XOMA LTD
S-3/A, 1999-05-07
PHARMACEUTICAL PREPARATIONS
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       As filed with the Securities and Exchange Commission on May 7, 1999

                                                      Registration No. 333-74205
- --------------------------------------------------------------------------------
    
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                               ------------------

                                 AMENDMENT NO. 1
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933
                               ------------------

                                    XOMA LTD.
             (Exact name of registrant as specified in its charter)

            Bermuda                                      94-2756657
(State or other jurisdiction of                       (I.R.S. Employer
incorporation or organization)                       Identification No.)

                               2910 Seventh Street
                           Berkeley, California 94710
                                 (510) 644-1170
          (Address, including ZIP code, and telephone number, including
             area code, of registrant's principal executive offices)
                               ------------------

                          CHRISTOPHER J. MARGOLIN, ESQ.
                                    XOMA LTD.
                               2910 Seventh Street
                           Berkeley, California 94710
                                 (510) 644-1170
            (Name, address, including ZIP code, and telephone number,
                   including area code, of agent for service)
                               ------------------

                                    Copy to:
                           GEOFFREY E. LIEBMANN, ESQ.
                             CAHILL GORDON & REINDEL
                                 80 Pine Street
                            New York, New York 10005
                                 (212) 701-3000
                               ------------------
Approximate date of commencement of proposed sale to the public: From time to
time after the effective date of this Registration Statement.

If the only securities being registered on this Form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. / /

If any of the securities being registered on this Form are to be offered
on a delayed or continuous basis pursuant to Rule 415 under the Securities Act
of 1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. /X/

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the Securities Act registration statement number of the earlier effective
registration statement for the same offering.

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / /

If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. / /




<PAGE>

<TABLE>
<CAPTION>


                         CALCULATION OF REGISTRATION FEE

     Title of Each Class                                       Proposed                 Proposed
        of Securities                   Amount                  Maximum                 Maximum                Amount of
            To Be                       To Be               Offering Price             Aggregate             Registration
          Registered                  Registered              per Unit(1)          Offering Price(1)              Fee
- ---------------------------------------------------------------------------------------------------------------------------

<S>                                <C>                          <C>                  <C>                       <C>
Common Shares,
par value U.S. $.0005
per share...................       4,481,508(2)(3)              $3.0625               $13,724,619              $3,816(4)
</TABLE>


(1)  Estimated solely for purposes of computing the registration fee pursuant to
     Rule 457(c).

(2)  Includes a like number of Preference Share Purchase Rights (the "Rights").
     Since no separate consideration is paid for the Rights, the registration
     fee is included in the fee for the Common Shares.

   
(3)  Pursuant to Rule 416 under the Securities Act of 1933, any additional
     Common Shares issued as a result of stock splits, stock dividends or
     similar transactions are deemed to be registered herewith.


(4)  Previously paid.
    

The Registrant hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the Registrant shall file
a further amendment which specifically states that this Registration Statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.

- -------------------------------------------------------------------------------

                                      -2-
<PAGE>

The information contained in this prospectus is not complete and may be changed.
This prospectus is not an offer to sell these securities and it is not
soliciting an offer to buy these securities in any state where the offer or sale
is not permitted.



   
Prospectus                                               Subject to Completion,
                                                         dated  May 7, 1999
    
                                    XOMA Ltd.
                             4,481,508 Common Shares
- -------------------------------------------------------------------------------

   
o    All of the common shares offered by this    o Our common shares are listed
     prospectus are being offered by certain       on the Nasdaq National
     of our shareholders, who will receive         Market under the symbol
     all of the proceeds.                          "XOMA."  The last reported
                                                   sale price for the common
                                                   shares on May 5, 1999 was
                                                   US$3.00 per share.
    
- -------------------------------------------------------------------------------

   
     THIS INVESTMENT INVOLVES A HIGH DEGREE OF RISK. CONSIDER CAREFULLY THE RISK
FACTORS BEGINNING ON PAGE 3 OF THIS PROSPECTUS BEFORE YOU INVEST.

                              --------------------

     Neither the SEC nor any state securities commission has approved these
securities or determined that this prospectus is accurate or complete. Any
representation to the contrary is a criminal offense.
    

                              --------------------

   
                The date of this prospectus is        , 1999.
    



<PAGE>



                                TABLE OF CONTENTS




<TABLE>
<CAPTION>

   
<S>                                                    <C>
Risk Factors...............................     3       Selling Shareholders.......................    14
Incorporation of Information We File                    Description of Share Capital...............    16
  with the SEC ............................     4       Plan of Distribution.......................    21
Disclosure Regarding Forward-Looking                    Legal Opinion..............................    22
 Statements ...............................     5       Experts....................................    22
XOMA.......................................    12       Where You Can Get More Information.........    22
Price Range of Common Shares and
  Dividend Information ....................    13
    
</TABLE>
                                       2
<PAGE>



                                  RISK FACTORS

   
     You should carefully consider the following factors and other information
in this prospectus before deciding to invest in common shares.

None Of Our Products Have Received Regulatory Approval; If We Do Not
Receive Regulatory Approval, We Will Not Be Able To Manufacture
And Market Our Products

     Even our most developed product has yet to complete final clinical testing.
We will be unable to manufacture and market our products without required
regulatory approvals in the United States and other countries. The United States
government and governments of other countries extensively regulate many aspects
of our products, including:
    

     o    testing

     o    manufacturing

     o    promotion and marketing and

     o    export.

   
     In the United States, the Food and Drug Administration regulates
pharmaceutical products under the Federal Food, Drug, and Cosmetic Act and other
laws, including, in the case of biologics, the Public Health Service Act. At the
present time, we believe that our products will be regulated by the FDA as
biologics. State regulations may also affect our proposed products.

     In December 1992, we submitted an investigational new drug application to
the FDA to begin Phase I human testing of our NEUPREX(R) product, a
genetically-engineered fragment of a human protein (BPI). We are currently
conducting Phase III pivotal trials testing the NEUPREX(R) product as a
treatment in two indications:


     o    treatment of meningococcemia (a potentially deadly bacterial infection
          principally of children) and


     o    prevention of serious pulmonary complications (pneumonia and/or acute
          respiratory distress syndrome) in patients suffering from severe blood
          loss due to trauma (hemorrhagic trauma) .
    
   
We have conducted earlier stage clinical trials testing NEUPREX(R) as a
treatment in three additional indications:

     o    prevention of complications following partial hepatectomy (a type of
          major liver surgery)


     o    treatment of severe infections within the abdomen in combination with
          antibiotics and


     o    treatment of cystic fibrosis patients (whose genetic disorder
          predisposes them to recurring bacterial lung infections).

     In September 1996, XOMA and Genentech, Inc. announced that an
investigational new drug application with the FDA for clinical testing of hu1124
in patients with moderate to severe psoriasis had been filed. We completed a
Phase II study in Canada in psoriasis patients in late 1998, subsequently
received a $2 million milestone payment from Genentech and recently announced an
agreement with Genentech to continue collaborative development of the product
through Phase III.

    
                                       3
<PAGE>
   
     Our other potential products will also require significant additional
development, including extensive preclinical and clinical testing.
    
     The FDA has substantial discretion in both the product approval process and
manufacturing facility approval process and we cannot predict at what point, or
whether, the FDA will be satisfied with our submissions or whether the FDA will
raise questions which may be material and delay or preclude product approval or
manufacturing facility approval. As we accumulate additional clinical data, we
will submit it to the FDA, which may have a material impact on the FDA product
approval process.

   
Because All Of Our Products Are Still In Development,
We Will Require Substantial Funds To Continue;
We Cannot Be Certain That Funds Will Be Available And,
If Not Available, We May Have To Take Actions
Which Could Adversely Affect Your Rights

     If adequate funds are not available, we may have to dilute or otherwise
adversely affect the rights of existing shareholders, curtail or cease
operations or, in extreme circumstances, file for bankruptcy protection. We have
spent, and we expect to continue to spend, substantial funds in connection with:
    

     o    research and development relating to our products and production
          technologies

     o    scale-up of our production capabilities

     o    extensive human clinical trials and

     o    protection of our intellectual property.

