PROSPECTUS FILED PURSUANT TO RULE 424(B)(3)

                       LIGAND PHARMACEUTICALS INCORPORATED

                                                FILED PURSUANT TO RULE 424(B)(3)
                                                     REGISTRATION NO. 333-131029

                          PROSPECTUS SUPPLEMENT NO. 27
    (TO PROSPECTUS DATED APRIL 12, 2006, AS SUPPLEMENTED AND AMENDED BY THAT
PROSPECTUS SUPPLEMENT NO. 1 DATED MAY 15, 2006, THAT PROSPECTUS SUPPLEMENT NO. 2
DATED JUNE 12, 2006, THAT PROSPECTUS SUPPLEMENT NO. 3 DATED JUNE 29, 2006, THAT
PROSPECTUS SUPPLEMENT NO.4 DATED AUGUST 4, 2006, THAT PROSPECTUS SUPPLEMENT NO.5
 DATED AUGUST 9, 2006, THAT PROSPECTUS SUPPLEMENT NO. 6 DATED AUGUST 30, 2006,
   THAT PROSPECTUS SUPPLEMENT NO. 7 DATED SEPTEMBER 11, 2006, THAT PROSPECTUS
  SUPPLEMENT NO. 8 DATED SEPTEMBER 12, 2006, THAT PROSPECTUS SUPPLEMENT NO. 9
DATED OCTOBER 2, 2006, THAT PROSPECTUS SUPPLEMENT NO. 10 DATED OCTOBER 17, 2006,
   THAT PROSPECTUS SUPPLEMENT NO. 11 DATED OCTOBER 20, 2006, THAT PROSPECTUS
  SUPPLEMENT NO. 12 DATED OCTOBER 31, 2006, THAT PROSPECTUS SUPPLEMENT NO. 13
 DATED NOVEMBER 14, 2006, THAT PROSPECTUS SUPPLEMENT NO. 14 DATED NOVEMBER 15,
2006, THAT PROSPECTUS SUPPLEMENT NO. 15 DATED DECEMBER 14, 2006, THAT PROSPECTUS
SUPPLEMENT NO. 16 DATED JANUARY 5, 2007, THAT PROSPECTUS SUPPLEMENT NO. 17 DATED
JANUARY 16, 2007, THAT PROSPECTUS SUPPLEMENT NO. 18 DATED FEBRUARY 5, 2007, THAT
     PROSPECTUS SUPPLEMENT NO. 19 DATED FEBRUARY 28, 2007, THAT PROSPECTUS
 SUPPLEMENT NO. 20 DATED MARCH 5, 2007, THAT PROSPECTUS SUPPLEMENT NO. 21 DATED
  MARCH 15, 2007, THAT PROSPECTUS SUPPLEMENT NO. 22 DATED MARCH 16, 2007, THAT
 PROSPECTUS SUPPLEMENT NO. 23 DATED MARCH 20, 2007, THAT PROSPECTUS SUPPLEMENT
 NO. 24 DATED MARCH 23, 2007, THAT PROSPECTUS SUPPLEMENT NO. 25 DATED MARCH 29,
        2007, AND THAT PROSPECTUS SUPPLEMENT NO. 26 DATED APRIL 2, 2007)

