<PAGE>   1
 
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                   FORM 10-Q
 
(MARK ONE)
 
<TABLE>
<S>  <C>
[X]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934 FOR THE QUARTERLY PERIOD
     ENDED MARCH 31, 1999, OR
[ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
     SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD
     FROM ____________ TO ____________
</TABLE>
 
                         COMMISSION FILE NO. 333-43005
 
                           PARK-OHIO INDUSTRIES, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                        <C>
                   OHIO                                    34-6520107
------------------------------------------ ------------------------------------------
     (State or other jurisdiction of                    (I.R.S. Employer
      incorporation or organization)                  Identification No.)
   23000 EUCLID AVENUE, CLEVELAND, OHIO                      44117
------------------------------------------ ------------------------------------------
 (Address of principal executive offices)                  (Zip Code)
</TABLE>
 
        REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: 216/692-7200
 
     PURSUANT TO A CORPORATE REORGANIZATION EFFECTIVE JUNE 15, 1998, PARK-OHIO
INDUSTRIES, INC. BECAME A WHOLLY-OWNED SUBSIDIARY OF PARK-OHIO HOLDINGS CORP.
 
     THE REGISTRANT MEETS THE CONDITIONS SET FORTH IN GENERAL INSTRUCTION
H(1)(a) AND (b) OF FORM 10-Q AND IS THEREFORE FILING THIS FORM IN THE REDUCED
DISCLOSURE FORMAT.
 
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 twelve months
         (or for such shorter period that the registrant was required to file
         such reports):
 
and
 
     (2) Has been subject to such filing requirements for the past 90 days.
        YES [X]     NO [ ]
 
All of the outstanding capital stock of the registrant is held by Park-Ohio
Holdings Corp. as of April 30, 1999, 100 shares of the registrants common stock,
$1 par value, was outstanding.
 
                    The Exhibit Index is located on page 16.
 
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<PAGE>   2
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
                                     INDEX
 
<TABLE>
<S>         <C>
PART I      FINANCIAL INFORMATION
Item 1.     Financial Statements (Unaudited)
            Consolidated balance sheets--March 31, 1999 and December 31,
            1998
            Consolidated statements of income--Three months ended March
            31, 1999 and 1998
            Consolidated statement of shareholder's equity--Three months
            ended March 31, 1999
            Consolidated statements of cash flows--Three months ended
            March 31, 1999 and 1998
            Notes to consolidated financial statements--March 31, 1999
            Independent accountants' review report
Item 2.     Management's Discussion and Analysis of Financial Condition
            and Results of Operations
PART II     OTHER INFORMATION
Item 6.     Exhibits and Reports on Form 8-K
 