We believe we have enough cash (including interest income) to meet our currently
anticipated needs for operating expenses, working capital, equipment
acquisitions and current research projects for at least one year. We continue to
evaluate strategic alliances, potential partnerships and financing arrangements
which would further strengthen our competitive position and provide additional
funding. However, we cannot assure you that:

     o    operations will generate meaningful funds

     o    additional agreements for product development funding can be reached

     o    strategic alliances can be negotiated or

     o    adequate additional financing will be available for us to finance our
          own development on acceptable terms, if at all.

   
Because All of Our Products Are Still In Development,
We Have Sustained Losses In The Past And We
Expect To Sustain Losses In The Future
    
     We have experienced significant losses and, as of December 31, 1998, we had
an accumulated deficit of approximately $404.3 million.

   
     For the year ended December 31, 1998, we had net losses of approximately
$47.2 million, or $1.16 per common share (basic and diluted). We expect to incur
additional losses in the future. Our ability to make profits is dependent in
large part on obtaining regulatory approval for our products and entering into
agreements for product development and commercialization. Our ability to fund
our ongoing operations is dependent on the foregoing factors and on our ability
to secure additional funds. We cannot assure you that we will ever make a profit
or that cash flow from future operations will be sufficient to meet our needs.


                                       4
<PAGE>

Because Of Our Limited Experience,
If We Cannot Find A Partner Who Has Effective Marketing
Capabilities, We May Not Be Able To Market Our Products

     Because all of our products are still in development, our marketing
experience and expertise are limited. Consequently, we may be dependent to a
large extent upon the marketing capabilities of partners we have yet to find. As
of the date of this prospectus, we have not entered into any marketing
agreements regarding our NEUPREX(R) product. Although we continue to evaluate
strategic alliances and potential partnerships for NEUPREX(R) and other
products, we cannot predict whether or when any such alliances or partnerships
will be entered into.

If Any Of Our Products Receives Regulatory Approval,
We May Not Be Able To Increase Existing Or
Acquire New Manufacturing  Capacity Sufficient
To Meet Market Demand

     We have never commercially introduced any pharmaceutical products. We
cannot assure you that the capacity of our existing manufacturing facilities can
be increased to produce sufficient quantities of our products to meet market
demand. Also, if we need additional manufacturing facilities to meet market
demand, we cannot assure you that we will successfully obtain those facilities .

If Our Patent Protection For Our Principal Products
Is Not Enforceable, We Will Not Realize Our
Profit Potential
    
   
     Because of the length of time and the expense associated with bringing new
products to the marketplace, we hold and are in the process of applying for a
number of patents in the United States and abroad to protect our products and
important processes and also have obtained or have the right to obtain exclusive
licenses to certain patents and applications filed by others. However, the
patent position of biotechnology companies generally is highly uncertain, and no
consistent policy regarding the breadth of allowed claims has emerged from the
actions of the U.S. Patent and Trademark Office with respect to biotechnology
patents. Legal considerations surrounding the validity of biotechnology patents
continue to be in transition, and we cannot assure you that historical legal
standards surrounding questions of validity will continue to be applied or that
current defenses as to issued biotechnology patents will in fact be considered
substantial in the future. Accordingly, we cannot assure you as to:
    

     o    the degree and range of protection any patents will afford against
          competitors with similar technologies

     o    if and when patents will issue

     o    whether or not others will not obtain patents claiming aspects similar
          to those covered by our patent applications or

     o    the extent to which we will be successful in avoiding any patents
          granted to others.

   
     The Patent Office has issued 33 patents to us related to our BPI-based
products, including novel compositions, their manufacture, formulation, assay
and use. In addition, we are the exclusive licensee of BPI-related patents and
applications owned by New York University and Incyte Pharmaceuticals Inc. The
Patent Office has also issued eight patents to us related to our bacterial
expression technology.
    

     If certain patents issued to others are upheld or if certain patent
applications filed by others issue and are upheld, we may require licenses from
others in order to develop and commercialize certain potential products


                                       5
<PAGE>

incorporating our technology. We cannot assure you that these licenses, if
required, will be available on acceptable terms.

     Due to the uncertainties regarding biotechnology patents, we also have
relied and will continue to rely upon trade secrets, know-how and continuing
technological advancement to develop and maintain our competitive position. All
of our employees have signed confidentiality agreements under which they have
agreed not to use or disclose any of our proprietary information. Research and
development contracts and relationships between us and our scientific
consultants and potential customers provide access to aspects of our know-how
that are protected generally under confidentiality agreements. We cannot assure
you that all confidentiality agreements will be honored or are enforceable.

   
Other Companies May Render Some Or All Of Our
Products Noncompetitive Or Obsolete

     We cannot assure you that developments by others will not render our
products or technologies obsolete or uncompetitive. Technologies developed and
utilized by the biotechnology and pharmaceutical industries are continuously and
substantially changing. Competition in the areas of genetically-engineered
DNA-based and antibody-based technologies is intense and expected to increase in
the future as a number of established biotechnology firms and large chemical and
pharmaceutical companies advance in these fields. Many of these competitors may
be able to develop products and processes competitive with or superior to our
own for many reasons, including that they may have:
    

     o    significantly greater financial resources

     o    larger research and development and marketing staffs

     o    larger production facilities

     o    entered into arrangements with, or acquired, biotechnology companies
          to enhance their capabilities or

     o    extensive experience in preclinical testing and human clinical trials.

   
     These factors may enable others to develop products and processes
competitive with or superior to our own. In addition, a significant amount of
research in biotechnology is being carried out in universities and other
non-profit research organizations. These entities are becoming increasingly
interested in the commercial value of their work and may become more aggressive
in seeking patent protection and licensing arrangements.
    
     It is possible that one or more other companies may be developing one or
more products based on BPI, and we cannot assure you that these product(s) will
not prove to be more effective than NEUPREX(R).
   
If We  Do Business Internationally , We Will
Be Subject To Additional Political, Economic and
Regulatory  Uncertainties


     We cannot assure you that we will be able to successfully operate in any
foreign market. We believe that, because the pharmaceutical industry is global
in nature, international activities will be a significant part of our future
business activities and that, when and if we are able to generate income, a
substantial portion of that income will be derived from product sales and other
activities outside the United States. Foreign regulatory agencies often
establish standards different from those in the United States, and an inability
to obtain foreign regulatory approvals on a timely basis could have an adverse
effect on our business. International operations may be limited or disrupted by:
    

                                       6
<PAGE>


     o    imposition of government controls

     o    export license requirements

     o    political or economic instability

     o    trade restrictions

     o    changes in tariffs

     o    restrictions on repatriating profits

     o    taxation and

     o    difficulties in staffing and managing international operations.

   
     Also, our business may be adversely affected by fluctuations in currency
exchange rates.

Our Research, Testing And Manufacturing
Operations May Be Disrupted By The Year 2000  Issue

     Although we have yet to complete the first phase of our Year 2000 exposure
analysis program with respect to all three of the major areas of our business
where we have identified this problem, we believe that we rely on systems,
applications and third-party relationships which, if not Y2K compliant prior to
the end of 1999, could have a material adverse impact on our operations. Because
we have not completed our contingency planning, we cannot describe what action
we would take should Y2K compliance not be achievable in time. Not having
completed our evaluation of all three areas, we cannot at this time estimate the
total potential costs of our Y2K compliance programs. The funds for these costs
will be part of our cash flow from operations and capital expenditures. Assuming
that our efforts to mitigate our Y2K exposure in any of the three areas referred
to above are unsuccessful, the most reasonably likely worst case scenario is an
interruption of ongoing clinical trials, including delays in gathering and
evaluating clinical data, and a disruption of our manufacturing and research
operations.

Because We Are a Relatively Small Biopharmaceutical
Company With Limited Resources, We May Not Be
Able To Attract And Retain Qualified Personnel,
And The Loss Of Key Personnel Could Delay Or Prevent
Achieving Our Objectives
    
   
     Our success in developing marketable products and achieving a competitive
position will depend, in part, on our ability to attract and retain qualified
scientific and management personnel, particularly in areas requiring specific
technical, scientific or medical expertise. There is intense competition for
such personnel, and we cannot assure you that we will be able to attract or
retain them. Our research, product development and business efforts would be
adversely affected by the loss of a significant group of key members of our
scientific or management staff.


