SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-K
                             ----------------------

             (Mark One)
            [X] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 1998
                                             -----------------

           [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                        For the transition period from _________ to____________

                         Commission file number 0-18277
                                                -------

                                VICOR CORPORATION
                                -----------------
             (Exact name of registrant as specified in its charter)

                              Delaware                 04-2742817
                              --------                 ----------
                  (State or other jurisdiction of     (IRS employer
                   incorporation or organization)     identification no.)

                 25 FRONTAGE  ROAD,  ANDOVER,  MASSACHUSETTS  01810  
                 ----------------------------------------------------
              (Address of principal executive offices) (Zip code)

       Registrant's telephone number, including area code: (978) 470-2900
                                                           ---------------

        Securities registered pursuant to Section 12(b) of the Act: None

           Securities registered pursuant to Section 12(g) of the Act:

                          Common Stock, $.01 par value
                          ----------------------------
                                (Title of Class)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. YES [X] NO [ ]

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [X]

The  aggregate  market value of the voting stock held by  non-affiliates  of the
registrant was approximately $213,813,099 as of February 26, 1999.

On February 26, 1999, there were 29,441,608  shares of Common Stock  outstanding
and 12,103,309 shares of Class B Common Stock outstanding.

                       DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Company's  definitive  proxy  statement (the  "Definitive  Proxy
Statement") to be filed with the Securities and Exchange  Commission pursuant to
Regulation 14A and relating to the Company's 1999 annual meeting of stockholders
are incorporated by reference into Part III.


 


PART I

     This Annual Report on Form 10-K contains forward-looking  statements within
the  meaning of Section  27A of the  Securities  Act of 1933,  as  amended,  and
Section 21E of the Securities  Exchange Act of 1934, as amended.  Actual results
could differ materially from those projected in the  forward-looking  statements
as a result of, among other factors,  the risk factors set forth in this report.
Reference  is made in  particular  to the  discussions  set forth  under  Item 1
"Business - Second-Generation  Automated  Manufacturing  Line," "- Competition,"
"Patents," and "- Licensing,"  and under Item 7 -  "Management's  Discussion and
Analysis of Financial Condition and Results of Operations."

ITEM 1 - BUSINESS

THE COMPANY

     Vicor  Corporation was incorporated in Delaware in 1981. Unless the context
indicates  otherwise,  the  term  "Company"  means  Vicor  Corporation  and  its
consolidated  subsidiaries.  The Company  designs,  develops,  manufactures  and
markets modular power components and complete power systems using an innovative,
patented,  high frequency  electronic power conversion  technology  called "zero
current  switching." Power systems,  a central element in any electronic system,
convert power from a primary power source (e.g.,  a wall outlet) into the stable
DC voltages that are required by most contemporary electronic circuits.

     In 1987, the Company formed VLT Corporation as its licensing subsidiary. In
1990,  the  Company  established  a  Technical  Support  Center in Germany and a
foreign sales corporation.  In 1995, the Company  established  Technical Support
Centers in France,  Italy,  Hong Kong,  and England.  Also in 1995,  the Company
established  Vicor  Integration  Architects  (VIAs),  which are  majority  owned
subsidiaries.  VIAs  provide  customers  with  local  design  and  manufacturing
services  for turnkey  custom power  solutions.  At December 31, 1998 there were
five (5) VIAs operating in the United States.  In 1996, the Company  established
Vicor B.V.,  a  Netherlands  company,  which  serves as a European  Distribution
Center.  In 1998,  the Company  acquired the  principal  assets of the switching
power supply businesses owned by the Japan Tobacco, Inc. group and established a
direct  presence in Japan through a new  subsidiary  called Vicor Japan Company,
Ltd  ("VJCL").  VJCL  markets  and sells the  Company's  products  and  provides
customer  support in Japan.  The Company  became  publicly  traded on the NASDAQ
National Market System in April 1990.

PRODUCTS

     Power systems are incorporated into virtually all electronic products, such
as computers and telecommunication  equipment,  to convert electric power from a
primary source, for example a wall outlet,  into the stable DC voltages required
by  electronic  circuits.  Since  power  systems are  configured  in a myriad of
application-specific  configurations, the Company's basic strategy is to exploit
the  density  and   performance   advantages  of  its   technology  by  offering
comprehensive families of economical,  component-level building blocks which can
be applied by users to easily  configure a power system specific to their needs.
In addition to  component-level  power converters,  which serve as modular power
system  building  blocks,  the  Company  also  manufactures  and sells  complete
configurable power systems,  accessory products, and custom power solutions. The
Company's principal product lines include:

     Modular Power Converters

     The   Company   currently   offers  four  first   generation   families  of
component-level DC-DC power converters:  the VI-200,  VI-J00, MI-200, and MI-J00
families.  Designed to be mounted  directly on a printed  circuit board assembly
and soldered in place using contemporary  manufacturing  processes,  each family
comprises a  comprehensive  set of products which are offered in a wide range of
input voltage, output voltage and power ratings. This allows end users to select
products appropriate to their individual applications.

     The  product   families  differ  in  maximum  power  ratings,   performance
characteristics,  package size and, in the case of the "MI" families,  in target
market  (the  MI  families  are  designed  specifically  to  meet  many  of  the
performance and environmental requirements of the military/defense markets).






     In 1998, the Company  introduced  the first  complete  family of its second
generation of high power density,  component-level DC-DC converters. This family
operates from 48 Volts input and is designed for the  telecommunications  market
as well as distributed power systems. It consists of twenty-six modules with the
most popular  output  voltages in all three of the Company's  second  generation
standard  packages:  the full  size  (Maxi),  the half size  (Mini)  and the new
quarter  size  (Micro).  Output power levels from 50 to 500 Watts are covered by
this offering.

     Configurable Products

     Utilizing  its  standard  converters  as core  elements,  the  Company  has
developed  several  product  families  which provide  complete  power  solutions
configured to a customer's  specific needs.  These products exploit the benefits
of the  component-level  approach  to offer  higher  performance,  higher  power
densities, lower costs, greater flexibility and faster delivery than traditional
competitive offerings.

     Most  electronic  and data  processing  ("EDP") and  industrial  electronic
products  operate  directly off of AC lines.  "Off-line"  power systems  require
"front end"  circuitry  to convert AC line  voltage into DC voltage for the core
converters.  The Company's off-line AC-DC products  incorporate a set of modular
front end subassemblies to offer a complete power solution from AC line input to
highly regulated DC output. The product selection includes a low-profile modular
design in  various  sizes  and power  levels,  and a choice of  alternatives  to
conventional   "box   switchers"--high   power,   off-line   bulk   supplies  in
industry-standard packages. Voltage and power levels are either factory or field
configurable.

     Many  telecommunications,  defense and industrial  electronic  products are
powered from central DC sources  (battery plants or  generators).  The Company's
DC-DC power system choices  include a low-profile  modular design similar to the
corresponding AC-DC system, and a rugged,  compact assembly for chassis-mounted,
bulk power applications.

     Accessory Power System Components

     Accessory power system components,  used with the Company's component-level
power  converters,  integrate  other  important  functions of the power  system,
facilitating  the design of complete  power systems by  interconnecting  several
modules.  In general,  accessory  products are used to condition  the inputs and
outputs of the Company's modular power components.

     VI-HAMs    (Harmonic    Attenuator    Modules)   are    universal-AC-input,
power-factor-correcting  front ends for use with  compatible  power  converters.
VI-AIMs (AC Input Modules)  provide input  filtering,  transient  protection and
rectification of the AC line. VI-IAMs (Input Attenuator  Modules) provide the DC
input   filtering  and   transient   protection   required  in  industrial   and
telecommunications   markets.  VI-RAMs  (Ripple  Attenuator  Modules)  condition
converter  module outputs for extremely low noise systems.  In 1998, the Company
doubled the power capability of its component-level AC front end, the VI-ARM (AC
Rectifier  Module).  This new front end product is packaged in the same  "Micro"
package and includes a microcontroller that tracks the AC line to ensure correct
operation for domestic or international line voltages.

     Customer Specific Products

     Since its inception,  the Company has accepted a certain amount of "custom"
power  supply  business.  In most  cases,  the  customer  was unable to obtain a
conventional  solution  which could achieve the desired level of  performance in
the available  space.  By utilizing its  component-level  power products as core
elements in developing most of these products,  the Company was able to meet the
customer's needs with a reliable,  high power density, total solution.  However,
in keeping with the Company's strategy of focusing on sales of standard families
of  component-level  power building  blocks,  custom product sales have not been
directly   pursued.   The  Company  has   traditionally   pursued  these  custom
opportunities through  Value-Added-Resellers  ("VARs"). The Company has also put
in place a network of Vicor Integration  Architects ("VIAs") (see "The Company,"
above in Item 1 -  "Business").  VIAs are majority  owned by the Company,  while
VARs  are   independent   businesses.   Both  VIAs  and  VARs  are   distributed
geographically and are in close proximity to many of their customers.








SALES AND MARKETING

     The Company sells its products  through a network of 33  independent  sales
representative  organizations  in North and South America;  internationally,  38
independent  distributors are utilized.  Sales activities are managed by a staff
of  Regional  and  Industry  Sales  Managers  and sales  personnel  based at the
Company's world headquarters in Andover, Massachusetts,  its Westcor division in
Sunnyvale,  California, a Technical Support Center in Lombard,  Illinois, and in
its Technical Support Center subsidiaries in Munich, Germany;  Camberley Surrey,
England; Milan, Italy; Paris, France; Hong Kong and Tokyo, Japan.

     Export sales,  as a percentage of total net  revenues,  were  approximately
29%, 31%, and 30%, in 1998, 1997, and 1996, respectively. The decrease in export
sales during 1998 as compared to 1997 and 1996 is primarily due to a decrease in
revenue earned from the sale of automated manufacturing line equipment.

     Because of the technical nature of the Company's product lines, the Company
engages a staff of Customer  Applications  Engineers  to support  the  Company's
sales activities. Customer Applications Engineers provide direct technical sales
support worldwide to review new applications and technical matters with existing
and potential customers.  In 1995, the Company significantly  expanded its staff
of Customer  Applications  Engineers  by opening  Technical  Support  Centers in
Italy,  France,  United  Kingdom  and  Hong  Kong,  complementing  its  existing
Technical Support Center in Germany. The Company generally warrants its standard
products for a period of two years.

     The Company also sells  directly to customers  through  Vicor  Express,  an
in-house  distribution group.  Through space advertising and periodic mailing of
its catalogs,  Vicor Express  generally offers customers rapid delivery on small
quantities  of many standard  products.  The Company,  through  Vicor B.V.,  has
expanded its Vicor Express operation to include locations in Germany, France and
Italy.

