                Quarterly Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934

                              LACLEDE STEEL COMPANY



For the Quarter Ended  DECEMBER 31, 1999 Commission File Number 0-3855
                      ------------------                        ------

          DELAWARE                                        43-0368310
--------------------------------------           -------------------------------
(State or other jurisdiction of                        (I.R.S. Employer
incorporation or organization)                      Identification Number)


       440 NORTH 4TH STREET
            SUITE 300
       ST. LOUIS, MISSOURI                                   63102
--------------------------------------           -------------------------------
(Address of principal executive office)                    (Zip Code)

                                 (314) 425-1400
                          -----------------------------
                         (Registrant's Telephone Number)


Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months and (2) has been subject to such filing requirements for
the past 90 days:

Yes  [X]

No   [ ]


Indicate the number of shares outstanding of each of the issuer's classes of
common stock as of the latest practicable date:

     At December 31, 1999, the number of shares outstanding of the registrant's
     only class of common stock was 4,056,140 shares with a par value of $.01.

<PAGE>   2

                         PART 1 - FINANCIAL INFORMATION

Item 1:   Financial Statements

                              LACLEDE STEEL COMPANY
                                AND SUBSIDIARIES
                             (DEBTORS-IN-POSSESSION)
                      CONSOLIDATED STATEMENTS OF OPERATIONS
                                   (Unaudited)
                      (In Thousands Except Per Share Data)


<TABLE>
<CAPTION>
                                                      Three Months Ended
                                                         December 31,
                                                      ------------------
                                                       1999        1998
                                                      -----        -----
<S>                                                  <C>         <C>
Net sales                                            $ 59,409    $ 68,108
                                                     --------    --------
Costs and expenses:
     Cost of products sold                             56,553      62,953
     Selling, general and administrative expenses       2,930       3,217
     Depreciation                                       1,505       1,643
     Interest expense (Contractual interest -           1,569       2,452
         $2,113 in 1999 and $2,506 in 1998)
     Other charges (credits)                             (373)      9,907
                                                     --------    --------
          Total                                        62,184      80,172
                                                     --------    --------

Reorganization costs                                    1,466         910
                                                     --------    --------
Loss before income taxes                               (4,241)    (12,974)

Credit for income taxes                                   (25)        (18)
                                                     --------    --------
Net loss                                               (4,216)    (12,956)

Preferred stock dividend requirement                       --         (94)
    (Contractual dividends - $94 in 1999)            --------    --------


Net loss available to common stockholders            $ (4,216)   $(13,050)
                                                     ========    ========
Basic and diluted net loss per common share          $  (1.04)   $  (3.22)
                                                     ========    ========
</TABLE>

See notes to the Consolidated Financial Statements

                                      -2-
<PAGE>   3


                              LACLEDE STEEL COMPANY
                                AND SUBSIDIARIES
                             (DEBTORS-IN-POSSESSION)
                           CONSOLIDATED BALANCE SHEETS
                                   (Unaudited)
                                 (In Thousands)

<TABLE>
<CAPTION>

                                         December 31, September 30,
                                             1999         1999
                                         -----------  ------------
<S>                                        <C>        <C>
ASSETS

CURRENT ASSETS

    Cash                                   $    205   $    205
    Accounts receivable, less allowances     33,211     37,956
    Prepaid expenses                          2,699      4,130
    Inventories:
        Finished                             34,038     34,298
        Semi-finished                         8,493      7,082
        Raw materials                         7,258      4,627
        Supplies                             10,336     11,593
                                           --------   --------
            Total inventories                60,125     57,600
                                           --------   --------
            Total current assets             96,240     99,891
                                           --------   --------

NON-CURRENT ASSETS                            6,644      6,353
                                           --------   --------

PLANT AND EQUIPMENT, At cost                217,635    218,327
    Less - accumulated depreciation         134,563    134,500
                                           --------   --------
            Net plant and equipment          83,072     83,827
                                           --------   --------


TOTAL                                      $185,956   $190,071
                                           ========   ========
</TABLE>

See notes to the Consolidated Financial Statements


                                       -3-
<PAGE>   4
                             LACLEDE STEEL COMPANY
                                AND SUBSIDIARIES
                            (DEBTORS-IN-POSSESSION)
                          CONSOLIDATED BALANCE SHEETS
                                  (Unaudited)
                      (In Thousands Except Per Share Data)