Because We Engage In Human Testing, We Are Exposed
To An Increased Risk Of Product Liability Claims,
Which Would Have An Adverse Effect On Our Business
    
     The testing and marketing of medical products entails an inherent risk of
allegations of product liability. We believe that we currently have adequate
levels of insurance for our clinical trials. We will seek to obtain additional
insurance, if needed, if and when our products are commercialized; however, we
cannot 

                                       7
<PAGE>

assure you that adequate insurance coverage will be available or be
available at acceptable costs or that a product liability claim would not
materially adversely affect our business.
   
If Someone Were To Make A Hostile Bid For Our Company,
Our Shareholder Rights Agreement or Bye-Laws
May Inhibit Such A Takeover


     Our shareholder rights agreement and bye-laws contain provisions that may
have the effect of making more difficult or more costly an acquisition of
control of XOMA that has not been approved by our board of directors. The rights
agreement was designed to:

     o    protect against attempts to acquire XOMA for an inadequate or unfair
          price

     o    deter abusive tactics which induce shareholders to tender shares prior
          to realizing the full value or total potential of their investment in
          XOMA and

     o    create an incentive for a potential acquirer to negotiate the price
          and terms of an acquisition transaction in good faith with the board
          of directors so that shareholders are treated equally.
    

     See "Description of Share Capital -- Preference Shares -- Preference Share
Purchase Rights."

   
Results Of Our Operations And General Market Conditions
For Biotechnology Stocks Could Result In A
Sudden Change In The Value Of Our Stock
    

     Announcements regarding:

     o    the results of regulatory approval filings

     o    clinical trials or other testing

     o    technological innovations or new commercial products by XOMA or its
          competitors
   
     o    collaborative agreements or relationships
    
     o    government regulations

     o    developments concerning proprietary rights

     o    public concern as to safety of biotechnology

   
and other factors have historically caused, and may continue to cause,
volatility in the market price of our common shares.


If You Were To Obtain A Judgment Against Us,
It May Be Difficult To Enforce Against Us Because We
Are A Foreign Entity

     We are a Bermuda company . All or a substantial portion of our assets may
be located outside the United States. As a result, it may be difficult for
investors to enforce in United States courts judgments obtained against us. We
have irrevocably agreed that we may be served with process with respect to
actions based on offers and sales of securities made hereby in the United States
by serving Christopher J. Margolin, c/o XOMA Ltd., 2910 Seventh Street,
Berkeley, California 94710, our United States agent appointed for that purpose.
XOMA has been advised by its Bermuda counsel, Conyers Dill & Pearman, that there
is doubt as to whether Bermuda courts would enforce judgments of United States
courts obtained in (a) actions against such 


                                       8
<PAGE>

persons or XOMA that are predicated upon the civil liability
provisions of the Securities Act or (b) original actions brought in Bermuda
against XOMA or such persons predicated upon the Securities Act. There is no
treaty in effect between the United States and Bermuda providing for such
enforcement, and there are grounds upon which Bermuda courts may not enforce 
judgments of United States courts. Certain remedies available under the United 
States federal securities laws may not be allowed in Bermuda courts as contrary
to that nation's policy.
    


                                       9
<PAGE>

                INCORPORATION OF INFORMATION WE FILE WITH THE SEC
   
     The following documents filed by XOMA with the SEC pursuant to the
Securities Exchange Act are "incorporated by reference" in this prospectus,
which means we can disclose important information to you by referring you to
these documents and they are considered to be a part of this prospectus:
    
          (1) annual report on Form 10-K for the fiscal year ended December 31,
     1998 (file no. 0-14710);

          (2) current report on Form 8-K dated December 29, 1998 filed on
     January 6, 1999 (file no. 0-14710);

          (3) current report on Form 8-K dated January 28, 1999 filed on January
     29, 1999, as amended by an amendment on Form 8-K/A dated February 18, 1999
     filed on February 18, 1999 (file no. 0-14710); and

          (4) the description of the common stock of XOMA Corporation, which was
     our name as a Delaware corporation before our recent change of legal
     domicile to Bermuda, in the registration statement on Form 8-A dated June
     9, 1986 filed on June 11, 1986 under Section 12 of the Securities Exchange
     Act, including any amendment or report for the purpose of updating such
     description (registration no. 33-4793).

     All documents filed by XOMA with the SEC pursuant to Section 13(a), 13(c),
14 or 15(d) of the Securities Exchange Act after the date of this prospectus and
before all of the common shares offered by this prospectus have been sold are
deemed to be incorporated by reference in, and to be part of, this prospectus
from the date any such document is filed.

     Any statements contained in a document incorporated by reference in this
prospectus are deemed to be modified or superseded for purposes of this
prospectus to the extent that a statement contained in this prospectus (or in
any other subsequently filed document which also is incorporated by reference in
this prospectus) modifies or supersedes such statement. Any statement so
modified or superseded is not deemed to constitute a part of this prospectus
except as so modified or superseded.


                                       10
<PAGE>


                 DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

     Some of the statements made in this prospectus are forward-looking in
nature, including our product development plans, plans concerning the
commercialization of products and other statements that are not historical
facts. The occurrence of the events described, and the achievement of the
intended results, depend on many events, some or all of which are not
predictable or not within our control. Actual results may differ materially from
those anticipated in any forward-looking statements. Many risks and
uncertainties are inherent in the biopharmaceutical industry. Others are more
specific to our business. Many of the significant risks related to our business
are described in this prospectus. These include, among others, risks associated
with technology and product development, sufficiency and availability of funds,
marketing risks, patent and intellectual property matters, regulatory and
manufacturing issues, risks associated with competition from other companies and
the Year 2000 issue. Many of these risks are discussed further in "Risk
Factors."

                              --------------------

     We have not authorized any dealer, salesperson or other person to give you
written information other than this prospectus or to make representations as to
matters not stated in this prospectus. You must not rely on unauthorized
information. This prospectus is not an offer to sell these securities or our
solicitation of your offer to buy the securities in any jurisdiction where that
would not be permitted or legal. Neither the delivery of this prospectus nor any
sales made hereunder after the date of this prospectus should imply that the
information contained in this prospectus or the affairs of XOMA have not changed
since the date of this prospectus.


                                       11
<PAGE>


   
                                      XOMA
    

     XOMA is a biopharmaceutical company developing products to treat
infections, infectious complications (such as those that follow traumatic injury
and surgery), and immunologic and inflammatory disorders. Our current product
development programs include:

   
     -    NEUPREX(R) (rBPI21), a genetically-engineered fragment of a human
          protein known as BPI and XOMA's lead BPI-derived product. The product
          is currently in Phase III clinical trials in two indications and has
          been in earlier-stage clinical trials in three additional indications.
    

     -    I-PREX(TM), a proprietary topical formulation of rBPI21 for the
          treatment of ophthalmic disorders, which is undergoing preclinical
          testing as a treatment for corneal injuries and infections, including
          ulcerations and transplants.
   
     -    Mycoprex(TM), a fungicidal compound derived from BPI that is currently
          in preclinical product development. It is targeted at systemic (i.e.,
          internal) fungal infections.
    
     -    hu1124 (anti-CDlla), a humanized antibody product being developed in
          collaboration with Genentech, which originally discovered the antibody
          and characterized it as anti-CD11a. The hull24 product has completed a
          Phase II clinical trial for psoriasis.

   
     Management believes XOMA's cash position and resulting interest income are
sufficient to finance XOMA's currently anticipated needs for operating expenses,
working capital, equipment acquisitions and current research projects for at
least one year. XOMA continues to evaluate strategic alliances, potential
partnerships and financing arrangements which would further strengthen its
competitive position and provide additional funding. XOMA cannot predict whether
or when any such alliances, partnerships or arrangements will be consummated or
whether additional funding will be available when required and on terms
acceptable to XOMA.
    


                                       12
<PAGE>


              PRICE RANGE OF COMMON SHARES AND DIVIDEND INFORMATION

   
     XOMA's common shares (such common shares and the common stock of our
predecessor Delaware corporation are referred to in this prospectus as the
common shares) trade on the Nasdaq National Market under the symbol "XOMA." The
following table sets forth the quarterly range of high and low reported sale
prices of the common shares on the Nasdaq National Market for the periods
indicated:
    

                                        High                       Low
                                        ----                       ---
    1997:
                 First Quarter         $7 1/4                   $4 15/16
                 Second Quarter       5 11/16                      3 1/8
                 Third Quarter          8 1/2                      4 5/8
                 Fourth Quarter         8 1/2                      4 7/8
    1998:
                 First Quarter         $6 1/2                    $4 5/16
                 Second Quarter             6                      4 1/4
                 Third Quarter              5                    1 27/32
                 Fourth Quarter             5                    1 13/16
    1999:
   
                 First Quarter        $4 3/16                    2 13/16
                 Second Quarter
                   (through May 5)    3 11/32                      2 1/2

     On May 5, 1999 the last reported sale price of the common shares as
reported on the Nasdaq National Market was US$3.00 per share. As of May 5, there
were approximately 4,323 record holders of XOMA's common shares.

