ORBITAL SCIENCES CORP /DE/
10-Q, 1999-11-22
SEARCH, DETECTION, NAVAGATION, GUIDANCE, AERONAUTICAL SYS
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<PAGE>   1

                       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


                              For the quarter ended

                               SEPTEMBER 30, 1999


                          ORBITAL SCIENCES CORPORATION


                         Commission file number 0-18287

<TABLE>
<CAPTION>
<S>                                                                    <C>
                       DELAWARE                                                       06-1209561
  ---------------------------------------------------                  ------------------------------------------
               (State of Incorporation)                                       (IRS Identification number)

               21700 ATLANTIC BOULEVARD
                DULLES, VIRGINIA 20166                                              (703) 406-5000
  ---------------------------------------------------                  ------------------------------------------
       (Address of principal executive offices)                                   (Telephone number)
</TABLE>

The registrant has (1) 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.

As of November 15, 1999, 37,416,772 shares of the registrant's common stock were
outstanding.
<PAGE>   2
                             FINANCIAL INFORMATION
ITEM 1. FINANCIAL STATEMENTS



                          ORBITAL SCIENCES CORPORATION
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                        (In thousands, except share data)

<TABLE>
<CAPTION>
                                   A S S E T S
                                                                                SEPTEMBER 30,        DECEMBER 31,
                                                                                    1999                 1998
                                                                                 -----------         -----------
                                                                                                      (RESTATED)
<S>                                                                              <C>                 <C>
CURRENT ASSETS:
          Cash and cash equivalents                                              $    21,066         $    17,764
          Restricted cash and short-term investments, at market                       18,174               7,922
          Receivables, net                                                           270,449             205,409
          Inventories, net                                                            65,053              64,710
          Deferred income taxes and other assets                                      11,357               8,252
                                                                                 -----------         -----------
            TOTAL CURRENT ASSETS                                                     386,099             304,057

PROPERTY, PLANT AND EQUIPMENT, at cost, less accumulated
    depreciation and amortization of $122,495 and $103,450, respectively             186,710             157,075

INVESTMENTS IN AND ADVANCES TO AFFILIATES, net                                       200,460             208,196

EXCESS OF PURCHASE PRICE OVER NET ASSETS ACQUIRED,
    less accumulated amortization of $37,912 and $27,542, respectively               277,508             228,624

DEFERRED INCOME TAXES AND OTHER ASSETS, less accumulated
   amortization of $1,567 and none, respectively                                      71,543              35,393
                                                                                 -----------         -----------
                            TOTAL ASSETS                                         $ 1,122,320         $   933,345
                                                                                 ===========         ===========


                      LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
          Short-term borrowings and current portion of
              long-term obligations                                              $    55,612         $    26,814
          Accounts payable                                                            67,306              39,093
          Accrued expenses                                                           109,480             110,833
          Deferred revenues                                                          143,976              82,364
                                                                                 -----------         -----------
               Total current liabilities                                             376,374             259,104

LONG-TERM OBLIGATIONS, net of current portion                                        313,925             181,281

OTHER LIABILITIES                                                                     13,998               3,007
                                                                                 -----------         -----------
                            TOTAL LIABILITIES                                        704,297             443,392

NON-CONTROLLING INTERESTS IN
     NET ASSETS OF CONSOLIDATED SUBSIDIARIES                                           9,506              17,150

COMMITMENTS AND CONTINGENCIES

STOCKHOLDERS' EQUITY:
          Preferred Stock, par value $.01; 10,000,000 shares authorized:
               none outstanding                                                           --                  --
          Common Stock, par value $.01; 80,000,000 shares authorized,
               37,395,343 and 37,018,256 shares outstanding, respectively
               after deducting 20,877 shares held in treasury                            374                 370
          Additional paid-in capital                                                 496,651             490,540
          Accumulated other comprehensive income                                      (6,119)             (7,225)
          Accumulated deficit                                                        (82,389)            (10,882)
                                                                                 -----------         -----------
               Total stockholders' equity                                            408,517             472,803

                                                                                 -----------         -----------
                            TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY           $ 1,122,320         $   933,345
                                                                                 ===========         ===========
</TABLE>

     See accompanying notes to condensed consolidated financial statements.

                                       -2-
<PAGE>   3
                          ORBITAL SCIENCES CORPORATION
                  CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
                        (In thousands, except share data)

<TABLE>
<CAPTION>
                                                                   FOR THE THREE MONTHS ENDED
                                                                           SEPTEMBER 30,
                                                              -------------------------------------
                                                                  1999                     1998
                                                              ------------             ------------
                                                                                        (RESTATED)

<S>                                                           <C>                      <C>
REVENUES                                                      $    248,914             $    187,688

COSTS OF GOODS SOLD                                                194,187                  141,195
                                                              ------------             ------------
GROSS PROFIT                                                        54,727                   46,493

RESEARCH AND DEVELOPMENT EXPENSES                                    9,109                   14,239
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                        30,593                   20,979
AMORTIZATION OF EXCESS OF PURCHASE PRICE OVER
    NET ASSETS ACQUIRED                                              3,843                    1,983
                                                              ------------             ------------
INCOME FROM OPERATIONS                                              11,182                    9,292


NET INVESTMENT INCOME (EXPENSE)                                     (5,722)                    (667)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                          (37,550)                 (11,747)
NON-CONTROLLING INTERESTS IN (EARNINGS) LOSSES
    OF CONSOLIDATED SUBSIDIARIES                                     1,723                    2,458
                                                              ------------             ------------
LOSS BEFORE PROVISION FOR INCOME TAXES                             (30,367)                    (664)

PROVISION FOR INCOME TAXES                                           2,282                      826
                                                              ------------             ------------
NET LOSS                                                      $    (32,649)            $     (1,490)
                                                              ============             ============
NET LOSS PER COMMON SHARE                                     $      (0.87)            $      (0.04)


SHARES USED IN COMPUTING NET LOSS PER COMMON SHARE              37,384,519               36,757,055
                                                              ============             ============
</TABLE>

     See accompanying notes to condensed consolidated financial statements.

                                       -3-
<PAGE>   4
                          ORBITAL SCIENCES CORPORATION
                  CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS
                        (In thousands, except share data)

<TABLE>
<CAPTION>
                                                                   FOR THE NINE MONTHS ENDED
                                                                          SEPTEMBER 30,
                                                              -------------------------------------
                                                                 1999                      1998
                                                              ------------             ------------
                                                                                        (RESTATED)
<S>                                                           <C>                      <C>
REVENUES                                                      $    685,538             $    558,363

COSTS OF GOODS SOLD                                                529,668                  409,645
                                                              ------------             ------------
GROSS PROFIT                                                       155,870                  148,718

RESEARCH AND DEVELOPMENT EXPENSES                                   29,227                   34,255
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES                        89,389                   77,634
AMORTIZATION OF EXCESS OF PURCHASE PRICE OVER
    NET ASSETS ACQUIRED                                              9,932                    5,921
                                                              ------------             ------------
INCOME FROM OPERATIONS                                              27,322                   30,908


NET INVESTMENT INCOME (EXPENSE)                                    (13,410)                  (3,745)
EQUITY IN EARNINGS (LOSSES) OF AFFILIATES                          (87,287)                 (43,796)
NON-CONTROLLING INTERESTS IN (EARNINGS) LOSSES
    OF CONSOLIDATED SUBSIDIARIES                                     7,476                    7,573
                                                              ------------             ------------

LOSS BEFORE PROVISION FOR INCOME TAXES                             (65,899)                  (9,060)

PROVISION FOR INCOME TAXES                                           5,608                    3,131
                                                              ------------             ------------
NET LOSS                                                      $    (71,507)            $    (12,191)
                                                              ============             ============


NET LOSS PER COMMON SHARE                                     $      (1.92)            $      (0.35)


SHARES USED IN COMPUTING NET LOSS PER COMMON SHARE              37,240,742               35,199,984
                                                              ============             ============
</TABLE>

     See accompanying notes to condensed consolidated financial statements.

                                       -4-
<PAGE>   5
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (In thousands)

<TABLE>
<CAPTION>
                                                                                                     FOR THE NINE MONTHS ENDED
                                                                                                            SEPTEMBER 30,
                                                                                                 -------------------------------
                                                                                                   1999                  1998
                                                                                                 ---------             ---------
                                                                                                                       (RESTATED)
<S>                                                                                              <C>                   <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
     NET LOSS                                                                                    $ (71,507)            $ (12,191)
     ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO NET CASH PROVIDED BY (USED
           IN) OPERATING ACTIVITIES:
                Depreciation and amortization expenses                                              36,302                27,300
                Amortization of prepaid financing costs                                              1,664                 5,579
                Equity in losses of affiliates                                                      87,287                43,796
                Non-controlling interests in losses of consolidated subsidiaries                    (7,476)               (7,573)
                Loss on sales of assets                                                                992                    --
                Foreign currency translation adjustments                                             1,711                (1,076)
        CHANGES IN ASSETS AND LIABILITIES:
             (Increase) decrease in current and other non-current assets                           (32,405)              (34,320)
             Increase (decrease) in current and other non-current liabilities                       36,720                (6,349)
                                                                                                 ---------             ---------
             NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES                                    53,288                15,166
                                                                                                 ---------             ---------

CASH FLOWS FROM INVESTING ACTIVITIES:
     Capital expenditures                                                                          (47,158)              (33,259)
     Payments for business combinations                                                            (26,374)                   --
     Purchase of other assets                                                                      (14,006)                   --
     Purchases, sales and maturities of available-for-sale investment securities, net               (8,276)                8,510
     Investments in and advances to affiliates, net                                                (74,946)              (83,260)
                                                                                                 ---------             ---------
             NET CASH USED IN INVESTING ACTIVITIES                                                (170,760)             (108,009)
                                                                                                 ---------             ---------


CASH FLOWS FROM FINANCING ACTIVITIES:
     Net short-term borrowings (repayments)                                                            135                17,440
     Principal payments on long-term obligations                                                   (90,476)              (79,283)
     Net proceeds from issuances of long-term obligations                                          205,000                27,000
     Net proceeds from issuances of common stock                                                     6,115               160,777
                                                                                                 ---------             ---------
             NET CASH PROVIDED BY FINANCING ACTIVITIES                                             120,774               125,934
                                                                                                 ---------             ---------


NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                                 3,302                33,091


CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD                                                      17,764                12,553
                                                                                                 ---------             ---------
CASH AND CASH EQUIVALENTS, END OF PERIOD                                                         $  21,066             $  45,644
                                                                                                 =========             =========
</TABLE>

     See accompanying notes to condensed consolidated financial statements.

                                       -5-
<PAGE>   6
ORBITAL SCIENCES CORPORATION
NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
SEPTEMBER 30, 1999 AND 1998
(UNAUDITED)

(1)      BASIS OF PRESENTATION

Orbital Sciences Corporation, together with its subsidiaries, is hereafter
referred to as "Orbital" or the "company." As discussed below, the company is
continuing to work to resolve certain pending questions relating to previously
published financial data, which may also affect current financial data.
Accordingly, the accompanying financial statements are preliminary. These
preliminary financial statements reflect the company's determination of the
effects of presently known adjustments as discussed in Note 2 below. The
resolution of the pending matters could result in further adjustments to the
financial statements for any or all of the periods presented in this Report on
Form 10-Q. Neither the company's current nor its former independent auditors
have reviewed or approved the preliminary results reported herein.

