XOMA LTD
10-Q, 1999-05-17
PHARMACEUTICAL PREPARATIONS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q
                                   (mark one)
                   [X] Quarterly Report Pursuant to Section 13
                     or 15(d) of the Securities Exchange Act
                                     of 1934
                    For Quarterly Period Ended March 31, 1999

                                       or

              [ ] Transition Report Pursuant to Section 13 or 15(d)
                     of the Securities Exchange Act of 1934
                          For Transition Period from to

Commission File No. 0-14710

                                    XOMA Ltd.

             (Exact Name of Registrant as specified in its charter)

             Bermuda                                     94-2756657

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

   2910 Seventh Street, Berkeley, CA                           94710
(Address of principal executive offices)                     (Zip Code)

                                 (510) 644-1170
              (Registrant's telephone number, including area code)
                                 Not Applicable
(Former name, former address and former fiscal year, if changed since
 last report)

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrant
was required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days.

                                    Yes X     No  
                                       --       --

Indicate the number of shares outstanding of each of the issuer's classes of
common stock, as of the latest practicable date.

Common shares US$.0005 par value                       50,231,987              
- --------------------------------       ----------------------------------------
              Class                         Outstanding at March 31, 1999


<PAGE>


                                    XOMA Ltd.

                                TABLE OF CONTENTS


<TABLE>
<CAPTION>
<S>           <C>                                                                                              <C>
                                                                                                               Page
PART I        FINANCIAL INFORMATION

              Item 1       Financial Statements

                           Condensed Consolidated Balance Sheets as of
                           March 31, 1999 and December 31, 1998...................................................1

                           Condensed Consolidated Statements of Operations
                           for the Three Months Ended
                           March 31, 1999 and 1998................................................................2

                           Condensed Consolidated Statements of
                           Cash Flows for the Three Months Ended
                           March 31, 1999 and 1998................................................................3

                           Notes to Condensed Consolidated
                           Financial Statements ..................................................................4

              Item 2       Management's Discussion and Analysis
                           of Financial Condition and Results of
                           Operations ............................................................................6
<CAPTION>
PART II       OTHER INFORMATION
<S>           <C>                                                                                              <C>
              Items        1 through 5 are either inapplicable or nonexistent
                           and therefore are omitted from this report

              Item 6       Exhibits and Reports on Form 8-K..................................................... 10

Signatures.......................................................................................................12
</TABLE>


<PAGE>


                                    XOMA Ltd.

                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (In thousands)


                                                  March 31          December 31
                                                   1999                 1998
                                                (Unaudited)          (Audited)
Assets:
       Cash and cash equivalents                 $   16,315       $   11,857
       Short-term investments                        11,952           16,430
       Related party receivables                        246              246
       Other receivables                                 90              144
       Prepaid expenses and other                       303              159
                                                 ----------       ----------
              Total current assets                    28,906          28,836
                                                 -----------      -----------
                                             
       Property and equipment, net                    3,804            3,895
       Assets held for sale                           4,442            4,442
       Deposits and other                               131              131
                                                 ----------       ----------
                                             
                                                 $   37,283       $   37,304
                                                 ==========       ==========
                                             
                                             
Liabilities and Stockholders' Equity:        
       Accounts payable                          $    3,213       $   3,515
       Accrued liabilities                            8,520           6,740
       Capital lease obligations due         
         within one year                                181              286
                                                 ----------       ----------
       Total current liabilities                     11,914           10,541
       Convertible subordinated notes                26,911           26,513
                                                 ----------       ----------
              Total liabilities                      38,825           37,054
                                                 ----------       ----------
                                       
       Redeemable convertible
        preference shares                             3,600            6,440
                                                 ----------       ----------
Shareholders' equity (net capital
   deficiency)                                       (5,142)          (6,190)
                                                 ----------       ----------
                                                 $   37,283       $   37,304
                                                 ==========       ==========

The accompanying notes are an integral part of these financial statements.


                                       1
<PAGE>


                                    XOMA Ltd.

                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                 (Unaudited, in thousands except per share data)


                                             Three Months Ended
                                                  March 31
                                        1999                  1998
                                        ----                  ----
Revenues:                                             
     License fees                   $        17        $          25
     Product sales and royalties              3                   21
                                    -----------              -------
                                             20                   46
                                    -----------              -------
                                                      
Expenses:                                             
     Research and development            12,273                9,172
     General and administrative           1,380                1,442
                                    -----------              -------
                                         13,653               10,614
                                    -----------              -------
                                                      
Loss from operations                    (13,633)             (10,568)
                                                      
Other income (expense):                               
     Investment income                      369                  693
     Interest and other expense            (394)                (432)
                                    -----------               ------
Net loss                                (13,658)             (10,307)
                                                      
Preference share dividends                  (55)                (549)
                                    -----------               ------
Net loss available to common                          
 shareholders                       $   (13,713)       $     (10,856)
                                    ============       =============

Basic and Diluted Net Loss
  per Common Share                  $     (0.28)       $       (0.27)

Weighted Average Common
Shares Outstanding                       49,163               40,531



See accompanying notes to financial statements.


                                       2
<PAGE>


                                    XOMA Ltd.