SIGNATURE
 
EXHIBIT INDEX
</TABLE>
 
                                        2
<PAGE>   3
 
                                     PART I
 
                             FINANCIAL INFORMATION
 
                                        3
<PAGE>   4
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
<TABLE>
<CAPTION>
                                                              (UNAUDITED)
                                                               MARCH 31      DECEMBER 31
                                                                 1999           1998
                                                              -----------    -----------
                                                                (DOLLARS IN THOUSANDS)
<S>                                                           <C>            <C>
                           ASSETS
Current Assets
  Cash and cash equivalents                                    $  4,482       $  4,320
  Accounts receivable, less allowances for doubtful accounts
     of $3,060 at March 31, 1999 and $2,803 at December 31,
     1998...................................................    101,761         95,718
  Inventories...............................................    168,072        150,052
  Deferred tax assets.......................................      2,232          2,232
  Other current assets......................................      6,614          5,468
                                                               --------       --------
       Total Current Assets.................................    283,161        257,790
Property, Plant and Equipment...............................    198,909        160,625
  Less accumulated depreciation.............................     74,488         70,468
                                                               --------       --------
                                                                124,421         90,157
Other Assets
  Excess purchase price over net assets acquired, net of
     accumulated amortization of $8,919 at March 31, 1999
     and $8,105 at December 31, 1998........................    109,873         99,351
  Deferred taxes............................................      8,900          8,900
  Other.....................................................     38,926         33,356
                                                               --------       --------
                                                               $565,281       $489,554
                                                               ========       ========
            LIABILITIES AND SHAREHOLDER'S EQUITY
Current Liabilities
  Trade accounts payable....................................   $ 62,066       $ 46,755
  Accrued expenses..........................................     54,986         32,076
  Current portion of long-term liabilities..................      2,034          2,372
                                                               --------       --------
       Total Current Liabilities............................    119,086         81,203
Long-Term Liabilities, less current portion
  Long-term debt............................................    270,032        237,483
  Other postretirement benefits.............................     26,152         26,286
  Other.....................................................      4,572          3,740
                                                               --------       --------
                                                                300,756        267,509
Shareholder's Equity
  Common stock, par value $1 a share........................        -0-            -0-
  Additional paid-in capital................................     64,844         64,844
  Retained earnings.........................................     81,928         77,580
  Accumulated other comprehensive earnings (loss)...........     (1,333)        (1,582)
                                                               --------       --------
                                                                145,439        140,842
                                                               --------       --------
                                                               $565,281       $489,554
                                                               ========       ========
</TABLE>
 
Note: The balance sheet at December 31, 1998 has been derived from the audited
      financial statements at that date, but does not include all of the
      information and footnotes required by generally accepted accounting
      principles for complete financial statements.
 
See notes to consolidated financial statements.
 
                                        4
<PAGE>   5
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
                 CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED
                                                                     MARCH 31
                                                              ----------------------
                                                                1999         1998
                                                              ---------    ---------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                           <C>          <C>
Net sales...................................................  $171,403     $136,503
Cost of products sold.......................................   140,436      113,171
                                                              --------     --------
  Gross profit..............................................    30,967       23,332
Selling, general and administrative expenses................    17,952       14,137
                                                              --------     --------
  Operating income..........................................    13,015        9,195
Interest expense............................................     5,378        4,152
                                                              --------     --------
  Income before income taxes................................     7,637        5,043
Income taxes................................................     3,289        2,169
                                                              --------     --------
  Net income................................................  $  4,348     $  2,874
                                                              ========     ========
</TABLE>
 
See notes to consolidated financial statements.
 
                                        5
<PAGE>   6
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
           CONSOLIDATED STATEMENT OF SHAREHOLDER'S EQUITY (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                           ACCUMULATED
                                                                              OTHER
                                                ADDITIONAL                COMPREHENSIVE
                                      COMMON     PAID-IN      RETAINED      EARNINGS
                                      STOCK      CAPITAL      EARNINGS       (LOSS)         TOTAL
                                      ------    ----------    --------    -------------    --------
                                                         (DOLLARS IN THOUSANDS)
<S>                                   <C>       <C>           <C>         <C>              <C>
Balance January 1, 1999.............   $-0-      $64,844      $77,580        $(1,582)      $140,842
Comprehensive income:
  Net income........................                            4,348                         4,348
  Foreign currency translation
     adjustment.....................                                             249            249
                                                                                           --------
     Comprehensive income...........                                                          4,597
                                       ----      -------      -------        -------       --------
Balance March 31, 1999..............   $-0-      $64,844      $81,928        $(1,333)      $145,439
                                       ====      =======      =======        =======       ========
</TABLE>
 
See notes to consolidated financial statements.
 
                                        6
<PAGE>   7
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
               CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED)
 