CUSTOMERS AND APPLICATIONS

     The  Company's  customer  base is  comprised  of large  Original  Equipment
Manufacturers  (OEMs)  and  smaller,   lower  volume  users  which  are  broadly
distributed  across  several  major market  areas.  Some examples of the diverse
applications of the Company's products are:

 Telecommunications:                     EDP:
    Central Office Systems                  Workstations
    Fiber Optic Systems                     Supercomputers
    Cellular Telecommunications             Data Storage Systems
    Microwave Communications                ATM Switches
    Voice Processing Multiplexers           Networking Equipment
    Paging Equipment                        LAN/WAN Systems
    Broadcast Equipment                     File Servers
                                            RAID Systems

 Measurement and Control:                Military:
    Process Control Equipment               Communications
    Medical Equipment                       Airborne Radar and Displays
    Seismic Equipment                       Aircraft/Weapons Test Equipment
    Test Equipment                          Ruggedized Computers
    Transportation Systems                  Electro-Optical Systems
    Agricultural Equipment                  IR Reconnaissance/Targeting Systems
    Marine Products

     For the years ended  December 31, 1998,  1997 and 1996, no single  customer
accounted for more than 10% of net revenues.



BACKLOG

     As of December 31, 1998, the Company had a backlog of  approximately  $37
million  compared to $48 million at December 31,  1997.  Backlog is comprised of
orders for products which have a scheduled  shipment date within the next twelve
months.  The Company maintains most standard converter products in inventory and
manufactures  other standard,  modified standard and custom products pursuant to
firm  orders from  customers.  The Company  believes  that due to its  increased
production   capacity  and  its  ability  to  respond   quickly  to   customers'
requirements,  a  substantial  portion  of sales in each  quarter  is,  and will
continue to be, derived from orders booked in the same quarter.

RESEARCH AND DEVELOPMENT

     As a basic element of its long term  strategy,  the Company is committed to
the continued  advancement of power  conversion  technology and power  component
product development.  The Company's research and development efforts are focused
in three areas:  continued  enhancement  of the Company's  patented  technology;
expansion of the Company's families of component level DC-DC converter products;
and  continued   development   of   configurable   products  based  upon  market
opportunities.  The Company invested approximately $20.7 million, $17.7 million,
and  $14.3  million,  in  research  and  development  in 1998,  1997  and  1996,
respectively.  Investment in research and development  represented 12.5%, 10.9%,
and 9.9%, of net revenues in 1998,  1997 and 1996. The Company plans to continue
to invest a significant percentage of revenues into research and development.

MANUFACTURING

     The Company's principal  manufacturing processes are assembly of electronic
components onto printed circuit boards,  automatic testing of components,  wave,
reflow  and  infrared  soldering  of  assembled  components,   encapsulation  of
converter  subassemblies,  final "burn-in" of certain  products and product test
using automatic test equipment.

     The  Company  continues  to  execute on its  strategy  to  minimize  manual
assembly processes,  reduce  manufacturing  costs,  increase product quality and
reliability and ensure its ability to rapidly and effectively  expand  capacity.
The  strategy  is  based  upon  the  phased  acquisition   and/or   fabrication,
qualification  and  integration  of  automated   manufacturing   equipment.   In
accordance  with this  strategy,  the  Company  purchased a building in December
1994, with  approximately  136,000 square feet. The Company is in the process of
expanding  this building by  approximately  70% (see Item 2 -  Properties).  The
Company continues the process of installing its automated manufacturing lines in
these premises (see  "Second-Generation  Automated  Manufacturing Line," below),
including automated  manufacturing lines acquired from Japan Tobacco,  Inc. (see
"Licensing,") below).

     Components  used in the Company's  products are purchased from a variety of
vendors.  Most  of the  components  are  available  from  multiple  sources.  In
instances in which single source items do exist,  the Company  maintains what it
considers  to  be  appropriate  levels  of  inventories.   Incoming  components,
assemblies  and other  parts  are  subjected  to  several  levels of  inspection
procedures.

     Compliance by the Company with  applicable  environmental  laws has not had
any material effect on the financial condition or operations of the Company.

SECOND-GENERATION AUTOMATED MANUFACTURING LINE

     Shipments of  second-generation  products continued to increase during 1998
which included the introduction of a new 48 Volt family of products.  Both first
and second generation products are sold to similar customers.  The Company still
continues to make modifications to the designs,  processes,  equipment and parts
associated  with  second-generation  products.  While  management  believes that
significant progress has been made, there can be no assurance that problems will
not  substantially  delay the  ultimate  general  introduction  of the  complete
product line,  require  continued  modification  of product  specifications,  or
prevent  attainment  of  the  anticipated  capacity  of  the   second-generation
manufacturing  line.  Significant  revenues from the sale of any products in the
Company's  second-generation  product line are not expected to occur for several
quarters.  The  Company  began  depreciation  on a  significant  portion  of the
second-generation  automated manufacturing line, approximately $32.5 million, in
the second  quarter of 1998.  Depreciation  on another  $1.6  million  commenced
during the second half of 1998.  Approximately $3.3 million of this line will be
depreciated  on  a  straight-line  basis  over  a  period  of  five  years,  and
approximately  $30.8 million will be depreciated on a straight-line basis over a
period of eight  years.  Consequently,  this  depreciation  and other  fixed and
variable costs  associated  with the ramp-up of production of  second-generation
products are not expected to be fully absorbed until higher  production  volumes
and higher yield levels are achieved.  As a result,  gross  margins  during 1999
will  continue to be negatively  impacted  until higher  production  volumes and
higher yield levels are attained.



COMPETITION

     Many power  supply  manufacturers  target  markets  similar to those of the
Company. Representative examples are: Lambda Electronics, a subsidiary of Siebe,
plc; Lucent Technologies; Artesyn Technologies (formerly Computer Products, Inc.
and Zytec Corporation);  Astec America;  Power-One,  Inc.; and C&D Technologies,
Inc., Power Electronics Division.  Although certain of the Company's competitors
have  significantly   greater  financial  and  marketing  resources  and  longer
operating histories than the Company,  the Company believes that it has a strong
competitive  position,  particularly with customers who need small, high density
power system solutions requiring a variety of input-output configurations.

PATENTS

     The Company  believes  that its patents  afford  significant  advantages by
erecting fundamental and multilayered barriers to competitive  encroachment upon
key features and performance  benefits of its principal  product  families.  The
Company's  patents cover the fundamental  conversion  topologies used to achieve
the  performance  attributes of its converter  product  lines;  converter  array
architectures  which are the basis of the products'  "parallelability";  product
packaging design; product construction;  high frequency magnetic structures; and
automated  equipment and methods for circuit and product  assembly.  The Company
believes in  vigorously  protecting  its rights  under its patents  (see "Item 3
Legal Proceedings," below).

     On February 16, 1999, the United States Patent and Trademark  Office issued
U.S.  patent  RE36,098  (the  "Reissue  Patent")  as a  reissue  of U.S.  Patent
4,441,146 (the "Reset  Patent").  The Reissue Patent includes  original claims 1
through 5 of the Reset Patent plus 38 additional  new claims.  The claims in the
Reissue Patent cover non-coincident active clamp technology in a broadly defined
class of single-ended  forward  converters and enable design of power converters
which are smaller and more energy  efficient than  conventional  power supplies.
The claims cover,  but are not limited to,  so-called  "zero-voltage  switching"
("ZVS") technology.  The Company believes that its rights under the Reset Patent
and the Reissue Patent have been and are being infringed.

     The Company has been issued forty-nine  patents in the United States (which
expire between 2001 and 2017), fourteen in Europe (which expire between 2002 and
2017  and  which  comprise  a  total  of  fifty-one  issued  patents  in  twelve
countries),  and nineteen in Japan  (which  expire  between 2002 and 2017).  The
Company also has a number of patent  applications  pending in the United States,
Europe and the Far East.  Although  the  Company  believes  that  patents are an
effective way of protecting its technology,  there can be no assurances that the
Company's patents will prove to be enforceable (see, e.g., "Legal  Proceedings",
below).  While some of the Company's patents are deemed materially  important to
the Company's  operations,  the Company believes that no one patent is essential
to the success of the Company.

LICENSING

     In addition to generating revenue, licensing is an element of the Company's
strategy for building  worldwide  product and  technology  acceptance and market
share. In granting  licenses,  the Company retains the right to use its patented
technologies,  and manufacture and sell its products, in all licensed geographic
areas and fields of use.  Licenses  are  granted  and  administered  through the
Company's wholly owned  subsidiary,  VLT  Corporation,  which owns the Company's
patents.

     Revenues from licensing arrangements have not exceeded 10% of the Company's
consolidated revenues in any of the last three fiscal years.




     On June 4, 1998,  the Company  entered  into an agreement to acquire all of
the principal assets and the power supply business of JT Electronics Corporation
and JT PowerCraft,  in Japan. Both companies were subsidiaries of Japan Tobacco,
Inc. ("JT"), the Company's licensee in Japan at the time. Under the terms of the
agreement,  JT continued to provide  certain  services in Japan,  including  the
manufacture  of  products,  through  the end of 1998,  at which time its license
terminated. The final royalty revenue to be recognized from JT under the license
agreement  will be in the first quarter of 1999.  The Company  founded VJCL (see
"Item 1-  "Business")  to operate in the  Japanese  market and is  applying  the
acquired assets to service and expand its power supply business in Japan.

     On March 4, 1998 and on April 20, 1998,  the Company  announced that it had
entered into license  agreements with NEC  Corporation  ("NEC") and Nagano Japan
Radio  Co.,  Ltd.  ("NJRC"),  respectively,  under  which NEC and NJRC  acquired
non-exclusive  rights to use the Company's  patented "reset" technology in their
power conversion products.  Reset technology (which has also become known in the
power  conversion  industry  as "active  clamp"  technology)  enables  design of
"zero-voltage  switching"  power  converters  which are  smaller and more energy
efficient than conventional power supplies.

EMPLOYEES

     As of December 31, 1998, the Company employed approximately 1,129 full time
and 187 part time  people.  The  Company  believes  that its  continued  success
depends,  in part,  on its  ability to attract and retain  qualified  personnel.
Although there is strong demand for qualified technical  personnel,  the Company
has not to date  experienced  difficulty in attracting and retaining  sufficient
engineering and technical personnel to meet its needs.

     None of the  Company's  employees  is  subject to a  collective  bargaining
agreement.  The Company has not experienced any work stoppages and believes that
its employee relations are good.

ITEM 2 - PROPERTIES

     During  1998,  the  Company  completed  construction  of  a  new  corporate
headquarters  building on a site adjacent to its prior headquarters  building in
Andover,  Massachusetts.  The building provides approximately 90,000 square feet
of  office  space  for its  sales,  marketing,  engineering  and  administration
personnel.

     The  Company  holds a lease on its prior  corporate  headquarters  building
which expires in the fourth quarter of 1999. This building  currently holds some
manufacturing  equipment,  which  will be moved to the  Company's  manufacturing
facility in Andover, Massachusetts, prior to the lease termination.

     The Company also owns a building of  approximately  136,000 square feet, in
Andover,  Massachusetts.  During 1998, the Company  continued  construction of a
94,000 square foot  expansion of this  building,  which will provide  additional
capacity for manufacturing. Completion of the expansion is expected in the first
quarter of 1999.

     The   Company's   Westcor   division   owns  and  occupies  a  building  of
approximately 31,000 square feet, in Sunnyvale, California.