In the opinion of management and subject to potential additional adjustments
that might be necessary as described below, the accompanying unaudited interim
financial information reflects all adjustments, consisting of normal recurring
accruals, necessary for a fair presentation thereof. Certain information and
footnote disclosure normally included in financial statements prepared in
accordance with generally accepted accounting principles have been condensed or
omitted pursuant to instructions, rules and regulations prescribed by the
Securities and Exchange Commission (the "Commission"). The company believes that
the disclosures provided herein are adequate to make the information presented
not misleading when these unaudited interim condensed consolidated financial
statements are read in conjunction with the company's Annual Report on Form 10-K
for the year ended December 31, 1998 (provided that the company's consolidated
financial statements and the footnotes thereto included in such Annual Report on
Form 10-K have not yet been revised to reflect the restatement and the
unresolved pending accounting matters discussed in Notes 1 and 2 hereto).
Operating results for the three- and nine-month periods ended September 30, 1999
are not necessarily indicative of the results expected for the full year.

Pending Matters

The company's current auditors have raised questions arising out of prior year
valuations of the company's subsidiary, Magellan Corporation ("Magellan"),
reflected in the company's audited 1997 and 1998 financial statements. These
questions are still under review, and the effect of a change in previously
audited and unaudited financial statements as well as these unaudited

                                       6
<PAGE>   7
financial statements, if any, relating to Magellan has not yet been determined.
In addition, the company's current auditors have questions pertaining to the
company's accounting for certain transactions related to its investments in
Orbital Imaging Corporation ("ORBIMAGE") and CCI International, N.V. ("CCI") in
addition to those discussed below. There can be no assurance that the company's
current auditors or its previous auditors will not raise additional questions.

Final resolution of these matters, including the determination of the impact of
any resultant changes, has not been completed. Accordingly, the accompanying
financial statements are preliminary, and may change as a result of resolution
of the issues that remain under discussion. The company is seeking to resolve
these matters as expeditiously as possible. Once the outstanding issues are
resolved, the company plans to publish revised financial data.

(2)      RESTATEMENTS

As a result of the events described below, management has determined to revise
its previously audited accounting treatment with respect to its investments in
its affiliates, ORBIMAGE and CCI. Orbital's previous independent auditors
reviewed and approved the company's prior accounting treatment and had
concluded that the company's financial statements were fairly presented in
accordance with generally accepted accounting principles in 1997 and 1998. In
preparation for the 1999 audit, the company's current independent auditors
questioned certain aspects of the accounting treatment relating to ORBIMAGE and
CCI. The company's previous auditors have now changed their position with
respect to this accounting treatment and they have informed the company that
its financial statements should be restated for fiscal years ended December 31,
1997 and 1998, for the last three quarters of 1997 and for all four quarters of
1998, and that their earlier independent auditors' reports with respect to
these periods should no longer be relied upon. (The change with respect to
accounting for the CCI investment does not affect 1997 financial statements
because the investment was made in 1998.) Upon resolution of the pending
matters described in Note 1 above, the company will restate its financial
statements for the prior periods and for the first two quarters of 1999. The
financial statements contained in this report on Form 10-Q reflect the
restatement adjustments described below, but could be modified further
depending on resolution of the pending matters described above.

Restatement Adjustments

(a) The company uses the equity method of accounting for its investments in
affiliates in which the company has the ability to significantly influence, but
not control, such affiliates' operations. Accordingly, Orbital uses the equity
method of accounting for its investments in ORBIMAGE and CCI.

As a result of certain participating rights granted to holders of convertible
preferred stock of ORBIMAGE, Orbital significantly influences but does not
control ORBIMAGE even though it owns substantially all of ORBIMAGE's
outstanding common stock. The company's historical audited and unaudited
financial statements previously filed with the

                                       7
<PAGE>   8
Commission reflected the company's application of the equity method of
accounting as it pertained to ORBIMAGE based on Orbital's percentage share of
ownership of ORBIMAGE calculated to give the effect to the conversion of
ORBIMAGE's outstanding convertible preferred stock into ORBIMAGE common stock.
Following the notification from the company's previous auditors as described
above, the company has revised its application of the equity method of
accounting with respect to its investment in ORBIMAGE to now be based upon its
common stock ownership percentage without giving effect to the conversion of
the preferred stock. The company has also similarly revised its application of
the equity method of accounting with respect to its investment in CCI.

This revision of the application of the equity method of accounting related to
the company's investments in ORBIMAGE and CCI resulted in Orbital increasing
its equity in losses of affiliates for the first half of 1999 and for the
three- and nine-month periods ended September 30, 1998 by $5,391,000, $325,000
and $10,130,000, respectively.

(b) ORBIMAGE's preferred stockholders are entitled to receive a cumulative
dividend, payable either in cash or in additional shares of convertible
preferred stock, and to date all dividends have been paid in additional shares
of convertible preferred stock. The company's historical audited and unaudited
financial statements previously filed with the Commission did not reflect
additional net losses as a result of ORBIMAGE's declaration of such "in-kind"
dividends on its convertible preferred stock. Following the notification from
the company's previous auditors as described above, Orbital now calculates its
equity in losses of affiliates taking into account ORBIMAGE's preferred stock
dividends.

This revision of the accounting for ORBIMAGE's preferred stock dividends
resulted in Orbital increasing its equity in losses of affiliates by $4,209,000
for the first half of 1999 and by $1,957,000 and $5,311,000 for the three- and
nine- month periods ended September 30, 1998, respectively.

(c) The company's historical audited and unaudited financial statements
previously filed with the Commission reflected the company's capitalization of
interest expense on its investment in ORBIMAGE. Following the notification from
the company's previous auditors as described above, Orbital is no longer
capitalizing interest expense on its investment in ORBIMAGE.

This revision of the accounting for the capitalization of interest expense
resulted in Orbital increasing its reported interest expense (and decreasing
its reported capitalized interest expense) by $3,238,000 for the first half of
1999 and by $1,644,000 and $5,136,000 for the three- and nine-month periods
ended September 30, 1998, respectively.

                                       8
<PAGE>   9
(d) The company's historical audited and unaudited financial statements
previously filed with the Commission reflected recognition of a gain in the
second quarter of 1998 on ORBIMAGE's issuance of common stock purchase
warrants, in accordance with Orbital's stated accounting policy on sales of
subsidiary and affiliate equity. Following the notification from the company's
previous auditors as described above, the company has decreased its reported
gain on sale of affiliate equity by $4,793,000 in the second quarter of 1998.

(3)      PREPARATION OF CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The preparation of condensed consolidated financial statements in conformity
with generally accepted accounting principles requires management to make
estimates and assumptions that affect the reported amounts of assets and
liabilities and the disclosure of contingent assets and liabilities at the date
of the consolidated financial statements and the reported amounts of revenues
and expenses during the reporting period. Management periodically assesses and
evaluates the sufficiency and/or deficiency of estimated liabilities recorded
for various operational and business risks and uncertainties. Actual results
could differ from these estimates. See also Notes 1 and 2 above.

Certain reclassifications have been made to the 1998 financial statements and
footnote disclosures to conform to the 1999 financial statement presentation.
All financial amounts are stated in U.S. dollars unless otherwise indicated.

(4)      INVENTORIES

Inventories consist of components and raw materials inventory, work-in-process
inventory and finished goods inventory and are generally stated at the lower of
cost or net realizable value on a first-in, first-out or specific identification
basis, net of allowances for estimated obsolescence.

Components and raw materials are purchased to support future production efforts.
Work-in-process inventory consists primarily of (i) costs incurred under
long-term fixed-price contracts accounted for using the percentage-of-completion
method of accounting applied on a units of delivery basis, and (ii) partially
assembled commercial products, and generally includes direct production costs
and certain allocated indirect costs (including an allocation of general and
administrative costs). Work-in-progress inventory has been reduced by
contractual progress payments received. Finished goods inventory consists of
fully assembled commercial products awaiting shipment.

(5)      DISAGGREGATED FINANCIAL INFORMATION

Orbital's operations are organized into three business sectors, which correspond
to different product and service types, the different markets served by such
products and services, and the manner in which these products and services are
managed. Orbital's

                                       9
<PAGE>   10
three business sectors are: space and ground infrastructure systems, satellite
access products and satellite services. Space and ground infrastructure systems
include launch vehicles, satellites and related space systems, electronics and
sensor systems and transportation management systems, and satellite ground
systems, software, mapping and land information services. Satellite access
products include satellite-based navigation, positioning and communications
products. Satellite services include satellite-based mobile data communications
services, satellite-based remote imaging services, satellite-based automotive
information services and satellite-based voice communications services.

The following table presents preliminary operating information for the three and
nine months ended September 30, 1999 and 1998 by business sector. Operating
income (loss) is total revenues less costs of goods sold, research and
development expenses, selling, general and administrative expenses, and
amortization of goodwill. Identifiable assets are those assets used in the
operations of each business. There were no significant sales or transfers
between consolidated sectors.

<TABLE>
<CAPTION>
                                             THREE MONTHS             THREE MONTHS            NINE MONTHS             NINE MONTHS
(In thousands)                                   1999                    1998                     1999                    1998
                                              -----------             -----------             -----------             -----------
                                                                      (Restated)                                       (Restated)
<S>                                           <C>                     <C>                     <C>                     <C>
SPACE AND GROUND
  INFRASTRUCTURE SYSTEMS:
    Revenues                                  $   200,067             $   164,512             $   570,671             $   483,308
    Operating income                               15,267                  16,284                  47,748                  49,659
    Identifiable assets (1)                       803,750                 593,818                 803,750                 593,818
    Capital expenditures                           11,953                  10,726                  38,370                  30,017
    Depreciation and amortization                  10,746                   5,439                  28,198                  21,770

SATELLITE ACCESS PRODUCTS:
    Revenues                                  $    44,579             $    23,037             $   103,162             $    74,593
    Operating loss                                   (870)                 (6,047)                 (5,925)                (15,386)
    Non-controlling interests in
     (earnings) losses of consolidated
     subsidiaries                                   1,317                   2,022                   4,506                   6,021
    Identifiable assets (1)                       108,998                 127,392                 108,998                 127,392
    Capital expenditures                            3,774                   1,751                   5,145                   3,016
    Depreciation and amortization                   2,249                   3,058                   6,412                   5,530

SATELLITE SERVICES:
    Revenues                                  $     4,268             $       139             $    11,705                     462
    Operating loss                                 (3,215)                   (945)                (14,501)                 (3,365)
    Equity in earnings (losses) of                (37,550)                (11,747)                (87,287)                (43,796)
     affiliates
    Non-controlling interests in
     (earnings) losses of consolidated
     subsidiaries                                     406                     436                   2,970                   1,552
    Identifiable assets (1)                       209,572                 212,135                 209,572                 212,135
    Capital expenditures                               72                      51                   3,643                     492
    Depreciation and amortization                     567                      --                   1,692                      --

CONSOLIDATED:
    Revenues                                  $   248,914             $   187,688             $   685,538             $   558,363
    Operating income                               11,182                   9,292                  27,322                  30,908
    Equity in earnings (losses) of                (37,550)                (11,747)                (87,287)                (43,796)
     affiliates
    Non-controlling interests in
     (earnings) losses of consolidated
     subsidiaries                                   1,723                   2,458                   7,476                   7,573
    Identifiable assets (1)                     1,122,320                 933,345               1,122,320                 933,345
    Capital expenditures                           15,799                  12,528                  47,158                  33,525
    Depreciation and amortization                  13,562                   8,497                  36,302                  27,300
                                              -----------             -----------             -----------             -----------

(1)  Identifiable assets are as of September 30, 1999 and December 31, 1998.
</TABLE>

                                       10
<PAGE>   11

(6)      BUSINESS COMBINATIONS AND INVESTMENTS IN AND ADVANCES TO AFFILIATES

During the second quarter of 1999, the company through its wholly owned
subsidiary, Orbital Navigation Corporation, and The Hertz Corporation ("Hertz")
formed a joint venture, Navigation Solutions, L.L.C. ("NavSolutions"). The
company, through its Magellan subsidiary, sells automotive navigation systems to
NavSolutions, which in turn collects a fee for the use of these systems from
Hertz. The company had contributed $13,800,000 as of September 30, 1999, for a
60% noncontrolling interest in the venture. Accordingly, the company currently
accounts for this investment using the equity method of accounting. Since
September 30, 1999, the company has contributed an additional $3,200,000 to the
venture. Under the terms of the joint venture agreement, the company is
committed to contribute up to an aggregate of $30,000,000, with the remainder
(approximately $13,000,000) to be contributed through mid-2000.