<TABLE>
<CAPTION>
                                                                THREE MONTHS ENDED
                                                                     MARCH 31
                                                              ----------------------
                                                                1999         1998
                                                              ---------    ---------
                                                              (DOLLARS IN THOUSANDS)
<S>                                                           <C>          <C>
OPERATING ACTIVITIES
  Net income................................................  $  4,348     $  2,874
  Adjustments to reconcile net income to net cash provided
     (used) by operating activities:
     Depreciation and amortization..........................     4,984        3,731
                                                              --------     --------
                                                                 9,332        6,605
Changes in operating assets and liabilities excluding
  acquisitions of businesses:
     Accounts receivable....................................     2,002       (9,348)
     Inventories and other current assets...................    (8,737)     (17,148)
     Accounts payable and accrued expenses..................    11,066       10,249
     Other..................................................    (2,737)      (2,296)
                                                              --------     --------
       Net Cash Provided (Used) by Operating Activities.....    10,926      (11,938)
INVESTING ACTIVITIES
  Purchases of property, plant and equipment, net...........    (6,304)      (6,254)
  Costs of acquisitions, net of cash acquired...............   (29,146)         -0-
  Purchase of investments...................................      (446)        (101)
                                                              --------     --------
       Net Cash (Used) by Investing Activities..............   (35,896)      (6,355)
FINANCING ACTIVITIES
  Proceeds from bank arrangements for acquisitions..........    29,000          -0-
  Proceeds from bank arrangements for operations............       -0-       17,500
  Payments on debt..........................................    (3,868)         (74)
  Purchase of treasury stock................................       -0-         (237)
  Issuance of common stock under stock option plan..........       -0-           73
                                                              --------     --------
       Net Cash Provided by Financing Activities............    25,132       17,262
                                                              --------     --------
       Increase (Decrease) in Cash and Cash Equivalents.....       162       (1,031)
       Cash and Cash Equivalents at Beginning of Period.....     4,320        1,814
                                                              --------     --------
       Cash and Cash Equivalents at End of Period...........  $  4,482     $    783
                                                              ========     ========
</TABLE>
 
See notes to consolidated financial statements.
 
                                        7
<PAGE>   8
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)
 
                                 MARCH 31, 1999
 
                 (DOLLARS IN THOUSANDS- EXCEPT PER SHARE DATA)
 
NOTE A -- BASIS OF PRESENTATION
 
     The consolidated financial statements include the accounts of Park-Ohio
Industries, Inc. and its subsidiaries ("Park-Ohio," "the Company"). Park-Ohio is
a wholly-owned subsidiary of Park-Ohio Holdings Corp. as of June 10, 1998. All
significant intercompany transactions have been eliminated in consolidation.
 
     The accompanying unaudited consolidated financial statements have been
prepared in accordance with generally accepted accounting principles for interim
financial information and with the instructions to Form 10-Q and Article 10 of
Regulation S-X. Accordingly, they do not include all of the information and
footnotes required by generally accepted accounting principles for complete
financial statements. In the opinion of management, all adjustments (consisting
of normal recurring accruals) considered necessary for a fair presentation have
been included. Operating results for the three month period ended March 31, 1999
are not necessarily indicative of the results that may be expected for the year
ending December 31, 1999. For further information, refer to the consolidated
financial statements and footnotes thereto included in the Company's Annual
Report on Form 10-K for the year ended December 31, 1998.
 
NOTE B -- ACQUISITIONS AND DISPOSITION
 
     During April 1998, the Company completed the acquisition of Direct
Fasteners Limited ("Direct") located in Ontario, Canada. The transaction was
accounted for as a purchase. Direct is a distributor of fasteners. The aggregate
purchase price and the results of operations of Direct prior to the date of
acquisition were not material to the Company.
 
     During September 1998, the Company completed the sale of the assets of
Friendly and Safe Packaging Systems, Inc. to Kerr Group. The transaction had an
immaterial effect on the consolidated results of operation and financial
position of the Company.
 
     During October 1998, the Company acquired all of the shares of GIS
Industries, Inc. ("Gateway"). The transaction has been accounted for as a
purchase. Gateway is a distributor of fasteners and a manufacturer of fabricated
metal products and fasteners. The aggregate purchase price and the results of
operations of Gateway prior to the date of acquisition were not material to the
Company.
 