         This Prospectus Supplement No. 27 supplements and amends the prospectus
dated April 12, 2006 (as supplemented and amended by that Prospectus Supplement
No. 1 dated May 15, 2006, that Prospectus Supplement No. 2 dated June 12, 2006,
that Prospectus Supplement No. 3 dated June 29, 2006, that Prospectus Supplement
No. 4 dated August 4, 2006, that Prospectus Supplement No. 5 dated August 9,
2006, that Prospectus Supplement No. 6 dated August 30, 2006, that Prospectus
Supplement No. 7 dated September 11, 2006, that Prospectus Supplement No. 8
dated September 12, 2006, that Prospectus Supplement No. 9 dated October 2,
2006, that Prospectus Supplement No. 10 dated October 17, 2006, that Prospectus
Supplement No. 11 dated October 20, 2006, that Prospectus Supplement No. 12
dated October 31, 2006, that Prospectus Supplement No. 13 dated November 14,
2006, that Prospectus Supplement No. 14 dated November 15, 2006, that Prospectus
Supplement No. 15 dated December 14, 2006, that Prospectus Supplement No. 16
dated January 5, 2007, that Prospectus Supplement No. 17 dated January 16, 2007,
that Prospectus Supplement No. 18 dated February 5, 2007, that Prospectus
Supplement No. 19 dated February 28, 2007, that Prospectus Supplement No. 20
dated March 5, 2007, that Prospectus Supplement No. 21 dated March 15, 2007,
that Prospectus Supplement No. 22 dated March 16, 2007, that Prospectus
Supplement No. 23 dated March 20, 2007, that Prospectus Supplement No. 24 dated
March 23, 2007, that Prospectus Supplement No. 25 dated March 29, 2007, and that
Prospectus Supplement No. 26 dated April 2, 2007), or the Prospectus, relating
to the offer and sale of up to 7,790,974 shares of our common stock to be issued
pursuant to awards granted or to be granted under our 2002 Stock Incentive Plan,
or our 2002 Plan, up to 147,510 shares of our common stock to be issued pursuant
to our 2002 Employee Stock Purchase Plan, or our 2002 ESPP, and up to 50,309
shares of our common stock which may be offered from time to time by the selling
stockholders identified on page 110 of the Prospectus for their own accounts.
Each of the selling stockholders named in the Prospectus acquired the shares of
common stock upon exercise of options previously granted to them as an employee,
director or consultant of Ligand or as restricted stock granted to them as a
director of Ligand, in each case under the terms of our 2002 Plan. We will not
receive any of the proceeds from the sale of the shares of our common stock by
the selling stockholders under the Prospectus. We will receive proceeds in
connection with option exercises under the 2002 Plan and shares issued under the
2002 ESPP which will be based upon each granted option exercise price or
purchase price, as applicable.

         This Prospectus Supplement No. 27 includes the attached Current Report
on Form 8-K of Ligand Pharmaceuticals Incorporated dated May 4, 2007, as filed
by us with the Securities and Exchange Commission.

         This Prospectus Supplement No. 27 should be read in conjunction with,
and delivered with, the Prospectus and is qualified by reference to the
Prospectus except to the extent that the information in this Prospectus
Supplement No. 27 updates or supersedes the information contained in the
Prospectus.

         Our common stock is traded on The Nasdaq Global Market under the symbol
"LGND." On May 3, 2007, the closing price of our common stock was $7.16 per
share.

         Investing in our common stock involves risk. See "Risk Factors"
beginning on page 7 of the Prospectus and beginning on page 17 of Prospectus
Supplement No. 22.

         Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if the
Prospectus or this Prospectus Supplement No. 27 is truthful or complete. Any
representation to the contrary is a criminal offense.

          The date of this Prospectus Supplement No. 27 is May 4, 2007.








                       SECURITIES AND EXCHANGE COMMISSION


                             WASHINGTON, D.C. 20549

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



                                    FORM 8-K

                                 CURRENT REPORT




     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

        Date of Report (Date of earliest event reported): April 30, 2007

                       LIGAND PHARMACEUTICALS INCORPORATED
             (Exact name of registrant as specified in its charter)

                                    DELAWARE
                 (State or other jurisdiction of incorporation)

                                    000-20720
                            (Commission File Number)

                           10275 Science Center Drive,
                              San Diego, California
                    (Address of principal executive offices)

                                 (858) 550-7500
              (Registrant's telephone number, including area code)

                                   77-0160744
                      (I.R.S. Employer Identification No.)