In May 1999, the company acquired all the assets and certain liabilities of the
space robotics division of Toronto-based Spar Aerospace Limited ("Robotics") for
approximately $43,000,000. The company paid half of the purchase price in cash
at closing and issued an unsecured 8% note, due May 2000, for the remainder. The
company has accounted for the acquisition using the purchase method of
accounting. The liabilities recorded exceeded the tangible and intangible assets
acquired resulting in goodwill of approximately $48,000,000. The company has
engaged an appraiser to conduct a valuation of Robotics' assets and liabilities
to assist in the allocation of the purchase price to the tangible and intangible
assets and liabilities. Orbital anticipates that the final purchase accounting
adjustments will be recorded in the fourth quarter of 1999.

Also in May 1999, the company entered into a $37,000,000 long-term license
agreement with the British Columbia provincial government whereby the company
obtained the exclusive rights to use certain government information databases
(the "License Agreement"). The company intends to provide Internet-based
services pursuant to the License Agreement. The company paid approximately
$13,000,000 in cash and borrowed approximately $24,000,000 to acquire the
license. The cost of this license is being amortized over ten years.


                                       11
<PAGE>   12
The company made cash capital contributions to ORBCOMM Global, L.P. totaling
$41,500,000 during the first nine months of 1999. Additionally, the company has
deferred invoicing $17,757,000 during the first nine months of 1999 for work
performed under two satellite and launch procurement contracts. An affiliate of
Teleglobe Inc. has advanced cash to Orbital for approximately half of the
deferred invoicing.

Orbital has an equity investment in CCI, a development stage company formed to
offer satellite-based voice communications services, which has continued to
incur start-up losses. Two other start-up companies that have also been
developing similar satellite telecommunications systems recently announced that
they are experiencing significant financial difficulties and have filed for
bankruptcy protection. CCI needs a significant infusion of capital to complete
its contemplated constellation of satellites. Orbital believes that CCI's
ability to raise the needed capital in the current financial environment is
doubtful and, accordingly, Orbital has concluded that its investment in CCI is
impaired. The company recorded a one-time non-cash charge of $19,744,000 during
the quarter for its remaining investment in CCI. This charge is included in
equity in earnings (losses) of affiliates in the accompanying statement of
earnings.

(7)      INCOME TAXES

The company has recorded its interim income tax provision (for U.S. Federal and
state taxes and foreign taxes) based on an estimate of its full-year provision.
Estimated provisions recorded during interim periods may be periodically
revised, if necessary, to reflect current estimates.

(8)      EARNINGS PER SHARE

Net income (loss) per common share is calculated using the weighted average
number of common shares outstanding during the periods. Net income (loss) per
common share, assuming dilution, is calculated using the weighted average number
of common and common equivalent shares outstanding during the periods, plus the
effects of an assumed conversion of the company's convertible notes, after
giving effect to all net income adjustments that would result from the assumed
conversion.

In periods of net loss, the assumed conversion of convertible notes and stock
options is anti-dilutive. Accordingly, fully diluted per-share losses are the
same as basic losses per share disclosed on the accompanying statements of
earnings. For the three and nine months ended September 30, 1999, adjusted
shares, assuming conversion of convertible notes and the dilutive impact of
outstanding stock options, would have been 41,569,899 and 41,749,105,
respectively. For the three and nine months ended September 30, 1998, adjusted
shares, assuming conversion of convertible notes and the dilutive impact of
outstanding stock options, would have been 41,172,222 and 39,925,234,
respectively.

                                       12
<PAGE>   13
(9)  COMPREHENSIVE INCOME (LOSS)

Comprehensive income (loss) and associated differences are as follows:

<TABLE>
<CAPTION>
                                                 THREE MONTHS ENDED                         NINE MONTHS ENDED
                                                      SEPTEMBER 30,                            SEPTEMBER 30,
                 (In thousands)                1999                 1998                 1999                 1998
                                             --------             --------             --------             --------
                                                                 (Restated)                                (Restated)
<S>                                          <C>                  <C>                  <C>                  <C>
Differences between net income (loss), as
  reported, and comprehensive income
  (loss):
Net loss, as reported                         $(32,649)            $ (1,490)            $(71,507)            $(12,191)
Unrealized gains (losses) on
  short-term investments                            --                  251                   --                  115
Translation adjustments                            (59)                (676)               1,106               (1,191)
                                              --------             --------             --------             --------
      Comprehensive income (loss)             $(32,708)            $ (1,915)            $(70,401)            $(13,267)
                                              ========             ========             ========             ========

Accumulated differences between
  net income (loss), as reported,
  and comprehensive income (loss):
Beginning of period                           $ (6,060)            $ (5,322)            $ (7,225)            $ (4,671)
Unrealized gains (losses) on
  short-term investments                            --                  251                   --                  115
Translation adjustments                            (59)                (676)               1,106               (1,191)
                                              --------             --------             --------             --------
      End of period                           $ (6,119)            $ (5,747)            $ (6,119)            $ (5,747)
                                              ========             ========             ========             ========
</TABLE>

(10)     COMMITMENTS, CONTINGENCIES AND SUBSEQUENT EVENTS

In March 1999, the company signed an agreement to purchase Lowrance Electronics,
Inc. ("Lowrance"), a leading manufacturer of marine and recreational electronics
using GPS-satellite navigation and sonar technology. The merger agreement
originally called for an exchange of Orbital common stock for the outstanding
shares of Lowrance, but was amended in September 1999 to require a cash payment
of approximately $27,000,000 in exchange for the Lowrance shares. The
acquisition has been approved by Lowrance's shareholders, but the closing is
subject to the consent of Orbital's primary lenders, who have conditioned their
consent on Orbital raising additional equity. If such lender consent is not
obtained by December 23, 1999, the merger agreement will terminate unless
extended by mutual agreement.

During the first quarter of 1999, a number of class action lawsuits were filed
in the U.S. District Court for the Eastern District of Virginia (the "District
Court") against the company, an officer and an officer/director alleging
violations of the federal securities laws, on behalf of purchasers of the
company's stock during the period from April 21, 1998 through February 16, 1999,
and seeking monetary damages. On May 21,1999, the cases were consolidated into a
single class action and, on May 28, 1999, an amended consolidated class action
complaint was filed with the District Court. An additional class action
complaint was filed on behalf of purchasers of call options on July 1,
1999, which

                                       13
<PAGE>   14
action was consolidated with the previous action. The District Court also denied
the company's motion to dismiss and granted the plaintiff's motion for class
certification.

In connection with the company's recent announcement of the restatement of its
financial statements for fiscal years 1997, 1998 and the first two quarters of
1999, a class action lawsuit was filed in the District Court on November 10,
1999 against the company, an officer and an officer/director alleging violations
of the federal securities laws, on behalf of purchasers of the company's stock
and call options during the period from April 22, 1997 through October 29, 1999.
On November 19, 1999, the District Court granted the plaintiffs leave to file an
amended complaint consolidating the new action with the previously consolidated
pending cases. While the amounts to be claimed may be substantial, the company
believes that the allegations are without merit and intends to defend vigorously
against such allegations.

In October 1999, Orbital entered into a stock purchase agreement with ORBIMAGE
pursuant to which Orbital has agreed to purchase up to 2,500,000 shares of
ORBIMAGE's common stock for up to $25,000,000. This investment may be made over
time in $5,000,000 minimum increments when ORBIMAGE's cash balance falls below
$10,000,000. Orbital is required to obtain the consent of one of its lenders in
order to make this investment.


                                       14
<PAGE>   15
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF
         FINANCIAL CONDITION AND RESULTS OF OPERATIONS


OVERVIEW

As described in Note 2 to the accompanying financial statements, as a result of
questions raised by our current auditors and in light of notification from our
previous auditors that they have changed their position with respect to certain
issues, management has determined to restate its financial statements for the
fiscal years ended December 31, 1997 and 1998, for the last three quarters of
1997, for all four quarters of 1998 and the first two quarters of 1999. This
restatement relates to the accounting treatment with respect to Orbital's
investments in Orbital Imaging Corporation ("ORBIMAGE") and CCI International,
N.V. ("CCI"). In addition, there are several pending matters relating to our
historical audited and unaudited financial statements that are still under
discussion between our current and previous auditors. Accordingly, the
financial information contained in this discussion is preliminary. This
preliminary financial information reflects our determination of the effects of
presently known adjustments as discussed in Note 2 to the accompanying
financial statements. The resolution of the pending matters could result in
further adjustments to the financial statements for any or all the periods
presented in this report on Form 10-Q. We are seeking to resolve these matters
as expeditiously as possible. Once the outstanding issues are resolved, we plan
to publish revised financial data. Neither our current nor our former auditors
has reviewed or approved the preliminary results reported herein.

Certain statements included in this discussion relating to future revenues,
expenses, growth rates, net income, preliminary results, liquidity, new
business, operational performance schedules, sources and uses of funds, "Year
2000" issues, the outcome of pending litigation and the performance of our
affiliates, ORBIMAGE, ORBCOMM Global L.P. ("ORBCOMM"), Navigation Solutions,
L.L.C. ("NavSolutions") and CCI, are forward-looking statements that involve
known and unknown risks, uncertainties and other factors that may cause actual
results, performance, achievements or investments of Orbital to differ
materially from any future results, performance, achievements, or investments
expressed or implied by such forward-looking statements. Such factors include
general economic and business conditions, launch results, product performance,
risks associated with government contracts, market acceptance of consumer and
industrial products, the introduction of products and services by competitors,
risks associated with acquired businesses, the availability of required capital,
our ability and the ability of our customers and suppliers to assess and correct
timely and accurately "Year 2000" issues, market acceptance of new products and
technologies, risks associated with long-term contracts, the effects of pending
or possible litigation or government investigations, the outcome of discussions
between our current and former auditors and other factors more fully described
in "Management's Discussion and Analysis of Financial Condition and Results of
Operations - Outlook: Issues and Uncertainties" included in our Annual Report on
Form 10-K for the year ended December 31, 1998.