     XOMA has not paid dividends on its common equity. XOMA currently does not
intend to pay dividends and intends to retain any earnings for use in its
business and the financing of its capital requirements for the foreseeable
future. The payment of any future cash dividends on XOMA's common shares will
necessarily be dependent upon the earnings and financial needs of XOMA, along
with applicable legal and contractual restrictions.
    


                                       13
<PAGE>



                              SELLING SHAREHOLDERS

   
     In January 1999, we entered into a financing transaction involving the
issuance of common shares and common share purchase warrants to Advantage Fund
II Ltd. and Koch Investment Group Limited, which we previously announced. The
shares initially issued in the 1999 private placement were issued pursuant to
separate subscription agreements with each investor, are held by an escrow agent
and may be released at the discretion of the investors beginning on the
effective date of the registration statement of which this prospectus is a part.
The shares were issued into escrow to facilitate determination of the number of
additional shares that might be issued in the future. As described below, it is
only the number of shares held in escrow on a reset date that is subject to
adjustment.

     The subscription agreements provide that we could be required to issue
additional shares to the investors if the average market price of our common
shares (which is defined as 89% of the average of the closing bid prices for the
five trading days during the 25 immediately preceding trading days on which the
lowest closing bid prices occurred) on August 31, 1999 is less than a floor
price of $5.85008. If the average market price is lower, then we will issue to
each investor adjustment shares, if any, equal to (i) the quotient obtained by
dividing (x) the product of the number of shares initially held in escrow on
behalf of each investor on such date (and not previously withdrawn) times
$5.85008 by (y) the average market price, less (ii) such number of shares
initially held in escrow on behalf of each investor on such date (and not
previously withdrawn). Additional adjustment shares will be required to be
issued into escrow for the selling shareholders on reset dates every 90 days
after August 31, 1999 until the earlier of January 2002 or the date when all
shares are released from escrow, based on a similar formula, if the average
market price is less than the average market price on the preceding reset date.
To the extent that the number of shares issuable under the foregoing formulas on
any such reset date is negative, those shares will be returned by the escrow
agent to us and cancelled. The number of adjustment shares may increase under
certain conditions primarily involving our failure to keep the registration
statement of which this prospectus forms a part available for use for resales of
the shares. We may be required to repurchase the shares held in and recently
released from escrow in the event of (1) a default of our material obligations
under the subscription agreements, (2) the continued unavailability of the
registration statement, (3) the absence of reported prices for the common shares
on the New York or American Stock Exchanges or the Nasdaq National or Nasdaq
SmallCap Markets, (4) a suspension of trading in the common shares, or (5) a
change of control of XOMA; we may, however, elect to issue additional shares in
lieu of repurchasing such shares if the circumstances triggering the repurchase
obligation are not solely within our control.

     Wharton Capital Partners Ltd. received warrants to purchase 64,000 common
shares for its role in facilitating the 1999 private placement. Separately,
Brown Simpson-ORD Investments, LLC received warrants to purchase 75,000 common
shares for providing general financial advisory services.

     The following table sets forth certain information regarding the ownership
of common shares by the selling shareholders as of May 5, 1999, and the number
of common shares covered by this prospectus:
    


                                       14
<PAGE>
<TABLE>
<CAPTION>
   
                                                                                                     Ownership
                                                Ownership                                         of Common Shares
                                            of Common Shares                             after the Offering (assuming all
                                          prior to the Offering                              offered shares are  sold)
                                          ---------------------                          -----------------------------------
    
                                                                    Number
Name of                                          Number             of Shares            Number of                Percent
Selling Shareholders                            of Shares           Offered              Shares                   of Class
- ----------------------------------------  -----------------------   -------------------  --------------------     ----------

<S>                                                 <C>             <C>                         <C>               <C>
Advantage Fund II Ltd.                              1,336,565(1)    2,533,130(2)                0                 0%
Koch Investment Group Limited                         954,689(1)    1,809,378(3)                0                 0%
Wharton Capital Partners Ltd.                          64,000(4)       64,000                   0                 0%
Brown Simpson-ORD Investments, LLC                    114,612(5)       75,000              39,612            less than 1%

</TABLE>

   
(1)  Consists of (a) the initial number of shares issued to this selling
     shareholder in the 1999 private placement and (b) the number of shares
     issuable upon exercise of the 1999 warrants (as described below) issued to
     this selling shareholder.

(2)  Consists of (a) 1,196,565 shares issued to Advantage Fund II Ltd., (b)
     140,000 shares issuable upon exercise of the 1999 warrants, and (c)
     1,196,565 adjustment shares which we agreed to register and which may be
     issued to this selling shareholder in the future pursuant to its
     subscription agreement.

(3)  Consists of (a) 854,689 shares issued to Koch Investment Group Limited, (b)
     100,000 shares issuable upon exercise of the 1999 warrants, and (c) 854,689
     adjustment shares which we agreed to register and which may be issued to
     this selling shareholder in the future pursuant to its subscription
     agreement.

(4)  Consists of shares issuable upon exercise of the 1999 warrants. Excludes
     (i) 53,654 shares issuable upon exercise of the 1997 warrants (as described
     below), and (ii) 22,692 shares issuable upon exercise of the 1998 warrants
     (as described below), all of which are beneficially owned by Michael
     Arnouse, a principal of Wharton Capital. Wharton Capital disclaims
     beneficial ownership of such shares.

(5)  Consists of 75,000 shares issuable upon exercise of the 1999 warrants,
     37,412 shares issuable upon exercise of the 1997 warrants, and 2,200 shares
     issuable upon exercise of the 1998 warrants.
    


                                       15
<PAGE>



                          DESCRIPTION OF SHARE CAPITAL

   
     The following statements with respect to XOMA's share capital are subject
to the detailed provisions of XOMA's memorandum of continuance and bye-laws.
These statements do not purport to be complete and, while XOMA believes the
descriptions of the material provisions of the memorandum of continuance and the
bye-laws incorporated by reference are accurate statements with respect to such
material provisions, such statements are subject to the detailed provisions in
the memorandum of continuance and the bye-laws, to which reference is hereby
made for a full description of such provisions.
    

COMMON SHARES

General

   
     The memorandum of continuance and the bye-laws provide that XOMA's
authorized common share capital is limited to 70,000,000 common shares, par
value U.S. $.0005 per share. As of May 5, 1999, there were 50,231,987 common
shares outstanding.
    

Voting

   
     The holders of common shares are entitled to one vote per share. All
actions submitted to a vote of shareholders shall be voted on by the holders of
common shares, voting together as a single class (together with the Series A
preference shares (as described below), if any), except as provided by law.
    

Dividends

   
     Holders of common shares are entitled to participate, on a share for share
basis, with the holders of any other common shares outstanding, with respect to
any dividends declared by the board of directors of XOMA, subject to the rights
of holders of preference shares. Dividends will generally be payable in U.S.
dollars. XOMA has not paid cash dividends on the common shares. XOMA currently
does not intend to pay dividends and intends to retain any earnings of XOMA for
use in its business and the financing of its capital requirements for the
foreseeable future. The payment of any future cash dividends on the common
shares is necessarily dependent upon its earnings and financial needs of XOMA,
along with applicable legal and contractual restrictions.
    

Liquidation

   
     On a liquidation of XOMA, holders of common shares will be entitled to
receive any assets remaining after the payment of XOMA's debts and the expenses
of the liquidation, subject to such special rights as may be attached to any
other class of shares.
    

Redemption

   
     The common shares are not subject to redemption either by XOMA or the
holder thereof.
    

Variation Of Rights

   
     Under XOMA's bye-laws, if at any time XOMA's share capital is divided into
different classes of shares, the rights attached to any class (unless otherwise
provided by the terms of the issue of the shares of that class) may be varied
with the consent in writing of the holders of a majority of the issued shares of
that class either in writing or with the sanction of a resolution passed at a
separate general meeting.
    