     During 1999, the Company acquired all of the shares of The Metalloy
Corporation ("Metalloy") and substantially all of the assets of St. Louis Screw
and Bolt ("St. Louis Screw") and PMC Industries, Inc. ("PMC") for cash. Metalloy
is a full service aluminum casting and machining company. St. Louis Screw is a
manufacturer of bolts and PMC provides capital equipment and associated parts
for the oil drilling industry. Each of these transactions has been accounted for
as a purchase. The purchase price and the results of operations of Metalloy and
the two other businesses prior to the date of acquisition were not material to
the Company.
 
NOTE C -- INVENTORIES
 
     The components of inventory consist of the following:
 
<TABLE>
<CAPTION>
                                                              MARCH 31    DECEMBER 31
                                                                1999         1998
                                                              --------    -----------
<S>                                                           <C>         <C>
In process and finished goods...............................  $135,709     $124,783
Raw materials and supplies..................................    32,363       25,269
                                                              --------     --------
                                                              $168,072     $150,052
                                                              ========     ========
</TABLE>
 
                                        8
<PAGE>   9
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
      NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) -- CONTINUED
 
NOTE D -- CORPORATE REORGANIZATION
 
     At the 1998 Annual Meeting of Shareholders of Park-Ohio Industries, Inc.
("Park-Ohio") held on May 28, 1998, the shareholders of Park-Ohio approved an
agreement of Merger ("Merger Agreement") dated February 20, 1998 by and among
Park-Ohio, PKOH Holding Corp. ("Holdings") and PKOH Merger Corp. ("Merger
Corp.") providing for a reorganization of Park-Ohio into a holding company form
of ownership with Holdings as its sole parent. On June 10, 1998, Holdings
amended and restated its articles of incorporation to increase its authorized
shares from 100 shares of common stock, $1.00 par value per share, to 40,000,000
shares of common stock and 632,470 shares of preferred stock, all $1.00 par
value per share, and changed its name from PKOH Holding Corp. to Park-Ohio
Holdings Corp. Effective as of the close of business on June 15, 1998, Merger
Corp. was merged with and into Park-Ohio upon the terms and conditions of the
Merger Agreement. At the effective time of the Merger, (i) all of the shares of
Park-Ohio's common stock issued and outstanding immediately prior to the Merger
were converted into an equal number of shares of Holdings' common stock (on a
share-for-share basis), (ii) all of the shares of Merger Corp.'s common stock
issued and outstanding immediately prior to the Merger were converted into 100
shares of Park-Ohio's common stock and (iii) all of the shares of Holdings'
common stock issued and outstanding immediately prior to the Merger were
canceled.
 
     Prior to the Merger, there was no public market for Holdings' common stock,
and Park-Ohio's common stock was listed for trading on the NASDAQ National
Market under the symbol "PKOH". Upon the opening of the market after the
effective time of the Merger: (i) Holdings' common stock was registered under
Section 12 (g) of the Securities Exchange Act of 1934, as amended (the "Exchange
Act"), and was listed for trading on the NASDAQ National Market under the symbol
"PKOH"; (ii) Park-Ohio common stock was simultaneously delisted from the NASDAQ
National Market and ceased to be registered under Section 12 (g) of the Exchange
Act; and (iii) Holdings assumed Park-Ohio's reporting obligations under the
Exchange Act.
 
NOTE E -- ACCOUNTING PRONOUNCEMENTS
 
     In March 1998, the American Institute of Certified Public Accountants
("AICPA") issued Statement of Position ("SOP") 98-1, "Accounting for the Cost of
Computer Software Developed or Obtained for Internal Use". The SOP requires
companies to capitalize qualifying computer software costs incurred during the
application development stage. This statement is applied prospectively and is
effective for financial statements for fiscal years beginning after December 15,
1998. The Company adopted the SOP in the first quarter of 1999. The impact of
this new standard did not have a significant effect on the Company's financial
position or results of operations.
 
     In April 1998, the AICPA issued SOP 98-5, "Accounting for the Costs of
Start-up Activities". The SOP requires that costs of start-up activities be
expensed as incurred. The SOP is effective for fiscal years beginning after
December 15, 1998. The Company adopted the SOP in the first quarter of 1999. The
impact of adoption of the SOP on the Company's financial position, results of
operations or cash flows was immaterial.
 