<TABLE>
<CAPTION>
                                                          December 31,  September 30,
                                                              1999         1999
                                                          -----------   ------------
<S>                                                        <C>          <C>
LIABILITIES AND STOCKHOLDERS' DEFICIT

LIABILITIES NOT SUBJECT TO COMPROMISE:
CURRENT LIABILITIES
    Accounts payable and accrued expenses                  $  14,100    $  10,421
    Accrued compensation                                       3,560        4,162
    Current portion of long-term debt                         57,127       61,877
    Other                                                      3,201        2,955
                                                           ---------    ---------
            Total current liabilities                         77,988       79,415
                                                           ---------    ---------

NON-CURRENT LIABILITIES                                        6,453        6,392
                                                           ---------    ---------
LIABILITIES SUBJECT TO COMPROMISE:
    Accounts payable & accrued expenses                       50,323       50,294
    Accrued postretirement medical benefits                   70,259       70,626
    Accrued costs of pension plans                            42,241       40,341
    Long-term debt                                            25,990       25,990
    Other                                                      2,904        2,999
                                                           ---------    ---------
           Total liabilities subject to compromise           191,717      190,250
                                                           ---------    ---------

STOCKHOLDERS' DEFICIT:
    Preferred stock, no par value, authorized 2,000,000
      shares; issued and outstanding 416,667 shares               83           83
    Common stock, $0.01 par value, authorized 25,000,000
      shares; issued and outstanding 4,056,140 shares             41           41
    Capital in excess of par value                            59,420       59,420
    Accumulated deficit                                     (124,688)    (120,472)
    Minimum pension liability adjustment                     (25,058)     (25,058)
                                                           ---------    ---------
            Total stockholders' deficit                      (90,202)     (85,986)
                                                           ---------    ---------
TOTAL                                                      $ 185,956    $ 190,071
                                                           =========    =========
</TABLE>

See notes to the Consolidated Financial Statements

                                       -4-
<PAGE>   5

                            LACLEDE STEEL COMPANY
                              AND SUBSIDIARIES
                           (DEBTORS-IN-POSSESSION)
                    CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (Unaudited)
                               (In Thousands)
<TABLE>
<CAPTION>
                                                                       Three Months Ended
                                                                          December 31,
                                                                     --------------------
                                                                        1999       1998
                                                                     ---------   --------
<S>                                                                  <C>         <C>
Cash flows from operating activities:
      Net loss                                                       $ (4,216)   $(12,956)
      Adjustments to reconcile net loss to
         net cash provided by operating activities:
           Depreciation                                                 1,505       1,643
           Reorganization items                                         1,466         910
           Other charges (credits)                                       (373)     11,738
      Changes in assets and liabilities that provided (used) cash:
            Accounts receivable                                         4,745       3,447
            Inventories                                                (2,525)     11,084
            Accounts payable and accrued expenses                       2,214         564
            Accrued pension cost                                        1,919       2,041
            Pension cash funding                                           --        (604)
            Accrued postretirement medical benefits                      (367)       (798)
            Other assets and liabilities                                1,334       3,242
                                                                     ---------   --------
       Net cash provided by operating activities
         before Reorganization Items                                    5,702      20,311

Operating Cash Flow from Reorganization Items -
     Bankruptcy related professional fees paid                           (377)       (510)
                                                                     ---------   --------
       Net cash provided by operating activities                        5,325      19,801
                                                                     ---------   --------
Cash flows provided by investing activities:
       Capital expenditures                                            (1,196)       (232)
       Proceeds from sale of assets                                       621         789
                                                                     ---------   --------
       Net cash provided by (used in) investing activities               (575)        557
                                                                     ---------   --------
Cash flows from financing activities:
       Net repayments under bank facility                              (4,750)    (20,171)
       Payment of financing costs                                          --        (100)
                                                                     ---------   --------
       Net cash used in financing activities                           (4,750)    (20,271)
                                                                     ---------   --------
Cash:
       Net increase during the period                                      --          87
       At beginning of year                                               205         192
                                                                     ---------   --------
       At end of period                                              $    205    $    279
                                                                     =========   ========
</TABLE>

See notes to the Consolidated Financial Statements

                                       -5-
<PAGE>   6

LACLEDE STEEL COMPANY AND SUBSIDIARIES
(DEBTORS-IN-POSSESSION)
NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS FOR THE
THREE MONTHS ENDED DECEMBER 31, 1999 AND 1998
--------------------------------------------------------------------------------


1.   GENERAL

     The accompanying unaudited consolidated financial statements include the
     accounts of Laclede Steel Company and its subsidiaries (the "Company"). All
     intercompany accounts and transactions have been eliminated. The
     consolidated financial statements reflect all adjustments (such adjustments
     are of a normal recurring nature unless otherwise disclosed in these
     interim financial statements) which are in the opinion of management
     necessary for a fair statement of the results for the interim periods.