                                   92121-1117
                                   (Zip Code)







Item 1.02 Termination of a Material Definitive Agreement.

         On April 30, 2007, Ligand Pharmaceuticals Incorporated (the "Company")
entered into a letter agreement ("Letter Agreement") with Cardinal Health PTS,
LLC ("Cardinal") which terminated, without penalty to either party, that certain
Manufacturing and Packaging Agreement dated February 13, 2004, as amended (the
"Manufacturing Agreement"), and those certain Quality Agreements for AVINZA(R),
dated April 12, 2005 and April 10, 2006, respectively. In connection with the
termination, the Company and Cardinal agreed that certain provisions of the
Manufacturing Agreement would survive and Cardinal would continue to perform
limited services. Cardinal will also continue to manufacture LGD4665 capsules
for the Company pursuant under the terms of a separate agreement. The Letter
Agreement also contained a mutual general release of all claims arising from or
related to the Manufacturing Agreement.

         In connection with the Company's previously announced sale of the
AVINZA product line to King Pharmaceuticals, the Company and King
Pharmaceuticals agreed that the Manufacturing Agreement would not be assigned or
transferred to King Pharmaceuticals, and that the Company would be responsible
for winding down the contract and any resulting liabilities. The Company does
not expect to incur any material costs related to the termination of the
Manufacturing Agreement.

         The foregoing description of the Letter Agreement does not purport to
be complete and is qualified in its entirety by reference to the text of the
Letter Agreement, a copy of which will be filed as an exhibit to the Company's
Quarterly Report on Form 10-Q for the quarterly period ending June 30, 2007.
The Company intends to request confidential treatment on certain portions of the
Letter Agreement

Item 5.02 Departure of Directors or Principal Officers; Election of Directors;
Appointment of Principal Officers; Compensatory Arrangements of Certain
Officers.

         On April 30, 2007, the Company announced the appointment of John P.
Sharp, as Vice President of Finance and Chief Financial Officer, effective as of
such date. Mr. Sharp succeeds Tod G. Mertes, who has served as interim Chief
Financial Officer of the Company since January 2007. Mr. Sharp will report to
John L. Higgins, the Company's President and Chief Executive Officer.

         Prior to joining the Company, Mr. Sharp served as Vice President,
Finance, of Sequenom, Inc., a maker of genetic-analysis products from November
2004, and served as its Principal Financial and Accounting Officer and Treasurer
since October 2005. From August 2000 to November 2004, Mr. Sharp was Director of
Accounting at Diversa Corporation, a publicly traded biotech company, where he
was responsible for managing the overall accounting function, including
financial reporting, internal controls, and corporate governance. From January
1994 until August 2000, Mr. Sharp held various positions, most recently Senior
Audit Manager, at PricewaterhouseCoopers. Mr. Sharp received a B.S. in business
administration with an emphasis in accounting from San Diego
State University.

         The terms of Mr. Sharp's appointment are governed by an offer letter
("Offer Letter") between him and the Company dated March 30, 2007. The principal
terms of the Offer Letter include:

           o   base salary of $210,000 per year,
           o   performance bonus opportunity with a target of 30% of
               salary, up to a maximum of 40%,
           o   stock option grant award to purchase 50,000 shares, vesting
               over four years, and
           o   restricted stock grant of 15,000 shares, vesting over three
               years.

         The foregoing description of the Offer Letter does not purport to be
complete and is qualified in its entirety by reference to the text of the Offer
Letter, a copy of which is attached as Exhibit 10.1 to this current report on
Form 8-K and incorporated herein by reference.

         A copy of the press release dated April 30, 2007
announcing Mr. Sharp's appointment is attached hereto as Exhibit 99.1 and is
incorporated herein by reference.

Item 9.01  Financial Statements and Exhibits.

(d) Exhibits.