                                       15
<PAGE>   16
RESULTS OF OPERATIONS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 1999
AND 1998

Our products and services are grouped into three business sectors: space and
ground infrastructure systems, satellite access products and satellite services.
Space and ground infrastructure systems include launch vehicles, satellites and
related space systems, electronics and sensor systems and transportation
management systems, and satellite ground systems, software, mapping and land
information services. Our satellite access products sector consists of
satellite-based navigation, positioning and communications products. The
satellite services sector includes satellite-based mobile data communications
services, satellite-based remote imaging services, satellite-based automotive
information services and satellite-based voice communications services. This
sector includes our share of the income or losses of our unconsolidated
affiliates, ORBCOMM, ORBIMAGE, NavSolutions and CCI.

As noted above, the results of operations presented herein for the 1999 and 1998
periods are preliminary.

REVENUES. Our consolidated revenues for the quarter ended September 30, 1999
were $248,914,000 as compared to $187,688,000 for the same quarter last year.
Consolidated revenues for the nine-month periods ended September 30, 1999 and
1998 were $685,538,000 and $558,363,000, respectively.

Space and Ground Infrastructure Systems. Revenues from our space and ground
infrastructure systems sector totaled $200,067,000 and $164,512,000 for the
three months ended September 30, 1999 and 1998, respectively. Revenues from this
sector totaled $570,671,000 and $483,308,000 for the nine months ended September
30, 1999 and 1998, respectively.

Revenues from launch vehicles increased to $37,492,000 for the third quarter of
1999 from $34,636,000 in the third quarter of 1998. Year-to-date revenues were
$117,798,000 as compared to $128,063,000 for the same period last year. The
year-to-date decrease is primarily attributable to launch delays caused by late
delivery of customer satellites and payloads, while the quarter-to-quarter
increase is due to increased activity on certain contracts.

Satellite and related space systems revenues increased to $92,438,000 for the
quarter ended September 30, 1999, as compared to $75,529,000 for the third
quarter of 1998. Year-to-date revenues increased to $246,612,000 as compared to
$194,112,000 for the same period last year. As discussed in Note 6 to the
accompanying financial statements, in May 1999, we acquired the space robotics
division of Spar Aerospace Limited ("Robotics"). Robotics' revenues, which are
now consolidated in our financial statements, were approximately $19,917,000 and
$33,655,000, respectively, for the three- and nine-month periods ended September
30, 1999. The remaining increase in 1999

                                       16
<PAGE>   17
satellite and related space systems revenues is due, in part, to revenues
realized from a new commercial geosynchronous satellite contract received in
late 1998.

Revenues from electronics and sensor systems and transportation management
systems, increased to $34,557,000 for the quarter ended September 30, 1999 from
$29,641,000 for the quarter ended September 30, 1998. Year-to-date revenues
increased to $107,174,000 from $93,207,000 for the first three quarters of 1998.
The increase in revenues this year is primarily due to new contract awards in
early 1999 as well as an increase in transportation management systems revenues.
The increase in transportation management systems revenues is partly
attributable to our December 1998 acquisition of Raytheon Company's
transportation management systems business.

Revenues from our satellite ground systems, software, mapping and land
information services were $35,580,000 for the quarter ended September 30, 1999,
as compared to $24,706,000 for the same quarter last year, and $99,087,000 for
the nine months ended September 30, 1999, as compared to $67,926,000 for the
same period last year. These increases are primarily attributable to revenues
recognized on work performed on orders received in 1998 for a new remote imaging
system and other satellite ground systems and system upgrades as well as
increased revenues from mapping and land information services.

Space and ground infrastructure revenues included sales to our noncontrolled and
unconsolidated affiliates totaling $34,809,000 and $24,798,000 for the quarters
ended September 30, 1999 and 1998, respectively, and $93,742,000 and $95,518,000
for the nine months ended September 30, 1999 and 1998, respectively.

Satellite Access Products. Revenues from sales of satellite-based navigation,
positioning and communications products increased to $44,579,000 for the quarter
ended September 30, 1999 from $23,037,000 for last year's third quarter.
Satellite access products revenues were $103,162,000 for the first three
quarters of 1999 as compared to $74,593,000 for the same period last year. The
increase is largely due to sales of $19,461,000 in the third quarter of 1999 to
NavSolutions discussed in Note 6 to the accompanying financial statements.

Satellite Services. Revenues for this sector totaled $4,268,000 and $139,000 for
the third quarters of 1999 and 1998, respectively, and $11,705,000 and $462,000
for the first three quarters of 1999 and 1998, respectively. The increase in
revenues this year is primarily attributable to the acquisition of a controlling
interest in Radarsat International ("RSI") in the first quarter of 1999.

GROSS MARGINS. Gross profit margin depends on a number of factors, including the
mix of contract types and costs incurred thereon in relation to revenues
recognized. Costs of goods sold include the costs of personnel, materials,
subcontracts and overhead related to sales of commercial products and to costs
incurred under various development and production contracts. Our consolidated
gross margin for the third quarter of 1999 was $54,727,000 as compared to
$46,493,000 in the third quarter of 1998, and $155,870,000

                                       17
<PAGE>   18
for the first nine months of 1999 as compared to $148,718,000 for the first nine
months of 1998. Consolidated gross profit margins as a percentage of revenues
were approximately 22% and 25%, respectively, for the quarters ended September
30, 1999 and 1998, and 23% and 27%, respectively, for the nine-month periods
ended September 30, 1999 and 1998.

Space and Ground Infrastructure Systems. Gross margins from our space and ground
infrastructure systems sector were $43,143,000 (or 22% of sector revenues) and
$39,672,000 (or 24% of sector revenues) for the quarters ended September 30,
1999 and 1998, respectively. Gross margins for this sector were $124,194,000 (or
22% of sector revenues) and $124,363,000 (or 26% of sector revenues) for the
nine months ended September 30, 1999 and 1998, respectively. Gross margins
percentages by product lines were as follows:

<TABLE>
<CAPTION>
                                                  Three Months Ended             Nine Months Ended
                                                    September 30,                  September 30,
                                                 1999           1998            1999           1998
                                                 ----           ----            ----           ----
<S>                                               <C>            <C>            <C>            <C>
     Launch vehicles                              28%            24%            24%            25%
     Satellites and related space
     systems                                      18%            27%            20%            27%
     Electronics and sensor systems
     and transportation management
     systems                                      27%            30%            26%            26%
     Ground systems, software, mapping
     and land information services                19%            10%            20%            21%
</TABLE>

The increase in launch vehicle gross margins in third quarter of 1999 as
compared to the same quarter last year is primarily due to increased profits on
certain existing contracts. Year-to-date margins declined slightly primarily due
to launch delays caused by late deliveries of customer satellites and payloads
and to completing work on certain less profitable contracts.

The decrease in gross margins for satellites and related space systems for both
the quarter and year-to-date periods is due to work performed on a large
commercial geosynchronous satellite contract won in late 1998, which contains a
significant amount of lower-margin, external subcontract effort, and from lower
margins for work performed on certain contracts.

Gross margins for electronics and sensor systems and transportation management
systems declined in the third quarter as compared to the same quarter last year,
although margins were the same for the year-to-date periods. The decline in
margins in the third quarter is due to reduced profitability on certain
transportation management systems contracts.

Gross margins for ground systems, software, mapping and land information
services nearly doubled in the third quarter of this year as compared to the
same quarter last year due to low gross margins in 1998 on less profitable
contracts completed during that period. Year-to-date margins declined slightly
due to lower margins from sales pursuant

                                       18
<PAGE>   19
to a British Columbia government license agreement (discussed in Note 6 to the
accompanying financial statements) and an increase in the amount of lower
margin, subcontract work on several ground systems contracts.

Satellite Access Products. Gross margins percentages for satellite access
products were 25% and 33%, respectively, for the quarters ended September 30,
1999 and 1998, and 30% and 37%, respectively, for the nine months ended
September 30, 1999 and 1998. The decrease in gross margins in 1999 is primarily
due to the increase in sales of lower margin automotive navigation products to
NavSolutions as discussed in Note 6 to the accompanying financial statements.

Satellite Services. This sector had gross margins (losses) of $560,000 and
($898,000) during the third quarters of 1999 and 1998, respectively, and
$573,000 and ($3,193,000) during the first nine months of 1999 and 1998,
respectively. The improvement in 1999 gross margins is primarily attributable to
consolidation of RSI operations in 1999 as discussed above.

RESEARCH AND DEVELOPMENT EXPENSES. Research and development expenses represent
Orbital's self-funded product development activities, and exclude direct
customer-funded development. Research and development expenses for the quarters
ended September 30, 1999 and 1998 were $9,109,000 (or 4% of revenues) and
$14,239,000 (or 8% of revenues), respectively. Research and development expenses
were $29,227,000 (or 4% of revenues) and $34,255,000 (or 6% of revenues) for the
first three quarters of 1999 and 1998, respectively. Research and development
expenses relate primarily to the development of new or improved satellite access
products, improved launch vehicles and new satellite initiatives.

SELLING, GENERAL AND ADMINISTRATIVE EXPENSES. Selling, general and
administrative expenses include the costs of marketing, advertising, promotional
and other selling expenses as well as the costs of the finance, legal,
administrative and general management functions of the company. Selling, general
and administrative expenses for the quarter ended September 30, 1999 and 1998
were $30,593,000 (or 12% of revenues) and $20,979,000 (or 11% of revenues),
respectively. Selling, general and administrative expenses for the nine months
ended September 30, 1999 and 1998 were $89,389,000 (or 13% of revenues) and
$77,634,000 (or 14% of revenues), respectively.

NET INVESTMENT INCOME (EXPENSE). Net investment income (expense) was
($5,722,000) and ($668,000) for the three months ended September 30, 1999 and
1998, respectively. Net investment income (expense) was ($13,410,000) and
($3,745,000) for the nine months ended September 30, 1999 and 1998,
respectively. Net investment income (expense) includes interest earnings on
short-term investments and realized gains and losses on investments, net of
interest expense. Interest expense, net of interest capitalized, was $7,036,000
and $1,669,000 for the third quarters of 1999 and 1998, respectively, and
$16,161,000 and $6,620,000 for the first three quarters of 1999 and 1998,
respectively. Capitalized interest was $761,000 and $2,507,000 for the third
quarters of 1999 and 1998,

                                       19
<PAGE>   20
respectively, and $2,795,000 and $7,565,000 for the first nine months of 1999
and 1998, respectively.

EQUITY IN EARNINGS (LOSSES) OF AFFILIATES. Equity in earnings (losses) of
affiliates was($37,550,000) and ($11,747,000) for the three months ended
September 30, 1999 and 1998, respectively, and was ($87,287,000) and
($43,796,000) for the nine months ended September 30, 1999 and 1998,
respectively. These amounts primarily include our proportionate share of the
current period earnings and losses of our unconsolidated affiliates (ORBCOMM,
ORBIMAGE, CCI and NavSolutions) and the elimination of our proportionate share
of profits or losses, when appropriate, on sales to these affiliates.
Additionally, the third quarter of 1999 included a one-time non-cash charge of
$19,744,000 to write off our investment in CCI as discussed in Note 6 to the
accompanying financial statements. In addition to this write-off, equity losses
increased in 1999 as compared to 1998, primarily due to an increase in ORBCOMM's
losses. ORBCOMM's losses increased due to (i) higher general and administrative
expenses relating to the rollout of global commercial services, (ii) increased
interest expense and (iii) increased system depreciation expense. ORBCOMM
stopped capitalizing interest and began depreciating its full satellite
constellation in the fourth quarter of 1998. We expect equity in losses of
affiliates in the remainder of 1999 to continue to be significantly higher than
last year, primarily due to increased losses at ORBCOMM.