     The results of operations for the three months ended December 31, 1999 are
     not necessarily indicative of the results to be expected for the full
     fiscal year ending September 30, 2000. The financial results for the fiscal
     year ending September 30, 2000 are subject to annual audit. The Quarterly
     Report on Form 10-Q should be read in conjunction with the Company's Annual
     Report on Form 10-K for the fiscal year ended September 30, 1999.

2.   BANKRUPTCY PROCEEDINGS

     On November 30, 1998, as a result of deterioration in steel demand and
     selling prices, recurring losses, capital deficiency and funding
     requirements of its defined benefit pension plans, Laclede Steel Company
     and subsidiaries filed voluntary petitions for reorganization under Chapter
     11 of the United States Bankruptcy Code (the "Code"). The Company is
     operating as debtors-in-possession under the Code, which protects it from
     its creditors pending reorganization under the jurisdiction of the
     Bankruptcy Court. As a debtors-in-possession, the Company is authorized to
     operate its business but may not engage in transactions outside the
     ordinary course of business without approval of the Bankruptcy Court. A
     statutory creditors committee has been appointed in this Chapter 11 case.
     As part of the Chapter 11 reorganization process, the Company has attempted
     to notify all known or potential creditors of the Chapter 11 filing for the
     purpose of identifying all prepetition claims against the Company.

     In the Chapter 11 case, substantially all of the liabilities as of the
     filing date are subject to settlement under a plan of reorganization.
     Generally, actions to enforce or otherwise effect repayment of all
     prepetition liabilities as well as all pending litigation against the
     Company are stayed while the Company continues its business operations as
     debtors-in-possession. Schedules have been filed by the Company with the
     Bankruptcy Court setting forth the assets and liabilities of the debtors as
     of the filing date as reflected in the Company's accounting records.
     Differences between amounts reflected in such schedules and claims filed by
     creditors will be investigated and amicably resolved or adjudicated before
     the Bankruptcy Court. The ultimate amount and settlement terms for such
     liabilities are subject to a plan of reorganization, and accordingly, are
     not presently determinable.

                                      -6-
<PAGE>   7

     Under the Bankruptcy Code, the Company may elect to assume or reject real
     estate leases, employment contracts, personal property leases, service
     contracts and other executory pre-petition contracts, subject to Bankruptcy
     Court review. The Company cannot presently determine or reasonably estimate
     the ultimate liability that may result from rejecting leases or from filing
     of claims for any rejected contracts, and no provisions have been made for
     these items.

     The Company expects the Pension Benefit Guaranty Corporation ("PBGC") to
     assume its obligations under its defined benefit pension plans for its
     salaried and hourly employees, which would result in the PBGC becoming one
     of its largest unsecured creditors. The termination of these plans will be
     an integral part of the plan of reorganization. As of November 30, 1998,
     the Company had a significant unfunded obligation related to these pension
     plans. The Company has made no contributions to the pension plans since
     filing Chapter 11 on the basis that the Company believes prepetition
     pension obligations can only be paid with Bankruptcy Court approval or as
     part of a plan of reorganization. The disposition of the Company's
     postretirement medical obligations has not as yet been determined and these
     obligations have been included as liabilities subject to compromise.
     Pursuant to the provisions of the Bankruptcy Code, the Company continues to
     incur the cost of the postretirement medical plans. The Bankruptcy Court
     has approved the payment of certain prepetition liabilities such as
     employee wages and benefits. The Bankruptcy Court has also allowed for the
     retention of legal and financial professionals. These professional fees
     represent the majority of reorganization items recorded in the consolidated
     statements of operations and, to the extent unpaid, are liabilities not
     subject to compromise.