    Exhibit No.     Description

    10.1            Offer Letter, by and between the Company and John P. Sharp,
                    dated March 30, 2007
    99.1            Press Release of the Company, dated April 30, 2007







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


                                          LIGAND PHARMACEUTICALS INCORPORATED



Date: May 4, 2007         By:      /s/ Charles S. Berkman
                          Name:    Charles S. Berkman
                          Title:   Vice President, General Counsel and Secretary






                                  EXHIBIT INDEX



Exhibit
Number       Description of Exhibit
 10.1        Offer Letter, by and between the Company and John P. Sharp, dated
             March 30, 2007
 99.1        Press Release of the Company, dated April 30, 2007




                                                                    EXHIBIT 10.1


                                                                John L. Higgins
                                          President and Chief Executive Officer



March 30, 2007


John P. Sharp
[ADDRESS OMITTED]
San Diego, CA  XXXXX


Dear John:

I am pleased to extend to you an offer to become Vice President and Chief
Financial Officer and corporate officer of Ligand Pharmaceuticals Inc.reporting
to me commencing on Monday, April 23, 2007. This offer and your continued
employment are contingent upon your truthful representations to be provided in
the employment application and upon our completion of background checks,
including employment and criminal, satisfactory to the Company. The particulars
of our offer are as follows:


COMPENSATION

1.   Your initial base salary will be $210,000.00 per year

2.   You will participate in the Bonus Incentive Plan for Vice Presidents based
     upon achievement of pre-agreed goals (a target bonus of 30% of your annual
     base salary, up to a maximun of 40%).

3.   You will be granted an option to purchase at your election 50,000 options
     of the Company's common stock at its "fair market price" under our current
     Employee Stock Option Plan. The Agreement includes a four-year
     vesting/repurchasing provision. The grant will be subject to your execution
     of the Company's Incentive Stock Option Agreement. The Compensation
     Committee of the Board of Directors has approved your grant to be effective
     on your date of hire. Subject to Shareholder approval you will be granted
     15,000 shares of restricted stock at its "fair market price" or less with a
     three-year vesting. In the event that approval by the Shareholders is not
     successful your restricted stock grant will be granted under current
     practices.


BENEFITS

As a regular employee of Ligand, you will become eligible to participate in
Company-sponsored benefits. Your medical benefits will be effective on the first
day of the month following your employment date. Ligand's total compensation
package, including salary, equity participation in the company, and the benefits
program, when viewed in its entirety, is one of the best in the pharmaceutical
industry. The benefits will be described in detail to you during your
Orientation on Monday, April 23, 2007 at 08:00 a.m. at the 10275 Science Center
Drive location. As part of your orientation, you will be asked to complete
Form W-4, Employee's Withholding Allowance Certificate. For this process you are
requested to present your Social Security Card at the orientation.

Employment with Ligand is not for a specific term and can be terminated by you
or by the Company at any time for any reason, with or without cause. Any
contrary representations which may have been made or which may be made to you
are superseded by this offer. We request that all of our employees, to the
extent possible, give us advance notice if they intend to resign. If you accept
this offer, the terms and conditions in this letter shall be the terms of your
employment. Any modifications or additions to these terms would have to be in
writing and signed by you and me.

Your employment pursuant to this offer is contingent on your completion of an
employment physical evaluation, executing the Proprietary Information and
Inventions Agreement and upon your providing the Company with the legally
required proof of your identity and authorization to work in the
placecountry-regionUnited States. Typically, a driver's license with photograph
and a social security card, or a passport will be sufficient and should be
brought with you to Orientation on your first day of work.

We hope that you will accept our offer of employment. If you accept the offer
described herein, please return to me the signed original of this letter, the
executed Proprietary Information and Inventions Agreement, completed Employment
Application and executed background authorization form. This offer, if not
accepted, will expire on Wednesday, April 04, 2007. If you have any questions,
please call me at (858) 550-7582.






John, all of us are excited about having you join the dynamic team at Ligand and
we believe our professional association with you will be mutually rewarding. We
are truly looking forward to working with you in building an exciting new
company.

