<PAGE>

                       Securities and Exchange Commission
                             Washington, D.C. 20549

                                    FORM 10-K

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

                   For the fiscal year ended December 31, 1999
                                       OR

            [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                       THE SECURITIES EXCHANGE ACT OF 1934
           For the transition period from             to
                                          ----------     ----------


                         Commission File number 0-19251

                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1990-B, LTD.
                    (Exact name of registrant as specified in
                     its Certificate of Limited Partnership)

         TEXAS                                    76-0307500
(State of Organization)                 (I.R.S. Employer Identification No.)


                         16825 Northchase Dr., Suite 400
                              Houston, Texas 77060
                                 (281) 874-2700
          (Address and telephone number of principal executive offices)


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

           Securities registered pursuant to Section 12(g) of the Act:
                       32,590.02 Limited Partnership Units

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  periods that the  registrant  was
required),  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 ]

Registrant does not have an aggregate  market value for its Limited  Partnership
Interests.

                       Documents Incorporated by Reference

Document                                                      Incorporated as to

    Registration Statement No. 33-15998                         Items 1 and 13
     on Form S-1



<PAGE>


                                TABLE OF CONTENTS

                             Form 10-K Annual Report
                     For the Period Ended December 31, 1999

                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1990-B, LTD.
<TABLE>
<CAPTION>

ITEM NO.                             PART I                                  PAGE
--------                             ------                                  ----
<S>                 <C>                                                      <C>

   1                Business                                                 I-1
   2                Properties                                               I-5
   3                Legal Proceedings                                        I-7
   4                Submission of Matters to a Vote of
                      Security Holders                                       I-7


                                     PART II
                                     -------

   5                Market Price of and Distributions on the
                      Registrant's Units and Related Limited
                      Partner Matters                                        II-1
   6                Selected Financial Data                                  II-2
   7                Management's Discussion and Analysis of
                      Financial Condition and Results of Operations          II-2
   8                Financial Statements and Supplementary Data              II-4
   9                Disagreements on Accounting and Financial
                      Disclosure                                             II-4


                                     PART III
                                     --------

  10                Directors and Executive Officers of the
                      Registrant                                             III-1
  11                Executive Compensation                                   III-2
  12                Security Ownership of Certain Beneficial
                      Owners and Management                                  III-2
  13                Certain Relationships and Related Transactions           III-2


                                     PART IV
                                     -------

  14                Exhibits, Financial Statement Schedules
                     and Reports on Form 8-K                                 IV-1


                                     OTHER
                                     -----

                    Signatures
</TABLE>



<PAGE>


          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.

                                     PART I

Item 1.  Business

General Description of Partnership

         Swift Energy Managed Pension Assets Partnership  1990-B,  Ltd., a Texas
limited  partnership (the "Partnership" or the  "Registrant"),  is a partnership
formed under a public serial  limited  partnership  offering  denominated  Swift
Energy Managed  Pension Assets Fund I  (Registration  Statement No.  33-15998 on
Form S-1, originally declared effective November 13, 1987, and amended effective
November  3,  1988,   August  4,  1989  and  May  1,  1990  [the   "Registration
Statement"]). The Partnership was formed effective June 30, 1990 under a Limited
Partnership Agreement dated June 30, 1990. The initial 345 limited partners made
capital contributions of $3,259,002.

         The  Partnership  is  principally  engaged in the business of acquiring
nonoperating  interests  (i.e.,  net profits  interests,  royalty  interests and
overriding  royalty  interests)  in proven  oil and gas  properties  within  the
continental United States. The Partnership does not acquire working interests in
or operate oil and gas properties,  and does not engage in drilling  activities.
At December 31, 1999, the  Partnership  had expended or committed to expend 100%
of the limited partners' net commitments  (i.e.,  limited partners'  commitments
available  to  the  Partnership  for  property  acquisitions  after  payment  of
organizational  fees  and  expenses)  in  the  acquisition  and  development  of
nonoperating  interests in producing properties,  which properties are described
under Item 2,  "Properties,"  below. The Partnership's  income is derived almost
entirely from its nonoperating interests and the disposition thereof.

         The  Partnership's  business and affairs are  conducted by its Managing
General  Partner,  Swift Energy  Company,  a Texas  corporation  ("Swift").  The
Partnership's Special General Partner, VJM Corporation, a California corporation
("VJM"), consults with and advises Swift as to certain financial matters.

         The  general  manner in which  the  Partnership  acquires  nonoperating
interests  and  otherwise  conducts  its  business is described in detail in the
Registration Statement under "Proposed Activities," which is incorporated herein
by reference.  The following is intended only as a summary of the  Partnership's
manner of doing business and specific activities to date.

Liquidation

      During the first  quarter of 2000,  the Managing  General  Partner  mailed
proxy material to the limited partners  proposing to sell all the  Partnership's
nonoperating  interests in oil and gas properties and dissolve and liquidate the
Partnership.   If  this  proposal  is  approved,  it  is  anticipated  that  the
liquidation of the Partnership will be  substantially  completed within the next
two years.

Manner of  Acquiring  Nonoperating  Interests  in  Properties;  Net  Profits and
      Overriding Royalty Interest Agreement

         The nonoperating  interests owned by the Registrant have typically been
acquired  pursuant to a Net Profits and Overriding  Royalty  Interest  Agreement
dated June 30, 1990 (the "NP/OR  Agreement")  between the  Registrant  and Swift
Energy Income Partners 1990-B, Ltd. (the "Operating Partnership"). The Operating
Partnership  is a Texas  limited  partnership  that is also managed by Swift and
VJM. The Operating  Partnership was formed to acquire and develop  producing oil
and gas properties.

         Under the NP/OR Agreement, the Registrant and the Operating Partnership
have, in effect,  combined their funds to acquire  producing  properties.  Using
funds  committed to the NP/OR  Agreement  by both  partnerships,  the  Operating
Partnership  acquires producing  properties,  then promptly conveys nonoperating
interests therein to the Registrant. The Operating Partnership retains a working
interest in each such property, and is responsible for the production of oil and
gas therefrom. For the sake of legal and administrative  convenience,  producing
properties  are usually  acquired from the third party  sellers by Swift,  which
then  conveys  a  working  interest  in  each  such  property  to the  Operating
Partnership.  The Registrant  initially  committed  $2,799,788 and the Operating
Partnership  initially  committed  $3,152,626 for  acquisitions  under the NP/OR
Agreement.  The Operating  Partnership is obligated under the NP/OR Agreement to
convey to the  Registrant  a 47%  fixed  net  profits  interest  and a  variable
overriding  royalty  interest in specified  depths of all  producing  properties
acquired under the NP/OR Agreement.

                                      I-1


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


         Under the NP/OR  Agreement,  the Operating  Partnership  is required to
convey  to  the  Registrant,   and  the  Registrant  is  required  to  purchase,
nonoperating  interests in all  producing  properties  acquired by the Operating
Partnership, except that:

                  1. properties  anticipated to require significant  development
operations and nonoperating  interests  offered to the Operating  Partnership by
third  parties may be purchased by the Operating  Partnership  outside the NP/OR
Agreement, without participation by the Registrant;

                  2. during a  specified  one-year  period,  the  Registrant  is
entitled to reduce the amount originally  committed by it to purchases under the
NP/OR  Agreement  and to redirect  such funds to the  purchase  of  nonoperating
interests from sources other than the Operating Partnership; and

                  3. the  Registrant's  funds  will be  released  from the NP/OR
Agreement if they are not completely spent by the Operating Partnership within a
specified  period,  or if there is a prior  withdrawal of funds by the Operating
Partnership  to  purchase   properties   anticipated   to  require   significant
development.