     At the time of filing Chapter 11, the Company's receivables, inventory, and
     certain plant and equipment were pledged as collateral under a Loan and
     Security Agreement with a bank group. Subsequent to the filing, with the
     approval of the Bankruptcy Court, the Company entered into an amended Loan
     And Security Agreement with BankAmerica (the "DIP Facility"), which
     provides for borrowing up to $85 million. The DIP Facility provides for
     revolving credit based on eligible receivables and inventory similar to the
     previous Loan and Security Agreement. In addition, virtually all assets of
     the Company have been granted as collateral to the Loan and Security
     Agreement, except for certain assets of Laclede Chain Manufacturing
     Company. As of December 31, 1999 the Company had unused availability under
     the DIP Facility of approximately $7.2 million.

     The Company's consolidated financial statements have been prepared in
     accordance with the American Institute of Certified Public Accountants
     (AICPA) Statement of Position 90-7, "Financial Reporting by Entities in
     Reorganization Under the Bankruptcy Code". In addition the consolidated
     financial statements have been prepared using accounting principles
     applicable to a going concern, which contemplates the realization of assets
     and the payment of liabilities in the ordinary course of business. As a
     result of the Chapter 11 filing, such realization of assets and liquidation
     of liabilities is subject to uncertainty. The financial statements include
     reclassifications made to reflect the liabilities which have been deferred
     under the Chapter 11 proceedings as "Liabilities Subject to Compromise".
     Certain accounting and business practices have been adopted that are
     applicable to companies that are operating under Chapter 11.

                                      -7-
<PAGE>   8


     The Company intends to present a plan of reorganization to the Bankruptcy
     Court to reorganize the Company's businesses and to restructure the
     Company's obligations. Under the provisions of the Bankruptcy Code, the
     Company had the exclusive right to file such plan at any time during the
     120-day period following November 30, 1998. The Company has sought an
     extension which if approved by the Bankruptcy Court will extend the
     exclusive right of the Company to file a plan of reorganization until March
     31, 2000. While management believes the Company has made adequate provision
     for the liabilities to be incurred in connection with Chapter 11 claims,
     there can be no assurance as to the amount of the ultimate liabilities, the
     impact of such liabilities on a plan of reorganization or how such
     liabilities will be treated in a plan of reorganization. The Company's
     continued existence is also dependent on its ability to achieve future
     profitable operations, the assumption of the Company's obligations under
     its defined benefit plans by the PBGC, and continued compliance with all
     debt covenants under the DIP Facility.

3.   OTHER CHARGES (CREDITS)

     Unusual charges (credits) in the quarter included the following (thousands
     of dollars):

<TABLE>
<CAPTION>
                                                         December 31,
                                                  --------------------------
                                                   1999               1998
                                                  -------           ---------
<S>                                               <C>               <C>
     Sale of Madison, IL Facility                 $ (373)           $      -
     Curtailment Loss on Pensions                      -              11,738
     Lawsuit Settlement - Electrodes                   -              (1,831)
                                                  ------            --------
       Total                                      $ (373)           $  9,907
                                                  ======            ========
</TABLE>

     In December 1999, the Company sold property in Madison, Illinois for $621
     thousand which resulted in a gain of $373 thousand.

     Due to the probability that the hourly and salaried pension plans will be
     terminated by the PBGC, the Company recorded an $11.7 million curtailment
     loss in the quarter ended December 31, 1998. The Company recorded income of
     $1.8 million in the December 31, 1998 quarter from settlements in
     connection with class action lawsuits involving electrode manufacturers.

4.   PER SHARE DATA

     Per share amounts have been calculated based on weighted average shares
     outstanding of 4,056,140. Prior to the bankruptcy filing, net loss per
     share was computed by dividing the net loss after deducting preferred
     dividend requirements by the weighted average shares of common stock
     outstanding.


                                   * * * * * *



                                       -8-
<PAGE>   9


ITEM 2.

                              LACLEDE STEEL COMPANY
                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS
--------------------------------------------------------------------------------


The discussion and analysis below should be read in conjunction with the
unaudited consolidated financial statements of the Company and the notes to the
unaudited consolidated financial statements included elsewhere in the Form 10-Q.