                                       16
<PAGE>

PREFERENCE SHARES

General

   
     Under its memorandum of continuance and bye-laws, XOMA has the authority to
issue 1,000,000 preference shares, par value U.S. $.05 per share. Of these,
650,000 preference shares have been designated Series A Cumulative Preference
Shares, 7,500 preference shares have been designated Convertible Preference
Shares, Series B and 1,250 preference shares have been designated Convertible
Preference Shares, Series C. Under the bye-laws, subject to the special rights
attaching to any class of shares of XOMA not being varied and to any resolution
approved by the holders of 75% of the issued shares entitled to vote in respect
thereof, the board of directors of XOMA may establish one or more classes or
series of preference shares having the number of shares, designations, relative
voting rights, dividend rates, liquidation and other rights, preferences and
limitations that the board of directors fixes without any shareholder approval.
    

Preference Share Purchase Rights

   
     Pursuant to XOMA's shareholder rights agreement XOMA issued one preference
share purchase right (a right) for each outstanding common share. Each right
entitles the holder to purchase from XOMA a unit consisting of one one-hundredth
of a share (a unit) of Series A preference shares at a cash exercise price of
$30.00 per unit, subject to adjustment.

     The rights are attached to all outstanding common shares, including the
common shares offered hereby. The rights will separate from the common shares
and will be distributed to holders of common shares upon the earliest of (i) ten
business days after the first public announcement that a person or group of
affiliated or associated persons (an acquiring person) has acquired beneficial
ownership of 20% or more of the common shares then outstanding (the date of said
announcement being referred to as the share acquisition date), (ii) ten business
days following the commencement of a tender offer or exchange offer that would
result in a person or group of persons becoming an acquiring person or (iii) the
declaration by the board of directors of XOMA that any person is an adverse
person (the earliest of such dates, the distribution date).

     The board of directors of XOMA may generally declare a person to be an
adverse person after a declaration that such person has become the beneficial
owner of 10% or more of the outstanding common shares and a determination that
(a) such beneficial ownership by such person is intended to cause or is
reasonably likely to cause XOMA to repurchase the common shares owned by such
person or to cause XOMA to enter into other transactions not in the best
long-term interests of XOMA or (b) such beneficial ownership is reasonably
likely to cause a material adverse impact on the business or prospects of XOMA.
The rights are not exercisable until the distribution date and will expire on
December 31, 2002, unless previously redeemed or exchanged by XOMA.

     In the event that a person becomes an acquiring person or the board of
directors of XOMA determines that a person is an adverse person, each holder of
a right will thereafter have the right to receive upon exercise that number of
units of Series A preference shares having a market value of two times the
exercise price of the rights. If at any time following the share acquisition
date, (i) XOMA consolidates with, or merges or amalgamates with and into, any
person, and XOMA is not the surviving corporation; (ii) any person consolidates
or amalgamates with XOMA, or merges or amalgamates with and into XOMA and XOMA
is the continuing or surviving corporation of such transaction and, in
connection with such transaction, all or part of the common shares are changed
into or exchanged for other securities of any other person or cash or any other
property, or (iii) 50% or more of XOMA's assets are sold or otherwise
transferred, provision shall be made so that each holder of a right shall
thereafter have the right (a merger right) to receive, upon exercise, common
shares of the acquiring company having a market value equal to two times the
exercise price of the rights. Rights that are beneficially owned by an acquiring
or adverse person may, under certain circumstances, become null and void.


                                       17
<PAGE>

     At any time after a person becomes an acquiring person or the board of
directors of XOMA determines that a person is an adverse person, the board of
directors of XOMA may exchange all or any part of the then outstanding and
exercisable rights for common shares or units of Series A preference shares at
an exchange ratio of one common share or one unit of Series A preference shares
per right. Notwithstanding the foregoing, the board of directors of XOMA
generally will not be empowered to effect such exchange at any time after any
person becomes the beneficial owner of 50% or more of the common shares then
outstanding.

     The rights may be redeemed in whole, but not in part, at a price of U.S.
$.001 per right by the board of directors of XOMA at any time prior to the date
on which a person is declared to be an adverse person, the tenth business day
after the share acquisition date, the occurrence of an event giving rise to the
merger right or the expiration date of the rights agreement.
    

The Series A Preference Shares

   
     There are no Series A preference shares outstanding. Pursuant to the rights
of the Series A preference shares, subject to the rights of holders of any
shares of any series of preference shares ranking prior and superior (such as
the Series C preference shares), the holders of Series A preference shares are
entitled to receive, when, as and if declared by the board of directors of XOMA
out of funds legally available for the purpose, quarterly dividends payable in
cash on the first day of March, June, September and December in each year,
commencing on the first dividend payment date after the first issuance of a
share or fraction of a share of Series A preference shares, in an amount per
share equal to the greater of (a) $1.00 or (b) 100 times the aggregate per share
amount of all cash dividends, plus 100 times the aggregate per share amount of
all non-cash dividends or other distributions, other than a dividend payable in
common shares, declared on the common shares since the immediately preceding
dividend payment date, or, with respect to the first dividend payment date,
since the first issuance of Series A preference shares.

     In addition to any other voting rights required by law, holders of Series A
preference shares shall have the right to vote on all matters submitted to a
vote of shareholders of XOMA with each share of Series A preference shares
entitled to 100 votes. Except as otherwise provided by law, holders of Series A
preference shares and holders of common shares shall vote together as one class
on all matters submitted to a vote of shareholders of XOMA.

     Unless otherwise provided in the rights attaching to a subsequently
designated series of preference shares of XOMA, the Series A preference shares
shall rank junior to any other series of preference shares as to the payment of
dividends and distribution of assets on liquidation, dissolution or winding-up
and shall rank senior to the common shares. Upon any liquidation, dissolution or
winding-up of XOMA, no distributions shall be made to holders of shares ranking
junior to the Series A preference shares unless, prior thereto, the holders of
Series A preference shares shall have received an amount equal to accrued and
unpaid dividends and distributions, whether or not declared, to the date of such
payment, plus an amount equal to the greater of (1) $100.00 per share or (2) an
aggregate amount per share equal to 100 times the aggregate amount to be
distributed per share to holders of common shares or to the holders of shares
ranking on parity with the Series A preference shares, except distributions made
ratably on the Series A preference shares and all other such parity shares in
proportion to the total amount to which the holders of all such shares are
entitled upon such liquidation, dissolution or winding-up.

     If XOMA shall enter into any consolidation, amalgamation, merger,
combination or other transaction in which common shares are exchanged for or
changed into cash, other securities and/or any other property, then any Series A
preference shares outstanding shall at the same time be similarly exchanged or
changed in an amount per share equal to 100 times the aggregate amount of cash,
securities and/or other property, as the case may be, into which or for which
each common share is changed or exchanged.

     The Series A preference shares shall not be redeemable.


                                       18
<PAGE>

    

The Series B Preference Shares

   
     There are no Series B preference shares outstanding. The 7,500 Series B
preference shares have been designated for issuance upon conversion of the
convertible subordinated loans to XOMA made and to be made by Genentech in
connection with the funding of the XOMA's development costs for hull24. Such
loans are and will be convertible into Series B preference shares upon the
occurrence of certain events relating to certain regulatory approvals, payment
defaults, prepayments and other circumstances. Pursuant to the rights of the
Series B preference shares, the holders of Series B preference shares will not
be entitled to receive any dividends on the Series B preference shares.

     The Series B preference shares will rank senior with respect to rights on
liquidation, winding-up and dissolution of XOMA to all classes of common shares.
Upon any voluntary or involuntary liquidation, dissolution or winding-up of
XOMA, holders of Series B preference shares will be entitled to receive $10,000
per share of Series B preference shares before any distribution is made on the
common shares. The holders of Series B preference shares will have no voting
rights, except as required under Bermuda law.

     The holders of Series B preference shares will have the right to convert
Series B preference shares into common shares at a conversion price equal to the
current market price of the common shares (determined as provided below). The
current market price will be determined (a) for Series B preference shares
issued in connection with a conversion of one or more of the convertible
subordinated loans upon certain regulatory approvals, payment defaults or in
certain other circumstances, as of the first date on which such a conversion
occurs, and (b) for Series B preference shares issued in connection with certain
prepayments of one or more of the convertible subordinated loans or a conversion
thereof in certain other circumstances, as of the date of the issuance of such
Series B preference shares.