ITEM 3 - LEGAL PROCEEDINGS

     On October 17,  1996,  the Company  filed a  complaint  in Munich  District
Court,  Federal  Republic of Germany,  citing  Nemic-Lambda  of Japan and Lambda
Electronics GmbH for infringement of Vicor's German "reset" patent. On September
30,  1998,  the German  Patent  Court  held a hearing in which the Patent  Court
identified a 1981  publication,  which had not been  considered  in the original
prosecution of the patent  application by the European  Patent Office during the
early 1980s, as the "closest prior art." In view of the publication,  the Patent
Court  characterized  the German Reset Patent as lacking  invention and declared
all of the claims of the German Reset Patent null and void.



     On  February  1, 1999,  the  Company  announced  that it had  concluded  an
arrangement  under which  Vicor and Reltec  Corporation  entered  into a license
agreement and agreed to settle all pending  litigation  and disputes relating to
Reltec's past use of certain Vicor intellectual  property.  In consideration for
the license under the Company's  reset patents,  and the separate  settlement of
the litigation,  Reltec made a one-time  payment of $22.5 million into an escrow
account.  Vicor is obligated to make know-how and technical support available to
Reltec under the license and will receive and  recognize  income from the escrow
fund into the year 2001.

     The Company is involved in certain litigation  incidental to the conduct of
its  business.  While the  outcome of lawsuits  against  the  Company  cannot be
predicted with certainty,  management does not expect any current  litigation to
have a material adverse impact on the Company (see "Licensing," above).


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

     None.

PART II

ITEM 5 - MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

     The Common Stock of the Company is listed on the National  Market System of
the National  Association of Securities Dealers Automated  Quotation  ("NASDAQ")
System and is traded in the  over-the-counter  market  under the  NASDAQ  symbol
"VICR".  The Class B Common Stock of the Company is not traded on any market and
is subject to restrictions on transfer under the Company's Restated  Certificate
of  Incorporation.  The following  table sets forth the  quarterly  high and low
sales  prices  for the  Common  Stock as  reported  by  NASDAQ  for the  periods
indicated:

1997                                High                    Low
- ----                                ----                    ---

First Quarter                       19                      13 1/8
Second Quarter                      23 3/8                  13 1/8
Third Quarter                       30 1/8                  21
Fourth Quarter                      36 1/4                  24 1/8

1998
- ----

First Quarter                       29 3/4                  22
Second Quarter                      28 5/8                  12 15/16
Third Quarter                       16 1/2                   7 13/16
Fourth Quarter                      11 7/8                   5  9/16

     As of February 26, 1999, there were  approximately 530 holders of record of
the  Company's  Common  Stock  and  approximately  30  holders  of record of the
Company's Class B Common Stock. These numbers do not reflect persons or entities
who hold  their  stock in nominee or "street  name"  through  various  brokerage
firms.

DIVIDEND POLICY

     The Company has not paid cash  dividends on its common equity and it is the
Company's  present  intention to retain earnings to finance the expansion of the
Company's business.






ITEM 6 - SELECTED FINANCIAL DATA

     The  following  selected  consolidated  financial  data with respect to the
Company's  statements of income for the years ended December 31, 1998,  1997 and
1996 and with respect to the  Company's  balance  sheets as of December 31, 1998
and 1997 are derived from the Company's consolidated financial statements, which
appear  elsewhere  in this  report and which have been  audited by Ernst & Young
LLP, independent auditors.  The following selected  consolidated  financial data
with respect to the Company's  statements of income for the years ended December
31,  1995 and 1994  and with  respect  to the  Company's  balance  sheets  as of
December  31,  1996,  1995 and  1994 are  derived  from  the  Company's  audited
consolidated  financial  statements,  which are not  included  herein.  The data
should  be read in  conjunction  with  the  consolidated  financial  statements,
related notes and other financial information included herein.





                                                                  Year Ended December 31
                                                                  ----------------------
                                                          (in thousands except per share data)


Income Statement Data                     1998             1997             1996            1995           1994
- ---------------------                     ----             ----             ----            ----           ----
                                                                                              
Net Revenues                           $164,634          $162,243         $144,983        $144,022       $115,444
Income from operations                   18,365            35,950           36,532          42,632         33,340
Net income                               15,835            26,217           25,639          29,498         22,135
Net income per share -diluted               .37               .60              .60             .68            .52
Weighted average shares-diluted          42,785            43,344           42,764          43,295         42,963

                                                                
                                                                 At December 31
                                                                 --------------
                                                                  (in thousands)




Balance Sheet Data                        1998             1997             1996            1995           1994
- ------------------                        ----             ----             ----            ----           ----
                                                                                              
Working capital                        $ 84,594          $128,267         $108,551        $ 95,900       $ 65,015
Total assets                            249,551           228,843          186,443         166,997        126,492
Total liabilities                        40,292            20,419           15,699          16,941         13,014
Stockholders' equity                    209,259           208,424          170,744         150,056        113,478



ITEM 7 - MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS

     The  following  table sets forth  certain  items of  selected  consolidated
financial information as a percentage of net revenues for the periods indicated.
This table and the subsequent  discussion should be read in conjunction with the
selected financial data and the Consolidated Financial Statements of the Company
contained elsewhere in this report.




                                                                        Year ended December 31 
                                                                        ---------------------- 

                                                                     1998           1997          1996           
                                                                     ----           ----          ----           
                                                                                           
Net revenues                                                        100.0%          100.0%       100.0%
Gross margin                                                         44.9%           51.8%        53.9%
Selling, general and administrative expenses                         21.2%           18.7%        18.8%
Research and development expenses                                    12.5%           10.9%         9.9%
Income before income taxes                                           14.1%           25.2%        27.9%





YEAR ENDED DECEMBER 31, 1998 COMPARED TO YEAR ENDED DECEMBER 31, 1997:

     Net revenues for fiscal 1998 were  $164,634,000,  an increase of $2,391,000
(1.5%) as  compared  to  $162,243,000  for fiscal  1997.  The growth in revenues
resulted  primarily from a net increase in unit shipments of standard and custom
products  of  approximately  $8,760,000,  offset  by  reductions  in the sale of
automated  manufacturing  line  equipment  and license  income of  approximately
$5,285,000 and $1,085,000, respectively.

     Gross margin decreased $10,060,000 (12.0%) from $84,009,000 to $73,949,000,
and decreased as a percentage  of net revenues from 51.8% to 44.9%.  The primary
component  of the  fluctuations  in gross  margin  dollars and  percentage  were
attributable  to  depreciation  on the  second  generation  production  line  of
approximately  $3,370,000  in 1998,  and to changes in the  revenue  mix.  Gross
margins in 1999 will continue to be negatively  impacted by the  depreciation of
the second generation  automated production line until higher production volumes
and higher yield levels are attained.

     Selling,  general,  and  administrative  expenses were  $34,934,000 for the
year, an increase of $4,607,000 (15.2%) over fiscal 1997. As a percentage of net
revenues,  selling,  general and administrative expenses increased to 21.2% from
18.7%.  The principal  components  of the  $4,607,000  increase were  $1,481,000
(12.6%)  of  compensation  expense  due to annual  pay  increases  and growth in
staffing  levels of sales and  administrative  personnel;  $934,000  (140.2%) of
increased costs for training and consulting fees for the  implementation  of the
Enterprise  Resource  Planning  system;  $900,000  (76.8%)  of  increased  legal
expenses;  $260,000  (16.1%) of increased  selling,  general and  administrative
expenses in the Company's Vicor Integration Architect subsidiaries, and $210,000
(5.6%) of increased advertising costs.

     Research  and  development   expenses   increased   $2,918,000  (16.5%)  to
$20,650,000,  and increased as a percentage of net revenues to 12.5% from 10.9%.
The principal  components of the $2,918,000  increase were $2,312,000 (21.6%) of
compensation  expense due to annual pay increases and growth in staffing  levels
of engineering  personnel,  primarily related to the research and development of
the second  generation  product  line,  and  $539,000  (100.0%) of research  and
development  costs  associated with VJCL, which was established in July of 1998.
The Company has a long-term commitment to reinvesting its profits in new product
design  and  development  in order  to  maintain  and  improve  its  competitive
position.

     Other  income  decreased  $92,000  (1.8%) to  $4,922,000.  Other  income is
primarily  comprised of interest income which was derived from invested cash and
cash equivalents, as well as notes receivable associated with the Company's real
estate  transactions.  Interest income decreased  primarily due to a decrease in
cash and cash equivalents balances.

     Income  before  income  taxes was  $23,287,000,  a decrease of  $17,677,000
(43.2%) compared to 1997. As a percentage of net revenues,  income before income
taxes decreased from 25.2% in 1997 to 14.1% in 1998.

     The  provision  for income taxes  totaled  $7,452,000  in 1998  compared to
$14,747,000 in 1997. The Company's overall tax rate was 32.0% and 36.0% for 1998
and 1997,  respectively.  The decrease in the  effective tax rate was due to the
impact of expected tax credits in 1998 on a lower level of income  before income
taxes.

     Net  income  in 1998  decreased  by  $10,382,000  to  $15,835,000.  Diluted
earnings per share were $.37 in 1998 compared to $.60 in 1997.

YEAR ENDED DECEMBER 31, 1997 COMPARED TO YEAR ENDED DECEMBER 31, 1996:

     Net revenues for fiscal 1997 were $162,243,000,  an increase of $17,260,000
(11.9%) as  compared to  $144,983,000  for fiscal  1996.  The growth in revenues
resulted  primarily from a net increase in unit shipments of standard and custom
products of  approximately  $22,800,000,  offset by reductions in license income
and  the  sale  of  automated  manufacturing  line  equipment  of  approximately
$3,200,000 and $2,300,000, respectively.

     Gross margin increased  $5,904,000  (7.6%) from $78,105,000 to $84,009,000,
but decreased as a percentage  of net revenues from 53.9% to 51.8%.  The primary
component of the fluctuations in gross margin dollars and percentage was changes
in the revenue mix.

     Selling,  general,  and  administrative  expenses were  $30,327,000 for the
year, an increase of $3,095,000 (11.4%) over fiscal 1996. As a percentage of net
revenues,  selling,  general and administrative expenses decreased from 18.8% to
18.7%.  The principal  components  of the  $3,095,000  increase were  $1,795,000
(17.9%) of  compensation  expense due to growth in staffing  levels of sales and
administrative personnel, increased sales commission expense of $758,000 (19.4%)
and increased legal expenses of $354,000 (43.3%).

     Research  and  development   expenses   increased   $3,391,000  (23.6%)  to
$17,732,000,  and  increased as a percentage of net revenues to 10.9% from 9.9%.
The principal  components of the $3,391,000  increase were $2,068,000 (25.6%) of
compensation expense due to growth in staffing levels of engineering  personnel,
an  increase  in project  materials  of $366,000  (13.0%),  $334,000  (26.7%) of
increased   depreciation   expense,   and  an  increase  in  the  Company's  VIA
subsidiaries' research and development expenses of $266,000 (60.4%).






     Other income increased  $1,154,000  (29.9%) to $5,014,000.  Other income is
primarily  comprised of interest income which was derived from invested cash and
cash equivalents, as well as notes receivable associated with the Company's real
estate  transactions.  Interest income increased primarily due to an increase in
these balances.