                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                            (Unaudited, in thousands)

<TABLE>
<CAPTION>
                                                                                    Three Months Ended
                                                                                          March 31
                                                                                1999                1998
                                                                                ----                ----
<S>                                                                        <C>                        <C>      
CASH FLOWS FROM OPERATING ACTIVITIES:
     Net cash provided by (used in) operating activities                   $  (11,096)       $     (9,045)
                                                                           ----------        ------------

CASH FLOWS FROM INVESTING ACTIVITIES:
     Proceeds from sale of short-term investments                              18,854              95,969
     Payments for purchase of short-term investments                          (14,376)           (100,478)
     Capital expenditures                                                        (210)               (279)
                                                                           ----------        ------------

         Net cash provided by (used in) investing activities                    4,268              (4,788)
                                                                           ----------        ------------

CASH FLOWS FROM FINANCING ACTIVITIES:
     Proceeds from issuance of common shares, net                              11,391                  12
     Capital lease principal payments                                           (105)                (137)
                                                                           ---------         ------------

         Net cash provided by (used in) financing activities                  11,286                 (125)
                                                                           ---------         ------------

     Net increase (decrease) in cash and cash equivalents                      4,458              (13,958)
     Cash and cash equivalents at beginning of period                         11,857               37,225
                                                                           ---------         ------------

     Cash and cash equivalents at end of period                            $  16,315         $     23,267
                                                                           =========         ============
</TABLE>


See accompanying notes to financial statements.

                                       3
<PAGE>


                                    XOMA Ltd.

              NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                   (Unaudited)


1.   Basis of Presentation

     The interim information contained in this report is unaudited but, in
management's opinion, includes all normal recurring adjustments which are
necessary for a fair presentation of results for the periods presented. Interim
results do not necessarily indicate of results to be expected for the full year.
The financial statements should be read in conjunction with the Company's
audited financial statements for the year ended December 31, 1998.

2.   Supplemental Cash Flow Information

     In the first quarter of 1999, the Company contributed $0.4 million to the
Company's deferred savings and management incentive compensation programs by
issuing 118,516 common shares and paid dividends of $0.1 million on convertible
preference shares by issuing 29,618 common shares upon conversion.

     3. Accrued Liabilities

     Accrued liabilities consist of the following (in thousands):

                                                   ----------------------------
                                                    March 31,      December 31,
                                                    --------       -----------
                                                      1999             1998
                                                      ----             ----
    Accrued dividends                              $ 669            $    754
    Accrued payroll costs                           1,751              2,217
    Costs related to change in domicile                605             1,457
    Clinical trial costs                            4,481              1,746
    Other                                            1,014               566
                                                   -------          --------
                                                    $8,520            $6,740
                                                    ======            ======

     Activities through March 31, 1999 affecting the provision for change in
legal domicile established in 1998 are as follows (in millions):

 Original amount                                  $2.5
 Charges against the accrual                       1.9
 Adjustment to the accrual                          --


                                       4
<PAGE>


4.   Private Placement

     In February 1999, the Company issued 2,051,254 common shares to two
institutional investors for net proceeds of $11.4 million. The price represented
approximately a 60% premium over the current market price for XOMA shares. Under
certain circumstances the number of shares may be adjusted in the future. The
common shares will be held in an escrow account until sold by the investors (up
to a maximum of three years). Beginning August 31, 1999, the number of shares
remaining in the escrow account may be adjusted at 90-day intervals based on an
11% discount from a prevailing market price at that time. The investors also
received five-year warrants to purchase up to 240,000 common shares for $5.85
per share.

5.   Net Loss Per Common Share

     Basic and diluted net loss per common share is based on the weighted
average number of common shares outstanding during the period in accordance with
Financial Accounting Standard No. 128. Common share equivalents have not been
included because they are antidilutive.

6.   Subsequent Event

     In April 1999, the Company and Genentech, Inc. agreed to collaborative
development of the hu1124 (anti-CD11a) monoclonal antibody product through Phase
III, intended for the treatment of moderate to severe plaque psoriasis. Under
terms of the agreement, XOMA and Genentech will continue to collaborate on the
remaining clinical development and regulatory filings for the product in
psoriasis. XOMA will share future development costs, as well as future U.S.
profits, with Genentech on a 25%/75% basis. XOMA will receive a royalty on sales
outside the United States. Genentech will fund XOMA's share of development costs
via long-term convertible loans.

                                       5
<PAGE>



                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS


Results of Operations:

First quarter revenues were not significant in either 1999 or 1998.

Research & development expenses increased to $12.3 million in the first three
months of 1999, compared with $9.2 million in the 1998 period. The increase was
due primarily to spending on clinical trials and preparation of regulatory
filings for the Neuprex (R) and hu1124 products. General and administrative
spending was $1.4 million in the first three months of 1999 and 1998.

Investment income was lower in the first three months of 1999 compared to 1998
due to a lower average investment balance.


Liquidity and Capital Resources:

The Company's cash, cash equivalents and short-term investments totaled $28.3
million as of both March 31, 1999 and December 31, 1998. Net cash used in
operating activities plus lease payments and capital expenditures were offset by
the net proceeds from common shares issued in January 1999. Net cash used in
operating activities was $11.1 million in the first three months of 1999,
compared with $9.0 million in the 1998 period. The increase was primarily due to
payments for clinical trials and preparation of regulatory filings. The
Company's cash, cash equivalents and short-term investments are expected to
continue to decrease while the Company pursues U.S. Food and Drug Administration
licensure except to the extent the Company secures additional funding.


The Company has been able to control its operating cash consumption by carefully
monitoring its costs. As a result, its cash position and resulting investment
income are sufficient to finance the Company's currently anticipated levels of
spending through at least the end of 1999. The Company continues to evaluate a
variety of arrangements which would further strengthen its competitive position
and provide additional funding, but cannot predict when or whether any such
arrangement or additional funding will be secured. Without additional funding,
the Company would have to decrease or eliminate the development of some of its
products.