     The Series B preference shares will be automatically converted into common
shares at its then effective conversion rate immediately upon the transfer by
the initial holder to any third party which is not an affiliate of such holder.

     XOMA will have the right, at any time and from time to time, to redeem any
or all Series B preference shares for cash in an amount equal to the conversion
price multiplied by the number of common shares into which each such share of
Series B preference shares would then be convertible.
    

The Series C Preference Shares

   
     As of May 5, 1999, there were 360 Series C preference shares outstanding.
Pursuant to the rights of the Series C preference shares, the holders thereof
will be entitled to receive, when and as declared by the board of directors of
XOMA out of funds legally available therefor, cumulative dividends at a rate per
share (as a percentage of the stated value per share) equal to 5% per annum.
Dividends will be payable, at the option of XOMA, in cash or common shares
(subject to certain restrictions thereon). In addition, XOMA may elect not to
declare or make payment of any dividend, in which event the accrued and unpaid
dividends shall be calculated and paid at the time of conversion, as described
below.

     The Series C preference shares will rank senior with respect to rights on
liquidation, dissolution or winding-up of XOMA to the common shares. Upon any
voluntary or involuntary liquidation, dissolution or winding-up of XOMA, holders
of Series C preference shares will be entitled to receive U.S. $10,000 per
share, plus accrued but unpaid dividends, before any distribution or payment is
made on the common shares or any preference shares of XOMA ranking junior as to
liquidation rights to the Series C preference shares. Except as may be required
by law and except with respect to certain actions which may adversely affect the
holders of Series C preference shares, the holders of Series C preference shares
will not be entitled to vote on any matter submitted to a vote of shareholders
of XOMA.


                                       19
<PAGE>

     The holders of Series C preference shares will have the right to convert
Series C preference shares into common shares at a conversion price equal to 88%
of the average per share market price of the common shares for the five (5)
trading days immediately preceding the date of conversion, provided that the
current holders of the Series C preference shares have agreed that in no event
shall any such holder be entitled to convert any Series C preference shares (or
exercise any 1998 warrants to the extent the issuance of common shares upon a
proposed conversion (or exercise) would result in such holder beneficially
owning more than 4.999% of the outstanding common shares, absent certain
defaults by XOMA; and provided, further, that in the event that on any
conversion date the conversion of all the outstanding Series C preference shares
upon surrender thereof, together with all common shares previously issued upon
conversion of Series C preference shares and the Convertible Preferred Stock,
Series G and the Convertible Preferred Stock, Series H of XOMA and in respect of
payment of dividends thereon, would require the issuance of a number of common
shares in excess of 20% of the number of such shares outstanding on June 26,
1998, XOMA shall, at its option, either redeem all of such holder's Series C
preference shares not convertible by reason of the limitation described in this
proviso at a redemption price per share based on the five day trailing average
market price at the time of conversion or at the time of redemption, whichever
is greater, or, after obtaining shareholder approval, convert such Series C
preference shares into common shares; provided, that, if XOMA elects to seek
shareholder approval, the holders of a majority of the outstanding Series C
preference shares may request, in lieu of such approval, that XOMA redeem the
Series C preference shares as set forth above. XOMA is seeking shareholder
approval to issue common shares on conversion of Series C preference shares in
excess of the 20% threshold at its annual meeting of shareholders scheduled for
May 25, 1999. In addition, subject to the limitation described in the second
proviso of the second preceding sentence, XOMA has the right, so long as it is
in compliance with its obligations to the holders of the Series C preference
shares and the related registration statement is then effective, exercisable at
any time on or after June 26, 2001, to require the holders thereof to convert
all or a portion of their Series C preference shares into common shares at the
then applicable conversion price.

     The holders of the Series C preference shares will be entitled to redeem
their Series C preference shares at the redemption price described in the
preceding paragraph if the common shares are no longer listed for, or are
suspended from, trading on Nasdaq or any other principal market or exchange for
such shares (other than as a result of the suspension of trading in securities
generally or temporarily pending release of material information) for five
trading days in the aggregate.
    

WARRANTS

   
     XOMA issued common stock purchase warrants in September 1996. Each of the
54,870 unexpired 1996 warrants outstanding entitles the holder thereof to
purchase one common share, subject to anti-dilution adjustments. A holder may
exercise the 1996 warrants at an exercise price of $7.29 per share on or before
September 24, 1999.

     XOMA issued 485,879 common stock purchase warrants in August 1997. Each
1997 warrant outstanding entitles the holder thereof to purchase one common
share, subject to anti-dilution adjustments. A holder may exercise the 1997
warrants at an exercise price of $10.00 per share on or before August 14, 2000.

     XOMA issued 618,681 common stock purchase warrants in June 1998. Each 1998
warrant outstanding entitles the holder thereof to purchase one common share,
subject to anti-dilution adjustments. A holder may exercise the 1998 warrants at
an exercise price of $7.00 per share on or before June 26, 2001.

     XOMA issued 250,000 common stock purchase warrants to Incyte in July 1998.
Each Incyte warrant outstanding entitles the holder thereof to purchase one
common share, subject to anti-dilution adjustments. A holder may exercise the
Incyte warrants at an exercise price of $6.00 per share on or before July 9,
2008 or earlier upon the related license becoming fully paid up.


                                       20
<PAGE>

     XOMA issued 379,000 warrants to purchase common shares in January 1999 in
connection with the 1999 private placement and in March 1999 to one of its
financial advisors. Each 1999 warrant entitles the holder thereof to purchase
one common share, subject to anti-dilution adjustments. A holder may exercise
the 1999 warrants at an exercise price of $5.85008 per share on or before
January 29, 2004.

     None of the warrants described above have been registered under the
Securities Act and none may be transferred except pursuant to an effective
registration statement under the Securities Act or pursuant to an exception from
registration thereunder. Additionally, all of the warrants contain certain
restrictions on their transfer. XOMA is not obligated and does not intend to
register the warrants under the Securities Act.
    

                              PLAN OF DISTRIBUTION

   
     Any or all of the common shares being offered by this prospectus may be
sold from time to time to purchasers directly by any selling shareholder or by
pledgees, donees, transferees or other successors in interest. Alternatively,
any selling shareholder may from time to time offer the common shares through
underwriters, dealers or agents who may receive compensation in the form of
underwriting discounts, concessions or commissions from such selling shareholder
and/or the purchasers of common shares for whom they may act as agent. Any such
selling shareholder, and any such underwriters, dealers or agents that
participate in the distribution of common shares, may be deemed to be
underwriters, and any profit on the sale of the common shares by them and any
discounts, commissions or concessions received by them may be deemed to be
underwriting discounts and commissions under the Securities Act. Any such common
shares may be so offered or sold in the open market, on the Nasdaq National
Market, in privately negotiated transactions, in an underwritten offering, or a
combination of such methods, at market prices prevailing at the time of sale, at
prices related to such prevailing market prices or at negotiated prices. To the
extent required, the names of the selling shareholders, the number common shares
to be sold, purchase price, public offering price, the name of any agent, dealer
or underwriter and any applicable commission or discount or other items
constituting compensation or indemnification arrangements with respect to a
particular offering will be set forth in an accompanying prospectus supplement.
XOMA will receive no proceeds from the sale by any selling shareholder of the
common shares offered by this prospectus.

     In connection with distributions of the common shares, any selling
shareholder may enter into hedging transactions with broker-dealers and the
broker-dealers may engage in short sales of the common shares in the course of
hedging the positions they assume with such selling shareholder. Any selling
shareholder also may sell the common shares short and deliver the common shares
to close out such short positions. Any selling shareholder also may enter into
option or other transactions with broker-dealers that involve the delivery of
the common shares to the broker-dealers, which may then resell or otherwise
transfer such common shares. Any selling shareholder also may loan or pledge the
common shares to a broker-dealer and the broker-dealer may sell the common
shares so loaned or upon a default may sell or otherwise transfer the pledged
common shares.