     Income before income taxes was $40,964,000,  an increase of $572,000 (1.4%)
compared to 1996. As a percentage  of net  revenues,  income before income taxes
decreased from 27.9% in 1996 to 25.2% in 1997.

     The  provision  for income taxes  totaled  $14,747,000  in 1997 compared to
$14,753,000 in 1996. The Company's overall tax rate was 36.0% and 36.5% for 1997
and 1996, respectively.

     Net income in 1997 increased by $578,000 to $26,217,000.  Diluted  earnings
per share were $.60 in 1997 and 1996.


LIQUIDITY AND CAPITAL RESOURCES

     At  December  31,  1998,  the  Company  had  $58,897,000  in cash  and cash
equivalents.  Working  capital  decreased  $43,673,000  during  the  year  ended
December 31,  1998.  This  decrease was due  primarily to a decrease in cash and
cash  equivalents  of  $25,962,000  and an  increase  in amounts  due for assets
acquired and accounts payable of $17,377,000.

     Cash used in investing  activities  during fiscal 1998 was $41,768,000,  an
increase of  $15,381,000  (58.3%)  compared to fiscal  1997.  This  increase was
primarily due to net additions to property and equipment of  $36,392,000  and an
increase in other assets of  $3,574,000.  Cash used in financing  activities was
$15,000,000  compared to cash provided by financing activities of $11,463,000 in
1997, a net change of $26,463,000.  This change is primarily attributed to a net
increase in the acquisition cost of treasury stock of $16,942,000 in 1998, and a
decrease in the net proceeds from the issuance of Common Stock upon the exercise
of stock options, and the related income tax benefit derived from such issuance,
of $9,870,000.

     The Company plans to continue its investments in  manufacturing  equipment,
much of which is built  internally.  The internal  construction of manufacturing
machinery,  in order to provide  for  additional  manufacturing  capacity,  is a
practice which the Company expects to follow for the foreseeable future.

     In November  1997,  the Board of  Directors of the Company  authorized  the
repurchase  of  the  Company's  Common  Stock  up  to  an  aggregate  amount  of
$30,000,000,  including amounts remaining under a prior authorization.  The plan
authorizes  the Company to make such  repurchases  from time to time in the open
market or through privately negotiated transactions.  The timing of this program
and the  amount of the stock that may be  repurchased  is at the  discretion  of
management  based on its view of economic and financial  market  conditions.  In
1998, the Company spent $17,625,000 for the repurchase of its Common Stock.

     The  Company  has an unused  line of  credit  with a bank  under  which the
Company may borrow up to  $4,000,000 on a revolving  credit  basis.  The Company
believes that cash generated from  operations and its cash and cash  equivalents
will be sufficient to fund planned  operations and capital  equipment  purchases
for the foreseeable  future. At December 31, 1998, the Company had approximately
$3,100,000 of capital expenditure commitments.

     The Company does not consider the impact of inflation  and changing  prices
on its business  activities or  fluctuations  in the exchange  rates for foreign
currency transactions to have been material during the last three fiscal years.

MARKET RISK

     The Company is exposed to a variety of market risks,  including  changes in
interest  rates  affecting  the  return  on its cash and  cash  equivalents  and
fluctuations  in foreign  currency  exchange  rates.  The Company's  exposure to
market risk for a change in interest  rates  relates  primarily to the Company's
cash and cash equivalents.






     As the Company's  cash and cash  equivalents  consist  principally of money
market  securities,  which are short-term in nature,  the Company's  exposure to
market risk on interest  rate  fluctuations  is not  significant.  The Company's
exposure to market risk for  fluctuations  in foreign  currency  exchange  rates
relates  primarily to the  operations  of VJCL.  The Company  believes that this
market risk is currently  not  significant  due to the  relative  size of VJCL's
operations.

OTHER

     Shipments of  second-generation  products continued to increase during 1998
which included the introduction of a new 48 volt family of products.  Both first
and second generation products are sold to similar customers.  The Company still
continues to make modifications to the designs,  processes,  equipment and parts
associated  with  second-generation  products.  While  management  believes that
significant progress has been made, there can be no assurance that problems will
not  substantially  delay the  ultimate  general  introduction  of the  complete
product line,  require  continued  modification  of product  specifications,  or
prevent  attainment  of  the  anticipated  capacity  of  the   second-generation
manufacturing  line.  Significant  revenues from the sale of any products in the
Company's  second-generation  product line are not expected to occur for several
quarters.  The  Company  began  depreciation  on a  significant  portion  of the
second-generation  automated manufacturing line, approximately $32.5 million, in
the second  quarter of 1998.  Depreciation  on another  $1.6  million  commenced
during the second half of 1998.  Approximately $3.3 million of this line will be
depreciated  on  a  straight-line  basis  over  a  period  of  five  years,  and
approximately  $30.8 million will be depreciated on a straight-line basis over a
period of eight  years.  Consequently,  this  depreciation  and other  fixed and
variable costs  associated  with the ramp-up of production of  second-generation
products are not expected to be fully absorbed until higher  production  volumes
and higher yield levels are achieved.  As a result,  gross  margins  during 1999
will  continue to be negatively  impacted  until higher  production  volumes and
higher yield levels are attained.

YEAR 2000 READINESS DISCLOSURE

     The  statements  in the  following  section  include  "Year 2000  readiness
disclosure"  within  the  meaning  of the Year 2000  Information  and  Readiness
Disclosure Act of 1998.

     Vicor has formed an internal  Year 2000  compliance  team to  evaluate  its
internal  facilities,  engineering  and  manufacturing  processes,  and business
information  systems with respect to Year 2000  compliance.  The  evaluation has
included both Information  Technology ("IT") systems and non-IT systems, and the
products and systems of the  Company's  significant  suppliers.  The Company has
initiated formal  communications with all of its significant suppliers and large
customers to determine  the extent to which the Company is  vulnerable  to those
third parties'  failures to remediate  their Year 2000 issues.  The Company does
not believe that it has any exposure to  contingencies  related to the Year 2000
Issue for the products it has sold.

     The  compliance  team is using the following  phased  approach to Year 2000
readiness:  internal  inventory,  vendor  questionnaires,  assessment,  planning
(which involves  establishing  timetables and cost  estimates),  remediation and
testing.  The  internal  inventories  for both IT and non-IT  systems  have been
completed.  Vendor questionnaires for IT and non-IT systems have been circulated
and responses have been received and reviewed.  For both IT and non-IT  systems,
there are approximately 10 critical vendors from which responses either have not
been  received or have not indicated  compliance.  The  compliance  team and the
purchasing  department are following up on the non-replies.  Both the assessment
phase  and the  planning  phase  are 90%  complete  for the IT  systems  and 50%
complete for non-IT systems. Both assessment and planning phases are expected to
be  completed  by the end of the first  quarter  of 1999.  The  remediation  and
testing  phases will commence and are expected to be completed by the end of the
first quarter of 1999 for IT systems.  The remediation  phase for non-IT systems
is expected to be completed in the second  quarter of 1999,  with testing to run
into the third quarter of 1999.

     Vicor's  current  primary  business  information  system  is  known  to  be
non-compliant  and a vendor has been  selected to assist the Company in bringing
this  system  into  compliance  by the first  quarter of 1999.  The cost of this
upgrade will not be material.  In addition,  the Company is proceeding  with the
phased  installation  of a new Enterprise  Resource  Planning (ERP) system which
will replace the upgraded,  Year 2000  compliant  primary  business  information
system.  The  installation  of the Year 2000  compliant ERP system should not be
necessary  for the Company to achieve Year 2000  compliance  with respect to its
business  information  system and such ERP system will not be fully installed by
December 31, 1999.  Phases of this  installation  have been delayed due to other
Year 2000 compliance efforts.





     The total  external  cost of the Year 2000  project is estimated to be $6.0
million,  of which a  significant  portion is for the new ERP  system.  Internal
costs are not  considered to be  incremental,  and are therefore not included in
the amount.  Of the total  project  cost,  approximately  $2.2  million  will be
capitalized for the purchase of new software and hardware enhancements,  and the
balance of $3.8 million will be expensed as incurred  through 2001, which is not
expected  to have a  material  effect  on the  results  of  operations.  Through
December  31,  1998,  the Company has  incurred  approximately  $2.7 million ($1
million expensed and $1.7 million capitalized),  of which approximately $110,000
was  incurred  in the  fourth  quarter of 1998  ($25,000  expensed  and  $85,000
capitalized).

     The  Company  presently  believes  that the Year 2000  issue  will not pose
significant operational problems.  However, the future compliance with Year 2000
processing  within Vicor is dependent on certain key personnel,  and on vendors'
equipment and internal systems. Therefore,  unresolved Year 2000 issues remain a
possibility.  As a result,  Year 2000 issues could have a significant  impact on
the Company's  operations and its financial  results if modifications  cannot be
completed on a timely basis,  unforeseen  needs or problems arise, or if systems
operated by third parties (including  municipalities and utilities) are not Year
2000 compliant.  The Company currently  believes that its most reasonably likely
worst  case  Year  2000   scenario   would  relate  to  failures  with  external
infrastructures  such  as  utilities,   telecommunications   and  transportation
systems,  over which the  Company  has  limited  control.  The  Company  has not
analyzed the potential consequences to the results of operations,  liquidity and
financial  condition,  of such a  scenario.  At  present,  the  Company  has not
developed  contingency  plans but intends to  determine  whether to develop such
plans early in fiscal 1999.

     The  estimates  and  conclusions  set  forth  herein  regarding  Year  2000
compliance  contain  forward-looking  statements  and are based on  management's
estimates of future events and information provided by third parties.  There can
be no assurance that such estimates and  information  will prove to be accurate.
Risks to completing the Year 2000 project include the availability of resources,
the Company's  ability to discover and correct  potential Year 2000 problems and
the ability of  suppliers  and other third  parties to bring their  systems into
Year 2000 compliance.





ITEM 8 - FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

INDEX

FINANCIAL STATEMENTS

Report of Independent Auditors

Consolidated Balance Sheets at December 31, 1998 and 1997

Consolidated  Statements  of Income For the Years Ended  December 31, 1998,
  1997 and 1996

Consolidated  Statements  of Cash Flows For the Years Ended  December  31, 1998,
  1997 and 1996

Consolidated Statements of Stockholders' Equity For the Years Ended December 31,
  1998, 1997 and 1996

Notes to the Consolidated Financial Statements

Schedule (Refer to Item 14)





                         REPORT OF INDEPENDENT AUDITORS


Board of Directors and Stockholders
VICOR CORPORATION

     We have  audited  the  accompanying  consolidated  balance  sheets of Vicor
Corporation  as of  December  31, 1998 and 1997,  and the  related  consolidated
statements of income, stockholders' equity, and cash flows for each of the three
years in the period  ended  December  31,  1998.  Our audits also  included  the
financial  statement schedule listed in the Index at Item 14(a). These financial
statements and schedule are the responsibility of the Company's management.  Our
responsibility  is to  express  an opinion  on these  financial  statements  and
schedule based on our audits.