Year 2000 Exposure:

Year 2000 ("Y2K") exposure is the result of computer programs using two instead
of four digits to represent the year. These computer programs may erroneously
interpret dates beyond the year 1999, which could cause system failures or other
computer errors, leading to disruptions in operations.

The Company is developing a three-phase program to limit or eliminate Y2K
exposures. Phase I is to identify those systems, applications and third-party
relationships from which the Company has

                                       6
<PAGE>


exposure to Y2K disruptions in operations. Phase II is to develop and implement
action plans to achieve Y2K compliance in all areas before the end of 1999. Also
included in Phase II is the development of contingency plans to be implemented
should Y2K compliance not be achieved when required to avoid disruptions in
operations. Phase III is the final testing or equivalent certification of each
major area of exposure to ensure compliance. The Company believes it will
complete all phases before the end of 1999.

The Company has identified three major areas as critical for successful Y2K
compliance: Area 1, which includes company-wide information systems applications
that rely on computer software; Area 2, which includes manufacturing, quality,
and research applications that rely on computer programs embedded in
microprocessors; and Area 3, which includes third-party relationships which may
be affected by Area 1, 2 or 3 exposures that exist in other companies.

The Company, in accordance with Phase I of the program, is conducting an
internal review and contacting all software suppliers to determine major areas
of Y2K exposure in Area 1. In manufacturing, quality and research (Area 2), the
Company has engaged a consultant to help identify its exposures. With respect to
Area 3, the Company is evaluating its reliance on third parties for its
operations, and contacting these third parties in order to determine whether
their Y2K compliance will adequately assure the Company's uninterrupted
operations.

Although the Company has yet to complete Phase I of its Y2K program with respect
to all three of the major areas, the Company believes that it relies 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 its operations. Because
the Company has not completed Phase II contingency planning, it can not describe
what action it would take should Y2K compliance not be achievable in time.

As of March 31, 1999, the Company has identified costs of approximately $0.6
million to replace or remediate and test its Area 1 computer information systems
and its Area 2 manufacturing, quality and research applications, of which $0.3
million has been expended. Not having completed its Phase I and II evaluations
of all three areas, the Company can not at this time estimate the total
potential cost of its Y2K compliance programs. The funds for these costs will be
part of the Company's cash flow from operations and capital expenditures.

Assuming that the Company's efforts to mitigate its 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 the Company's
manufacturing and research operations.

Quantitative and Qualitative Disclosures About Market Risk:

Interest Rate Risk. The Company's exposure to market rate risk for changes in
interest rates relates primarily to the Company's investment portfolio. The
Company does not use derivative financial instruments in its investment
portfolio. By policy, the Company places its investments with high quality debt
security issuers, limits the amount of credit exposure to any one issuer, limits
duration by restricting the term, and holds investments to maturity except under
rare circumstances. The Company classifies its cash equivalents or short-term
investments as fixed rate if the rate of return on an instrument remains fixed

                                       7
<PAGE>


over its term. As of March 31, 1999, all the Company's cash equivalents and
short-term investments are classified as fixed rate.

The Company also has a long-term convertible note due to Genentech in 2005.
Interest on this note of LIBOR plus 1% is reset at the end of June and December
each year and therefore variable.

The table below presents the amounts and related weighted interest rates of the
Company's cash equivalents, short-term investments and long-term convertible
note at March 31, 1999:

<TABLE>
<CAPTION>
                                                                        Fair Value               Average
                                                       Maturity       (in $ millions)        Interest Rate
                                                                     ------------------     ---------------
<S>                                                 <C>              <C>                     <C> 
 Cash equivalents, fixed rate                          daily                16.3                   5.2%
 Short-term investments, fixed rate                 0 - 1 year              12.0                   4.9%
 Long-term convertible note, variable rate             2005                 26.9                   6.0%

</TABLE>

Other Market Risk. At March 31, 1999 the Company had Series C Preference Shares
and a long-term convertible note outstanding , both of which are convertible
into common shares based on the market price of the Company's common shares at
the time of conversion. A 10% decrease in the market price of the Company's
common shares would increase the number of shares issuable upon conversion of
either security by approximately 11%. An increase in the market price of Company
common shares of 10% would decrease the shares issuable by approximately 9%.

                                       8

<PAGE>


Forward Looking Statements:

Certain statements contained herein that are not related to historical facts may
constitute "forward looking" information, as that term is defined in the Private
Securities Litigation Reform Act of 1995. Such statements are based on the
Company's current beliefs as to the outcome and timing of future events, and
actual results may differ materially from those projected or implied in the
forward looking statements. Further, certain forward looking statements are
based upon assumptions of future events which may not prove to be accurate. The
forward looking statements involve risks and uncertainties including, but not
limited to, risks and uncertainties related to regulatory approvals, product
efficacy and development, the Company's financing needs and opportunities,
scale-up and marketing capabilities, intellectual property protection,
competition, stock price volatility and other risk factors referred to herein
and in other of the Company's Securities and Exchange Commission filings.

                                       9

<PAGE>


PART II - OTHER INFORMATION


Item 1  Legal Proceedings.  None.

Item 2  Changes in Securities.  None.

Item 3  Defaults Upon Senior Securities.  None.

Item 4  Submission of Matters to a Vote of Security Holders. None.

Item 5  Other Information.  None.

Item 6  Exhibits and Reports on Form 8-K.