As described in Note 2 to the unaudited consolidated financial statements, the
Company filed voluntary petitions for reorganization under Chapter 11 of the
United States Bankruptcy Code on November 30, 1998. For more information see
Note 2 as well as the Company's Annual Report on Form 10-K for the fiscal year
ended September 30, 1999.


Liquidity and Capital Resources

During the three months ended December 31, 1999, operating activities provided
$5.7 million in cash reflecting decreases in accounts receivable of $4.7
million, increases in accounts payable and accrued expenses of $2.2 million, and
increases in accrued pension cost of $1.9 million.

Cash flow used in financing activities consisted of a $4.8 million net reduction
in revolving credit borrowings under the Company's bank facility.

Under the terms of the Bankruptcy case, liabilities in the amount of $191.7
million are subject to compromise under a plan of reorganization. Pursuant to
the provisions of the Bankruptcy Code and during the pendency of the Bankruptcy
proceeding, the Company does not intend to make contributions to its pension
plans. Generally, actions to enforce or otherwise effect repayment of all
prepetition liabilities as well as all pending litigation against the Company
are stayed while the Company continues its business operations as
debtors-in-possession. The ultimate amount and settlement terms for such
liabilities are subject to a plan of reorganization, and accordingly, are not
presently determinable.

The Company's projections indicate that availability under the
debtor-in-possession facility should be adequate to finance its operations until
exit from bankruptcy, assuming no material reduction in the company's sales or
increase in overall costs of operations.  In addition, the facility should be
adequate to finance all planned capital expenditures, which, under terms
of the DIP Facility, cannot exceed $3.9 million for the six months ending June
30, 2000.

Although the Company believes that anticipated cash flows from future operations
and borrowings under the DIP Facility should provide sufficient liquidity for
the Company to meet its debt service requirements, satisfy covenants under the
DIP Facility and fund ongoing operations, there can be no assurance these or
other possible sources will be adequate.


                                      -9-
<PAGE>   10


Results of Operations

     Net Sales:

Net sales decreased by $8.7 million or 12.8% in the quarter ended December 31,
1999 compared to the same period of the prior year. Steel shipments remained
relatively level for the 1999 and 1998 fiscal quarters ended December 31;
however, average sales prices for all steel products decreased 7.1% in the
quarter ended December 31, 1999. Chain product sales sustained a 34.8% decrease
compared to the same quarter of the prior year due to reduced sales of anti-skid
devices for trucks and automobiles, which were adversely affected by a mild
winter.

The cost of products sold decreased $6.4 million or 10.2% in the quarter ended
December 31, 1999 compared to the same period of the prior year. This reflects
slightly lower scrap cost and lower chain product sales discussed above.

     Operating Expenses:

Selling, general and administrative expenses decreased from $3.2 million for the
quarter ended December 31, 1998 to $2.9 million for the quarter ended December
31, 1999, primarily as a result of reductions in the salaried workforce.

The decrease of $.9 million in interest expense is reflective of a decreased
average outstanding balance as well as the discontinuance on November 30, 1998
of recording interest expense on unsecured and undersecured prepetition debt
pursuant to SOP 90-7. Contractual interest was $2.1 million and $2.5 million for
the quarters ended December 31, 1999 and 1998, respectively.

As discussed in Note 3, the Company recorded other credits of $373 thousand in
the three months ended December 31, 1999 relating to the sale of a facility, and
received proceeds from the settlement of a lawsuit of $1.8 million in the
quarter ended December 31, 1998. Due to the probability that the hourly and
salaried pension plans will be terminated by the PBGC, the Company recorded an
$11.7 million curtailment loss in the quarter ended December 31, 1998. (See
Notes to the Unaudited Consolidated Financial Statements.)

     Year 2000:

Y2K Subsequent Events - On December 31, 1999 the Company completed a systematic
shut down of its Alton Plant Operations and successfully completed a systematic
start-up on January 1, 2000 without any material effects to the Company or its
operations. As of the filing date of this form 10-Q for December 31, 1999, no
significant customer, vendor or operational issues relating to year 2000
readiness have arisen that would have a material effect on the Company, its
operations, financial position, or cash flow in future periods.

Based on the Company's current assessment, the costs of addressing potential
problems are not currently expected to have a material adverse impact on the
Company's financial position, results of operations or cash flows in future
periods. If the Company or its customers or vendors identify year 2000 issues in
the future, however, and are unable to resolve such issues in a timely manner,
it could result in a material financial risk. Accordingly, the Company plans to
devote the necessary resources to resolve any remaining significant year 2000
issues in a timely manner.