     We conducted  our audits in accordance  with  generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion,  the consolidated  financial  statements  referred to above
present fairly, in all material respects, the consolidated financial position of
Vicor Corporation at December 31, 1998 and 1997, and the consolidated results of
its  operations  and its cash  flows for each of the three  years in the  period
ended  December 31, 1998,  in  conformity  with  generally  accepted  accounting
principles. Also, in our opinion, the related financial statement schedule, when
considered  in  relation  to the basic  financial  statements  taken as a whole,
presents fairly in all material respects the information set forth therein.




                                                            /s/Ernst & Young LLP

Boston, Massachusetts 
January 26, 1999, 
except for Note 13, 
as to which the date
is February 1, 1999






                                 VICOR CORPORATION
                           CONSOLIDATED BALANCE SHEETS
                           December 31, 1998 and 1997



                                                                                          1998                   1997
                                                                                          ----                   ----
                                                                                     (in thousands, except share data)
                                                                                                           
                                     ASSETS                      

Current assets:
     Cash and cash equivalents                                                         $  58,897           $  84,859
     Accounts receivable, less allowance of $955 in 1998 and
        $971 in 1997                                                                      28,245              35,258
     Inventories, net                                                                     29,470              23,448
     Other current assets                                                                  5,071               3,269
                                                                                         -------             -------
         Total current assets                                                            121,683             146,834


Property, plant and equipment, net                                                       111,074              69,802
Notes receivable                                                                           9,091               9,097
Other assets                                                                               7,703               3,110
                                                                                       ---------           ---------
                                                                                       $ 249,551           $ 228,843
                                                                                       =========           =========





                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
     Amounts due for assets acquired                                                   $  16,000           $       -
     Accounts payable                                                                      9,919               8,542
     Accrued compensation and benefits                                                     2,010               2,154
     Accrued expenses                                                                      4,001               2,741
     Income taxes payable                                                                  5,159               5,110
     Deferred revenue                                                                          -                  20
                                                                                          -------             -------
         Total current liabilities                                                        37,089              18,567


Deferred income taxes                                                                      3,203               1,852
Commitments and contingencies                                                                  -                   -

Stockholders' equity:
     Preferred Stock, $.01 par value, 1,000,000 shares
         authorized; 360,001 issued and none outstanding in 1998 and 1997                      -                   -
     Class B Common Stock: 10 votes per share, $.01 par value, 14,000,000
          shares authorized, 12,103,309 issued and outstanding
         (12,173,809 in 1997)                                                                121                 122
     Common Stock: 1 vote per share, $.01 par value, 62,000,000 shares
         authorized, 34,222,474 shares issued and 29,613,180 outstanding
         (33,958,142 issued and 30,674,748 outstanding in 1997)                              342                 340
     Additional paid-in capital                                                          100,255              97,980
     Retained earnings                                                                   166,891             151,056
     Accumulated other comprehensive income                                                  349                   -
     Treasury stock at cost: 4,609,294 shares (3,283,394 shares in 1997)                 (58,699)            (41,074)
                                                                                        --------            -------- 
     Total stockholders' equity                                                          209,259             208,424
                                                                                       ---------           ---------
                                                                                       $ 249,551           $ 228,843
                                                                                       =========           =========




                             See accompanying notes






                                VICOR CORPORATION
                        CONSOLIDATED STATEMENTS OF INCOME
                  Years ended December 31, 1998, 1997 and 1996






                                                      1998            1997         1996
                                                      ----            ----         ----
                                                  (in thousands, except per share amounts)

                                                                             
Net revenues                                        $164,634          $162,243     $144,983

Costs and expenses:
     Cost of revenue                                  90,685            78,234       66,878
     Selling, general and administrative              34,934            30,327       27,232
     Research and development                         20,650            17,732       14,341
                                                     -------           -------      -------
                                                     146,269           126,293      108,451
                                                     -------           -------      -------

Income from operations                                18,365            35,950       36,532

Other income                                           4,922             5,014        3,860
                                                     -------            -------      -------


Income before income taxes                            23,287            40,964       40,392

Provision for income taxes                             7,452            14,747       14,753
                                                       -----            ------       ------



Net income                                          $ 15,835          $ 26,217     $ 25,639
                                                    ========          ========     ========


Net income per common share:
     Basic                                          $    .37          $    .62     $    .61
                                                    ========          ========     ========
     Diluted                                        $    .37          $    .60     $    .60
                                                    ========          ========     ========

Shares used to compute net income per share:
     Basic                                            42,292            42,595       41,947
                                                    ========          ========     ========
     Diluted                                          42,785            43,344       42,764
                                                    ========          ========     ========







                             See accompanying notes





                                VICOR CORPORATION
                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                  Years ended December 31, 1998, 1997 and 1996




                                                                      1998              1997            1996
                                                                      ----              ----            ----
                                                                                    (in thousands)
                                                                                                  
Operating activities:                                       
     Net income                                                    $ 15,835          $ 26,217         $ 25,639
     Adjustments to reconcile net income to net cash
         provided by operating activities:
              Depreciation and amortization                          11,607             8,289            8,338
              (Gain) loss on disposal of equipment                      (23)              (10)               4
              Deferred income taxes                                     303              (201)             (28)
              Change in current assets and liabilities, net           3,084            (8,159)          (4,238)
                                                                      -----            ------           ------ 

                  Net cash provided by operating activities          30,806            26,136           29,715

Investing activities:
     Additions to property, plant and equipment                     (36,392)          (20,177)         (14,295)
     Proceeds from sale of equipment                                     42                20               16
     Acquisition of business                                         (1,850)                -                -
     Increase in other assets                                        (3,574)             (928)            (787)
     Decrease (increase) in notes receivable                              6            (5,302)          (1,295)
                                                                      ------           -------           ------ 

                  Net cash used in investing activities             (41,768)          (26,387)         (16,361)

Financing activities:
     Tax benefit relating to stock option plans                         718             2,950            2,844
     Proceeds from issuance of Common Stock                           1,558             9,196            5,212
     Other                                                              349                 -                -
     Acquisitions of treasury stock                                 (17,625)             (683)         (13,007)
                                                                    -------             ------          ------- 
                  Net cash provided by (used in)
                      financing activities                          (15,000)           11,463           (4,951)
                                                                    --------          --------          ------- 

Net (decrease) increase in cash and cash equivalents                (25,962)           11,212            8,403

Cash and cash equivalents at beginning of year                       84,859            73,647           65,244
                                                                   ---------         --------         ---------
Cash and cash equivalents at end of year                           $ 58,897          $ 84,859         $ 73,647
                                                                   ========          ========         =========



                           Continued on following page






                                VICOR CORPORATION
                CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued)
                  Years ended December 31, 1998, 1997 and 1996







                                                                    1998         1997             1996
                                                                    ----         ----             ----
                                                                              (in thousands)
                                                                                          
Change in current assets and liabilities:
     Accounts receivable                                         $  7,013       $(10,257)      $  1,170
     Inventories                                                   (4,447)        (2,319)        (4,444)
     Other current assets                                            (754)          (159)           260
     Accounts payable and other accrued items                       1,243          3,566         (1,378)
     Income taxes payable                                              49          1,516           (122)
     Deferred revenue                                                 (20)          (506)           276
                                                                 ----------      ---------      --------
                                                                 $  3,084       $ (8,159)      $ (4,238)
                                                                 =========      =========       ======== 

Supplemental disclosures:
     Cash paid during the year for income taxes,                 $  5,568       $  9,520       $ 10,911
     net of refunds

     Liabilities incurred related to acquisition                 $ 16,000       $      -       $      -






                             See accompanying notes









                                VICOR CORPORATION
                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                  Years ended December 31, 1998, 1997 and 1996

                      (in thousands, except share amounts)



                                                                                             Accumulated
                                               Class B              Additional                 Other                      Total
                                               Common    Common      Paid-in    Retained    Comprehensive   Treasury   Stockholders'
                                               Stock      Stock      Capital    Earnings       Income        Stock       Equity
                                               -----      -----      -------    --------       ------        -----       ------
                                                                                                   
Balance at December 31, 1995                 $123         $324      $77,793      $99,200        $-       $(27,384)      $150,056

Sales of Common Stock                                        7        5,205                                                5,212
Conversion of Class B Common
  Stock to Common Stock                                                                                                        -
Income tax benefit from
  transactions involving stock options                                2,844                                                2,844
Purchase of treasury stock                                                                                (13,007)       (13,007)
Net income for 1996                                                               25,639                                  25,639
                                          ---------    ---------    ---------    ---------   ---------   ----------     ---------
Balance at December 31, 1996                  123          331       85,842      124,839                  (40,391)       170,744

Sales of Common Stock                                        8        9,188                                                9,196
Conversion of Class B Common
  Stock to Common Stock                        (1)           1                                                                 -
Income tax benefit from
  transactions involving stock options                                2,950                                                2,950
Purchase of treasury stock                                                                                   (683)          (683)
Net income for 1997                                                               26,217                                  26,217
                                            ---------    ---------  ---------   ---------   ---------    ---------      ---------
Balance at December 31, 1997                  122          340       97,980      151,056                  (41,074)       208,424

Sales of Common Stock                                        1        1,557                                                1,558
Conversion of Class B Common
  Stock to Common Stock                        (1)           1                                                                 -
Income tax benefit from
  transactions involving stock options                                  718                                                  718
Purchase of treasury stock                                                                                (17,625)       (17,625)

Net income for 1998                                                               15,835                                  15,835
Currency translation adjustments                                                               349                           349
                                                                                                                        ---------
Comprehensive income                                                                                                      16,184

                                           ---------    ---------  ---------    ---------   ---------    ---------      ---------
Balance at December 31, 1998                 $121         $342     $100,255     $166,891      $349       $(58,699)      $209,259
                                           =========    =========  =========    =========   =========    =========      =========





                             See accompanying notes








                                VICOR CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.   SIGNIFICANT ACCOUNTING POLICIES

     DESCRIPTION OF BUSINESS
     Vicor  Corporation  (the "Company")  designs,  develops,  manufactures  and
markets modular power  converters,  power system  components,  and power systems
using a patented,  high frequency power conversion  technology  designated "zero
current  switching." The Company also licenses  certain rights to its technology
in return for ongoing royalties.  The principal markets for the power converters
and systems are large Original Equipment Manufacturers and smaller, lower volume
users which are broadly distributed across several major market areas.

     PRINCIPLES OF CONSOLIDATION
     The consolidated  financial  statements include the accounts of the Company
and its  subsidiaries.  All  intercompany  transactions  and balances  have been
eliminated upon consolidation.

     REVENUE RECOGNITION
     Revenue is recognized generally when a product is shipped. License fees are
recognized  ratably  over the period of  exclusivity  or as  additional  royalty
payments would have been required,  if greater,  or over the period in which the
Company provides  services.  Revenue from the long-term contract entered into in
1993 for the sale of automated manufacturing line equipment was recognized under
the  percentage of  completion  accounting  method  through the first quarter of
1998.  Revenues recognized from this contract were less than 10% of net revenues
in 1998, 1997 and 1996.