(a)     Exhibit 10.1    Form of Subscription Agreement dated as of January 28,
                        1999 by and between XOMA Ltd. and the purchasers of
                        Common Shares in the 1999 Private Placement (Exhibit
                        2).(1)

        Exhibit 10.2    Form of Registration Rights Agreement dated as of
                        January 28, 1999 by and between XOMA Ltd. and the
                        purchasers of Common Shares in the 1999 Private
                        Placement (Exhibit 3).(1)

        Exhibit 10.3    Form of Escrow Agreement dated as of January 28, 1999
                        by and between XOMA Ltd., Brian W. Pusch as Escrow
                        Agent and the purchasers of Common Shares in the 1999
                        Private Placement (Exhibit 4).(1)

        Exhibit 10.4    Form of Common Share Purchase Warrant (Exhibit 5).(1)

        Exhibit 10.5    Amendment to Collaboration Agreement, dated as of April
                        14, 1999, between XOMA Ltd. and Genentech, Inc. (with
                        certain confidential information omitted, which omitted
                        information is the subject of a confidential treatment
                        request and has been filed separately with the
                        Securities and Exchange Commission).

        Exhibit 10.6    Amendment to Common Stock and Convertible Note Purchase
                        Agreement, dated as of April 14, 1999, between XOMA Ltd.
                        and Genentech, Inc.

        Exhibit 10.7    Second Amendment to Convertible Subordinated Note
                        Agreement,

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

(1)  Incorporated by reference to the referenced exhibit to the Company's
     Current Report on Form 8-K dated January 28, 1999 filed January 29, 1999,
     as amended by Amendment No. 1 thereto on Form 8-K/A dated and filed 
     February 18, 1999 (File No. 0-014710)

                                       10
<PAGE>


                        dated as of April 14, 1999, between XOMA Ltd. and
                        Genentech, Inc. (with certain confidential information
                        omitted, which omitted information is the subject of a
                        confidential treatment request and has been filed
                        separately with the Securities and Exchange Commission).

         Exhibit 27.1   Financial Data Schedule

(b)      Current Report on Form 8-K dated January 28, 1999 filed January 29,
         1999, as amended by Amendment No. 1 thereto on Form 8-K/A dated
         February 18, 1999 (File No. 0-14710), Items 5 (Other Events) and 7
         (Exhibits).

         Current Report on Form 8-K dated January 5, 1999 filed January 6, 1999
         (File No. 0-14710), Item 5 (Other Events) and 7 (Exhibits).

                                       11

<PAGE>


                                    XOMA Ltd.




                                   SIGNATURES
                                   ----------




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



                                XOMA LTD.



Date:  May 17, 1999             By:  /s/ JOHN L. CASTELLO               
                                     ------------------------------------
                                     John L. Castello
                                     Chairman of the Board, President and
                                     Chief Executive Officer

                                       12

Date:  May 17, 1999             By:  /s/ PETER B. DAVIS                        
                                     -------------------------------------
                                     Peter B. Davis
                                     Vice President, Finance and
                                     Chief Financial Officer

                                       12

EXHIBIT 10.5

[*] indicates that a confidential portion of the text of this agreement has been
omitted and filed separately with the Securities and Exchange Commission

                                    AMENDMENT
                                       TO
                             COLLABORATION AGREEMENT

                                 April 14, 1999


                  This Amendment is made and entered into as of the date first
written above by and between Genentech, Inc., a Delaware corporation having its
principal executive office at 1 DNA Way, South San Francisco, California 94080
("Genentech"), and XOMA Ltd., a Bermuda company having its principal office at
2910 Seventh Street, Berkeley, California 94710 ("XOMA"), to amend that certain
Collaboration Agreement, dated as of April 22, 1996 (the "Collaboration
Agreement"), by and between Genentech and XOMA.

                  Genentech and XOMA agree to amend the Collaboration Agreement
as follows:

                  1. To delete the fourth sentence of Section 5.1(b) in its
entirely.

                  2. To delete from the last paragraph of Section 5.1(b) the
words "within thirty (30) days after the successful completion of a Phase II
Clinical Trial for one of the Initial Indications" and replace them with the
words "by April 15, 1999".

                  3. To insert into the second sentence of Section 7.2 an open
parenthesis after the words "set forth in Section 5.1(a)" and before the words
"or Genentech selects", and a closed parenthesis followed by "or 5.1(b)" after
the words "under Section 5.2(c)(2)" and before the comma and the words
"Genentech will loan", and to add to the end of the sentence the clause
"provided that the amount so loaned to XOMA pursuant to this sentence shall not
exceed $[*] million in the aggregate without the prior approval of Genentech's
Board of Directors, which approval Genentech management will seek in good faith
upon the request of the Project Core Team", such that the sentence reads in its
entirety as follows:

                  "In addition, if XOMA selects the option set forth in Section
                  5.1(a) (or Genentech selects such option for XOMA under
                  Section 5.2(c)(2)) or 5.1(b), Genentech will loan XOMA the
                  amount necessary to fund its development obligations under the
                  Development Plan based on the annual budget in a similar
                  fashion each year until the receipt of Regulatory Approval
                  (unless Genentech earlier terminates this Agreement) under the
                  terms and conditions of the Note Purchase Agreement, provided
                  that the amount so loaned to XOMA pursuant to this sentence
                  shall not exceed $[*] million in the aggregate without the
                  prior approval of Genentech's Board of Directors, which
                  approval Genentech management will seek in good faith upon the
                  request of the Project Core Team."