NON-CONTROLLING INTERESTS IN (EARNINGS) LOSSES OF CONSOLIDATED SUBSIDIARIES.
Non-controlling interests in (earnings) losses of consolidated subsidiaries were
$1,723,000 and $2,458,000 for the three months ended September 30, 1999 and
1998, respectively, and $7,476,000 and $7,573,000 for the nine months ended
September 30, 1999 and 1998, respectively. These amounts represent the
non-controlling stockholders' proportionate share of ORBCOMM USA's and
Magellan's's current period earnings and losses.

PROVISION FOR INCOME TAXES. We recorded an income tax provision of $2,282,000
and $826,000 for the three months ended September 30, 1999 and 1998,
respectively, and $5,608,000 and $3,131,000 for the nine months ended September
30, 1999 and 1998, respectively. The provision in both periods was entirely due
to foreign taxes attributable to our Canadian operations. Our interim income tax
provision is based on an estimate of our full-year provision. Estimated
provisions recorded during interim periods may be periodically revised, if
necessary, to reflect current estimates of the full year provision.

NET INCOME (LOSS). Our consolidated net income (loss) for the third quarter of
1999 and 1998 was ($32,649,000) and ($1,491,000), respectively, and
($71,507,000) and ($12,191,000) for the first three quarters of 1999 and 1998,
respectively.

LIQUIDITY AND CAPITAL RESOURCES

Our growth has required, and continues to require, substantial capital to fund
investments in affiliates, business acquisitions, expanding working capital
needs, new business initiatives, research and development and capital
expenditures. We have funded these

                                       20
<PAGE>   21
requirements to date through cash generated by operations, working capital, loan
facilities, asset-based financings, joint venture arrangements and private and
public equity and debt offerings. As described below, our liquidity is currently
constrained primarily as a result of the pending restatement of our financial
statements. (See Notes 1 and 2 to the accompanying financial statements). While
we believe that cash from operations and available resources are sufficient to
fund our core operations through the early part of 2000, to satisfy our capital
requirements beyond such core operations we need to raise additional equity
and/or debt capital. We are pursuing these alternatives, but no assurance can be
given that we will be successful in completing any new equity or debt
financings. We are also examining our existing commitments to affiliates and, in
particular, are exploring alternative methods to provide additional funds to
ORBCOMM as described below. Our inability to raise additional capital may have a
material adverse effect on our business.

Cash and investments were $39,240,000 and total debt obligations were
$369,537,000 at September 30, 1999. The outstanding debt is comprised primarily
of our $100,000,000 5% convertible subordinated notes, advances under several
revolving credit facilities, secured and unsecured notes, and asset-based
financings. Cash and investments at September 30, 1999 included approximately
$18,174,000 restricted against outstanding letters of credit. Our current ratio
was 1.1 and 1.2 at September 30, 1999 and December 31, 1998, respectively. Our
debt-to-equity ratio was approximately 90% at September 30, 1999 as compared to
44% at December 31, 1998.

Our primary revolving credit facility provides for total borrowings from a
syndicate of banks of up to $200,000,000. Borrowings of $164,000,000 were
outstanding under the facility at September 30, 1999 at a weighted average
interest rate of 7.4% and are secured by accounts receivable. Borrowings of
approximately $187,000,000 are currently outstanding. The facility prohibits the
payment of cash dividends, contains certain covenants with respect to our
working capital levels, fixed charges ratio, leverage ratio and net worth, and
expires in December 2002. We also issued $45,200,000 of new debt in the first
nine months of 1999 related to various business acquisitions. (See Note 6 to the
accompanying financial statements.)

In October, we amended our $200,000,000 primary revolving credit facility in
order to receive full availability under the facility. The amendment provides
for the resetting of, and waivers to covenants with respect to net worth,
leverage and fixed charges ratios. The waivers expire on December 30, 1999.
In exchange for the amendment, we and certain of our subsidiaries are obligated
to deliver additional collateral to our syndicate of banks on or before
November 30, 1999. The additional collateral currently consists primarily of
all intellectual property, all general intangibles, all financial instruments
and all stock of certain subsidiaries, not including Magellan. As a result of
our announcement in late October that previously audited and unaudited
financial results would need to be restated, we are currently unable to borrow
additional amounts under the bank facility. We have advised our bank group
that, based on the preliminary results through September 30, 1999, we believe
we no longer comply with the minimum consolidated net worth covenant and a
permitted investment

                                       21
<PAGE>   22
covenant that is tied to net worth, and that adjustments to such covenants will
be necessary. There can be no assurance that our syndicate of banks will agree
either to adjust the covenants or to waive the defaults. Our inability to
resolve these defaults with the banks could have a material adverse effect on
our business.

During the first nine months of 1999, we provided $41,500,000 in capital to
ORBCOMM. In addition, during this time frame, we deferred invoicing ORBCOMM for
approximately $17,800,000 of work performed under our ORBCOMM satellite and
launch procurement agreement and anticipate deferring additional invoicing
during the remainder of 1999. Approximately one-half of the deferred invoice
amounts has been, and is expected to continue to be, advanced to Orbital by
Teleglobe Inc. ORBCOMM will require additional funding and Orbital and Telegobe
are currently analyzing different capital raising and partner funding
alternatives.

In addition to our investment in ORBCOMM, for the nine months ended September
30, 1999, we invested approximately $13,800,000 in NavSolutions, $40,380,000 in
business and other asset acquisitions and $47,158,000 in capital expenditures
for various satellite, launch vehicle and other infrastructure production,
manufacturing and test equipment, leasehold improvements and office equipment.
Our operations provided net cash of approximately $53,288,000 during the first
nine months of 1999.

We are expanding our offices and satellite-related engineering, manufacturing
and operations facilities adjacent to our Dulles, Virginia headquarters in order
to consolidate certain operational facilities and office space and provide for
future growth. Construction has commenced and is expected to continue into 2001.
To finance the majority of this expansion, we have negotiated a built-to-suit
agreement with a developer for the office expansion. We are actively pursuing
third-party financing for the engineering, manufacturing and operating
facilities.

YEAR 2000 ISSUES

Orbital and its operating companies have been engaged in a comprehensive plan to
prepare for potential "Year 2000" issues with respect to various operational,
technical and financial computer-related systems. The plan was designed to
minimize risk to the company and its customers using a standard industry
five-phase approach, including awareness, assessment, renovation, validation and
implementation, which we have essentially completed.

Activities through September 30, 1999 included renovating, validating and
implementing our corrective action plan by reprogramming affected hardware and
software when appropriate and feasible, obtaining vendor-provided software
upgrades when available and completely replacing affected systems when
necessary. Actions in the last quarter of the year will include further testing
and validation and ensuring Year 2000 compliance of newly introduced system
changes.

                                       22
<PAGE>   23
The total costs to implement our comprehensive plan, which include the
previously planned replacement of existing systems to support our overall
growth, are estimated to be less than 1% of 1998 revenues. More than 85% of
the estimated costs to implement our plan has been incurred so far with the
remaining costs expected to be incurred during the remainder of 1999. All costs,
including the costs of internal personnel, outside consultants, system
replacements and other equipment, will be expensed as incurred, except for the
purchase of long-lived assets, which will be capitalized in accordance with our
capitalization policies. We have not postponed the implementation or upgrade of
other systems as a result of focusing on the Year 2000 plan.

As part of our plan, we have been surveying our customers, suppliers and other
service providers regarding their Year 2000 readiness. At this point we believe
that any "Year 2000" issues will not negatively impact our significant customers
(including the U.S. government), key suppliers or critical service providers and
consequently, will not materially impact the company's cash flows or operating
results. We will continue to monitor the status of our customers and suppliers
through the remainder of the year.

A "reasonably likely worst case" scenario of the Year 2000 issue for us could
include isolated performance problems with engineering, financial and
administrative systems; isolated interruption of deliveries from suppliers;
product liability or warranty issues; and the temporary inability of key
customers to pay amounts due us. Contingency plans are being finalized, and will
be implemented if necessary, including the identification of alternative
suppliers for critical components. There can be no assurance that we have
identified, or will identify, all "Year 2000" affected systems, suppliers,
customers and service providers, or that our corrective action plan will be
timely and successful.

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The company does not have any material exposure to interest rate changes,
commodity price changes, foreign currency fluctuation, or similar market risks,
although we do enter into forward exchange contracts to hedge against specific
foreign currency fluctuations, principally with respect to the Canadian dollar
and Japanese yen. At September 30, 1999, the majority of the company's long-term
debt consisted of its $100,000,000, 5% convertible subordinated notes, due 2002.
The fair market value of these convertible securities fluctuates with the
company's stock price, and was $111,000,000 at September 30, 1999.

                                       23
<PAGE>   24
PART II

OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

                  During the first quarter of 1999, a number of class action
                  lawsuits were filed in the U.S. District Court for the Eastern
                  District of Virginia (the "District Court") against the
                  company, an officer and an officer/director alleging
                  violations of the federal securities laws, on behalf of
                  purchasers of the company's stock during the period from April
                  21, 1998 through February 16, 1999, and seeking monetary
                  damages. On May 21,1999, the cases were consolidated into a
                  single class action and, on May 28, 1999, an amended
                  consolidated class action complaint was filed with the
                  District Court. An additional class action complaint was filed
                  on behalf of purchasers of call options on July 1, 1999. The
                  District Court consolidated that case with the previous action
                  on July 30, 1999. The District Court also denied the company's
                  motion to dismiss and granted the plaintiff's motion for class
                  certification. In connection with the company's recent
                  announcement of the restatement of its financial reports for
                  fiscal years 1997, 1998 and the first two quarters of 1999, a
                  class action lawsuit was filed in the District Court on
                  November 10, 1999 against the company, an officer and an
                  officer/director alleging violations of the federal securities
                  laws, on behalf of purchasers of the company's stock and call
                  options during the period from April 22, 1997 through October
                  29, 1999. On November 19, 1999, the District Court granted the
                  plaintiffs leave to file an amended complaint consolidating
                  the new action with the previously consolidated pending cases.
                  While the amounts to be claimed may be substantial, the
                  company believes that the allegations are without merit and
                  intends to defend vigorously against such allegations.

                                       24
<PAGE>   25
                  As previously reported in the company's Report on Form 10-K
                  for the fiscal year ended December 31, 1998, Thomas van der
                  Heyden filed a lawsuit in December 1998 in the Circuit Court
                  for Montgomery County, Maryland alleging that the company is
                  in actual or anticipatory breach of obligations allegedly
                  imposed on it in a judgment confirming an award granted in an
                  arbitration between van der Heyden and CTA. The plaintiff
                  claims that he is entitled to a sum exceeding $30 million from
                  the company, as successor-in-interest to CTA. The company
                  removed this action to United States District Court for the
                  District of Maryland. In response to a motion by the company,
                  the plaintiff agreed to voluntarily dismiss the action and
                  arbitrate his claims. We believe that the allegations are
                  without merit and intend to vigorously defend against the
                  allegations. In addition, under the terms of the CTA
                  acquisition agreement, we believe we may be entitled to
                  indemnification from CTA for all or a part of any damages
                  arising from the van der Heyden arbitration.