     FOREIGN CURRENCY TRANSLATION
     The financial statements of Vicor Japan Company,  Ltd. ("VJCL"),  for which
the  functional  currency is the Japanese  yen, have been  translated  into U.S.
dollars  in  accordance   with  FASB   Statement  No.  52,   "Foreign   Currency
Translation". All balance sheet accounts have been translated using the exchange
rate in effect at the balance  sheet date.  Income  statement  amounts have been
translated at the average  exchange  rates in effect during the year.  The gains
and losses  resulting  from the changes in exchange rates from year to year have
been reported in other  comprehensive  income.  The effect on the  statements of
income of transaction gains and losses is insignificant for all years presented.

     CASH AND CASH EQUIVALENTS
     Cash and cash  equivalents  include funds held in checking and money market
accounts  with banks and  certificates  of deposit with  maturities of less than
three months when purchased.  Cash and cash equivalents are valued at cost which
approximates  market value.  The  Company's  short-term  investments,  which are
classified as cash  equivalents  on the balance  sheet,  consist  principally of
money market  securities  which are purchased and redeemed at par. The estimated
fair value is equal to the cost of the  securities  and due to the nature of the
securities  there are no unrealized  gains or losses at the balance sheet dates.
As  of  December  31,  1998,  the  Company  has  approximately  $54  million  of
available-for-sale securities ($81 million as of December 31, 1997). The Company
has no trading securities or held-to-maturity securities.

     CONCENTRATIONS OF CREDIT RISK
     Financial  instruments that potentially  subject the Company to significant
concentrations  of credit risk consist  principally of cash and cash  equivalent
investments and trade accounts  receivable.  The Company maintains cash and cash
equivalents  and certain  other  financial  instruments  with various  financial
institutions.  Concentrations  of credit  risk with  respect  to trade  accounts
receivable  are  limited  due to the large  number of  entities  comprising  the
Company's   customer  base.   Credit  losses  have   consistently   been  within
management's expectations and have not been material.

     INTANGIBLE ASSETS 
     Intangible  assets consist  primarily of values  assigned to patents and to
the excess of cost over the assigned  value of net assets  acquired.  Intangible
assets are amortized  using the  straight-line  method over periods ranging from
five to fifteen years. Amortization expense was approximately $536,000, $301,000
and $143,000 in 1998,1997 and 1996,  respectively.  Accumulated amortization was
$1,030,000 at December 31, 1998 and $664,000 at December 31, 1997.







                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

1.   SIGNIFICANT ACCOUNTING POLICIES (Continued)

     ADVERTISING EXPENSE
     The cost of  advertising  is expensed  as  incurred.  The Company  incurred
$3,197,000,  $3,372,000,  and $2,207,000 in advertising  costs during 1998, 1997
and 1996, respectively.

     NET INCOME PER COMMON SHARE
     Basic and diluted income per share are  calculated in accordance  with FASB
Statement  No. 128,  "Earnings  per Share." All income per share amounts for all
periods have been presented,  and where appropriate,  restated to conform to the
Statement No. 128 requirements.

     USE OF ESTIMATES
     The  preparation of the financial  statements in conformity  with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that affect the amounts  reported in the financial  statements  and
accompanying notes. Actual results could differ from those estimates.

     COMPREHENSIVE INCOME
     As of January  1,  1998,  the  Company  adopted  FASB  Statement  No.  130,
"Reporting  Comprehensive  Income."  Statement No. 130 establishes new rules for
the reporting and display of comprehensive  income and its components;  however,
the  adoption of this  Statement  had no impact on the  Company's  net income or
stockholders'   equity.   Statement  No.  130  requires  the  foreign   currency
translation  adjustments  related to VJCL to be included in other  comprehensive
income.

     IMPACT OF RECENTLY ISSUED ACCOUNTING STANDARDS
     In  April  1998,  the  Accounting   Standards  Executive  Committee  issued
Statement  of  Position  ("SOP")  98-5,  "Reporting  on the  Costs  of  Start-up
Activities."  SOP 98-5 requires the costs of start-up  activities to be expensed
as incurred,  and is effective  for fiscal years  beginning  after  December 15,
1998. The Company does not believe that the adoption of this Statement will have
a material effect on the Company's financial statements.

2.   ACQUISITION

     Effective July 1, 1998, the Company and its  wholly-owned  subsidiary VJCL,
acquired the principal assets of the switching power supply  businesses owned by
the Japan Tobacco,  Inc. Group ("JT").  The assets acquired  included  automated
manufacturing  equipment,  existing raw material and finished goods inventories,
customer  lists and certain  intellectual  property.  VJCL also assumed  certain
warranty  obligations  for products  manufactured by JT prior to the acquisition
date and for a six  month  transition  period  ending  December  31,  1998.  The
acquisition  was  accounted  for by the  purchase  method.  The  total  value of
consideration  given  and  liabilities  assumed  aggregated  $19.1  million.  In
addition to cash payments for inventories, the Company has agreed to pay for the
automated  equipment  in  three  equal  installments  of $5.3  million,  through
December  31,  1999.  The total cost of the purchase in excess of the net assets
acquired of  approximately  $1.5 million is being amortized over ten years.  The
following unaudited pro forma financial information for the years ended December
31,  1998 and 1997  assumes the  acquisition  occurred as of January 1, 1998 and
1997, respectively (in thousands, except per share amounts):

                                                   1998                1997
                                                   ----                ----

Net revenues                                   $173,421            $179,816
Net income                                     $ 14,216            $ 22,980
Net income per share-diluted                      $0.33               $0.53

     The pro forma financial  information is not  necessarily  indicative of the
operating results that would have occurred had the acquisition been completed as
of January 1, 1998 and 1997,  respectively,  nor are they necessarily indicative
of future operating results.





                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

3.   INVENTORIES

     Inventories are valued at the lower of cost (determined using the first-in,
first-out method) or market. Inventories were as follows (in thousands):

                                                         December 31
                                                         -----------
                                                   1998               1997   
                                                   ----               ----   

     Raw materials                              $19,084            $16,715
     Work-in-process                              4,334              3,774
     Finished goods                               6,052              2,959
                                                -------            -------
                                                $29,470            $23,448
                                                =======            =======

4.   PROPERTY, PLANT AND EQUIPMENT

     Property,  plant and equipment are stated at cost and are  depreciated  and
amortized  over a period of 3 to 31.5 years  generally  under the  straight-line
method for financial  reporting purposes and accelerated  methods for income tax
purposes. Property, plant and equipment were as follows (in thousands):

                                                                   December 31
                                                                   -----------
                                                               1998         1997
                                                               ----         ----

Land                                                       $  2,089     $  2,089
Buildings and improvements                                   24,370       11,644
Machinery and equipment                                     107,329       58,563
Furniture and fixtures                                        4,725        3,720
Leasehold improvements                                        3,151        2,335
Building construction-in-progress                            10,616        3,160
Construction-in-progress                                     19,053       37,841
                                                            -------      -------
                                                            171,333      119,352
Less accumulated depreciation and amortization               60,259       49,550
                                                           --------     --------
                                                           $111,074     $ 69,802
                                                           ========     ========

     At December 31, 1998, the Company had  approximately  $3,100,000 of capital
expenditure commitments.

5.   NOTES RECEIVABLE

     In May 1997,  the  Company  received  a  promissory  note in the  amount of
$7,500,000 from an unrelated third party in exchange for $5,000,000 in cash plus
the termination of an existing note in the amount of $2,500,000.  The note bears
interest  at 9% and is due in May 2002.  The note is secured  by a  mortgage  on
certain real estate and by the assignment of certain leases and other contracts.

     The Company's President has borrowed a total of $1,425,393 from the Company
pursuant to a series of unsecured term notes. The notes have terms of five years
and are due at various dates through August 2002. The notes bear interest at the
higher of the Company's prime borrowing rate less 1%, or the applicable  federal
rate under the  Internal  Revenue Code of 1986,  as amended.  As of December 31,
1998, the notes and interest  receivable  balance was  approximately  $1,724,000
($1,601,000  as of  December  31,  1997)  and the  applicable  interest  rate at
December 31, 1998 was 6.75% (7.50% at December 31, 1997).

    Two  Vice-Presidents  of the Company have  borrowed a total of $111,000 from
the Company pursuant to term notes. One note for $35,000 was repaid in 1998. The
remaining notes are unsecured and bear interest at the Company's prime borrowing
rate less 1%. As of December 31, 1998, the notes and interest receivable balance
was  approximately  $39,000  ($87,000 as of December 31, 1997).  The  applicable
interest rate at December 31, 1998 was 6.75% (7.50% at December 31, 1997).





                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

6.   FINANCING ARRANGEMENTS

     The  Company  has an unused  line of  credit  with a bank  under  which the
Company may borrow up to  $4,000,000  on a revolving  credit  basis.  Borrowings
under this line would bear interest at the Company's  option of an interest rate
equal to the  Lender's  base rate,  30 day LIBOR + 1.75% or the 30 day  Banker's
Acceptance (BA) rate + 2.25%.

7.   STOCKHOLDERS' EQUITY

     In November  1997,  the Board of  Directors of the Company  authorized  the
repurchase  of  the  Company's  Common  Stock  up  to  an  aggregate  amount  of
approximately   $30,000,000,   including   amounts   remaining   under  a  prior
authorization.  The plan  authorizes the Company to make such  repurchases  from
time to time in the open market or through  privately  negotiated  transactions.
The timing of this  program and the amount of the stock that may be  repurchased
is at the  discretion of management  based on its view of economic and financial
market  conditions.  In 1998, the Company spent $17,625,000 in the repurchase of
its Common Stock.

     Common Stock

     Each share of Common Stock  entitles the holder  thereof to one vote on all
matters  submitted  to the  shareholders.  Each  share of  Class B Common  Stock
entitles the holder thereof to ten votes on all such matters.

     Shares of Class B Common Stock are not transferable by stockholders  except
to or among such stockholder's spouse, certain of such stockholder's  relatives,
and certain  other  defined  transferees.  Class B Common Stock is not listed or
traded on any exchange or in any market.  Class B Common Stock is convertible at
all times and without cost to the  shareholder  into shares of Common Stock on a
share-for-share basis.

     During 1998, a total of 193,832 shares of Common Stock were issued upon the
exercise  of stock  options,  and  70,500  shares of Class B Common  Stock  were
converted into 70,500 shares of Common Stock.

8.   INCOME PER SHARE

     The following  table sets forth the computation of basic and diluted income
per share (in thousands, except per share amounts):





                                                               1998                1997               1996
                                                               ----                ----               ----
                                                                                                                        
Numerator: 
    Net income                                                $15,835             $26,217             $25,639
                                                              =======             =======             =======

Denominator:
    Denominator for basic income per share -
    weighted average shares                                    42,292              42,595              41,947

    Effect of dilutive securities:
        Employee stock options                                    493                 749                 817
                                                                -----               -----              ------

    Denominator for diluted income per share -
    adjusted weighted-average shares and
    assumed conversions                                        42,785              43,344              42,764
                                                               ======              ======              ======
Basic income per share                                        $   .37             $   .62             $   .61
                                                              =======             =======             =======

Diluted income per share                                      $   .37             $   .60             $   .60
                                                              =======             =======             =======



     Options to purchase 663,587 shares of Common Stock were outstanding  during
1998  (20,615  in 1997  and  23,976  in  1996),  but were  not  included  in the
computation  of diluted  income per share because the options'  exercise  prices
were greater than the average  market price of the Common Stock and,  therefore,
the effect would be antidilutive.