         Purchases of nonoperating  interests by the Registrant  using withdrawn
or  released  funds  may be made  from  the  Managing  General  Partner  and its
affiliates,   other  partnerships  affiliated  with  the  Operating  Partnership
(possibly through the Registrant's  entry into a new NP/OR  Agreement),  or from
unaffiliated third parties.

         In accordance with its  obligations  under the NP/OR  Agreement,  as of
December 31, 1999,  the Operating  Partnership  had conveyed to the Registrant a
47% net profits interest  burdening  certain depths of all producing  properties
acquired  by the  Operating  Partnership  thereunder.  Typically,  a net profits
interest in an oil and gas property entitles the owner to a specified percentage
share of the gross proceeds generated by the burdened property, net of operating
costs.  The net  profits  interest  conveyed to the  Registrant  under the NP/OR
Agreement differs from the typical net profits interest in that it is calculated
over  the  entire  group  of  producing  properties  conveyed  under  the  NP/OR
Agreement; i.e., all operating costs attributable to the burdened depths of such
properties are  aggregated,  and the total is then  subtracted from the total of
all gross  proceeds  attributable  to such depths in order to calculate  the net
profits to which the Registrant is entitled.  The net profits interest  conveyed
to the Registrant  burdens only those depths of each subject property which were
evaluated to contain proved reserves at the date of  acquisition,  to the extent
such depths underlie specified surface acreage.

         The Operating Partnership has also conveyed to the Registrant under the
NP/OR  Agreement  an  overriding  royalty  interests in each  property  acquired
thereunder. An overriding royalty interest is a fractional interest in the gross
production  (or the gross  proceeds  therefrom)  of oil and gas from a property,
free of any exploration,  development,  operation or maintenance expenses. Under
the NP/OR  Agreement,  the overriding  royalty  interest burdens the portions of
each producing  property that were  evaluated at the date of acquisition  not to
contain proved reserves.

Competition, Markets and Regulations

         Competition

         The oil and gas industry is highly  competitive in all its phases.  The
Partnership encounters strong competition from many other oil and gas producers,
many of which possess substantial financial resources, in acquiring economically
desirable Producing Properties.

         Markets

         The amounts of and price  obtainable  for oil and gas  production  from
Partnership  Properties will be affected by market factors beyond the control of
the  Partnership.  Such factors include the extent of domestic  production,  the
level of imports of foreign oil and gas, the general level of market demand on a
regional, national and worldwide basis, domestic and foreign economic conditions
that  determine  levels of industrial  production,  political  events in foreign
oil-producing  regions, and variations in governmental  regulations and tax laws
and  the  imposition  of new  governmental  requirements  upon  the  oil and gas
industry. There can be no assurance that oil and gas prices will not decrease in
the future, thereby decreasing net Revenues from Partnership Properties.

                                      I-2


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


         From time to time,  there may exist a  surplus  of  natural  gas or oil
supplies,  the effect of which may be to reduce the amount of hydrocarbons  that
the  Partnerships  may produce and sell while such oversupply  exists.  Over the
past  year,   initial   steps  have  been  taken  to  provide   additional   gas
transportation  lines from Canada to the United States.  If additional  Canadian
gas is brought to the United States market, it could create downward pressure on
United States gas prices.

         Regulations

         Environmental Regulation

         The federal  government  and various state and local  governments  have
adopted  laws and  regulations  regarding  the control of  contamination  of the
environment.  These laws and regulations may require the acquisition of a permit
by Operators before drilling commences,  prohibit drilling activities on certain
lands  lying  within  wilderness  areas or where  pollution  arises  and  impose
substantial  liabilities for pollution  resulting from operations,  particularly
operations near or in onshore and offshore waters or on submerged  lands.  These
laws and  regulations  may also  increase  the  costs of  routine  drilling  and
operation of wells.  Because these laws and regulations change  frequently,  the
costs to the  Partnership of compliance  with existing and future  environmental
regulations cannot be predicted.  However, the Managing Partner does not believe
that the  Partnership is affected in a significantly  different  manner by these
regulations than are its competitors in the oil and gas industry.

         Federal Regulation of Natural Gas

         The  transportation  and sale of natural gas in interstate  commerce is
heavily  regulated  by  agencies  of  the  federal  government.   The  following
discussion is intended only as a summary of the principal statutes,  regulations
and  orders  that  may  affect  the  production  and  sale of  natural  gas from
Partnership  Properties.  This  summary  should not be relied upon as a complete
review of applicable natural gas regulatory provisions.

         FERC Orders

         Several major  regulatory  changes have been implemented by the Federal
Energy Regulatory  Commission  ("FERC") from 1985 to the present that affect the
economics of natural gas production,  transportation and sales. In addition, the
FERC  continues  to  promulgate  revisions  to various  aspects of the rules and
regulations  affecting  those  segments of the natural gas industry  that remain
subject to the FERC's jurisdiction. In April 1992, the FERC issued Order No. 636
pertaining to pipeline restructuring. This rule requires interstate pipelines to
unbundle  transportation  and sales services by separately  stating the price of
each service and by providing  customers  only the particular  service  desired,
without  regard to the source for  purchase of the gas.  The rule also  requires
pipelines to (i) provide  nondiscriminatory  "no-notice"  service  allowing firm
commitment  shippers to receive  delivery of gas on demand up to certain  limits
without  penalties,  (ii) establish a basis for release and reallocation of firm
upstream  pipeline  capacity  and  (iii)  provide  non-discriminatory  access to
capacity by firm  transportation  shippers on a  downstream  pipeline.  The rule
requires interstate  pipelines to use a straight fixed variable rate design. The
rule imposes these same requirements upon storage facilities.

         FERC Order No. 500  affects the  transportation  and  marketability  of
natural gas.  Traditionally,  natural gas has been sold by producers to pipeline
companies,  which then  resold the gas to  end-users.  FERC Order No. 500 alters
this market structure by requiring  interstate  pipelines that transport gas for
others to provide  transportation  service to  producers,  distributors  and all
other shippers of natural gas on a nondiscriminatory, "first-come, first-served"
basis ("open access  transportation"),  so that producers and other shippers can
sell natural gas directly to end-users.  FERC Order No. 500 contains  additional
provisions intended to promote greater competition in natural gas markets.

         It is not anticipated  that the  marketability  of and price obtainable
for natural gas production from  Partnership  Properties  will be  significantly
affected  by FERC  Order No.  500.  Gas  produced  from  Partnership  Properties
normally  will be sold to  intermediaries  who have entered into  transportation
arrangements with pipeline companies.  These  intermediaries will accumulate gas
purchased from a number of producers and sell the gas to end-users  through open
access pipeline transportation.

                                      I-3

<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


         State Regulations

         Production  of any oil  and gas  from  Partnership  Properties  will be
affected  to some  degree  by  state  regulations.  Many  states  in  which  the
Partnership will operate have statutory provisions regulating the production and
sale  of oil  and  gas,  including  provisions  regarding  deliverability.  Such
statutes, and the regulations promulgated in connection therewith, are generally
intended to prevent  waste of oil and gas and to protect  correlative  rights to
produce  oil and  gas  between  owners  of a  common  reservoir.  Certain  state
regulatory  authorities  also  regulate  the amount of oil and gas  produced  by
assigning allowable rates of production to each well or proration unit.

         Federal Leases

         Some of the Partnership's properties are located on federal oil and gas
leases  administered by various federal  agencies,  including the Bureau of Land
Management.   Various  regulations  and  orders  affect  the  terms  of  leases,
exploration and development plans, methods of operation and related matters.

         Employees

         The  Partnership  has no  employees.  Swift,  however,  has a staff  of
geologists,   geophysicists,   petroleum  engineers,   landmen,  and  accounting
personnel who  administer  the  operations of Swift and the  Partnership.  As of
December 31, 1999, Swift had 173 employees.  Swift's administrative and overhead
expenses  attributable  to  the  Partnership's   operations  are  borne  by  the
Partnership.