ITEM 2.           CHANGES IN SECURITIES

                  Not applicable.

ITEM 3.           DEFAULTS UPON SENIOR SECURITIES

                  As discussed in "Management's Discussion and Analysis of
                  Financial Condition and Results of Operations -- Liquidity
                  and Capital Resources" above, we have advised our bank group
                  that, based on the preliminary results through September 30,
                  1999, we believe we no longer comply with the minimum
                  consolidated net worth covenant and a permitted investment
                  covenant that is tied to net worth, and that adjustments to
                  such covenants will be necessary.

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

                  Not applicable

ITEM 5.           OTHER INFORMATION

                  Not applicable.

                                       25
<PAGE>   26
ITEM 6.           EXHIBITS AND REPORTS ON FORM 8-K

                  (a)      Exhibits - A complete listing of exhibits required is
                           given in the Exhibit Index that precedes the exhibits
                           filed with this report.

                  (b)      Reports on Form 8-K.

                           (i) On July 28, 1999, the company filed a Current
                           Report on Form 8-K, dated July 28, 1999, disclosing
                           its financial results for the quarter ended June 30,
                           1999.


                                       26
<PAGE>   27
                                   SIGNATURES

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

                              ORBITAL SCIENCES CORPORATION


DATED:  November 22, 1999     By:  /s/ David W. Thompson
                                   ---------------------------------------------
                                   David W. Thompson, President
                                   and Chief Executive Officer


DATED: November 22, 1999      By:  /s/ Jeffrey V. Pirone
                                   ---------------------------------------------
                                   Jeffrey V. Pirone, Executive Vice President
                                   and Principal Financial Officer

                                       27
<PAGE>   28
                                  EXHIBIT INDEX



The following exhibits are filed as part of this report.

<TABLE>
<CAPTION>
Exhibit No.                  Description
- -----------                  -----------
<S>                          <C>

10.12.3                      Performance Share Agreement between the Company and
                             David W. Thompson, James R. Thompson and Jeffrey V.
                             Pirone dated July 21, 1999 (transmitted herewith).

10.12.4                      Performance Share Agreement between the Company and
                             James R. Thompson dated July 21, 1999 (transmitted
                             herewith).

10.12.5                      Performance Share Agreement between the Company and
                             Jeffrey V. Pirone dated July 21, 1999 (transmitted
                             herewith).

11                           Computation of Earnings Per Share

27                           Financial Data Schedule (such schedule is furnished
                             for the information of the Securities and Exchange
                             Commission and is not to be deemed "filed" as part
                             of the Form 10-Q, or otherwise subject to the
                             liabilities of Section 18 of the Securities
                             Exchange Act of 1934) (transmitted herewith).
</TABLE>


<PAGE>   1
                                                                  Exhibit 10.2.3


                           PERFORMANCE SHARE AGREEMENT


         This Performance Share Agreement (the "Agreement") is made as of the
21st day of July, 1999 by and between Orbital Sciences Corporation, a Delaware
corporation (the "Company"), and David W. Thompson, the President and Chief
Executive Officer of the Company (the "Executive").

         WHEREAS, the Human Resources and Nominating Committee of the Board of
Directors of the Company (the "Committee") has determined that it is desirable
and in the best interests of the Company to grant to the Executive the right to
receive performance share units (the "Performance Shares"), in order to provide
the Executive with further incentive to enhance the profitability and financial
strength of the Company by linking a component of the Executive's compensation
to Company stock value, which Performance Shares entitle the Executive to
receive an annual bonus measured by the increased value of the Company's common
stock, par value $.01 per share (the "Common Stock").

         NOW THEREFORE, in consideration of the mutual promises and covenants
contained herein, the parties hereby agree as follows:

         1. GRANT OF PERFORMANCE SHARES. The Company hereby grants to the
Executive a total of 100,000 Performance Shares, which shall have the features
set forth below. The date of the grant of the Performance Shares is July 21,
1999, the date on which the grant was approved by the Committee.

                  a.       Vesting. The 100,000 Performance Shares shall vest
                           immediately.

                  b.       Performance Bonus Calculation. Until expiration or
                           termination, each vested Performance Share shall
                           entitle the Executive to receive a bonus (the
                           "Performance Bonus"). The Performance Bonus shall be
                           calculated on each of March 31, 2000 and 2001 with
                           respect to the aggregate number of Performance Shares
                           that have vested as of March 1 of such year. The
                           Performance Bonus shall be equal to the increase, if
                           any, from the Base Price to the Anniversary Valuation
                           Price, as illustrated below for each applicable
                           calendar year.


<TABLE>
<CAPTION>
         NUMBER OF                                                                      ANNIVERSARY
         PERFORMANCE SHARES         BASE DATE                 BASE PRICE                VALUATION PRICE
         ------------------         ---------                 ----------                ---------------
<S>                                 <C>                       <C>                       <C>
         100,000                    July 21, 1999             $30.00                    Fair Market Value
                                                                                        on March 31, 2000
</TABLE>
<PAGE>   2
<TABLE>
<S>                                 <C>                       <C>                       <C>
         100,000                    March 31, 2000            Fair Market Value         Fair Market Value
                                                              on March 31, 2000         on March 31, 2001
</TABLE>
<PAGE>   3
                  c.       Payment of Performance Bonus. The Performance Bonus,
                           if any, shall be paid in cash in the form of a credit
                           to the Executive's account under the Company's 1995
                           Deferred Compensation Plan. Such payment shall be
                           made as soon as practicable after calculation of the
                           Performance Bonus. Fifty percent (50%) of such credit
                           shall vest immediately, with the other Fifty percent
                           (50%) vesting on March 31 of the subsequent year.

                  d.       Expiration. The Performance Shares shall expire on
                           April 1, 2001 unless this Agreement is terminated
                           according to its terms at an earlier time.

                  e.       Fair Market Value. For purposes of this Agreement,
                           the Fair Market Value shall be equal to the average
                           closing sales price of the Common Stock on the
                           national securities exchange on which the Common
                           Stock is then principally traded, calculated for the
                           first 20 trading days in March of the applicable
                           valuation year.

         2. LIMITATION ON TRANSFER. The Performance Shares are not transferable
by the Executive.

         3. PERFORMANCE SHARE ADJUSTMENTS.

                  a.       Changes in Stock. If the outstanding shares of Common
                           Stock of the Company are increased, decreased,
                           changed into or exchanged for a different number or
                           kind of shares of the Company through reorganization,
                           recapitalization, reclassification, stock dividend,
                           stock split or reverse stock split, upon
                           authorization of the Board, a proportionate
                           adjustment shall be made in the number or kind of
                           Common Stock subject to the Performance Shares, so
                           that the proportionate interest of the Executive
                           immediately following such event shall, to the extent
                           practicable, be the same as immediately prior to such
                           event. Any such adjustment to Performance Shares
                           shall include a corresponding proportionate
                           adjustment in the Base Price per share of Common
                           Stock.

                  b.       Reorganization in Which the Company is the Surviving
                           Corporation. Subject to subparagraph (c) below, if
                           the Company shall be the surviving corporation in any
                           reorganization, merger or consolidation of the
                           Company with one or more other corporations, the
                           Performance Shares shall pertain to and apply to the
                           securities to which a holder of the number of shares
                           of Common Stock subject to the Performance Shares
                           would have been entitled immediately following such
                           reorganization, merger or consolidation, with a
                           corresponding proportionate adjustment in the Base
                           Price per share of Common Stock so that the aggregate
                           Base Price thereafter shall be the same as the
                           aggregate Base Price of the Common Stock remaining
                           subject to the Performance Shares immediately prior
                           to such reorganization, merger or consolidation.
<PAGE>   4
                  c.       Reorganization in Which the Company is Not the
                           Surviving Corporation or Sale of Assets or Stock.
                           Upon the dissolution or liquidation of the Company,
                           or upon a merger, consolidation or reorganization of
                           the Company with one or more other corporations in
                           which the Company is not the surviving corporation,
                           or upon a sale of substantially all the assets of the
                           Company to another corporation, or upon any
                           transaction (including, without limitation, a merger
                           or reorganization in which the Company is the
                           surviving corporation) approved by the Board which
                           results in any person or entity owning Eighty percent
                           (80%) or more of the combined voting power of all
                           classes of the stock of the Company, unless provision
                           is made in writing in connection with such
                           transaction for the assumption of this Agreement with
                           such adjustments as the Board deems appropriate with
                           respect to the features, terms and conditions of the
                           Performance Shares, the Performance Shares hereunder
                           shall immediately entitle the Executive to a
                           Performance Bonus in an amount equal to the
                           difference between the applicable Base Price and the
                           Fair Market Value of the per share Common Stock on
                           the trading date immediately preceding the closing
                           date of such Transaction, and any unpaid portion of a
                           previously vested Performance Bonus shall be
                           immediately paid.

                  d.       Adjustments. In all cases, the nature and extent of
                           adjustments under this Section 3 shall be determined
                           by the Committee in its sole discretion, and any such
                           determination as to what adjustments shall be made,
                           and the extent thereof, shall be final and binding.

         4. WITHHOLDING OF TAXES. The parties hereto recognize that the Company
may be obligated to withhold federal, state and local income taxes and Social
Security taxes to the extent that the Executive realizes ordinary income in
connection with receipt of the Performance Bonus pursuant to this Agreement. The
Executive agrees that the Company may withhold amounts needed to cover such
taxes from payments otherwise due and owing to the Executive.

         5. DISCLAIMER OF RIGHTS. No provision in this Agreement shall be
construed to confer upon the Executive the right to be employed by the Company,
or to interfere in any way with the right and authority of the Company either to
increase or decrease the compensation of the Executive at any time, or to
terminate any employment or other relationship between the Executive and the
Company.

         6. INTERPRETATION OF PERFORMANCE SHARE AGREEMENT. All decisions and
interpretations made by the Committee or the Board of Directors of the Company
with regard to any questions arising under this Agreement shall be binding and
conclusive on the Company and the Executive.

         7. TERMINATION. Except as otherwise provided herein, this Agreement
shall terminate and all rights and obligations of the parties hereunder shall be
void and of no effect immediately upon the date the Executive ceases to hold the
same, equivalent or higher grade office as that office set forth in the first
paragraph of this Agreement or March 31, 2002,
<PAGE>   5
whichever occurs first. For purposes of this Agreement, an approved leave of
absence shall not be deemed an event resulting in the Executive ceasing to hold
such office under this Agreement. An approved leave of absence shall mean an
absence approved by the Committee for military leave, sick leave, or other bona
fide leave, as long as the Executive's right to re-employment is guaranteed by
contract, statute or the policy of the Company.

         8. MISCELLANEOUS

                  a.       Title and Headings. Titles and headings of sections
                           of the Agreement are for convenience of reference
                           only and shall not affect the construction of any
                           provision of this Agreement.

                  b.       Governing Law. This Agreement shall be governed by,
                           interpreted under and construed and enforced in
                           accordance with the internal laws, and not the laws
                           pertaining to conflicts or choice of laws, of the
                           State of Delaware.


                  IN WITNESS WHEREOF, the parties have executed this agreement
as of July 21, 1999.