                                      -10-

<PAGE>   11

CAUTIONARY STATEMENT FOR PURPOSES OF THE "SAFE HARBOR" PROVISIONS OF THE PRIVATE
SECURITIES LITIGATION REFORM ACT OF 1995

The foregoing Management's Discussion and Analysis and other portions of this
report on Form 10-Q and previous reports, contain various "forward-looking
statements" within the meaning of Section 27A of the Securities Act of 1933, as
amended, and Sections 21E of the Securities Exchange Act of 1934, as amended,
which represent the Company's expectations or beliefs concerning future events,
including the following: statements regarding the overall demand for steel;
statements regarding the ability to maintain sales prices; statements regarding
productivity improvement programs; statements regarding the Company's
profitability; statements regarding future borrowing capacity; statements
regarding Year 2000 compliance and statements regarding future pension funding
requirements. In addition, statements containing expressions such as "believes,"
"anticipates" or "expects" used in the Company's periodic reports on Forms 10-K,
10-Q and 8-K filed with the SEC are intended to identify forward-looking
statements.

Forward-looking statements by the Company and its management are based on
estimates, projections, beliefs and assumptions of management and are not
guarantees of future performance. The Company disclaims any obligation to update
or revise any forward-looking statement based on the occurrence of future
events, the receipt of new information, or otherwise. The Company cautions that
these and similar statements included in this report and in previously filed
periodic reports including reports filed on Forms 10-K, 10-Q and 8-K and further
qualified by important factors that could cause actual results to differ
materially from those in the forward-looking statement, including, without
limitation, the following: decline in sales prices for steel products; increases
in the cost of steel scrap; failure to obtain significant benefits from the
Company's cost reduction and productivity improvement programs; increased
domestic or foreign steel competition; decreases in the market value of the
Company's qualified pension plan assets; increases in financing costs, labor
relations, and adverse developments arising from the Chapter 11 proceedings and
adverse developments in the timing or results from the Company's current
business plan.


                                      -11-
<PAGE>   12


                           PART II - OTHER INFORMATION

     ITEM 4.   SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

                         None

     ITEM 6.   EXHIBITS AND REPORTS ON FORM 8-K.

                    (a)  Exhibits

     (3)(a)    Registrant's Certificate of Incorporation as restated October 28,
               1996. (Incorporated by reference to Exhibit (3) in Registrant's
               Quarterly Report on Form 10-Q for September 30, 1996.)

     (3)(b)    By-laws of Registrant amended October 21, 1998. (Incorporated by
               reference to Exhibit (3)(b) in Registrant's Form 10-K for the
               Transition Period January 1, 1998 to September 30, 1998.)

     (4)(a)    Registrant's Postpetition Loan and Security Agreement dated
               December 1, 1998. (Incorporated by reference to Exhibit (4)(e) in
               Registrant's Form 10-K for the Transition Period January 1, 1998
               to September 30, 1998.)

     (4)(b)    First Amendment to Postpetition Loan and Security Agreement dated
               December 23, 1998. (Incorporated by reference to Exhibit (4)(f)
               in Registrant's Form 10-K for the Transition Period January 1,
               1998 to September 30, 1998.)

     (4)(c)    Second Amendment to Postpetition Loan and Security Agreement
               dated July 1, 1999. (Incorporated by reference to Exhibit (4) (e)
               in Registrant's Quarterly Report on Form 10-Q for the period
               ended June 30, 1999.)

     (4)(d)    Third Amendment to Postpetition Loan and Security Agreement dated
               December 17, 1999. (Incorporated by reference to Exhibit (4) (d)
               in Registrant's Form 10-K for the fiscal year ended September 30,
               1999.)

               (b)  Reports on Form 8-K - None




                                      -12-
<PAGE>   13

                                   SIGNATURES

Pursuant to the requirements of the Securities and Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



                              LACLEDE STEEL COMPANY
--------------------------------------------------------------------------------


                               /s/ Michael H. Lane
                     --------------------------------------
                                 Michael H. Lane
                            Executive Vice President
                             Chief Financial Officer

                           Duly Authorized Officer and
                           Principal Financial Officer










Date: February 11, 2000
     ------------------------