                                      I-4


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


Item 2.  Nonoperating Interests in Properties

         As of December  31, 1999,  the  Partnership  has acquired  nonoperating
interests in producing  oil and gas  properties  which are  generally  described
below.

Principal Oil and Gas Producing Properties

         The most  valuable  fields  in the  Partnership,  based  upon  year-end
engineering  estimates of discounted  future net revenues using constant pricing
and costs, are described below.

         1. The  Eakly-Weatherford  Field is in Custer  County,  Oklahoma in the
Anadarko  Basin  (Amoco  acquisition).   The  Eakly-Weatherford  Field  produces
primarily natural gas and condensate and accounts for 69% of the value.

         2.  Approximately  22% of total  value is from  the  Giddings  Field in
Fayette and Lee Counties, Texas (Bill Fenn acquisition).  The wells produce from
the Austin Chalk and Edwards horizons.

         The remaining  value in the  Partnership  is  attributable  to numerous
properties  none of which equals or exceeds 15 percent of the total  Partnership
value.

Title to Properties

         Title to substantially  all significant  producing  properties in which
the Partnership owns  nonoperating  interests has been examined.  In addition to
the nonoperating interests owned by the Partnership,  the properties are subject
to royalty,  overriding  royalty and other interests  customary in the industry.
The Managing  General  Partner does not believe any of these burdens  materially
detract from the value of the  properties  or will  materially  detract from the
value of the properties or materially  interfere with their use in the operation
of the business of the Partnership.

Production and Sales Price

         The following table  summarizes the sales volumes of the  Partnership's
net oil and gas production  expressed in MCFs.  Equivalent  MCFs are obtained by
converting oil to gas on the basis of their relative energy content;  one barrel
equals  6,000 cubic feet of gas.  Average Net  Nonoperating  Interest  Price per
Equivalent  MCF is  determined  by dividing the related oil and gas revenue from
nonoperating interests by the equivalent MCF's produced.
<TABLE>
<CAPTION>
                                                Net Production
                                     -----------------------------------
                                              For the Years Ended
                                                 December 31,
                                     -----------------------------------
                                       1999           1998         1997
                                     -------        -------      -------
<S>                                  <C>            <C>          <C>
Net Volumes (Equivalent MCFs)        113,509        156,761      213,254

Average Net Nonoperating
   Interest Price per
   Equivalent MCF                      $1.46          $1.34        $1.93
</TABLE>


                                      I-5


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


Net Proved Oil and Gas Reserves

         Presented below are the estimates of the Partnership's  proved reserves
as of December 31, 1999,  1998 and 1997. The  Partnership  does not itself own a
direct  interest in proved  reserves.  The proved reserve  estimates shown below
represent an estimate of the proved reserves owned by the Operating  Partnership
equal to the percentage net profits interest  conveyed to the Partnership by the
Operating Partnership. All of the Partnership's nonoperating interests in proved
reserves are located in the United States.
<TABLE>
<CAPTION>
                                                                      December 31,
                                      -----------------------------------------------------------------------------
                                             1999                          1998                        1997
                                      ---------------------       ---------------------       ---------------------
                                                    Natural                     Natural                     Natural
                                        Oil           Gas           Oil           Gas           Oil           Gas
                                      --------     --------       --------     --------       --------     --------
                                       (BBLS)       (MMCF)        (BBLS)        (MMCF)         (BBLS)       (MMCF)
<S>                                   <C>          <C>            <C>          <C>            <C>          <C>
Proved developed
   reserves at end of year               7,852          648         10,159          704         18,113          999
                                      ========     ========       ========     ========       ========     ========
Proved reserves
   Balance at beginning
     of year                            11,483          833         21,082        1,226         23,510        1,202

   Extensions, discoveries
     and other additions                    --           --             24            3             --           --

   Revisions of previous
     estimates                            (476)          50         (6,277)         (91)         2,350          262

   Sales of minerals in
     place                                  (2)          --           (878)        (163)        (1,303)         (46)

   Production                           (1,862)        (102)        (2,468)        (142)        (3,475)        (192)
                                      --------      --------      --------     --------       --------     --------

   Balance at end of year                9,143          781         11,483          833         21,082        1,226
                                      ========     ========       ========     ========       ========     ========
</TABLE>


         Revisions  of  previous  quantity  estimates  are  related to upward or
downward  variations  based on current  engineering  information  for production
rates,  volumetrics and reservoir  pressure.  Additionally,  changes in quantity
estimates  are the result of the  increase  or decrease in crude oil and natural
gas prices at each year end which have the effect of adding or  reducing  proved
reserves on marginal properties due to economic limitations.


                                      I-6


<PAGE>
          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


         The following table summarizes by acquisition the  Registrant's  proved
reserves equal to the percentage net profits interests conveyed by the Operating
Partnership  and its  nonoperating  interests in gross and net producing oil and
gas wells as of December 31, 1999:
<TABLE>
<CAPTION>
                                            Reserves
                                        December 31, 1999
                                      ---------------------
                                              Natural          Wells
                                   Oil         Gas       -------------------
Acquisition          State(s)     (BBLS)      (MMCF)     Gross         Net
----------           ---------    ------      -------    -----       -------
<S>                  <C>          <C>         <C>        <C>         <C>
Amoco                OK            5,584          649      108         1.196
Bill Fenn, et al     TX            3,065           93       32         2.750
Mission III          TX              494           39        6         0.080
                                  ------      -------    -----       -------
                                   9,143          781      146         4.026
                                  ======      =======    =====       =======
</TABLE>


         There are numerous  uncertainties  inherent in estimating quantities of
proved  reserves and in projecting  the future rates of  production,  timing and
plan of  development.  Oil and gas reserve  engineering  must be recognized as a
subjective process of estimating  underground  accumulations of oil and gas that
cannot be measured  in an exact way,  and  estimates  of other  engineers  might
differ  from  those  above,  audited  by H. J.  Gruy and  Associates,  Inc.,  an
independent petroleum consulting firm. The accuracy of any reserve estimate is a
function of the quality of  available  data and of  engineering  and  geological
interpretation  and  judgment.  Results  of  drilling,  testing  and  production
subsequent  to the date of the estimate may justify  revision of such  estimate,
and, as a general rule,  reserve  estimates based upon  volumetric  analysis are
inherently  less  reliable  than  those  based on  lengthy  production  history.
Accordingly,  reserve  estimates are often  different from the quantities of oil
and gas that are ultimately recovered.

         In estimating  the oil and natural gas  reserves,  the  Registrant,  in
accordance with criteria  prescribed by the Securities and Exchange  Commission,
has used prices received as of December 31, 1999 without  escalation,  except in
those instances where fixed and determinable  gas price  escalations are covered
by  contracts,  limited  to the  price the  Partnership  reasonably  expects  to
receive.  The  Registrant  does not believe that any  favorable or adverse event
causing a significant  change in the estimated  quantity of proved  reserves has
occurred between December 31, 1999 and the date of this report.

         Future prices received for the sale of the  Partnership's  products may
be higher or lower than the prices used in the evaluation  described  above; the
operating  costs relating to such  production may also increase or decrease from
existing  levels.  The estimates  presented  above are in accordance  with rules
adopted by the Securities and Exchange Commission.

Item 3. Legal Proceedings

         The Partnership is not aware of any material pending legal  proceedings
to which it is a party or of which any of its property is the subject.

Item 4. Submission of Matters to a Vote of Security Holders

         No matters  were  submitted  to a vote of limited  partners  during the
fourth quarter of the fiscal year covered by this report.