                  4. To replace the notice provisions with respect to Genentech
and XOMA in Section 18.8 in their entirety with the following:


<PAGE>

                                       -2-


                           "If to Genentech, addressed to:

                                    Genentech, Inc.
                                    1 DNA Way
                                    South San Francisco, CA 94080-4990
                                    Attention:  Corporate Secretary
                                    Telephone:   (650) 225-1000
                                    Facsimile:  (650) 952-9881

                           If to XOMA, addressed to:

                                    XOMA Ltd.
                                    2910 Seventh Street
                                    Berkeley, CA 94710
                                    Attention: Corporate Secretary
                                    Telephone:  (510) 644-1170
                                    Telecopy:  (510) 649-7571
                                    With a copy to: C.L. Dellio"

                  5. To replace all references to "XOMA Corporation" with
references to "XOMA Ltd.", which is a Bermuda company that is the successor in
interest to XOMA Corporation, a Delaware company.

                  6. To replace all references to "Series E Preferred Stock"
with references to "Series B Preference Shares."

                  7. To replace all references to "Common Stock" with references
to "Common Shares."

                  All other terms and conditions of the Agreement shall remain
unchanged by this Amendment.

                  This Collaboration Agreement may be executed in two
counterparts, each of which will be deemed an original, but both of which
together will constitute one and the same instrument.

                            [signature page follows]


<PAGE>

                                       -3-


                  IN WITNESS WHEREOF, this Collaboration Agreement has been
executed and delivered on the date first written above by duly authorized
representatives of the parties hereto.


GENENTECH INC.                               XOMA LTD.
By: /s/ Louis J. Lavigne, Jr.                By: /s/ Christopher J. Margolin
    ----------------------------             -------------------------------
    Name:   Louis J. Lavigne, Jr.               Name:   Christopher J. Margolin
    Title:  Executive Vice President and        Title:  Vice President,
            Chief Financial Officer                     General Counsel
                                                        and Secretary


EXHIBIT 10.6


                                    AMENDMENT
                                       TO
              COMMON STOCK AND CONVERTIBLE NOTE PURCHASE AGREEMENT

                                 April 14, 1999


                  This Amendment is made and entered into as of the date first
written above by and between Genentech, Inc., a Delaware corporation having its
principal executive office at 1 DNA Way, South San Francisco, California 94080
("Genentech"), and XOMA Ltd., a Bermuda company having its principal office at
2910 Seventh Street, Berkeley, California 94710 ("XOMA"), to amend that certain
Common Stock and Convertible Note Purchase Agreement, dated as of April 22, 1996
(the "Purchase Agreement"), by and between Genentech and XOMA.

                  Genentech and XOMA agree to amend the Purchase Agreement as
follows:

                  1.     To replace the words "State of Delaware" in Section
4(a) with the words "Commonwealth of Bermuda."

                  2.     To insert the words "and each amendment thereto" after
the words "this Agreement, the Collaboration Agreement and the Convertible Note"
in the first and second sentences of Section 4(b).

                  3.     To delete the words "federal and state" from the first
and second sentences of Section 4(c) and to replace them with the words "Bermuda
Companies Act and Bermuda", and to delete the words "after giving effect to the
filing of the Certificate of Designation with the Secretary of State of the
State of Delaware as contemplated by Section 8" from the third sentence of
Section 4(c).

                  4.     To insert the words "and each amendment thereto" after
the words "this Agreement, the Collaboration Agreement and the Convertible Note"
in Section 4(d), and to delete clause (i) from Section 4(d) and renumber clauses
(ii), (iii) and (iv) as (i), (ii) and (iii).

                  5.     To delete the words "the SEC Reports (as defined in
Section 4(j) below)" in Section 4(e) and replace them with the words "the
Company's most recent report filed with the Securities and Exchange Commission
pursuant to the Exchange Act (as defined below) that calls for such disclosure".

                  6.     In Section 4(h), (i) to delete the words "SEC Reports
and except for the issuance of the Company's Non-Voting Cumulative Convertible
Preferred Stock, Series D," and to replace them with the words "the Company's
most recent report filed with the Securities and Exchange Commission pursuant to
the Exchange Act (as defined below) that calls for such disclosure"; (ii) to
delete the words "the SEC Reports" and replace them with the words "such
report"; and (iii) to delete the word "hereof" and replace it with the word
"thereof."

                  7.     To delete the words "Amended and Restated Certificate
of Incorporation or Bylaws" in Section 4(i) and replace them with the words
"Memorandum of Continuance or Bye-Laws", and to insert at the end of Section
4(i) the words "together with each amendment thereto".

<PAGE>

                                      -2-

                  8.     To add the following sentence to the end of Section
6(d):

                         "Any stop-transfer instructions with respect to the
                         Securities shall be removed by the Company promptly
                         upon the request of the Holder if the Holder shall have
                         obtained an opinion of counsel in form and in substance
                         satisfactory to the Company to the effect that such
                         instructions are no longer required."

                  9.     To delete the words "upon any such assignment, sale or
transfer of such shares" from the last sentence of Section 7(a) and replace them
with the words "as set forth therein."

                  10.    To add the following as new Sections 8(c) and 8(d):

                         "(c) The Company shall use its commercially reasonable
                         efforts to remain qualified to use Form S-3 under the
                         Securities Act or another appropriate form (including
                         but not limited to Form A or Form B proposed by the
                         staff of the Securities and Exchange Commission in
                         Securities Act Release No. 33-7606, if adopted)
                         permitting registration of the Conversion Shares and
                         any Registrable Securities issued in respect of such
                         Conversion Shares for resale by the Holder in the
                         manner or manners reasonably designated by the Holder.