     All reasonable expenses (other than underwriting discounts and commissions,
other fees and expenses of investment bankers and brokerage commissions)
incurred in connection with the registration of the common shares offered by
this prospectus, estimated to be approximately $70,000, will be borne by XOMA.
As and when XOMA is required to update this prospectus, it may incur additional
expenses in excess of this estimated amount.

     Any common shares offered by this prospectus that qualify for sale pursuant
to Rule 144 under the Securities Act may be sold under such rule rather than
pursuant to this prospectus.
    

                                  LEGAL OPINION

   
     The validity of the common shares to which this prospectus relates has been
passed upon for XOMA by Conyers Dill & Pearman, located in Hamilton, Bermuda.
    


                                       21
<PAGE>

                                     EXPERTS

   
     The consolidated financial statements of XOMA Ltd. at December 31, 1998,
and for the year then ended, appearing in this prospectus and registration
statement have been audited by Ernst & Young LLP, independent auditors, as set
forth in their report thereon appearing elsewhere herein, and are included in
reliance upon such report given on the authority of such firm as experts in
accounting and auditing.

     The financial statements of XOMA Ltd. for the periods through December 31,
1997 incorporated by reference in this prospectus and elsewhere in the
registration statement, to the extent and for the periods indicated in their
report, have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their report with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in giving said report.
    

                       WHERE YOU CAN GET MORE INFORMATION

   
     This prospectus is part of a registration statement that we have filed with
the SEC. The registration statement contains exhibits and other information not
included in this prospectus. At your request, we will provide you, without
charge, a copy of any documents incorporated by reference in, or included as
exhibits to, our registration statement. If you would like more information,
write or call us at:
    

                                    XOMA Ltd.
                               2910 Seventh Street
                               Berkeley, CA 94710
                            Telephone: (510) 644-1170

     XOMA files annual, quarterly and current reports, proxy statements and
other information with the SEC. You may read and copy any reports, statements
and other information we file at the SEC's public reference room in Washington
D.C. You can request copies of these documents, upon payment of a duplicating
fee, by writing to the SEC. Please call the SEC at 1-800-SEC-0330 for further
information on the operation of the public reference rooms. XOMA's SEC filings
are also available to the public on the SEC Internet site at http://www.sec.gov.


                                       22
<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution

     The estimated expenses in connection with this offering are as follows:

                                                                      Amount
                                                                    to be Paid
                                                                    ----------
SEC registration fee .............................................     $3,816
Nasdaq fee .......................................................     17,500
Legal fees and expenses (including Blue Sky fees and expenses)....     35,000
Accounting fees and expenses .....................................      6,000
Miscellaneous ....................................................      7,684
                                                                        -----
         Total ...................................................    $70,000

Item 15.  Indemnification of Directors and Officers

     Under Bermuda law, a company is permitted to indemnify any officer or
director, out of the funds of the company, against (i) any liability incurred by
him or her in defending any proceedings, whether civil or criminal, in which
judgment is given in his or her favor, or in which he or she is acquitted, or in
connection with any application under relevant Bermuda legislation in which
relief from liability is granted to him or her by the court and (ii) any loss or
liability resulting from negligence, default, breach of duty or breach of trust,
save for his or her fraud and dishonesty.

   
     The bye-laws of XOMA provide for the indemnity by XOMA of the officers,
directors and employees of XOMA to the fullest extent permitted by law.

     Expenses (including attorneys' fees) incurred by an officer or director of
XOMA in defending any civil, criminal, administrative or investigative action,
suit or proceeding shall be paid by XOMA in advance of the final disposition of
such action, suit or proceeding upon receipt of an undertaking by or on behalf
of such director or officer to repay such amount if it shall ultimately be
determined that he is not entitled to be indemnified by XOMA pursuant to the
Securities Act of 1933.

     An officer or director of XOMA shall not be personally liable to XOMA or
its shareholders for monetary damages for any breach of fiduciary duty as a
director or officer, except to the extent that such limitation is prohibited by
the Securities Act of 1933.

     The indemnification and advancement of expenses and the limitation of
liability provided by the bye-laws shall not be deemed exclusive of any other
rights which any officer, director or employee, as such, may have or hereafter
acquire under the Securities Act of 1933, any other provision of the bye-laws,
or any agreement or otherwise. Any repeal or modification of the aforementioned
provisions of the bye-laws shall not adversely affect any right or protection
existing at the time of such repeal or modification.
    


                                      II-1
<PAGE>


Item 16.  Exhibits and Financial Statement Schedules

(a)      Exhibits

     Exhibit
     Number
     ------

     3.1  Memorandum of Continuance of XOMA Ltd. (Exhibit 3.4)(1)

     3.2  Bye-Laws of XOMA Ltd. (Exhibit 3.5) (1)

     4.1  Stockholder Rights Agreement dated as of October 27, 1993 by and among
          XOMA Corporation and First Interstate Bank of California as Rights
          Agent (Exhibit 1) (2)

     4.2  Form of Resolution Regarding Preferences and Rights of Series A
          Preference Shares (Exhibit 4.2) (1)

     4.3  Form of Resolution Regarding Preferences and Rights of Series B
          Preference Shares (Exhibit 4.3) (1)

     4.4  Form of Resolution Regarding Preferences and Rights of Series C
          Preference Shares (Exhibit 4.4) (1)

     4.5  Form of Common Stock Purchase Warrant (1996 Warrants) (Exhibit 4.9)
          (3)

     4.6  Form of Common Stock Purchase Warrant (1997 Warrants) (Exhibit 3) (4)

     4.7  Form of Common Stock Purchase Warrant (1998 Warrants) (Exhibit 3) (5)

     4.8  Form of Common Stock Purchase Warrant (Incyte Warrants) (Exhibit 2)
          (6)

     4.9  Form of Common Share Purchase Warrant (1999 Warrants) (Exhibit 5) (7)

     5.1  Opinion of Conyers Dill & Pearman* - 10.1 Form of Subscription
          Agreement, dated as of January 28, 1999, by and between XOMA and the
          purchasers of Common Shares in the 1999 Private Placement (Exhibit 2)
          (7)

     10.2 Form of Registration Rights Agreement, dated as of January 28, 1998,
          by and between XOMA and the purchasers of Common Shares in the 1999
          Private Placement (Exhibit 3) (7)

     10.3 Form of Escrow Agreement, dated as of January 28, 1998, by and between
          XOMA, Brian W. Pusch, as Escrow Agent and the purchasers of Common
          Shares in the 1999 Private Placement (Exhibit 4) (7)
   
     23.1 Consent of Ernst & Young LLP, Independent Auditors

     23.2 Consent of Arthur Andersen LLP, Independent Public Accountants


                                      II-2

<PAGE>

     23.3 Consent of Conyers Dill & Pearman (included in Exhibit 5.1)

     24.1 Power of Attorney*
    

- --------------------

*    Previously filed

(1)  Incorporated by reference to the referenced exhibit to XOMA's Registration
     Statement on Form S-4 filed November 27, 1998, as amended (File No.
     333-68045).

(2)  Incorporated by reference to the referenced exhibit to XOMA Corporation's
     Current Report on 8-K dated October 27, 1993 filed November 2, 1993 (File
     No. 0-14710).

(3)  Incorporated by referenced to the referenced exhibit to XOMA's Registration
     Statement on Form S-3 filed June 28, 1998 (File No. 333-07263).

(4)  Incorporated by reference to the referenced exhibit to XOMA's Current
     Report on Form 8-K dated August 13, 1997 filed August 18, 1997 (File No.
     0-14710).

(5)  Incorporated by reference to the referenced exhibit to XOMA's Current
     Report on Form 8-K dated June 28, 1998 filed June 29, 1998 (File No.
     0-14710).

(6)  Incorporated by reference to the referenced exhibit to XOMA's Current
     Report on Form 8-K dated July 9, 1998 filed July 16, 1998 (File No.
     0-14710).

(7)  Incorporated by reference to the referenced exhibit to XOMA's Current
     Report on Form 8-K dated January 28, 1999 filed January 29, 1999, as
     amended (File No. 0-14710).