                                      I-7


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


                                     PART II

Item 5. Market Price of and Distributions on the Registrant's Units and
           Related Limited Partner Matters

Market Information

         Units in the  Partnership  were  initially  sold at a price of $100 per
Unit.  Units are not traded on any exchange and there is no  established  public
trading  market for the Units.  Swift is aware of negotiated  transfers of Units
between  unrelated  parties;  however,  these  transfers  have been  limited and
sporadic.  Due to the  nature of these  transactions,  Swift  has no  verifiable
information regarding prices at which Units have been transferred.

Holders

         As of December 31, 1999,  there were 317 Limited Partners holding Units
in the Partnership.

Distributions

         The Partnership  generally makes distributions to Limited Partners on a
quarterly  basis,   subject  to  the  restrictions  set  forth  in  the  Limited
Partnership Agreement. In the fiscal years ended December 31, 1998 and 1999, the
Partnership distributed a total of $252,600 and $144,200,  respectively,  to the
holders of its Units.  Cash  distributions  constitute net proceeds from sale of
oil and gas  production  after  payment of lease  operating  expenses  and other
partnership expenses.  Some or all of such amounts or any proceeds from the sale
of partnership  properties  could be deemed to constitute a return of investors'
capital.

         Oil and gas  investments  involve a high risk of loss, and no assurance
can be given that any particular  level of distributions to holders of Units can
be  achieved  or  maintained.   Although  it  is   anticipated   that  quarterly
distributions  will continue to be made through 2000, the Partnership's  ability
to make distributions  could be diminished by any event adversely  affecting the
oil and gas properties in which the Partnership  owns interests or the amount of
revenues received by the Partnership therefrom.

         The  Partnership's   Limited  Partnership  Agreement  contains  various
provisions  which might serve to delay,  defer or prevent a change in control of
the Partnership,  such as the requirement of a vote of Limited Partners in order
to  sell  all  or  substantially  all  of the  Partnership's  properties  or the
requirement of consent by the Managing  General  Partner to transfers of limited
partnership  interests  and  provisions  prohibiting  the  transfer  of  Limited
Partnership  Units  in any  fiscal  year in  excess  of a limit  which  has been
established in order to comply with certain federal income tax regulations.

                                      II-1


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.



Item 6. Selected Financial Data

         The following  selected  financial  data,  prepared in accordance  with
generally  accepted  accounting  principles as of December 31, 1999, 1998, 1997,
1996 and  1995,  should be read in  conjunction  with the  financial  statements
included in Item 8.
<TABLE>
<CAPTION>
                              1999            1998            1997            1996            1995
                           ----------      ----------      -----------     -----------     -----------
<S>                        <C>             <C>             <C>             <C>             <C>
Revenues                   $  191,107      $  225,829      $   440,973     $   512,385     $   354,131
Income (Loss)              $   48,169      $   70,119      $   220,955     $   230,634     $  (212,692)
Total Assets               $  727,930      $  833,379      $ 1,042,830     $ 1,116,599     $ 1,359,294
Cash Distributions         $  155,572      $  281,260      $   295,671     $   130,477     $   218,762
Long Term Obligations      $       --      $       --      $        --     $        --     $        --
Limited Partners' Net
  Income (Loss) Per Unit   $     1.54      $     2.18      $      6.12     $      6.37     $     (5.59)
Limited Partners' Cash
  Distributions Per Unit   $     4.43      $     7.75      $      7.75     $      2.92     $      5.85
</TABLE>


Item 7. Management's Discussion and Analysis of Financial Condition
           and Results of Operations

Liquidation

      During the first  quarter of 2000,  the Managing  General  Partner  mailed
proxy material to the limited partners  proposing to sell all the  Partnership's
nonoperating  interests in oil and gas properties and dissolve and liquidate the
Partnership.   If  this  proposal  is  approved,  it  is  anticipated  that  the
liquidation of the Partnership will be  substantially  completed within the next
two years.

Liquidity and Capital Resources

      Oil and gas reserves are depleting  assets and therefore often  experience
significant  production  declines each year from the date of acquisition through
the end of the life of the  property.  The primary  source of  liquidity  to the
Partnership comes almost entirely from the income generated from the sale of oil
and gas produced from ownership interests in oil and gas properties. This source
of  liquidity  and  the  related  results  of  operations,   and  in  turn  cash
distributions,  will decline in future  periods as the oil and gas produced from
these properties also declines while  production and general and  administrative
costs remain relatively stable making it unlikely that the Partnership will hold
the properties  until they are fully depleted,  but will likely liquidate when a
substantial  majority of the reserves have been produced.  Cash distributions to
partners are determined  quarterly,  based upon the net profits interest payment
received   from  the   companion   operating   partnership,   less  general  and
administrative  expenses.  The net profits  interest payment is determined based
upon net proceeds  from sale of oil and gas  production  after  payment of lease
operating expense, taxes and development costs. In addition,  future partnership
cash requirements are taken into account to determine necessary cash reserves.

      Net cash provided by operating  activities  totaled $88,507,  $246,426 and
$384,115 in 1999, 1998 and 1997, respectively.  The decrease in cash provided by
operating activities in 1999 is related to an increase in nonoperating interests
income receivable and a decrease in the Partnership's production.  Cash provided
by proceeds  from the sales of  nonoperating  interests  in  properties  totaled
$121,887 and $74,023 in 1998 and 1997,  respectively.  Capital  expenditures  in
1999 and 1998 totaled $5,976 and $22,377,  respectively.  Cash  distributions to
partners  totaled  $155,572,  $281,260  and  $295,671  in 1999,  1998 and  1997,
respectively.  In 1999, cash distributions were effected by production  declines
from the Partnership's  depleting  property interests and low oil and gas prices
received during the first part of this year.

                                      II-2


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


      The  Partnership  has  expended  all  of  the  partners'  net  commitments
available for property  acquisitions and development by acquiring  producing oil
and gas  properties.  The  partnership  invests  primarily  in proved  producing
properties  with nominal  levels of future costs of  development  for proven but
undeveloped reserves.  Significant purchases of additional reserves or extensive
drilling activity are not anticipated.  As of December 31, 1999, the Partnership
anticipates  that its net profits  interest  will be burdened  with  $24,978 and
$18,682 over the next two years, respectively, to develop and enhance the proved
oil and gas reserves related to its nonoperating  property interests.  Under the
NP/OR Agreement,  the Managing General Partner acquires interests in oil and gas
properties  from  outside  parties and sells these  interests  to an  affiliated
operating  partnership,  who in  turn  creates  and  sells  to  the  Partnership
nonoperating  interests  in these  same  oil and gas  properties.  The  Managing
General  Partner  expects  funds  available  from net  profits  interests  to be
distributed to the partners.

Results of Operations

         Income from  nonoperating  interests  decreased 15 percent in 1999 over
1998.  Oil and gas  sales  declined  $41,305  or 13  percent  in 1999 vs.  1998,
primarily due to decreased oil and gas production.  In 1999,  production volumes
decreased  28  percent as oil and gas  production  declined  25  percent  and 28
percent,  respectively,  when compared to 1998. Production declines were related
to normal depletion and the  Partnership's  property sales. Oil prices increased
55 percent or $6.42/BBL to an average of $18.14/BBL and gas prices  increased 11
percent or $0.22/MCF to an average of $2.27/MCF for 1999.  Increased oil and gas
prices helped offset the effect of decreased production.

         Corresponding  production costs per equivalent MCF increased 26 percent
in 1999  compared to 1998,  and total  production  costs  decreased 9 percent in
1999, due to production declines.

         Associated amortization expense decreased 24 percent or $23,436 in 1999
compared to 1998, related to the decline in production volumes.