ORBITAL SCIENCES CORPORATION


By:      /s/ Kelly H. Burke                       /s/ David W. Thompson
         ------------------                       ---------------------
             Kelly H. Burke                           David W. Thompson
             Chairman of the Human Resources          President and
             and Nominating Committee                 Chief Executive Officer




<PAGE>   1
                                                                 Exhibit 10.12.4


                           PERFORMANCE SHARE AGREEMENT


         This Performance Share Agreement (the "Agreement") is made as of the
21st day of July, 1999 by and between Orbital Sciences Corporation, a Delaware
corporation (the "Company"), and James R. Thompson, Executive Vice President and
General Manager, Launch Systems Group (the "Executive").

         WHEREAS, the Human Resources and Nominating Committee of the Board of
Directors of the Company (the "Committee") has determined that it is desirable
and in the best interests of the Company to grant to the Executive the right to
receive performance share units (the "Performance Shares"), in order to provide
the Executive with further incentive to enhance the profitability and financial
strength of the Company by linking a component of the Executive's compensation
to Company stock value, which Performance Shares entitle the Executive to
receive an annual bonus measured by the increased value of the Company's common
stock, par value $.01 per share (the "Common Stock").

         NOW THEREFORE, in consideration of the mutual promises and covenants
contained herein, the parties hereby agree as follows:

         1. GRANT OF PERFORMANCE SHARES. The Company hereby grants to the
Executive a total of 50,000 Performance Shares, which shall have the features
set forth below. The date of the grant of the Performance Shares is July 21,
1999, the date on which the grant was approved by the Committee.

                  f.       Vesting. The 50,000 Performance Shares shall vest
                           immediately.

                  g.       Performance Bonus Calculation. Until expiration or
                           termination, each vested Performance Share shall
                           entitle the Executive to receive a bonus (the
                           "Performance Bonus"). The Performance Bonus shall be
                           calculated on each of March 31, 2000 and 2001 with
                           respect to the aggregate number of Performance Shares
                           that have vested as of March 1 of such year. The
                           Performance Bonus shall be equal to the increase, if
                           any, from the Base Price to the Anniversary Valuation
                           Price, as illustrated below for each applicable
                           calendar year.



<TABLE>
<CAPTION>
         NUMBER OF                                                                      ANNIVERSARY
         PERFORMANCE SHARES         BASE DATE                 BASE PRICE                VALUATION PRICE
         ------------------         ---------                 ----------                ---------------
<S>                                 <C>                       <C>                       <C>
         50,000                     July 21, 1999             $30.00                    Fair Market Value
                                                                                        on March 31, 2000
</TABLE>
<PAGE>   2
<TABLE>
<S>                                 <C>                       <C>                       <C>
         50,000                     March 31, 2000            Fair Market Value         Fair Market Value
                                                              on March 31, 2000         on March 31, 2001
</TABLE>
<PAGE>   3
                  h.       Payment of Performance Bonus. The Performance Bonus,
                           if any, shall be paid in cash in the form of a credit
                           to the Executive's account under the Company's 1995
                           Deferred Compensation Plan. Such payment shall be
                           made as soon as practicable after calculation of the
                           Performance Bonus. Fifty percent (50%) of such credit
                           shall vest immediately, with the other Fifty percent
                           (50%) vesting on March 31 of the subsequent year.

                  i.       Expiration. The Performance Shares shall expire on
                           April 1, 2001 unless this Agreement is terminated
                           according to its terms at an earlier time.

                  j.       Fair Market Value. For purposes of this Agreement,
                           the Fair Market Value shall be equal to the average
                           closing sales price of the Common Stock on the
                           national securities exchange on which the Common
                           stock is then principally traded, calculated for the
                           first 20 trading days in March of the applicable
                           valuation year.

         2. LIMITATION ON TRANSFER. The Performance Shares are not transferable
by the Executive.

         9. PERFORMANCE SHARE ADJUSTMENTS.

                  e.       Changes in Stock. If the outstanding shares of Common
                           Stock of the Company are increased, decreased,
                           changed into or exchanged for a different number or
                           kind of shares of the Company through reorganization,
                           recapitalization, reclassification, stock dividend,
                           stock split or reverse stock split, upon
                           authorization of the Board, a proportionate
                           adjustment shall be made in the number or kind of
                           Common Stock subject to the Performance Shares, so
                           that the proportionate interest of the Executive
                           immediately following such event shall, to the extent
                           practicable, be the same as immediately prior to such
                           event. Any such adjustment to Performance Shares
                           shall include a corresponding proportionate
                           adjustment in the Base Price per share of Common
                           Stock.

                  f.       Reorganization in Which the Company is the Surviving
                           Corporation. Subject to subparagraph (c) below, if
                           the Company shall be the surviving corporation in any
                           reorganization, merger or consolidation of the
                           Company with one or more other corporations, the
                           Performance Shares shall pertain to and apply to the
                           securities to which a holder of the number of shares
                           of Common Stock subject to the Performance Shares
                           would have been entitled immediately following such
                           reorganization, merger or consolidation, with a
                           corresponding proportionate adjustment in the Base
                           Price per share of Common Stock so that the aggregate
                           Base Price thereafter shall be the same as the
                           aggregate Base Price of the Common Stock remaining
                           subject to the Performance Shares immediately prior
                           to such reorganization, merger or consolidation.
<PAGE>   4
                  g.       Reorganization in Which the Company is Not the
                           Surviving Corporation or Sale of Assets or Stock.
                           Upon the dissolution or liquidation of the Company,
                           or upon a merger, consolidation or reorganization of
                           the Company with one or more other corporations in
                           which the Company is not the surviving corporation,
                           or upon a sale of substantially all the assets of the
                           Company to another corporation, or upon any
                           transaction (including, without limitation, a merger
                           or reorganization in which the Company is the
                           surviving corporation) approved by the Board which
                           results in any person or entity owning Eighty percent
                           (80%) or more of the combined voting power of all
                           classes of the stock of the Company, unless provision
                           is made in writing in connection with such
                           transaction for the assumption of this Agreement with
                           such adjustments as the Board deems appropriate with
                           respect to the features, terms and conditions of the
                           Performance Shares, the Performance Shares hereunder
                           shall immediately entitle the Executive to a
                           Performance Bonus in an amount equal to the
                           difference between the applicable Base Price and the
                           Fair Market Value of the per share Common Stock on
                           the trading date immediately preceding the closing
                           date of such Transaction, and any unpaid portion of a
                           previously vested Performance Bonus shall be
                           immediately paid.

                  h.       Adjustments. In all cases, the nature and extent of
                           adjustments under this Section 3 shall be determined
                           by the Committee in its sole discretion, and any such
                           determination as to what adjustments shall be made,
                           and the extent thereof, shall be final and binding.

         10. WITHHOLDING OF TAXES. The parties hereto recognize that the Company
may be obligated to withhold federal, state and local income taxes and Social
Security taxes to the extent that the Executive realizes ordinary income in
connection with receipt of the Performance Bonus pursuant to this Agreement. The
Executive agrees that the Company may withhold amounts needed to cover such
taxes from payments otherwise due and owing to the Executive.

         11. DISCLAIMER OF RIGHTS. No provision in this Agreement shall be
construed to confer upon the Executive the right to be employed by the Company,
or to interfere in any way with the right and authority of the Company either to
increase or decrease the compensation of the Executive at any time, or to
terminate any employment or other relationship between the Executive and the
Company.

         12. INTERPRETATION OF PERFORMANCE SHARE AGREEMENT. All decisions and
interpretations made by the Committee or the Board of Directors of the Company
with regard to any questions arising under this Agreement shall be binding and
conclusive on the Company and the Executive.

         13. TERMINATION. Except as otherwise provided herein, this Agreement
shall terminate and all rights and obligations of the parties hereunder shall be
void and of no effect immediately upon the date the Executive ceases to hold the
same, equivalent or higher grade office as that office set forth in the first
paragraph of this Agreement or March 31, 2002,
<PAGE>   5
whichever occurs first. For purposes of this Agreement, an approved leave of
absence shall not be deemed an event resulting in the Executive ceasing to hold
such office under this Agreement. An approved leave of absence shall mean an
absence approved by the Committee for military leave, sick leave, or other bona
fide leave, as long as the Executive's right to re-employment is guaranteed by
contract, statute or the policy of the Company.

         14. MISCELLANEOUS

                  c.       Title and Headings. Titles and headings of sections
                           of the Agreement are for convenience of reference
                           only and shall not affect the construction of any
                           provision of this Agreement.

                  d.       Governing Law. This Agreement shall be governed by,
                           interpreted under and construed and enforced in
                           accordance with the internal laws, and not the laws
                           pertaining to conflicts or choice of laws, of the
                           State of Delaware.


                  IN WITNESS WHEREOF, the parties have executed this agreement
as of July 21, 1999.



ORBITAL SCIENCES CORPORATION


By:      /s/ Kelly H. Burke                     /s/ James R. Thompson
         ------------------                     ---------------------
             Kelly H. Burke                         James R. Thompson
             Chairman of the Human Resources        Executive Vice President and
             and Nominating Committee               General Manager, Launch
                                                    Systems Group

<PAGE>   1
                                                                 Exhibit 10.12.5

                           PERFORMANCE SHARE AGREEMENT


         This Performance Share Agreement (the "Agreement") is made as of the
21st day of July, 1999 by and between Orbital Sciences Corporation, a Delaware
corporation (the "Company"), and Jeffrey V. Pirone, Executive Vice President and
Chief Financial Officer (the "Executive").

         WHEREAS, the Human Resources and Nominating Committee of the Board of
Directors of the Company (the "Committee") has determined that it is desirable
and in the best interests of the Company to grant to the Executive the right to
receive performance share units (the "Performance Shares"), in order to provide
the Executive with further incentive to enhance the profitability and financial
strength of the Company by linking a component of the Executive's compensation
to Company stock value, which Performance Shares entitle the Executive to
receive an annual bonus measured by the increased value of the Company's common
stock, par value $.01 per share (the "Common Stock").

         NOW THEREFORE, in consideration of the mutual promises and covenants
contained herein, the parties hereby agree as follows:

         1. GRANT OF PERFORMANCE SHARES. The Company hereby grants to the
Executive a total of 50,000 Performance Shares, which shall have the features
set forth below. The date of the grant of the Performance Shares is July 21,
1999, the date on which the grant was approved by the Committee.

                  k.       Vesting. The 50,000 Performance Shares shall vest
                           immediately.

                  l.       Performance Bonus Calculation. Until expiration or
                           termination, each vested Performance Share shall
                           entitle the Executive to receive a bonus (the
                           "Performance Bonus"). The Performance Bonus shall be
                           calculated on each of March 31, 2000 and 2001 with
                           respect to the aggregate number of Performance Shares
                           that have vested as of March 1 of such year. The
                           Performance Bonus shall be equal to the increase, if
                           any, from the Base Price to the Anniversary Valuation
                           Price, as illustrated below for each applicable
                           calendar year.