     The Financial Accounting Standards Board's Statement of Financial
Accounting Standards No. 133, "Accounting for Derivative Instruments and Hedging
Activities" was issued in June 1998. Statement 133 requires derivatives to be
recorded on the balance sheet at fair value and establishes accounting for three
different types of hedges: hedges of changes in fair value of assets,
liabilities, or firm commitments; hedges of the variable cash flows of
forecasted transactions; and hedges of foreign currency exposures of net
investments in foreign operations. Statement 133 is effective for years
beginning after June 15, 1999 and is not expected to have a significant impact
on the Company's financial position or results of operations.
 
                                        9
<PAGE>   10
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
 
      NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) -- CONTINUED
 
NOTE F -- SEGMENTS
 
     During the first quarter of 1999 the Company, upon completion of the
acquisition of Metalloy, a full service aluminum casting and machining company,
redefined its operating segments. The Company retained its Integrated Logistics
Solutions ("ILS") segment and further segregated its former Manufactured
Products segment into an Aluminum Products segment and a Manufactured Products
segment. ILS is a leading national supplier of fasteners (e.g. nuts, bolts and
screws) and other industrial products to original equipment manufacturers, other
manufacturers and distributors. In connection with the supply of such industrial
products, ILS provides a variety of value-added, cost-effective procurement
solutions. Aluminum Products manufactures cast aluminum critical components
primarily for automotive original equipment manufacturers. In addition, Aluminum
Products also provides value-added services such as design and engineering,
machining and assembly. Manufactured Products is a diverse group of
manufacturing businesses that design and manufacture a broad range of high
quality products for specific customer applications.
 
     Results by Business Segment were as follows:
 
<TABLE>
<CAPTION>
                                                                 THREE MONTHS ENDED
                                                                      MARCH 31
                                                              -------------------------
                                                                1999           1998
                                                              ---------    ------------
<S>                                                           <C>          <C>
Net sales, including intersegment sales:
     ILS....................................................  $106,412       $ 91,794
     Aluminum products......................................    31,619          9,904
     Manufactured products..................................    33,372         34,805
                                                              --------       --------
                                                              $171,403       $136,503
                                                              ========       ========
Income before income taxes:
     ILS....................................................  $ 10,965       $  7,920
     Aluminum products......................................     2,971            633
     Manufactured products..................................       972          2,087
                                                              --------       --------
                                                                14,908         10,640
Amortization of excess purchase price over net assets
  acquired..................................................      (814)          (381)
Corporate costs.............................................    (1,079)        (1,064)
Interest expense............................................    (5,378)        (4,152)
                                                              --------       --------
                                                              $  7,637       $  5,043
                                                              ========       ========
</TABLE>
 
     Identifiable assets were as follows:
 
<TABLE>
<CAPTION>
                                                              MARCH 31,    DECEMBER 31,
                                                                1999           1998
                                                              ---------    ------------
<S>                                                           <C>          <C>
     ILS....................................................  $307,369       $288,713
     Aluminum products......................................    96,118         40,063
     Manufactured products..................................   155,496        147,009
     General corporate......................................     6,298         13,769
                                                              --------       --------
                                                              $565,281       $489,554
                                                              ========       ========
</TABLE>
 
                                       10
<PAGE>   11
 
                     INDEPENDENT ACCOUNTANTS' REVIEW REPORT
 
Board of Directors and Shareholders
Park-Ohio Industries, Inc.
 
     We have reviewed the accompanying consolidated balance sheet of Park-Ohio
Industries, Inc. and subsidiaries as of March 31, 1999, and the related
consolidated statements of income for the three months ended March 31, 1999 and
1998, the consolidated statement of shareholder's equity for the three months
ended March 31, 1999 and the consolidated statements of cash flows for the three
months ended March 31, 1999 and 1998. These financial statements are the
responsibility of the Company's management.
 