         Income from  nonoperating  interests  decreased 51 percent in 1998 over
1997. Oil and gas sales  decreased 46 percent in 1998 vs. 1997. 1998 gas and oil
prices   decreased  22  percent  or  $.57/MCF  and  35  percent  or   $6.33/BBL,
respectively.  These price  declines  had a  significant  impact on  partnership
performance.  Also,  production volumes decreased 26 percent due to a 26 percent
gas  production  decrease  and  a  29  percent  oil  production   decline.   The
partnership's sale in late 1997 of properties in Oklahoma and Texas,  related to
the Sugarland acquisiton, further contributed to the decreased volumes for 1998.

         Two  components,  the  normal  provision,  calculated  on the  units of
production  method,  and  the  additional  provision,  relating  to the  ceiling
limitation,  make up total  amortization  expense.  Total  amortization  expense
decreased 39 percent or $61,831 in 1998 when compared to 1997,  primarily due to
the  26  percent  production  volume  decrease.   No  additional  provision  for
amortization was recorded in 1998 or 1997.

         During 2000,  Partnership revenues and costs will be shared between the
limited partners and general partners in an 90:10 ratio, based on the annualized
rate of cash  distributions by the Partnership  during a certain period prior to
December 31, 1999.  Based on current oil and gas prices,  current  levels of oil
and gas  production  and expected cash  distributions  during 2000, the Managing
General Partner  anticipates that Partnership  payout will occur in 2000 and the
sharing ratio will change to 85:15.

Year 2000

         The Year 2000  issue  resulted  from  computer  programs  and  embedded
computer  chips with date fields which could not  distinguish  between the years
1900 and 2000. The Managing General Partner  implemented steps necessary to make
its  operations  and  the  related  operations  of the  Partnership  capable  of
addressing the Year 2000. These steps included upgrading, testing and certifying
its  computer  systems and field  operation  services  and  obtaining  Year 2000
compliance  certification  from all important business  suppliers.  The Managing
General  Partner  formed a task force during 1998 to address the Year 2000 issue
and prepare its business systems for the Year 2000. The Managing General Partner
either replaced or updated mission critical systems and completed testing before
2000 began.

                                      II-3

<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


         The Managing  General  Partner's  business  systems are almost entirely
comprised of off-the-shelf  software.  Most of the necessary changes in computer
instructional  code were made by  upgrading  this  software.  In  addition,  the
Managing General Partner received  certification as to Year 2000 compliance from
vendors or third party consultants.

         The costs  incurred to address the Year 2000 issue with  respect to the
Managing  General  Partners'  business systems did not have a material effect on
the  Partnership's  results  of  operations,  or  its  liquidity  and  financial
condition.  The estimated total cost to the Managing  General Partner to address
Year 2000  issues  was less than  $150,000,  most of which was spent  during the
testing phase. The Partnership's share of this cost was insignificant.

         The most  reasonably  likely  worst  case  scenario  would  have been a
prolonged disruption of external power sources upon which core equipment relies,
resulting in a substantial  decrease in the Partnership's oil and gas production
activities.  In addition,  the pipeline  operators to whom the Managing  General
Partner  sells the  Partnership's  natural gas, as well as other  customers  and
suppliers,  could  have  been  prone to Year  2000  problems  that  could not be
assessed or detected by the Managing General Partner.

         As of the filing of this report,  the Managing  General  Partner is not
aware of any Year 2000 problems either  experienced by it or by parties which it
does business, and does not expect to experience such problems in the future.


Item 8. Financial Statements and Supplementary Data

         See Part IV, Item 14(a) for index to financial statements.


Item 9. Disagreements on Accounting and Financial Disclosure

         None.

                                      II-4

<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.

                                    PART III

Item 10.  Directors and Executive Officers of the Registrant

         As a limited partnership,  the Registrant has no directors or executive
officers.  The  business and affairs of the  Registrant  are managed by Swift as
Managing General Partner. Set forth below is certain information as of March 10,
2000 regarding the directors and executive officers of Swift.
<TABLE>
<CAPTION>
                                                      Position(s) with
         Name                   Age              Swift and Other Companies
         ----                   ---              -------------------------
                                         DIRECTORS
                                         ---------
<S>                             <C>           <C>
A. Earl Swift                   66            Chief Executive Officer and
                                              Chairman of the Board

Virgil N. Swift                 71            Executive Vice President - Business
                                              Development, Vice Chairman of the Board

G. Robert Evans                 68            Director of Swift; Chairman of the Board,
                                              Material Sciences Corporation;
                                              Director, Consolidated Freightways, Inc.,
                                              Fibreboard  Corporation, Elco Industries,and
                                              Old Second Bancorp

Raymond O. Loen                 75            Director of Swift; President, R. O. Loen
                                              Company

Henry C. Montgomery             64            Director of Swift; Chairman of the Board,
                                              Montgomery Financial Services Corporation;
                                              Director, Southwall Technology Corporation

Clyde W. Smith, Jr.             51            Director of Swift; President, Somerset
                                              Properties, Inc.

Harold J. Withrow               72            Director of Swift

                                         EXECUTIVE OFFICERS
                                         ------------------
Terry E. Swift                  44            President

Joe A. D'Amico                  51            Chief Operating Officer

John R. Alden                   54            Senior Vice President - Finance,
                                              Chief Financial Officer and Secretary

Bruce H. Vincent                52            Senior Vice President - Funds Management

James M. Kitterman              55            Senior Vice President - Operations

Alton D. Heckaman, Jr.          42            Vice President - Finance and Controller
</TABLE>



                                     III-1

<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.


         From time to time, Swift as Managing General Partner of the Partnership
purchases Units in the  Partnership  from investors who offer the Units pursuant
to their right of  presentment,  which  purchases are made pursuant to terms set
out in the  Partnership's  original Limited  Partnership  Agreement.  Due to the
frequency  and  large  number  of  these   transactions,   Swift  reports  these
transactions  under  Section  16 of the  Securities  Exchange  Act of 1934 on an
annual  rather than a monthly  basis.  In some cases such annual  reporting  may
constitute a late filing of the required Section 16 reports under the applicable
Section 16 rules.

Item 11.  Executive Compensation

         As  noted  in  Item  10,  "Directors  and  Executive  Officers  of  the
Registrant,"  above,  the Partnership has no executive  officers.  The executive
officers of Swift and VJM are not compensated by the Partnership.

         Certain fees and  allowances  contemplated  by the Limited  Partnership
Agreement  have been paid by the  Partnership  to Swift and VJM. See Note (4) in
Notes  To  Financial   Statements   (Related-Party   Transactions)  for  further
discussion.

Item 12.  Security Ownership of Certain Beneficial Owners and Management

         No  single  limited  partner  is  known  to the  Partnership  to be the
beneficial owner of more than five percent of the Partnership's Units.

         Swift and VJM are not aware of any arrangement,  the operation of which
may at a subsequent date result in a change in control of the Partnership.

Item 13.  Certain Relationships and Related Transactions

         As  noted  in  Item  10,  "Directors  and  Executive  Officers  of  the
Registrant," above, the Partnership has no executive officers or directors,  and
thus has not  engaged  in any  transactions  in which  any  such  person  had an
interest.  The Partnership is permitted to engage in certain  transactions  with
Swift as Managing General Partner and VJM as Special General Partner, subject to
extensive  guidelines  and  restrictions  as  described  in  the  "Conflicts  of
Interest"  section  of the  Amended  Prospectus  contained  in the  Registration
Statement, which is incorporated herein by reference.

         Summarized  below are the  principal  transactions  that have  occurred
between the Partnership,  on one hand, and Swift, VJM and their  affiliates,  on
the other.

Certain Transactions with General Partners

         1.  As  described  in  Item  1,  "Business,"  above,  during  1990  the
Partnership  entered into an NP/OR  Agreement  with the  Operating  Partnership,
which is also managed by Swift and VJM.  Pursuant to such NP/OR  Agreement,  the
Operating Partnership acquired the oil and gas properties described under Item 2
above and conveyed nonoperating interests therein to the Partnership.