Item 17.  Undertakings

       The undersigned registrant hereby undertakes:

          (1) To file, during any period in which offers or sales are being
       made, a post-effective amendment to this registration statement:

               (i) To include any prospectus required by Section 10(a)(3) of the
          Securities Act of 1933;

               (ii) To reflect in the prospectus any facts or events arising
          after the effective date of the registration statement (or the most
          recent post-effective amendment thereof) which, individually or in the
          aggregate, represent a fundamental change in the information set forth
          in the registration statement;

               (iii) To include any material information with respect to the
          plan of distribution not previously disclosed in the registration
          statement or any material change to such information in the
          registration statement;

          Provided, however, that paragraphs (1)(i) and (1)(ii) do not apply if
     the registration statement is on Form S-3 or Form S-8, and the information
     required to be included in the post-effective amendment by those paragraphs
     is contained in periodic reports filed by the registrant pursuant to


                                      II-3

<PAGE>

     Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are
     incorporated by reference in the registration statement.

          (2) That, for the purpose of determining any liability under the
     Securities Act of 1933, each post-effective amendment shall be deemed to be
     a new registration statement relating to the securities offered herein, and
     the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.

          (3) To remove from registration by means of a post-effective amendment
     any of the securities being registered which remain unsold at the
     termination of the offering.

     The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Securities Act
of 1933 and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless in
the opinion of counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act of 1933 and will be governed by the final adjudication of such issue.

     The undersigned registrant hereby undertakes to deliver or cause to be
delivered with the prospectus, to each person to whom the prospectus is sent or
given, the latest annual report to security holders that is incorporated by
reference in the prospectus and furnished pursuant to and meeting the
requirements of Rule 14a-3 or Rule 14c-3 under the Securities Exchange Act of
1934; and, where interim financial information required to be presented by
Article 3 of Regulation S-X is not set forth in the prospectus, to deliver, or
cause to be delivered to each person to whom the prospectus is sent or given,
the latest quarterly report that is specifically incorporated by reference in
the prospectus to provide such interim financial information.


                                      II-4

<PAGE>



                                   SIGNATURES

   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Berkeley, State of California, on May 7, 1999.
    

                                    XOMA LTD.


                                    By:  /s/ John L. Castello
                                         --------------------------------
                                         Name:   John L. Castello
                                         Title:  Chairman of the Board,
                                                 President and Chief
                                                 Executive Officer


                                      II-5

<PAGE>

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the dates indicated.
<TABLE>
<CAPTION>


                 Signature                                        Title                               Date
                 ---------                                        -----                               ----
   
<S>                                           <C>                                                   <C>
                                              Chairman of the Board, President and Chief            May 7, 1999
    
                                              Executive Officer (Principal Executive
/s/ John L. Castello                          Officer)
- -------------------------------
John L. Castello
   
                                              Chief Scientific and Medical Officer and              May 7, 1999
/s/ Patrick J. Scannon                        Director
- -------------------------------
Patrick J. Scannon

                                              Vice President, Finance and Chief Financial           May 7, 1999
    
                                              Officer (Principal Financial and Accounting
                                              Officer)
- -------------------------------
Peter B. Davis
   
                  *                           Director                                              May 7, 1999
- -------------------------------
    
James G. Andress
   
                  *                           Director                                              May 7, 1999
- -------------------------------
William K. Bowes, Jr.
                  *                           Director                                              May 7, 1999
    
- -------------------------------
Arthur Kornberg
   
                  *                           Director                                              May 7, 1999
    
- -------------------------------
Steven C. Mendell
   
                  *                           Director                                              May 7, 1999
    
- -------------------------------
W. Denman Van Ness


*By: --------------------------
      Attorney-in-fact

</TABLE>


                                      II-6
<PAGE>



                                  EXHIBIT INDEX

Exhibit
Number                                                                  Page
- ------                                                                  ----


3.1                   Memorandum of Continuance of XOMA Ltd (Exhibit
                      3.4) (1)

3.2                   Bye-Laws of XOMA Ltd. (Exhibit 3.5) (1)

4.1                   Stockholder  Rights Agreement dated as of
                      October 27,  1993 by and among XOMA  Corporation  and
                      First  Interstate  Bank of  California  as Rights Agent
                      (Exhibit 1) (2)

4.2                   Form  of  Resolution  Regarding  Preferences  and
                      Rights  of  Series  A Preference Shares
                      (Exhibit 4.2) (1)

4.3                   Form  of  Resolution  Regarding  Preferences  and
                      Rights  of  Series  B Preference Shares (Exhibit 4.3)
                      (1)

4.4                   Form  of  Resolution  Regarding  Preferences  and
                      Rights  of  Series  C Preference Shares (Exhibit 4.4)
                      (1)

4.5                   Form of Common Stock Purchase Warrant (1996
                      Warrants) (Exhibit 4.9) (3)

4.6                   Form of Common Stock Purchase Warrant (1997
                      Warrants) (Exhibit 3) (4)

4.7                   Form of Common Stock Purchase Warrant (1998
                      Warrants) (Exhibit 3) (5)

4.8                   Form of Common Stock Purchase Warrant (Incyte
                      Warrants) (Exhibit 2) (6)

4.9                   Form of Common Share Purchase Warrant (1999
                      Warrants) (Exhibit 5) (7)

5.1                   Opinion of Conyers Dill & Pearman*
                                                       -
10.1                  Form of  Subscription  Agreement,  dated as of
                      January 28, 1999,  by and between  XOMA and the
                      purchasers  of Common  Shares in the 1999 Private
                      Placement (Exhibit 2) (7)

10.2                  Form of Registration Rights Agreement, dated as of
                      January 28, 1998, by  and  between  XOMA  and the
                      purchasers  of  Common  Shares in  the 1999 Private
                      Placement (Exhibit 3) (7)


                                      

<PAGE>

10.3                  Form of Escrow Agreement, dated as of January 28, 1998, by
                      and between XOMA, Brian W. Pusch, as Escrow Agent and the
                      purchasers of Common Shares in the 1999 Private Placement
                      (Exhibit 4) (7)
   
23.1                  Consent of Ernst & Young LLP, Independent Auditors

23.2                  Consent of Arthur Andersen LLP, Independent Public 
                      Accountants

23.3                  Consent of Conyers Dill & Pearman (included in Exhibit 
                      5.1)

24.1                  Power of Attorney*
    


- --------------------


*      Previously filed


       (1) Incorporated by reference to the referenced exhibit to XOMA's
       Registration Statement on Form S-4 (File No. 333-68045).

(2)    Incorporated  by reference to the referenced  exhibit to XOMA
       Corporation's  Current Report on 8-K dated October 27, 1993 filed
       November 2, 1993 (File No. 0-14710).

(3)    Incorporated by referenced to the referenced exhibit to XOMA's
       Registration  Statement on Form S-3 filed June 28, 1998 (File
       No. 333-07263).

(4)    Incorporated by reference to the referenced exhibit to XOMA's Current
       Report on Form 8-K dated August 13,  1997 filed August
       18, 1997 (File No. 0-14710).

(5)    Incorporated  by reference to the referenced  exhibit to XOMA's  Current
       Report on Form 8-K dated June 28,  1998 filed June 29, 1998
       (File No. 0-14710).

(6)    Incorporated by reference to the referenced exhibit to XOMA's Current
       Report on Form 8-K dated July 9, 1998 filed July 16, 1998
       (File No. 0-14710).

(7)    Incorporated by reference to the referenced  exhibit to XOMA's Current
       Report on Form 8-K dated  January 28,  1999 filed January 29, 1999, as
       amended (File No. 0-14710).








                      
<PAGE>


   
                                                                    EXHIBIT 23.1
    


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS


   
         We consent to the reference to our firm under the caption "Experts" in
Amendment No. 1 to the Registration Statement (Form S-3) and related Prospectus
of XOMA Ltd. for the registration of 4,481,508 common shares and to the
incorporation by reference therein of our report dated February 12, 1999 with
respect to the 1998 consolidated financial statements of XOMA Ltd. included in
its Annual Report (Form 10-K) for the year ended December 31, 1998, filed with
the Securities and Exchange Commission.
    

                                                 /S/ ERNST & YOUNG LLP
                                                 ---------------------

   
Palo Alto, California
May 6,  1999
    

<PAGE>


                                                                    EXHIBIT 23.2




                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


         As independent public accountants, we hereby consent to the
incorporation by reference in this Registration Statement on Form S-3 of our
report dated February 3, 1998 included in XOMA LTD.'s Form 10-K for the year
ended December 31, 1998, and to all references to our firm included in this
Registration Statement.

                                                 ARTHUR ANDERSEN LLP


   
San Francisco, California
May 6, 1999
    



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