                         (d) The Company shall not issue any Series B Preference
                         Shares to any other party without the prior written
                         consent of the Holder."

                  11.    To insert the words "as amended" into Section 9(a)(i)
after the words "Convertible Note."

                  12.    To insert the words "and each amendment thereto" after
the words the "Collaboration Agreement and the Convertible Note" in Section
9(a)(v) and after the words "this Agreement, the Collaboration Agreement and the
Convertible Note" in Section 9(a)(vi).

                  13.    To insert the words "and each subsequent loan as of
their respective Closing Dates" into Section 9(a)(viii) after the words "Initial
Loan."

                  14.    To add a new Section 10(b)(iii) that reads in full as
follows:

                              "(iii) The Company agrees to file with the
                         Commission,promptly following the execution of the
                         Amendment to this Agreement, but in no event later than
                         45 days thereafter, a Shelf Registration Statement
                         covering not less than that number of Conversion Shares
                         that would be issued upon the conversion of the
                         Preferred Stock that would be issued if $2 million of
                         the principal amount of the Convertible Note were to be
                         converted into Preferred Stock as of the filing date.
                         Such Shelf Registration Statement shall be on Form S-3
                         under the Securities Act or another appropriate form
                         (including but not limited to Form A or Form B proposed
                         by the staff of the Securities and Exchange Commission
                         in Securities Act Release No. 33-7606, if adopted)
                         permitting registration of such Conversion Shares and
                         any Regis-


<PAGE>
                                      -3-


                         trable Securities issued in respect of such Conversion
                         Shares for resale by the Holder in the manner or
                         manners reasonably designated by the Holder. The
                         Company shall use its commercially reasonable efforts
                         to cause such Shelf Registration Statement to be
                         declared effective pursuant to the Securities Act as
                         promptly as practicable following the filing thereof
                         and to keep continuously effective under the Securities
                         Act until termination of such obligation pursuant to
                         Section 10(f)(iii).

                  15.    To add a new Section 10(b)(iv) that reads in full as
follows:

                              "(iv) At such time (if any) that, as a result of
                         the Purchaser's sales of Conversion Shares covered by
                         the Shelf Registration Statement referred to in Section
                         10(b)(iii), such Shelf Registration Statement is
                         available to cover sales of a maximum number of
                         Conversion Shares then issued or issuable upon
                         conversion of Preferred Stock issued or issuable upon
                         conversion of $1 million of the principal amount of the
                         Convertible Note or less, then the Company shall
                         promptly file an amendment or supplement to such
                         Registration Statement, such that such Registration
                         Statement will be available for sales of Conversion
                         Shares then issued or issuable upon conversion of
                         Preferred Stock issued or issuable upon conversion of
                         not less than $2 mi1lion of the principal amount of the
                         Convertible Note. The Company shall use its
                         commercially reasonable efforts to cause such
                         amendments or supplements to such Shelf Registration
                         Statement to be declared effective pursuant to the
                         Securities Act as promptly as practicable following the
                         filing thereof and to keep the same continuously
                         effective under the Securities Act until termination of
                         such obligation pursuant to Section 10(f)(iii)."

                  To add a new Section 10(f)(iii) that reads in full as follows:

                                "(iii) The registration obligations of the
                           Company pursuant to Sections 10(b) through (d) of
                           this Agreement shall terminate with respect to the
                           Shelf Registration Statement contemplated by Section
                           10(b)(iii) and any amendments or supplements thereto
                           contemplated by Section 10(b)(iv) at the time at
                           which (A) the Purchaser has no obligation to make
                           additional loans to the Company under the Convertible
                           Note, and (B) all of the Conversion Shares that could
                           be issued upon the conversion of the Preferred Stock
                           that could be issued if the entire principal amount
                           of the Initial Loan and each Tranche may be sold
                           within a given three-month period without compliance
                           with the registration requirements of the Securities
                           Act pursuant to Rule 144 or other applicable
                           exemption supported by a written opinion of legal
                           counsel for the Company which shall be reasonably
                           satisfactory in form and substance to legal counsel
                           for the Holder."

<PAGE>
                                      -4-

                  17.    To replace the notice provisions in Section 11(a) and
(b) in their entirety with the following:

                           "(a)     If to the Purchaser, to:

                                    Genentech, Inc.
                                    1 DNA Way
                                    South San Francisco, CA  94080-4990
                                    Telephone:  (650) 225-1000
                                    Facsimile:  (650) 952-9881

                                    Attention:  Corporate Secretary

                           (b)      If to the Company, to:

                                    XOMA Ltd
                                    2910 Seventh Street
                                    Berkeley, CA  94710
                                    Telephone:  (510) 664-1170
                                    Facsimile:  (510) 649-7571

                                    Attention:  Corporate Secretary"

                  18.    To replace all references to "XOMA Corporation" with
references to "XOMA Ltd.", which is a Bermuda company that is the successor in
interest to XOMA Corporation, a Delaware company.

                  19.    To replace all references to "Series E Preferred Stock"
and "Preferred Stock" with references to "Series B Preference Shares."

                  20.    To replace all references to "Common Stock" with
references to "Common Shares."

                  All other terms and conditions of the Agreement shall remain
unchanged by this Amendment. The parties have agreed that this Amendment will be
governed by and construed in accordance with the laws of the State of Delaware.