                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)


9.   EMPLOYEE BENEFIT PLANS

     Stock Options

     The Company has elected to follow  Accounting  Principles Board Opinion No.
25,   "Accounting   for  Stock  Issued  to  Employees"   (APB  25)  and  related
Interpretations  in  accounting  for its  employee  stock  options  because,  as
discussed below,  the alternative fair value accounting  provided for under FASB
Statement No. 123,  "Accounting for Stock-Based  Compensation,"  requires use of
option  valuation  models that were not  developed  for use in valuing  employee
stock  options.  Under  APB 25,  because  the  exercise  price of the  Company's
employee stock options  equals the market price of the  underlying  stock on the
date of grant, no compensation expense is recognized.

     Under the Company's 1998 Stock Option and Incentive Plan (the "1998 Plan"),
the Board of Directors or the  Compensation  Committee  may grant  certain stock
incentive awards based on the Company's  Common Stock,  including stock options,
stock appreciation rights,  restricted stock,  performance shares,  unrestricted
stock,  deferred stock and dividend equivalent rights.  Awards may be granted to
employees and other key persons,  including  non-employee  directors.  Incentive
stock  options may be granted to employees at a price at least equal to the fair
market  value  per  share  of  the  Common  Stock  on the  date  of  grant,  and
non-qualified  options may be granted to  non-employee  directors  at a price at
least  equal to 85% of the fair market  value of the Common Stock on the date of
grant.  A total of  2,000,000  shares of Common  Stock  have been  reserved  for
issuance  under the 1998 Plan.  The period of time during which an option may be
exercised  and the  vesting  periods  will  be  determined  by the  Compensation
Committee.  The term of each  option  may not  exceed ten years from the date of
grant. As of December 31, 1998, no stock incentive awards were granted under the
1998 Plan.

     Under the 1993 Stock Option Plan (the "1993 Plan"),  the Board of Directors
or  the  Compensation  Committee  may  grant  stock  options  to  employees  and
non-employee  directors  to purchase  shares of Common Stock at a price at least
equal to the fair market value per share of the outstanding  Common Stock at the
time the option is granted.  Both  incentive  stock options  intended to qualify
under Section 422 of the Internal Revenue Code and  non-qualified  stock options
have been  authorized to be granted.  Incentive  stock options may be granted to
employees,   including   employees  who  are  directors  of  the  Company,   and
non-qualified  options may be granted to non-employee  directors.  Both employee
directors and non-employee  directors  automatically  receive stock options upon
election or  re-election  as a director.  A total of 4,000,000  shares of Common
Stock have been  reserved for issuance  under the 1993 Plan.  Stock  options are
typically  granted  with  vesting  periods and become  exercisable  over various
periods of time,  ranging  from six months to five years from the date of grant,
and expire over various periods of time,  ranging from one to ten years from the
date of grant.

     Under the  Company's  1984 Stock Option Plan, as amended (the "1984 Plan"),
the Board of Directors or the  Compensation  Committee  granted stock options to
employees  to purchase  shares of Common  Stock at a price at least equal to the
fair  market  value per share of the  outstanding  Common  Stock at the time the
option was granted.  Stock  options under the 1984 Plan were  typically  granted
with  vesting  periods  and became  exercisable  over  various  periods of time,
ranging  from six months to five years from the date of grant,  and expire  over
various  periods of time,  ranging  from one to thirteen  years from the date of
grant.  In connection with the adoption of the 1993 Plan, the Board of Directors
terminated the granting of options under the 1984 Plan upon approval of the 1993
Plan, discussed above.



                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

9. EMPLOYEE BENEFIT PLANS (Continued)

Activity as to stock options is as follows:



                                                                       1998             1997               1996               
                                                                       ----             ----               ----               

                                                                                                   
     Outstanding at beginning of year                               2,197,852        2,022,005          2,354,480
         Granted                                                      841,934        1,106,302            943,426
         Forfeited and expired                                       (221,297)        (197,448)          (587,125)
         Exercised                                                   (193,832)        (733,007)          (688,776)
                                                                     --------         --------           -------- 

     Outstanding at end of year                                     2,624,657        2,197,852          2,022,005
                                                                    =========        =========          =========

     Exercisable at end of year                                     1,650,164        1,336,125          1,552,672
                                                                    =========        =========          =========

     Weighted - average exercise price:
         Outstanding at beginning of year                              $11.15           $ 8.97              $ 8.01
         Granted                                                       $25.72           $16.92              $14.97
         Forfeited and expired                                         $21.05           $15.49              $16.73
         Exercised                                                     $ 8.10           $12.55              $ 7.56
         Outstanding at end of year                                    $15.29           $11.15              $ 8.97
         Exercisable at end of year                                    $12.33           $ 7.60              $ 7.24

     Weighted - average fair value of
         options granted during the year                          $     13.71     $       6.74        $       4.38
     Price range per share of outstanding options                 $ .84-31.13     $  .84-30.19        $  .84-24.50
                                                                  ===========     ============        ============
     Price range per share of options granted                     $8.06-28.50     $13.38-30.19        $14.38-24.50
                                                                  ===========     ============        ============
     Price range per share of options exercised                   $8.00-29.56     $ 1.00-24.38        $  .15-19.56
                                                                  ===========     ============        ============
     Available for grant at end of year                             2,468,312        1,088,996           2,002,247
                                                                  ===========     ============        ============





The weighted - average  contractual life for options  outstanding as of December
31, 1998 is 5.53 years.

The following table summarizes information about stock options outstanding as of
December 31, 1998:


                                                             Range of Exercise Prices                    
                                                              ------------------------                    

                                         $.84-$3.16         $3.38-$11.13         $11.25-$18.13         $18.38-$31.13
                                         ----------         ------------         -------------         -------------
                                                                                                   
Options Outstanding:
- --------------------
Number Outstanding                          501,488              458,452               883,902               780,815
Weighted-Average Remaining
     Contractual Life                          2.53                 5.51                  6.38                  6.49
Weighted-Average
     Exercise Price                           $1.63                $8.35                $16.03                $27.32

Options Exercisable:
- --------------------
Number Exercisable                          501,488              350,129               444,297               354,250
Weighted-Average
     Exercise Price                           $1.63                $7.75                $15.95                $27.46





                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

9.   EMPLOYEE BENEFIT PLANS (Continued)

     Pro forma  information  regarding  net  income  and  earnings  per share is
required by Statement  No. 123,  which also  requires  that the  information  be
determined  as if the Company  had  accounted  for its  employee  stock  options
granted  subsequent  to December  31,  1994 under the fair value  method of that
Statement.  The fair value for these  options was estimated at the date of grant
using a Black-Scholes  option pricing model with the following  weighted-average
assumptions for 1998, 1997 and 1996,  respectively:  risk-free interest rates of
5.3%, 6.1% and 5.4%; dividend yields of zero;  volatility factor of the expected
market  price  of the  Company's  common  stock  of  .55,  .52  and  .54;  and a
weighted-average expected life of the option of 3.4, 3.3 and 1.7 years.

     The  Black-Scholes   option  valuation  model  was  developed  for  use  in
estimating the fair value of traded  options which have no vesting  restrictions
and are fully  transferable.  In addition,  option  valuation models require the
input of highly  subjective  assumptions  including  the  expected  stock  price
volatility.  Because the Company's  employee stock options have  characteristics
significantly different from those of traded options, and because changes in the
subjective input assumptions can materially  affect the fair value estimate,  in
management's  opinion, the existing models do not necessarily provide a reliable
single measure of the fair value of its employee stock options.

     For  purposes of pro forma  disclosures,  the  estimated  fair value of the
options is amortized to expense over the options' vesting period.  The Company's
pro forma  information  follows  (in  thousands  except for  earnings  per share
information):




                                                  1998           1997            1996
                                                  ----           ----            ----
                                                                           
Pro forma net income                           $12,964         $23,947          $23,658

Pro forma net income per share:
      Basic                                    $   .31         $   .56          $   .56
      Diluted                                  $   .30         $   .55          $   .55



     The effects on 1998,  1997 and 1996 pro forma net income and net income per
share of expensing  the fair value of stock options  issued are not  necessarily
representative  of the effects on reporting  the pro forma results of operations
for future  years as the  periods  presented  include  only four,  three and two
years, respectively, of option grants under the Company's plans.

     401(k) Plan

     The Company  sponsors a savings plan  available  to all domestic  employees
which qualifies under Section 401(k) of the Internal Revenue Code. Employees may
contribute  to the  plan  from 1% to 20% of  their  pre-tax  salary  subject  to
statutory limitations. The Company does not make contributions to this plan.

     Stock Bonus Plan

     Under the  Company's  1985 Stock Bonus Plan,  as amended,  shares of Common
Stock may be awarded to employees  from time to time as  determined by the Board
of Directors.  At December 31, 1998,  109,964  shares were available for further
award.  All shares awarded to employees  under this plan have vested in full. No
further awards are contemplated under this plan at present.






                                VICOR CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (Continued)

10.  INCOME TAXES

     Deferred income taxes reflect the net tax effects of temporary  differences
between the carrying  amounts of assets and liabilities for financial  reporting
purposes and the amounts used for income tax purposes. Significant components of
the Company's deferred tax liabilities and assets are as follows (in thousands):



                                                                December 31
                                                              1998        1997
                                                              ----        ----
  
                                                                  
Deferred tax assets:
    Inventory reserves                                      $ 1,418     $ 1,058
    Vacation                                                    665         544
    Investment tax credit carryforward                          500           -
    Bad debt                                                    393         400
    Other                                                       411         337
                                                              ------       -----
         Total deferred tax assets (current)                  3,387       2,339
Deferred tax liabilities:
    Depreciation                                             (1,819)       (682)
    Patent amortization                                      (1,384)     (1,170)
                                                             ------      ------ 
         Total deferred tax liabilities (noncurrent)         (3,203)     (1,852)
                                                             ------      ------ 
         Net deferred tax assets                            $   184     $   487
                                                            =======     =======



     Significant components of the provision for income taxes are as follows (in
thousands):




                                            1998          1997            1996
                                            ----          ----            ----
                                                                   
Federal:
    Current                               $  6,573      $ 12,877       $ 12,662
    Deferred (prepaid)                         303          (201)           (28)
                                            -------      -------         ------- 
                                             6,876        12,676         12,634
State:
    Current                                    576         2,071          2,119
                                          --------      --------       ---------
                                          $  7,452      $ 14,747       $ 14,753
                                          ========      ========       =========



     The  reconciliation  of the federal  statutory rate to the effective income
tax rate is as follows:



                                                               1998      1997      1996
                                                               ----      ----      ----
                                                                              
Statutory federal tax rate                                     35.0%      35.0%    35.0%
State income taxes, net of federal income tax benefit           1.6        3.3      3.5
Tax credits                                                    (4.7)      (0.8)    (0.6)
Foreign Sales Corporation benefit                              (1.1)      (1.5)    (1.4)
Other                                                           1.2          -        -
                                                               -----      -----    -----          
                                                               32.0%      36.0%    36.5%
                                                              ======      =====    ===== 


11.  COMMITMENTS AND CONTINGENCIES

     The Company leases  certain of its office,  warehousing  and  manufacturing
space, as well as certain equipment. The future minimum rental commitments under
noncancelable operating leases with remaining terms in excess of one year are as
follows (in thousands):










                                VICOR CORPORATION
              NOTES TO CONSOLIDATED FINANCIAL STATEMENTS(Continued)

11. COMMITMENTS AND CONTINGENCIES (Continued)

    Year
    ----
     1999                                         $1,516
     2000                                            614
     2001                                            210
     2002                                            146
     2003                                             79

     Rent expense was approximately  $1,534,000,  $1,383,000,  and $1,329,000 in
1998, 1997 and 1996, respectively. The Company also pays executory costs such as
taxes, maintenance and insurance.