     We conducted our review in accordance with standards established by the
American Institute of Certified Public Accountants. A review of interim
financial information consists principally of applying analytical procedures to
financial data, and making inquiries of persons responsible for financial and
accounting matters. It is substantially less in scope than an audit conducted in
accordance with generally accepted auditing standards, which will be performed
for the full year with the objective of expressing an opinion regarding the
financial statements taken as a whole. Accordingly, we do not express such an
opinion.
 
     Based upon our reviews, we are not aware of any material modifications that
should be made to the accompanying consolidated financial statements referred to
above for them to be in conformity with generally accepted accounting
principles.
 
     We have previously audited, in accordance with generally accepted auditing
standards, the consolidated balance sheet of Park-Ohio Industries, Inc. and
subsidiaries as of December 31, 1998 and the related consolidated statements of
income, shareholder's equity, and cash flows for the year then ended, not
presented herein, and in our report dated February 15, 1999, we expressed an
unqualified opinion on those consolidated financial statements. In our opinion,
the information set forth in the accompanying consolidated balance sheet as of
December 31, 1998, is fairly stated, in all material respects, in relation to
the consolidated balance sheet from which it is derived.
 
                                            /s/ ERNST & YOUNG LLP
 
Cleveland, Ohio
April 20, 1999
 
                                       11
<PAGE>   12
 
ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
        OF OPERATIONS
 
     The consolidated financial statements of the Company include the accounts
of Park-Ohio Industries, Inc., a wholly-owned subsidiary of Park-Ohio Holdings,
Corp., and its subsidiaries. All significant intercompany transactions have been
eliminated in consolidation. The financial information for the three-month
period ended March 31, 1999 is not directly comparable on a period-to-period
basis to the financial information for the three-month period ended March 31,
1998 due to acquisitions made subsequent to the first quarter of 1998. During
1998, the Company acquired two businesses for $40.2 million. During October,
1998, the Company acquired all of the shares of GIS Industries, Inc.
("Gateway"). Gateway is a distributor of fasteners and a manufacturer of metal
products and fasteners. During April, 1998, the Company acquired all of the
shares of Direct Fasteners Limited ("Direct"), a distributor of fasteners
located in Ontario, Canada. During 1999, the Company acquired all of the shares
of The Metalloy Corporation ("Metalloy") and St. Louis Screw and Bolt ("St.
Louis Screw") and the assets of PMC Industries, Inc. ("PMC") for $29.1 million.
Metalloy is a full service aluminum casting and machining company. St. Louis
Screw is a manufacturer of bolts and PMC provides capital equipment and
associated parts for the oil drilling industry. All acquisitions are accounted
for as purchases and consequently their results are included in the consolidated
financial statements from their respective dates of acquisition.
 
OVERVIEW
 
     The Company operates diversified manufacturing and logistics businesses
that serve a wide variety of industrial markets. The Company defines its
businesses into three operating segments: Integrated Logistics Solutions
("ILS"), Aluminum Products, and Manufactured Products. ILS is a leading national
supplier of fasteners (e.g., nuts, bolts and screws) and other industrial
products to original equipment manufacturers ("OEMs"), other manufacturers and
distributors. In connection with the supply of such industrial products, ILS
provides a variety of value-added, cost-effective procurement solutions. The
principal customers of ILS are in the transportation, industrial, electrical and
lawn and garden equipment industries. Aluminum Products also manufactures cast
aluminum critical components primarily for automotive OEMs. Aluminum Products
provides value-added services such as design and engineering, machining and
assembly. Manufactured Products operates a diverse group of niche manufacturing
businesses that design and manufacture a broad range of high quality products
engineered for specific customer applications. The principal customers of
Manufactured Products are OEMs and end-users in the automotive, railroad, truck
and aerospace industries.
 
     Between 1993 and 1998, the Company has grown significantly, both internally
and through acquisitions. Over this period, the Company's net sales increased at
a 42% compounded annual growth rate ("CAGR"), from $94.5 million to $551.8
million, and income from continuing operations on a fully taxed basis increased
at a 40% CAGR from $2.4 million to $12.9 million.
 