                  This Purchase Agreement may be executed in two counterparts,
each of which will be deemed an original, but both of which together will
constitute one and the same instrument.

                            [signature page follows]


<PAGE>


                  IN WITNESS WHEREOF, this Purchase Agreement has been executed
and delivered on the date first written above by duly authorized representatives
of the parties hereto.


GENENTECH, INC.                              XOMA LTD.
By: /s/ Louis J. Lavigne, Jr                 By: /s/ Christopher J. Margolin
    -----------------------------------      -------------------------------
    Name:   Louis J. Lavigne, Jr.                Name:   Christopher J. Margolin
    Title:  Executive Vice President and         Title:  Vice President, 
            Chief Financial Officer                      General Counsel and 
                                                         Secretary



[*] indicates that a confidential portion of the text of this agreement has been
omitted and filed separately with the Securities and Exchange Commission

                                SECOND AMENDMENT
                                       TO
                     CONVERTIBLE SUBORDINATED NOTE AGREEMENT

                                 April 14, 1999

                  This amendment (this "Second Amendment") is made and entered
into as of the date first written above by and between Genentech, Inc., a
Delaware corporation having its principal executive office at 1 DNA Way, South
San Francisco, California 94080 ("Genentech"), and XOMA Ltd., a Bermuda company
having its principal office at 2910 Seventh Street, Berkeley, California 94710
("XOMA"), to amend that certain Convertible Subordinated Note Agreement, dated
as of April 22, 1996 (the "Note Agreement"), by and between Genentech and XOMA,
as amended by that certain amendment, dated June 13, 1996 (the "First
Amendment"), to the Note Agreement.

                  Genentech and XOMA agree to amend the Note Agreement as
follows:

                  1.     To replace Schedule A attached thereto with Schedule A
attached hereto.

                  2.     To add the following sentence to the end of Section 
1(c):

                         "In addition, as a condition to the Lender's obligation
                         to extend to the Company the first additional loan
                         after April 14, 1999 pursuant to Section 7.2 of the
                         Collaboration Agreement, the Lender shall have received
                         an opinion dated as of the Closing Date of such loan,
                         in form and substance reasonably satisfactory to the
                         Lender, from Conyers Dill & Pearman, Bermuda counsel to
                         the Company, covering the topics covered in paragraphs
                         1 (with reference to Bermuda law and the business of
                         the Company as described in its most recent Annual
                         Report on Form 10-K), 2 (other than the provisions
                         thereof relating to enforceability), 3 (with reference
                         to the current capitalization of the Company), 5, 6, 7
                         (with reference to Bermuda law) and 8 (with reference
                         to Bermuda law) of the previously delivered opinion of
                         Cahill Gordon & Reindel dated April 22, 1996.

                         3.   To delete Section 1(h), which was added by the 
First Amendment, and replace it with a new Section 1(h) that reads in full as
follows:

                              "(h) Conversion of Excess Borrowings. In the event
                         that the Lender's Ownership Interest on any particular
                         date exceeds the Threshold Percentage of the Company's
                         Market Capitalization on such date, an amount of the
                         Company's borrowings (together with accrued and unpaid
                         interest) under this Note equal to such excess (any
                         such amount is referred to herein as "Excess
                         Borrowings") shall, at the option of the Lender, be
                         converted into Series B Preference Shares pursuant to
                         the conversion procedures and other

<PAGE>

                                      -2-

                         provisions of Section 4 hereof, such option to be
                         exercisable by prior written notice to the Company
                         delivered not more than 15 trading days after such
                         date. The following terms as used in this Note shall
                         have the following meanings:

                              "Ownership Interest" means, on a particular date,
                         the sum of the principal amount of the Company's
                         borrowings outstanding under this Note, plus all
                         accrued and unpaid interest, plus the aggregate Market
                         Value of that number, up to 50,000 shares, of Common
                         Shares of the Company owned by the Lender on such date.

                                    "Threshold Percentage" means [*] percent
                           ([*] %), or such lower percentage as may be required
                           in order for the Lender to comply with the test for
                           loan impairment under U.S. generally accepted
                           accounting principles (as applied by the Lender) as
                           in effect from time to time.

                                    "Market Capitalization" means on a
                           particular date, the sum of (i) the product of (A)
                           the per share Market Value of the Company's voting
                           Common Shares multiplied by (B) the sum of (1) the
                           number (to be provided by the Company upon request of
                           the Lender) of the Company's voting Common Shares
                           then outstanding plus (2) the number (to be provided
                           by the Company upon the request of the Lender) of
                           voting Common Shares issuable upon the exercise of
                           outstanding options issued by the Company for the
                           purchase thereof to the extent that the exercise
                           price thereof is at or below the per share Market
                           Value of the Common Shares on such date plus (3) the
                           number (to be provided by the Company upon the
                           request of the Lender) of voting Common Shares
                           issuable upon conversion on such date of any
                           outstanding Series B Preference Shares, Series C
                           Preference Shares and other Convertible Securities,
                           plus (ii) the entire principal amount of the
                           Company's borrowings outstanding under this Note,
                           together with all accrued and unpaid interest. For
                           purposes of this definition, no security of the
                           Company will be counted more than once.

                                    "Market Value" means, on a particular date,
                           with respect to the Company's Common Shares, the
                           average of the closing sale prices for the Company's
                           Common Shares on the principal exchange or market on
                           which such shares are registered, listed or admitted
                           for trading, as reported in The Wall Street Journal
                           (Western Edition), for the immediately preceding
                           fifteen (15) trading days.