         2.  Swift  acts  as  operator  for  many  of the  wells  in  which  the
Partnership has  nonoperating  interests and has received  compensation for such
activities in accordance with standard industry operating agreements.

         3. The  Partnership  paid to Swift and VJM certain fees as contemplated
by the  Limited  Partnership  Agreement.  See Note  (4) in  Notes  To  Financial
Statements (Related-Party Transactions) for further discussion.


                                     III-2

<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.

                                     PART IV


Item 14. Exhibits, Financial Statement Schedules and Reports on Form 8-K
<TABLE>
<CAPTION>
      a(1)     FINANCIAL STATEMENTS                                             PAGE NO.
               --------------------                                             --------
               <S>                                                              <C>

               Report of Independent Public Accountants                          IV-2

               Balance Sheets as of December 31, 1999 and 1998                   IV-3

               Statements of Operations for the years ended
                  December 31, 1999, 1998 and 1997                               IV-4

               Statements of Partners' Capital for the years ended
                  December 31, 1999, 1998 and 1997                               IV-5

               Statements of Cash Flows for the years ended
                  December 31, 1999, 1998 and 1997                               IV-6

               Notes to Financial Statements                                     IV-7
</TABLE>

       a(2)    FINANCIAL STATEMENT SCHEDULES

               All schedules required by the SEC are either  inapplicable or the
               required information is included in the Financial Statements, the
               Notes thereto, or in other information included elsewhere in this
               report.

       a(3)    EXHIBITS

                3.1   Limited  Partnership  Agreement  of Swift  Energy  Managed
                      Pension Assets  Partnership  1990-B,  Ltd., dated June 30,
                      1990. (Form 10-K for year ended December 31, 1990, Exhibit
                      3.1).

                3.2   Certificate of Limited Partnership of Swift Energy Managed
                      Pension Assets Partnership 1990-B, Ltd., as filed June 29,
                      1990,  with the Texas  Secretary of State.  (Form 10-K for
                      year ended December 31, 1990, Exhibit 3.2).

                10.1  Net  Profits and  Overriding  Royalty  Interest  Agreement
                      between Swift Energy Managed  Pension  Assets  Partnership
                      1990-B, Ltd. and Swift Energy Income Partners 1990-B, Ltd.
                      dated June 30,  1990.  (Form 10-K for year ended  December
                      31, 1990, Exhibit 10.1).

                99.1  A copy of the following section of the Amended  Prospectus
                      dated  November  13,  1987,  contained  in  Post-Effective
                      Amendment No. 1 to Registration  Statement No. 33-15998 on
                      Form S-1 for Swift Energy  Managed  Pension Assets Fund I,
                      as filed on November 3, 1988, which have been incorporated
                      herein by reference:  "Proposed  Activities"  (pp 38 - 48)
                      and  "Conflicts of Interest" (pp. 70 - 79). (Form 10-K for
                      year ended December 31, 1990, Exhibit 28.1).

  b(1) REPORTS ON FORM 8-K

          No  reports  on Form 8-K have been  filed  during  the  quarter  ended
December 31, 1999.

Supplemental  Information to be Furnished with Reports Filed Pursuant to Section
15(d) of the Act by Registrants Which Have Not Registered Securities Pursuant to
Section 12 of the Act.

         No annual report to security  holders covering the  Partnership's  1999
fiscal year has been sent to Limited Partners of the Partnership.


                                      IV-1

<PAGE>

                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


To Swift Energy Managed Pension Assets Partnership 1990-B, Ltd.:

         We have audited the accompanying balance sheets of Swift Energy Managed
Pension Assets  Partnership  1990-B,  Ltd., (a Texas limited  partnership) as of
December 31, 1999 and 1998, and the related statements of operations,  partners'
capital and cash flows for the years ended  December  31,  1999,  1998 and 1997.
These  financial  statements  are the  responsibility  of the  Managing  General
Partner's  management.  Our  responsibility  is to  express  an opinion on these
financial statements based on our audits.

         We conducted our audits in accordance with auditing standards generally
accepted in the United States.  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  financial  statements  referred to above  present
fairly, in all material respects, the financial position of Swift Energy Managed
Pension Assets Partnership  1990-B,  Ltd., as of December 31, 1999 and 1998, and
the results of its  operations  and its cash flows for the years ended  December
31, 1999,  1998 and 1997 in  conformity  with  accounting  principles  generally
accepted in the United States.

                                               ARTHUR ANDERSEN LLP




Houston, Texas
February 9, 2000


                                      IV-2

<PAGE>


                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1990-B, LTD.

                                 BALANCE SHEETS
                           DECEMBER 31, 1999 AND 1998


<TABLE>
<CAPTION>
                                                                       1999                 1998
                                                                   -----------         ------------
        ASSETS:
        <S>                                                        <C>                  <C>
        Current Assets:
             Cash and cash equivalents                             $   185,528         $    258,558
             Nonoperating interests income receivable                   70,532               36,613
             Other                                                       6,892                6,282
                                                                   -----------         ------------
                  Total Current Assets                                 262,952              301,453
                                                                   -----------         ------------

        Nonoperating interests in oil and gas
             properties, using full cost accounting                  3,967,058            3,961,093
        Less-Accumulated amortization                               (3,502,080)          (3,429,167)
                                                                   -----------         ------------
                                                                       464,978              531,926
                                                                   -----------         ------------
                                                                   $   727,930         $    833,379
                                                                   ===========         ============


        LIABILITIES AND PARTNERS' CAPITAL:

        Current Liabilities:
             Accounts Payable                                      $     8,574         $      6,620
                                                                   -----------         ------------


        Limited Partners' Capital (32,590 Limited Partnership
                                    Units; $100 per unit)              711,385              810,945
        General Partners' Capital                                        7,971               15,814
                                                                   -----------         ------------
                  Total Partners' Capital                              719,356              826,759
                                                                   -----------         ------------
                                                                   $   727,930         $    833,379
                                                                   ===========         ============
</TABLE>



                 See accompanying notes to financial statements.


                                      IV-3

<PAGE>

                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1990-B, LTD.

                            STATEMENTS OF OPERATIONS
              FOR THE YEARS ENDED DECEMBER 31, 1999, 1998 AND 1997



<TABLE>
<CAPTION>
                                                        1999           1998           1997
                                                     ----------    -----------    -----------
       <S>                                           <C>           <C>            <C>
       REVENUES:
            Income from nonoperating interests       $  179,994    $   212,187    $    36,637
            Interest income                              11,113         13,642          4,336
                                                     ----------    -----------    -----------
                                                        191,107        225,829        440,973
                                                     ----------    -----------    -----------


       COSTS AND EXPENSES:
            Amortization                                 72,913         96,349        158,180
            General and administrative                   70,025         59,361         61,838
                                                     ----------    -----------    -----------
                                                        142,938        155,710        220,018
                                                     ----------    -----------    -----------
       NET INCOME (LOSS)                             $   48,169    $    70,119    $   220,955
                                                     ==========    ===========    ===========
</TABLE>




                 See accompanying notes to financial statements.


                                      IV-4

<PAGE>

                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1990-B, LTD.