     The Company is involved in certain litigation  incidental to the conduct of
its  business.  While the  outcome of lawsuits  against  the  Company  cannot be
predicted with certainty,  management does not expect any current  litigation to
have a material adverse effect on the Company.

12.  SEGMENT INFORMATION

     The Company operates in one industry segment: the development,  manufacture
and sale of power conversion components and systems. During 1998, 1997 and 1996,
no  customer  constituted  more than 10% of net  revenues.  Export  sales,  as a
percentage of total revenue,  were approximately 29%, 31%, and 30% in 1998, 1997
and 1996,  respectively.  Export sales and receipts are recorded and received in
U.S.  dollars.  Foreign  exchange  fluctuations  have not been  material  to the
Company's operating results during the last three years.

13.  LICENSE AGREEMENT AND LITIGATION SETTLEMENT

     On February 1, 1999, the Company and Reltec Corporation  ("Reltec") entered
into a license agreement under which Reltec acquired a non-exclusive,  worldwide
license to use Vicor's patented "reset"  technology.  Concurrently,  the Company
and Reltec  agreed to settle all pending  litigation  and  disputes  relating to
Reltec's past use of certain Vicor intellectual  property.  In consideration for
the license and the separate  settlement of the  litigation,  Reltec will make a
one-time  payment of $22.5  million into an escrow  fund.  Vicor is obligated to
make  know-how and technical  support  available to Reltec under the license and
will receive and recognize income from the escrow fund through the year 2001.

14.  QUARTERLY RESULTS OF OPERATIONS (Unaudited)

     The following table sets forth certain unaudited  quarterly  financial data
(in thousands, except per share amounts):



                                        First         Second          Third          Fourth          Total
                                        -----         ------          -----          ------          -----
                                                                                            
1998:    Net revenues                 $43,192        $41,718        $39,318        $40,406        $164,634
         Gross profit                  20,747         18,840         17,233         17,129          73,949
         Net income                     5,415          4,155          3,042          3,223          15,835
         Net income per share:
             Basic                        .13            .10            .07            .08             .37
             Diluted                      .12            .10            .07            .08             .37




                                        First         Second          Third          Fourth          Total
                                        -----         ------          -----          ------          -----
                                                                                       
1997:    Net revenues                 $37,939        $39,718        $41,400        $43,186        $162,243
         Gross profit                  20,062         20,416         21,433         22,098          84,009
         Net income                     5,976          6,363          7,130          6,748          26,217
         Net income per share:
             Basic                        .14            .15            .17            .16             .62
             Diluted                      .14            .15            .16            .15             .60






ITEM 9 -  CHANGES  IN AND  DISAGREEMENTS  WITH  ACCOUNTANTS  ON  ACCOUNTING  AND
          FINANCIAL DISCLOSURE

     None.

                             
PART III

ITEM 10 - DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     Incorporated by reference from the Company's Definitive Proxy Statement for
its 1999 annual meeting of stockholders.

ITEM 11 - EXECUTIVE COMPENSATION

     Incorporated by reference from the Company's Definitive Proxy Statement for
its 1999 annual meeting of stockholders.

ITEM 12 - SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     Incorporated by reference from the Company's Definitive Proxy Statement for
its 1999 annual meeting of stockholders.

ITEM 13 - CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     Incorporated by reference from the Company's Definitive Proxy Statement for
its 1999 annual meeting of stockholders.

ITEM 14 - FINANCIAL STATEMENTS, SCHEDULES, EXHIBITS, AND REPORTS ON FORM 8-K

(a) (1) FINANCIAL STATEMENTS

     See index in Item 8

(a)  (2) SCHEDULES

     Schedule II Valuation and Qualifying Accounts

     All  other  schedules  for  which  provision  is  made  in  the  applicable
accounting regulation of the Securities and Exchange Commission are not required
under the related  instructions  or are  inapplicable,  and therefore  have been
omitted.






ITEM 14 - FINANCIAL  STATEMENTS,  SCHEDULES,  EXHIBITS,  AND REPORTS ON FORM 8-K
(continued)

(a) (3) EXHIBITS

     Exhibits     Description of Document

        3.1     o Restated Certificate of Incorporation*
        3.2     o Bylaws, as amended*
        4.1     o Specimen Common Stock Certificate*
       10.1     o 1984 Stock Option Plan of the Company, as amended*
       10.2     o Lease dated December 30, 1989, by and between the Company and 
                  David J. Carlberg and Paul Bruk,  Jr., as Trustees of Frontage
                  Road  Realty  Trust,  relating  to the  corporate  offices and
                  manufacturing facilities at 23 Frontage Road, as amended*
       10.3     o Military/Aerospace License Agreement dated as of March 1,1985,
                  by and between the Company and Kollmorgen Corporation*
       10.4     o Western Europe License  Agreement dated as of March 1, 1985,
                  by and between the Company and Kollmorgen Corporation*
       10.5     o Switching Power Supply Patents and Know-How  Agreement dated
                  as of  December  2,  1986,  by and  between  the  Company  and
                  Reliance Electric Company*
       10.6     o Switching  Power  Supply  Patent and  Information  Agreement
                  dated as of June 29, 1988, by and between VLT  Corporation and
                  Integran, Inc.*
       10.7     o Vicor Corporation Employee Stock Bonus Plan*
       10.8     o Vicor Corporation 401(k) Plan*
       10.9     o Amendment to Switching Power Supply Patents and Know-How 
                  Agreement  dated as of May 17, 1990, by and among the Company,
                  VLT Corporation and Reliance Comm/Tec Corporation**
       10.10    o $1,500,000 Promissory Note (Lot 3) to Vicor Corporation from 
                  Andover Park Realty Trust dated September 14, 1992***
       10.11    o $1,500,000 Promissory Note (Lot 2) to Vicor Corporation from 
                  Andover Park Realty Trust dated September 14, 1992***
       10.12    o $1,000,000 Promissory Note (Lot 6A) to Vicor Corporation from 
                  Andover Park Realty Trust dated September 14, 1992***
       10.13    o Mortgage and Security Agreement (Lot 6A) to Vicor Corporation 
                  from Andover Park Realty Trust dated September 14, 1992*** 
       10.14    o 1993 Stock Option Plan****
       10.15    o $7,500,000 Promissory Note to Vicor Corporation from Andover 
                  Park Realty Trust dated May 29,1997*****
       10.16    o Loan Agreement between Vicor Corporation and Andover Park 
                  Realty Trust dated May 29, 1997*****
       10.17    o Mortgage and Security Agreement to Vicor Corporation from 
                  Andover Park Realty Trust dated May 29, 1997*****
       10.18    o 1998 Stock Option and Incentive Plan******
       21.1     o Subsidiaries of the Company (1)
       23.1     o Consent of Independent Auditors (1)
       27.1     o Financial Data Schedule for 1998 (1)

                * Filed as an exhibit to the Company's Registration Statement on
                  Form 10, as amended, under the Securities Exchange Act of 1934
                  (File No. 0-18277), and incorporated herein by reference.
               ** Filed as an exhibit  to the  Company's  Annual  Report on Form
                  10-K  for  the  fiscal  year  ended   December  31,  1990  and
                  incorporated herein by reference.
              *** Filed as an exhibit to the  Company's  Current  Report on Form
                  8-K  dated  September  14,  1992 and  incorporated  herein  by
                  reference.
             **** Filed as an exhibit to the Company's Registration Statement 
                  on Form S-8, as amended, under the Securities Act of  1933 
                  (No. 33-65154), and incorporated herein by reference.
            ***** Filed as an exhibit to the Company's  Form 10-Q dated June 30,
                  1997 and incorporated herein by reference.
           ****** Filed as an exhibit to the Company's Registration Statement 
                  on Form S-8, as amended, under the Securities Act of 1933
                  (No. 333-61177), and incorporated herein by reference.
              (1) Filed herewith

(b) REPORTS ON FORM 8-K
     None







                                VICOR CORPORATION
                                   SCHEDULE II
                        Valuation and Qualifying Accounts
                  Years ended December 31, 1998, 1997 and 1996





                                                            (Credit)
                                     Balance at             Charge to             Other               Balance at
                                     Beginning              Costs and            Changes                 End
                                     Of Period              Expenses             Deductions (1)       Of Period
                                     ---------              --------             --------------       ---------
                                                                                              
1998                       

Allowance for doubtful
     accounts                         $971,000             $ 11,000             ($27,000)             $955,000

1997                                                                                                          

Allowance for doubtful
     accounts                         $879,000             $  5,000             $ 87,000              $971,000

 1996                                                                                                         

Allowance for doubtful
     accounts                         $786,000             $ 10,000             $ 83,000              $879,000


(1) Reflects uncollectible accounts written off, net of recoveries.






                                   SIGNATURES

     Pursuant  to the  requirements  of  Section  13 or 15(d) 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.




Dated: March 24, 1999                                Vicor Corporation

                                                 By: /s/Mark A. Glazer     
                                                 -----------------------
                                                     Mark A. Glazer
                                                     Chief Financial Officer



     Pursuant to the  requirements of the Securities  Exchange Act of 1934, this
report  has  been  signed  below  by the  following  persons  on  behalf  of the
registrant in the capacities and on the dates indicated.

  Signature                              Title                    Date


/s/Patrizio Vinciarelli         President and Chairman       March 24, 1999
- ------------------------        of the Board (Principal
Patrizio Vinciarelli            Executive Officer)



/s/Mark A. Glazer               Chief Financial Officer      March 24, 1999
- ------------------------  
Mark A. Glazer


/s/Estia J. Eichten             Director                     March 24, 1999
- ------------------------
Estia J. Eichten


/s/David T. Riddiford           Director                     March 24, 1999
- ------------------------
David T. Riddiford


/s/Jay M. Prager                Director                     March 24, 1999
- ------------------------
Jay M. Prager


/s/M. Michael Ansour            Director                     March 24, 1999
- -----------------------
M. Michael Ansour