     Recent growth has been primarily attributable to the Company's strategy of
making selective acquisitions in order to complement internal growth.
Historically, the Company has acquired underperforming businesses with potential
for: (i) significant cost reductions through improved labor, supplier and
customer relations and increased purchasing power and (ii) revenue enhancement
due to better asset utilization and management practices, as well as increased
access to capital. The Company's internal growth has been driven primarily by
the addition of ILS customers under total fastening service ("TFS") contracts
and by the leveraging of existing customer relationships in the Aluminum and
Manufactured Products segments.
 
     Between January 1, 1994 and March 31, 1999, the Company's continuing
operations incurred $70.5 million of capital expenditures, the majority of which
was used to expand and upgrade existing manufacturing facilities and enhance the
Company's management information systems.
 
RESULTS OF OPERATIONS
 
THREE MONTHS 1999 VERSUS THREE MONTHS 1998
 
     Net sales increased by $34.9 million, or 26%, from $136.5 million for the
first three months of 1998 to $171.4 million for the three months ended March
31, 1999. This growth results from acquisitions that the
 
                                       12
<PAGE>   13
 
Company made subsequent to March 31, 1998 and relates primarily to the ILS and
the Aluminum Products segments. For ILS, the growth in net sales from
acquisitions amounted to $12.7 million and related to Gateway and Direct. For
Aluminum Products, net sales increased by $21.7 million and related primarily to
the acquisition of Metalloy.
 
     Gross profit increased by $7.6 million, or 33%, from $23.3 million for the
first three months of 1998 to $30.9 million for the first three months of 1999
and is directly related to acquisitions made in the preceding twelve months. The
Company's consolidated gross margin increased to 18.1% for the first three
months of 1999 from 17.1% for the first three months of 1998. This increase in
consolidated gross margin was due to increased margins in both the Aluminum
Products and ILS segments more than offsetting a decline in gross margins in the
Manufactured Products segment. The increase in the Aluminum Products segment
gross margin was due to increased production at General Aluminum thereby
allocating fixed manufacturing overhead over a greater production base and to
the acquisition of Metalloy which has a higher overall gross margin than the
existing business. The increase in margins in the ILS segment is a result of
spreading operating costs over a growing revenue base resulting from the recent
acquisitions in ILS and favorable raw material sourcing. The decline in margins
in the Manufactured Products segment results primarily from reduced production
activity at Ajax Manufacturing Company which caused fixed overhead costs to be
spread over a lesser production base.
 
     Selling, general and administrative costs increased by 28% to $18.0 million
for the first three months of 1999 from $14.1 million for the first three months
of 1998. This increase was related to the acquisitions that have been
consummated subsequent to the first quarter of 1998. Consolidated selling,
general and administrative expenses as a percentage of net sales was
approximately the same for both periods.
 
     Interest expense increased by $1.2 million from $4.2 million for the
three-month period ended March 31, 1998 to $5.4 million for the three-month
period ended March 31, 1999 due to higher average debt outstanding during the
current period offset by lower average interest rates in 1999 versus 1998. For
the three-month period ended March 31, 1999, the Company averaged outstanding
borrowings of $265.2 million as compared to $182.6 million outstanding for the
three months ended March 31, 1998. The $82.6 million increase related primarily
to acquisitions completed during the latter part of 1998 and the first quarter
of 1999 with the remainder primarily related to working capital increases to
support the realized and anticipated growth in business and to capital
expenditures to support growth in the business. The average borrowing rate of
8.1% for the three months ended March 31, 1999 is 1.0% lower than the average
rate of 9.1% for the three months ended March 31, 1998 primarily because of
averaging increased borrowings under the Company's bank revolving credit which
carry lower effective interest rates with the Company's subordinated debt which
carries a higher coupon rate.
 
     The effective income tax rate for the three-month periods ended March 31,
1999 and 1998 was 43%. At December 31, 1998, subsidiaries of the Company had
$1.1 million of net operating loss carryforwards for tax purposes.
 