                         STATEMENTS OF PARTNERS' CAPITAL
              FOR THE YEARS ENDED DECEMBER 31, 1999, 1998 AND 1997

<TABLE>
<CAPTION>
                                                   Limited           General         Combining
                                                   Partners         Partners         Adjustment           Total
                                                 ------------    --------------    --------------     --------------
       <S>                                       <C>             <C>               <C>                <C>
       Balance,
            December 31, 1996                    $  1,034,087    $       55,850    $       22,679     $    1,112,616

       Income (Loss)                                  199,478            25,345            (3,868)           220,955

       Cash Distributions                            (252,600)          (43,071)               --           (295,671)
                                                 ------------    --------------    --------------     --------------

       Balance,
            December 31, 1997                         980,965            38,124            18,811          1,037,900
                                                 ------------    --------------    --------------     --------------

       Income (Loss)                                   71,132             6,350            (7,363)            70,119

       Cash Distributions                            (252,600)          (28,660)               --           (281,260)
                                                 ------------    --------------    --------------     --------------

       Balance,
            December 31, 1998                         799,497            15,814            11,448            826,759
                                                 ------------    --------------    --------------     --------------

       Income (Loss)                                   50,037             3,529            (5,397)            48,169

       Cash Distributions                            (144,200)          (11,372)               --           (155,572)
                                                 ------------    --------------    --------------     --------------

       Balance,
            December 31, 1999                    $    705,334    $        7,971     $       6,051     $     719,356
                                                 ============    ==============    ==============     ==============


       Limited Partners' net income (loss)
            per unit

            1997                                 $       6.12
                                                 ============

            1998                                 $       2.18
                                                 ============

            1999                                 $       1.54
                                                 ============
</TABLE>

                 See accompanying notes to financial statements.

                                      IV-5

<PAGE>


                          SWIFT ENERGY MANAGED PENSION
                         ASSETS PARTNERSHIP 1990-B, LTD.

                            STATEMENTS OF CASH FLOWS
              FOR THE YEARS ENDED DECEMBER 31, 1999, 1998 AND 1997


<TABLE>
<CAPTION>

                                                                                   1999             1998             1997
                                                                                ----------     ------------     ------------
<S>                                                                             <C>            <C>              <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
     Income (loss)                                                              $   48,169     $     70,119     $    220,955
     Adjustments to reconcile income (loss) to
          net cash provided by operations:
          Amortization                                                              72,913           96,349          158,180
          Change in assets and liabilities:
               (Increase) decrease in nonoperating interests income receivable     (33,919)          84,550            4,033
               (Increase) decrease in other current assets                            (610)          (6,282)              --
               Increase (decrease) in accounts payable                               1,954            1,690              947
                                                                                ----------     ------------     ------------
           Net cash provided by (used in) operating activities                      88,507          246,426          384,115
                                                                                ----------     ------------     ------------

CASH FLOWS FROM INVESTING ACTIVITIES:
     Additions to nonoperating interests in oil and gas properties                  (5,976)         (22,377)              --
     Proceeds from sales of nonoperating interests in oil and gas properties            11          121,887           74,023
                                                                                ----------     ------------     ------------
          Net cash provided by (used in) investing activities                       (5,965)          99,510           74,023
                                                                                ----------     ------------     ------------

CASH FLOWS FROM FINANCING ACTIVITIES:
     Cash distributions to partners                                               (155,572)        (281,260)        (295,671)
                                                                                ----------     ------------     ------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                               (73,030)          64,676          162,467
                                                                                ----------     ------------     ------------
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                                     258,558          193,882           31,415
                                                                                ----------     ------------     ------------
CASH AND CASH EQUIVALENTS AT END OF YEAR                                        $  185,528     $    258,558     $    193,882
                                                                                ==========     ============     ============
</TABLE>




                 See accompanying notes to financial statements.

                                      IV-6

<PAGE>


          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.
                          NOTES TO FINANCIAL STATEMENTS

(1) Organization and Terms of Partnership Agreement -

         Swift Energy Managed Pension Assets Partnership  1990-B,  Ltd., a Texas
limited  partnership ("the  Partnership"),  was formed on June 30, 1990, for the
purpose of purchasing net profits  interests,  overriding  royalty interests and
royalty interests (collectively,  "nonoperating interests") in producing oil and
gas  properties  within the  continental  United  States.  Swift Energy  Company
("Swift"),  a Texas  corporation,  and VJM  Corporation  ("VJM"),  a  California
corporation,  serve as Managing  General  Partner and Special General Partner of
the Partnership,  respectively.  The general partners are required to contribute
up to 1/99th of limited partner net contributions. The 345 limited partners made
total capital contributions of $3,259,002.

         Nonoperating  interests  acquisition  costs and the  management fee are
borne  99  percent  by the  limited  partners  and one  percent  by the  general
partners.  Organization  and syndication  costs were borne solely by the limited
partners.

         Initially,  all continuing costs (including  general and administrative
reimbursements and direct expenses) and revenues are allocated 90 percent to the
limited  partners  and  ten  percent  to  the  general  partners.  If  prior  to
partnership payout, as defined,  however, the cash distribution rate (as defined
in the  Partnership  Agreement)  for a certain  period  equals or  exceeds  17.5
percent,  then for the  following  calendar  year,  these  continuing  costs and
revenues will be allocated 85 percent to the limited  partners and 15 percent to
the general partners.  After partnership  payout,  continuing costs and revenues
will be shared 85 percent by the limited partners, and 15 percent by the general
partners,  even if the cash distribution rate is less than 17.5 percent.  During
1993, 1992 and 1991, the cash  distribution rate exceeded 17.5 percent and thus,
in 1994, 1993 and 1992, the continuing costs and revenues were shared 85 percent
by the limited  partners  and 15 percent by the general  partners.  During 1999,
1998,  1997,  1996,  1995 and 1994, the cash  distribution  rate fell below 17.5
percent and thus, in 2000, 1999, 1998, 1997, 1996 and 1995, the continuing costs
and  revenues  will be (were)  shared 90 percent by the limited  partners and 10
percent by the general  partners.  Payout had not  occurred  as of December  31,
1999.

         During the first quarter of 2000, the Managing  General  Partner mailed
proxy material to the limited partners  proposing to sell all the  Partnership's
nonoperating  interests in oil and gas properties and dissolve and liquidate the
Partnership.   If  this  proposal  is  approved,  it  is  anticipated  that  the
liquidation of the Partnership will be  substantially  completed within the next
two years.

(2) Significant Accounting Policies -

Use of Estimates --

         The  preparation of financial  statements in conformity  with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that affect the reported  amounts of assets and  liabilities at the
date of the  financial  statements  and the  reported  amounts of  revenues  and
expenses  during  the  reporting  period.   Actual  results  could  differ  from
estimates.

Oil and Gas Revenues --

         Oil and gas revenues are reported using the entitlement method in which
the  Partnership  recognizes  its interest in oil and natural gas  production as
revenue.

Nonoperating Interests in Oil and Gas Properties --

         The  Partnership  accounts  for its  ownership  interest in oil and gas
properties   using  the   proportionate   consolidation   method,   whereby  the
Partnership's share of assets, liabilities, revenues and expenses is included in
the appropriate classification in the financial statements.

                                      IV-7


<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


         For  financial   reporting   purposes,   the  Partnership  follows  the
"full-cost"  method of  accounting  for  nonoperating  interests  in oil and gas
properties.  Under  this  method  of  accounting,  all  costs  incurred  in  the
acquisition of nonoperating interests in oil and gas properties are capitalized.
The  unamortized  cost of  nonoperating  interests in oil and gas  properties is
limited to the "ceiling limitation", (calculated separately for the Partnership,
limited partners, and general partners).  The "ceiling limitation" is calculated
on a quarterly  basis and  represents  the  estimated  future net revenues  from
nonoperating interests in proved properties using current prices,  discounted at
ten percent.  Proceeds from the sale or disposition of nonoperating interests in
oil  and  gas  properties  are  treated  as a  reduction  of  the  cost  of  the
nonoperating  interests with no gains or losses recognized except in significant
transactions.

         The Partnership computes the provision for amortization of nonoperating
interests in oil and gas  properties on the  units-of-production  method.  Under
this method,  the provision is calculated by multiplying  the total  unamortized
cost of  nonoperating  interests  in oil and gas  properties  by an overall rate
determined  by dividing  the physical  units of oil and gas produced  during the
period by the total estimated units of proved oil and gas reserves  attributable
to the Partnership's nonoperating interests at the beginning of the period.