                                    "Convertible Securities" means any other
                           securities of the Company that are, by their terms as
                           in effect on such date, directly or indirectly
                           convertible into voting Common Shares of the Company;
                           provided that the per share conversion price of such
                           securities is at or below the current Market Value of
                           the Common Shares into which such securities are
                           convertible on such date."

<PAGE>

                                      -3-

                  4.     To reverse the amendment to Section 3(d) made by the 
First Amendment, and return to the original language of the Note Agreement.

                  5.     To reverse the amendment to Section 4(a) made by the
First Amendment, and to return to the original language of the Note Agreement as
amended by this Second Amendment.

                  6.     To insert, after clause (iii) of the first sentence of
Section 4(a) (but before the defined term at the end thereof), a new clause (iv)
that reads in full as follows:

                         "(iv) with respect to any Excess Borrowings, as
                         determined pursuant to Section 1(h) of this Note (but
                         only with respect to such Excess Borrowings), upon
                         receipt by the Company of the notice provided for in
                         Section 1(h)."

                  7.     To insert into the third sentence (after giving effect
to this Second Amendment) of Section 4(a) the words "or any Excess Borrowings"
and a comma after each of the three occurrences of the words "or the applicable
Tranche," and before each of the three occurrences of the words "as the case may
be", such that the sentence reads as follows:

                         "The number of Series B Preference Shares into which
                         this Note or the applicable Tranche, or any Excess
                         Borrowing, as the case may be, shall be converted (the
                         "Conversion Shares") shall be determined by dividing
                         the sum of the aggregate unpaid principal amount of
                         this Note or the applicable Tranche, or any Excess
                         Borrowings, as the case may be, and the unpaid accrued
                         interest on this Note or the applicable Tranche, or any
                         Excess Borrowings, as the case may be, by the
                         Conversion Price (as defined below) and rounding the
                         result to the nearest whole integer."

                  8.     To add two new sentences to the end of Section 4(a) 
that read in full as follows:

                         "The conversion of any Excess Borrowings hereunder
                         shall first be applied against the most recently
                         extended Tranche, and then against each preceding
                         Tranche through to Tranche A. Each such conversion and
                         the reduction in the amounts of each Tranche shall be
                         recorded on Schedule B attached hereto at the time of
                         such conversion."

                  9.     To insert the parenthetical words "(or any portion
thereof)" immediately after each of the three occurrences of the word "Tranche"
in Section 4(b).

                  10.    To replace the notice provisions with respect to 
Genentech and XOMA in Section 7(a) in their entirety with the following:

                           "If to the Lender, to:

                                    Genentech, Inc.
                                    1 DNA Way
                                    South San Francisco, CA  94080-4990
                                    Telephone:  (650) 225-1000
                                    Facsimile:  (650) 952-9881


<PAGE>

                                      -4-

                                    Attention:  Corporate Secretary

                           If to the Company, addressed to:

                                    XOMA Ltd.
                                    2910 7th Street
                                    Berkeley, CA  94710
                                    Telephone:  (510) 644-1170
                                    Facsimile:  (510) 649-7571

                                    Attention:  Corporate Secretary"

                  11.    To replace all references to "XOMA Corporation" with
references to "XOMA Ltd.", which is a Bermuda company that is the successor in
interest to XOMA Corporation, a Delaware company.

                  12.    To replace all references to "Series E Preferred Stock"
with references to "Series B Preference Shares."

                  13. To replace all references to "Common Stock" with
references to "Common Shares."

                  All other terms and conditions of the Note Agreement and the
First Amendment shall remain unchanged by this Second Amendment. The parties
have agreed that this Second Amendment will be governed by and construed in
accordance with the laws of the State of Delaware.

                  This Note Agreement may be executed in two counterparts, each
of which will be deemed an original, but both of which together will constitute
one and the same instrument.

                            [signature page follows]


<PAGE>

                  IN WITNESS WHEREOF, this Note Agreement has been executed and
delivered on the date first written above by duly authorized representatives of
the parties hereto.

GENENTECH INC.                              XOMA LTD.
By: /s/ Louis J. Lavigne, Jr.               By:  /s/ Christopher J. Margolin
    --------------------------                   ---------------------------
    Name:   Louis J. Lavigne, Jr.                Name:   Christopher J. Margolin
    Title:  Executive Vice President and         Title:  Vice President,
            Chief Financial Officer                      General Counsel and
                                                         Secretary


<TABLE> <S> <C>


<ARTICLE>                     5
<CIK>                         0001074404
<NAME>                        Xoma Limited
<MULTIPLIER>                                    1,000
       
<S>                                         <C>
<PERIOD-TYPE>                                3-MOS
<FISCAL-YEAR-END>                              DEC-31-1998
<PERIOD-END>                                   MAR-31-1999
<CASH>                                          16,315
<SECURITIES>                                    11,952
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                28,906
<PP&E>                                          31,336
<DEPRECIATION>                                  27,532
<TOTAL-ASSETS>                                  37,283
<CURRENT-LIABILITIES>                           11,914
<BONDS>                                              0
                                0
                                          0
<COMMON>                                            25
<OTHER-SE>                                      (5,167)
<TOTAL-LIABILITY-AND-EQUITY>                    37,283
<SALES>                                              0
<TOTAL-REVENUES>                                    20
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                13,653
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 404
<INCOME-PRETAX>                                (13,658)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (13,658)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (13,658)
<EPS-PRIMARY>                                    (0.28)
<EPS-DILUTED>                                    (0.28)
        


</TABLE>


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