SEASONALITY; VARIABILITY OF OPERATING RESULTS
 
     As a result of the significant growth in the Company's net sales and
operating income in recent years, seasonal fluctuations have been substantially
mitigated. The Company, however, performs scheduled plant maintenance in the
third quarter to coincide with customer plant shut downs.
 
     The timing of orders placed by the Company's customers has varied with,
among other factors, orders for customers' finished goods, customer production
schedules, competitive conditions and general economic conditions. The
variability of the level and timing of orders has, from time to time, resulted
in significant periodic and quarterly fluctuations in the operations of the
Company's business units. Such variability is particularly evident at the
capital equipment businesses, included in the Manufactured Products segment,
which typically ship a few large systems per year.
 
                                       13
<PAGE>   14
 
FORWARD-LOOKING STATEMENTS
 
     This Form 10-Q contains certain statements that are "forward-looking
statements" within the meaning of Section 27A of the Securities Act and Section
21E of the Exchange Act. Certain statements in this Management's Discussion and
Analysis of Financial Condition and Results of Operations contain forward-
looking statements. Forward-looking statements are necessarily subject to risks,
uncertainties and other factors, many of which are outside the control of the
Company, that could cause actual results to differ materially from such
statements. These uncertainties and other factors include such things as:
general business conditions, competitive factors, including pricing pressures
and product innovation and quality; raw material availability and pricing;
changes in the Company's relationships with customers and suppliers; the ability
of the Company to successfully integrate recent and future acquisitions into its
existing operations; changes in general domestic economic conditions such as
inflation rates, interest rates and tax rates; increasingly stringent domestic
and foreign governmental regulations including those affecting the environment;
inherent uncertainties involved in assessing the Company's potential liability
for environmental remediation-related activities; the outcome of pending and
future litigation and other claims; dependence on the automotive industry;
dependence on key management; dependence on information systems; and the ability
of the Company, its vendors and customers to achieve Y2K compliance. Any
forward-looking statement speaks only as of the date on which such statement is
made, and the Company undertakes no obligation to update any forward-looking
statement, whether as a result of new information, future events or otherwise.
In light of these and other uncertainties, the inclusion of a forward-looking
statement herein should not be regarded as a representation by the Company that
the Company's plans and objectives will be achieved.
 
REVIEW BY INDEPENDENT ACCOUNTANTS
 
     The consolidated financial statements at March 31, 1999, and for the
three-month periods ended March 31, 1999 and 1998, have been reviewed, prior to
filing, by Ernst & Young LLP, the Company's independent accountants, and their
report is included herein.
 
                                       14
<PAGE>   15
 
                                    PART II
 
                               OTHER INFORMATION
 
ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K
 
     The following exhibits are included herein:
 
<TABLE>
<C>   <S>
(15)  Letter re: unaudited financial information
(27)  Financial data schedule (Electronic filing only)
</TABLE>
 
     The Company did not file any reports on Form 8-K during the three months
ended March 31, 1999.
 
                                   SIGNATURE
 
     Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has caused this report to be signed on its behalf by the undersigned,
thereunto duly authorized.
                                                 PARK-OHIO INDUSTRIES, INC.
                                            ------------------------------------
                                                        (Registrant)
 
                                            By       /s/ J. S. WALKER
                                             -----------------------------------
                                            Name:            J. S. Walker
                                            Title:              Vice President
                                            and Chief
                                                                Financial
                                            Officer
 
                                            Dated:            May 11, 1999
                                            ------------------------------------
 
                                       15
<PAGE>   16
 
                                 EXHIBIT INDEX
 
                         QUARTERLY REPORT ON FORM 10-Q
 
                  PARK-OHIO INDUSTRIES, INC. AND SUBSIDIARIES
                      FOR THE QUARTER ENDED MARCH 31, 1999
 
<TABLE>
<CAPTION>
EXHIBIT
-------
<C>        <S>
 (15)      Letter re: unaudited financial information
 (27)      Financial data schedule (Electronic filing only)
</TABLE>
 
                                       16