         The  calculation  of the "ceiling  limitation"  and the  provision  for
amortization  is based on  estimates  of proved  reserves.  There  are  numerous
uncertainties  inherent  in  estimating  quantities  of proved  reserves  and in
projecting the future rates of production,  timing and plan of development.  The
accuracy of any reserve  estimate is a function of the quality of available data
and of  engineering  and  geological  interpretation  and  judgment.  Results of
drilling,  testing and  production  subsequent  to the date of the  estimate may
justify  revision of such  estimate.  Accordingly,  reserve  estimates are often
different from the quantities of oil and gas that are ultimately recovered.

Cash and Cash Equivalents --

         Highly liquid debt instruments with an initial maturity of three months
or less are considered to be cash equivalents.

Reclassifications --

         Certain  reclassifications have been made to the prior year balances to
conform with the current year presentation.

(3) Acquisition of Nonoperating Interests in Oil and Gas Property Costs -

         Effective June 30, 1990, the Partnership entered into a Net Profits and
Overriding  Royalty Interests  Agreement  ("NP/OR  Agreement") with Swift Energy
Income Partners 1990-B, Ltd.  ("Operating  Partnership"),  managed by Swift, for
the purpose of acquiring  interests in producing oil and gas  properties.  Under
the  terms  of  the  NP/OR  Agreement,  the  Partnership  has  been  conveyed  a
nonoperating  interest in the aggregate net profits (i.e., oil and gas sales net
of  related   operating   costs)  of  the  properties   acquired  equal  to  its
proportionate  share of the property  acquisition  costs,  as defined.  Property
acquisition costs are amounts actually paid by the Operating Partnership for the
properties  plus costs  incurred by the Operating  Partnership  in acquiring the
properties  and costs  related to screening and  evaluation  of  properties  not
acquired. In 1999 and 1998, the Partnership acquired  nonoperating  interests in
producing oil and gas properties for $5,976 and $22,377, respectively.

(4) Related-Party Transactions -

         An  affiliate  of the  Special  General  Partner,  as  Dealer  Manager,
received $81,475 for managing and overseeing the offering of limited partnership
units.

         A  one-time  management  fee of  $81,475  was paid to Swift in 1990 for
services  performed  for the  Partnership.  During  1999,  1998  and  1997,  the
Partnership paid Swift $48,885 per year as a general and administrative overhead
allowance.

(5) Federal Income Taxes -

         The Partnership is not a tax-paying entity. No provision is made in the
accounts of the Partnership for federal or state income taxes,  since such taxes
are liabilities of the individual partners,  and the amounts thereof depend upon
their respective tax situations.

                                      IV-8

<PAGE>

          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.
                    NOTES TO FINANCIAL STATEMENTS (CONTINUED)


         The tax returns and the amount of distributable  Partnership income are
subject to  examination  by the federal  and state  taxing  authorities.  If the
Partnership's  royalty  income for federal  income tax  purposes  is  ultimately
changed by the taxing  authorities,  the tax  liability of the limited  partners
could be changed  accordingly.  Royalty  income  reported  on the  Partnership's
federal  return of income for the years ended  December 31, 1999,  1998 and 1997
was  $109,612,  $147,143 and  $389,590,  respectively.  The  difference  between
royalty income for federal income tax purposes  reported by the  Partnership and
income or loss from  nonoperating  interests  reported herein primarily  results
from the exclusion of  amortization  (as described  below) from ordinary  income
reported in the Partnership's federal return of income.

         For  federal  income  tax  purposes,   amortization   with  respect  to
nonoperating  interests in oil and gas properties is computed  separately by the
partners  and not by the  Partnership.  Since  the  amount  of  amortization  on
nonoperating  interests in oil and gas is not computed at the Partnership level,
amortization is not included in the Partnership's  income for federal income tax
purposes but is charged directly to the partners' capital accounts to the extent
of the cost of the nonoperating interests in oil and gas properties, and thus is
treated as a separate  item on the  partners'  Schedule  K-1.  Amortization  for
federal income tax purposes may vary from that computed for financial  reporting
purposes in cases where a ceiling adjustment is recorded,  as such amount is not
recognized for tax purposes.

(6) Vulnerability Due to Certain Concentrations -

         The Partnership's revenues are primarily the result of sales of its oil
and natural gas  production.  Market prices of oil and natural gas may fluctuate
and adversely affect operating results.

         In the normal  course of  business,  the  Partnership  extends  credit,
primarily  in the form of  monthly  oil and gas sales  receivables,  to  various
companies in the oil and gas industry which results in a concentration of credit
risk. This  concentration  of credit risk may be affected by changes in economic
or other conditions and may accordingly impact the Partnership's  overall credit
risk. However,  the Managing General Partner believes that the risk is mitigated
by the size,  reputation,  and nature of the companies to which the  Partnership
extends  credit.  In  addition,  the  Partnership  generally  does  not  require
collateral or other security to support customer receivables.

(7) Fair Value of Financial Instruments -

         The  Partnership's  financial  instruments  consist  of cash  and  cash
equivalents  and  short-term  receivables  and  payables.  The carrying  amounts
approximate  fair  value  due to the  highly  liquid  nature  of the  short-term
instruments.

                                      IV-9


<PAGE>


          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.

                                   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.

                                              SWIFT ENERGY MANANGED PENSION
                                              ASSETS PARTNERSHIP 1990-B, LTD.
                                              (Registrant)

                                     By:      SWIFT ENERGY COMPANY
                                               General Partner

Date:      March 10, 2000            By:      s/b A. Earl Swift
           --------------                     ----------------------------------
                                              A. Earl Swift
                                              Chief Executive Officer

Date:      March 10, 2000            By:      s/b John R. Alden
           --------------                     ----------------------------------
                                              John R. Alden
                                              Principal Financial Officer

Date:      March 10, 2000            By:      s/b Alton D. Heckaman, Jr.
           --------------                     ----------------------------------
                                              Alton D. Heckaman, Jr.
                                              Principal Accounting 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 and
in the capacities and on the dates indicated.

                                              SWIFT ENERGY MANAGED PENSION
                                              ASSETS PARTNERSHIP 1990-B, LTD.
                                              (Registrant)

                                     By:      SWIFT ENERGY COMPANY
                                               General Partner

Date:      March 10, 2000            By:      s/b A. Earl Swift
           --------------                     ----------------------------------
                                              A. Earl Swift
                                              Director and Principal
                                              Executive Officer

Date:      March 10, 2000            By:      s/b Virgil N. Swift
           --------------                     ----------------------------------
                                              Virgil N. Swift
                                              Director and Executive
                                              Vice President - Business
                                              Development


                                      V-1

<PAGE>
          SWIFT ENERGY MANAGED PENSION ASSETS PARTNERSHIP 1990-B, LTD.

                                   SIGNATURES


Date:      March 10, 2000            By:      s/b G. Robert Evans
           --------------                     ----------------------------------
                                              G. Robert Evans
                                              Director

Date:      March 10, 2000            By:      s/b Raymond O. Loen
           --------------                     ----------------------------------
                                              Raymond O. Loen
                                              Director

Date:      March 10, 2000            By:      s/b Henry C. Montgomery
           --------------                     ----------------------------------
                                              Henry C. Montgomery
                                              Director

Date:      March 10, 2000            By:      s/b Clyde W. Smith, Jr.
           --------------                     ----------------------------------
                                              Clyde W. Smith, Jr.
                                              Director

Date:      March 10, 2000            By:      s/b Harold J. Withrow
           --------------                     ----------------------------------
                                              Harold J. Withrow
                                              Director

                                      V-2