<TABLE>
<CAPTION>
         NUMBER OF                                                                      ANNIVERSARY
         PERFORMANCE SHARES         BASE DATE                 BASE PRICE                VALUATION PRICE
         ------------------         ---------                 ----------                ---------------
<S>                                 <C>                       <C>                       <C>
         50,000                     July 21, 1999             $30.00                    Fair Market Value
                                                                                        on March 31, 2000
         50,000                     March 31, 2000            Fair Market Value         Fair Market Value
</TABLE>
<PAGE>   2
<TABLE>
<S>                                 <C>                       <C>                       <C>
                                                              on March 31, 2000         on March 31, 2001
</TABLE>
<PAGE>   3
                  m.       Payment of Performance Bonus. The Performance Bonus,
                           if any, shall be paid in cash in the form of a credit
                           to the Executive's account under the Company's 1995
                           Deferred Compensation Plan. Such payment shall be
                           made as soon as practicable after calculation of the
                           Performance Bonus. Fifty percent (50%) of such credit
                           shall vest immediately, with the other Fifty percent
                           (50%) vesting on March 31 of the subsequent year.

                  n.       Expiration. The Performance Shares shall expire on
                           April 1, 2001 unless this Agreement is terminated
                           according to its terms at an earlier time.

                  o.       Fair Market Value. For purposes of this Agreement,
                           the Fair Market Value shall be equal to the average
                           closing sales price of the Common Stock on the
                           national securities exchange on which the Common
                           stock is then principally traded, calculated for the
                           first 20 trading days in March of the applicable
                           valuation year.

         2. LIMITATION ON TRANSFER. The Performance Shares are not transferable
by the Executive.

         15. PERFORMANCE SHARE ADJUSTMENTS.

                  i.       Changes in Stock. If the outstanding shares of Common
                           Stock of the Company are increased, decreased,
                           changed into or exchanged for a different number or
                           kind of shares of the Company through reorganization,
                           recapitalization, reclassification, stock dividend,
                           stock split or reverse stock split, upon
                           authorization of the Board, a proportionate
                           adjustment shall be made in the number or kind of
                           Common Stock subject to the Performance Shares, so
                           that the proportionate interest of the Executive
                           immediately following such event shall, to the extent
                           practicable, be the same as immediately prior to such
                           event. Any such adjustment to Performance Shares
                           shall include a corresponding proportionate
                           adjustment in the Base Price per share of Common
                           Stock.

                  j.       Reorganization in Which the Company is the Surviving
                           Corporation. Subject to subparagraph (c) below, if
                           the Company shall be the surviving corporation in any
                           reorganization, merger or consolidation of the
                           Company with one or more other corporations, the
                           Performance Shares shall pertain to and apply to the
                           securities to which a holder of the number of shares
                           of Common Stock subject to the Performance Shares
                           would have been entitled immediately following such
                           reorganization, merger or consolidation, with a
                           corresponding proportionate adjustment in the Base
                           Price per share of Common Stock so that the aggregate
                           Base Price thereafter shall be the same as the
                           aggregate Base Price of the Common Stock remaining
                           subject to the Performance Shares immediately prior
                           to such reorganization, merger or consolidation.
<PAGE>   4
                  k.       Reorganization in Which the Company is Not the
                           Surviving Corporation or Sale of Assets or Stock.
                           Upon the dissolution or liquidation of the Company,
                           or upon a merger, consolidation or reorganization of
                           the Company with one or more other corporations in
                           which the Company is not the surviving corporation,
                           or upon a sale of substantially all the assets of the
                           Company to another corporation, or upon any
                           transaction (including, without limitation, a merger
                           or reorganization in which the Company is the
                           surviving corporation) approved by the Board which
                           results in any person or entity owning Eighty percent
                           (80%) or more of the combined voting power of all
                           classes of the stock of the Company, unless provision
                           is made in writing in connection with such
                           transaction for the assumption of this Agreement with
                           such adjustments as the Board deems appropriate with
                           respect to the features, terms and conditions of the
                           Performance Shares, the Performance Shares hereunder
                           shall immediately entitle the Executive to a
                           Performance Bonus in an amount equal to the
                           difference between the applicable Base Price and the
                           Fair Market Value of the per share Common Stock on
                           the trading date immediately preceding the closing
                           date of such Transaction, and any unpaid portion of a
                           previously vested Performance Bonus shall be
                           immediately paid.

                  l.       Adjustments. In all cases, the nature and extent of
                           adjustments under this Section 3 shall be determined
                           by the Committee in its sole discretion, and any such
                           determination as to what adjustments shall be made,
                           and the extent thereof, shall be final and binding.

         16. WITHHOLDING OF TAXES. The parties hereto recognize that the Company
may be obligated to withhold federal, state and local income taxes and Social
Security taxes to the extent that the Executive realizes ordinary income in
connection with receipt of the Performance Bonus pursuant to this Agreement. The
Executive agrees that the Company may withhold amounts needed to cover such
taxes from payments otherwise due and owing to the Executive.

         17. DISCLAIMER OF RIGHTS. No provision in this Agreement shall be
construed to confer upon the Executive the right to be employed by the Company,
or to interfere in any way with the right and authority of the Company either to
increase or decrease the compensation of the Executive at any time, or to
terminate any employment or other relationship between the Executive and the
Company.

         18. INTERPRETATION OF PERFORMANCE SHARE AGREEMENT. All decisions and
interpretations made by the Committee or the Board of Directors of the Company
with regard to any questions arising under this Agreement shall be binding and
conclusive on the Company and the Executive.

         19. TERMINATION. Except as otherwise provided herein, this Agreement
shall terminate and all rights and obligations of the parties hereunder shall be
void and of no effect immediately upon the date the Executive ceases to hold the
same, equivalent or higher grade office as that office set forth in the first
paragraph of this Agreement or March 31, 2002,
<PAGE>   5
whichever occurs first. For purposes of this Agreement, an approved leave of
absence shall not be deemed an event resulting in the Executive ceasing to hold
such office under this Agreement. An approved leave of absence shall mean an
absence approved by the Committee for military leave, sick leave, or other bona
fide leave, as long as the Executive's right to re-employment is guaranteed by
contract, statute or the policy of the Company.

         20. MISCELLANEOUS

                  e.       Title and Headings. Titles and headings of sections
                           of the Agreement are for convenience of reference
                           only and shall not affect the construction of any
                           provision of this Agreement.

                  f.       Governing Law. This Agreement shall be governed by,
                           interpreted under and construed and enforced in
                           accordance with the internal laws, and not the laws
                           pertaining to conflicts or choice of laws, of the
                           State of Delaware.


                  IN WITNESS WHEREOF, the parties have executed this agreement
as of July 21, 1999.



ORBITAL SCIENCES CORPORATION


By:      /s/ Kelly H. Burke                     /s/ Jeffrey V. Pirone
         ------------------                     ---------------------
             Kelly H. Burke                         Jeffrey V. Pirone
             Chairman of the Human Resources        Executive Vice President and
             and Nominating Committee               Chief Financial Officer




<PAGE>   1
                                   EXHIBIT 11.
                 STATEMENT RE: COMPUTATION OF EARNINGS PER SHARE

<TABLE>
<CAPTION>
THREE-MONTH PERIOD ENDED SEPTEMBER 30, 1999
- ---------------------------------------------------------------------------------------------
                                                                                   ASSUMING
                                                                  BASIC          DILUTION (2)
                                                              -------------      ------------
<S>                                                           <C>                <C>
WEIGHTED AVERAGE OF OUTSTANDING SHARES                           37,384,519        37,384,519

COMMON EQUIVALENT SHARES:
     OUTSTANDING STOCK OPTIONS                                          N/A           613,951

OTHER POTENTIALLY DILUTIVE SECURITIES:
     CONVERTIBLE NOTES (1)                                              N/A         3,571,429

                                                              -------------      ------------
SHARES USED IN COMPUTING
NET INCOME PER COMMON SHARE                                      37,384,519        41,569,899
                                                              =============      ============


NET INCOME                                                    $ (32,649,000)     $(32,649,000)

ADJUSTMENTS ASSUMING DILUTION:
     INTEREST EXPENSE ADJUSTMENT, NET OF APPLICABLE TAXES               N/A         1,250,000

                                                              -------------      ------------
NET INCOME                                                    $ (32,649,000)     $(31,399,000)
                                                              =============      ============


NET INCOME PER COMMON SHARE (AS CALCULATED)                   $       (0.87)     $      (0.76)
                                                              =============      ============


NET INCOME PER COMMON SHARE                                   $       (0.87)     $      (0.87)
                                                              =============      ============
</TABLE>

<TABLE>
<CAPTION>
NINE-MONTH PERIOD ENDED SEPTEMBER 30, 1999
- ---------------------------------------------------------------------------------------------
                                                                                   ASSUMING
                                                                  BASIC          DILUTION (2)
                                                              -------------      ------------
<S>                                                           <C>                <C>
WEIGHTED AVERAGE OF OUTSTANDING SHARES                           37,240,742        37,240,742

COMMON EQUIVALENT SHARES:
     OUTSTANDING STOCK OPTIONS                                          N/A           936,934

OTHER POTENTIALLY DILUTIVE SECURITIES:
     CONVERTIBLE NOTES (1)                                              N/A         3,571,429

                                                              -------------      ------------
SHARES USED IN COMPUTING
NET INCOME PER COMMON SHARE                                      37,240,742        41,749,105
                                                              =============      ============


NET INCOME                                                    $ (71,507,000)     $(71,507,000)

ADJUSTMENTS ASSUMING DILUTION:
     INTEREST EXPENSE ADJUSTMENT, NET OF APPLICABLE TAXES               N/A         3,750,000

                                                              -------------      ------------
NET INCOME                                                    $ (71,507,000)     $(67,757,000)
                                                              =============      ============


NET INCOME PER COMMON SHARE (AS CALCULATED)                   $       (1.92)     $      (1.62)
                                                              =============      ============


NET INCOME PER COMMON SHARE                                   $       (1.92)     $      (1.92)
                                                              =============      ============
</TABLE>

NOTES:

(1) -    On September 16, 1997, the company sold $100 million of 5% convertible
         subordinated notes due October 2002. The notes are convertible at the
         option of the holders into Orbital common stock at a conversion price
         of $28.00 per share.



(2) -    Subsidiary stock options that enable holders to obtain subsidiary's
         common stock pursuant to effective stock option plans are included in
         computing the subsidiary's earnings per share, to the extent dilutive.
         Those earnings per share data are included in the Company's per share
         computations based on the Company's holdings of the subsidiary's stock.
         For the three and nine months ended September 30, 1999, all such
         subsidiary stock options were anti-dilutive











<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF EARNINGS AT AND FOR
THE NINE MONTHS ENDED SEPTEMBER 30, 1999 AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                          21,066
<SECURITIES>                                    18,174
<RECEIVABLES>                                  287,423
<ALLOWANCES>                                  (16,974)
<INVENTORY>                                     65,053
<CURRENT-ASSETS>                               386,099
<PP&E>                                         309,205
<DEPRECIATION>                               (122,495)
<TOTAL-ASSETS>                               1,122,320
<CURRENT-LIABILITIES>                          376,374
<BONDS>                                        313,925
                                0
                                          0
<COMMON>                                           374
<OTHER-SE>                                     408,143
<TOTAL-LIABILITY-AND-EQUITY>                 1,122,320
<SALES>                                        685,538
<TOTAL-REVENUES>                               685,538
<CGS>                                          529,668
<TOTAL-COSTS>                                  529,668
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                19,985
<INTEREST-EXPENSE>                               7,036
<INCOME-PRETAX>                               (65,899)
<INCOME-TAX>                                     5,608
<INCOME-CONTINUING>                           (71,507)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (71,507)
<EPS-BASIC>                                     (1.92)
<EPS-DILUTED>                                   (1.92)


</TABLE>


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