Sincerely,

LIGAND PHARMACEUTICALS INC.

/s/ John L. Higgins

John L. Higgins
President & Chief Executive Officer

:ac


Enclosures


Agreed and Accepted:

/s/ John Sharp

John P. Sharp                               Date: 04/02/07






                                                                    EXHIBIT 99.1



[LIGAND LETTERHEAD]

Contacts:
Ligand Pharmaceuticals Incorporated               Lippert/Heilshorn & Associates
John L. Higgins, President and CEO  or            Don Markley
Erika Luib-De la Cruz, Investor Relations         dmarkley@lhai.com
(858) 550-7896                                    (310) 691-7100


                 Ligand Names John Sharp Chief Financial Officer


SAN DIEGO (April 30, 2007) - Ligand Pharmaceuticals Incorporated (NASDAQ: LGND)
today announced that John P. Sharp has been appointed Vice President of Finance
and Chief Financial Officer, effective April 30, 2007. Mr. Sharp replaces
Interim CFO, Tod Mertes, and will report to John L. Higgins, Ligand's President
and Chief Executive Officer.
         "We are very pleased to have John Sharp join our organization. John is
a seasoned industry veteran with in-depth knowledge of the biotech industry and
broad accounting and financial management experience in public companies. His
addition to the management team will provide new financial and accounting
leadership at this important time for Ligand as we move through our activities
to rebuild Ligand," said John L. Higgins, Ligand's President and Chief Executive
Officer. "I would like to thank Tod Mertes for his valuable contribution as
Interim CFO. He has provided great service to Ligand and has been instrumental
in our efforts to restructure Ligand into a focused, emerging R&D and
royalty-driven biotech company."
         Prior to joining Ligand, Mr. Sharp served as Vice President of Finance
and Principal Accounting Officer for Sequenom, (NASDAQ: SQNM). While at
Sequenom, he played an important management role, responsible for worldwide
accounting, SEC reporting, financial and administrative management and investor
relations. From August 2000 to November 2004, Mr. Sharp served as Director of
Accounting at Diversa Corporation, a publicly traded biotech company, where he
was responsible for managing the overall accounting function, including
financial reporting, internal controls, and corporate governance, during a
period of significant company growth. From January 1994 to August 2000, Mr.
Sharp was at the public accounting firm PricewaterhouseCoopers, most recently as
a Senior Audit Manager. He received a Bachelor of Science from placePlaceNameSan
Diego PlaceTypeState PlaceTypeUniversity, and is a Certified Public Accountant
and a member of the Association of Bioscience Financial Officers.

About Ligand Pharmaceuticals
         Ligand discovers and develops new drugs that address critical unmet
medical needs of patients in the areas of thrombocytopenia, cancer, hepatitis C,
hormone-related diseases, osteoporosis and inflammatory diseases. Ligand's
proprietary drug discovery and development programs are based on its leadership
position in gene transcription technology, primarily related to intracellular
receptors.

Forward-Looking Statements
         This news release contains certain forward-looking statements by
Ligand, including statements regarding the development of financial strategies
and controls necessary for future growth, which involve risks and uncertainties
and reflect Ligand's judgment as of the date of this release. Actual events or
results may differ from Ligand's expectations. For example, we may not be able
to timely or successfully transform the Company or advance any product(s) in our
pipeline. In addition, we may not be able to successfully implement our
strategy, and continue the development of our proprietary programs. Additional
information concerning these and other risk factors affecting Ligand's business
can be found in prior press releases available via the Company's web site,
www.ligand.com, as well as in Ligand's public periodic filings with the
Securities and Exchange Commission at www.sec.gov. Ligand disclaims any intent
or obligation to update these forward-looking statements beyond the date of this
release. This caution is made under the safe harbor provisions of the Private
Securities Litigation Reform Act of 1995.

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