gastar13d.htm

CUSIP No. 367299104

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
OMB APPROVAL
OMB Number:  3235-0145
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SCHEDULE 13D
 

 
Under the Securities Exchange Act of 1934
 
(Amendment No. 6)*
 

Gastar Exploration Ltd.

(Name of Issuer)

Common Shares, no par value

(Title of Class of Securities)

367299104

(CUSIP Number)

 
Warren T. Lazarow, Esq.
O’Melveny & Myers LLP
2765 Sand Hill Road
Menlo Park, CA  94025
(650) 473-2600
Paul S. Scrivano, Esq.
O’Melveny & Myers LLP
Times Square Tower
7 Times Square
New York, NY  10036
(212) 326-2000



(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)

August 30, 2010

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of sections 240.13d-1(e), 240.13d-1(f) or 140.13d-1(g), check the following box.  [ X ]
 
Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See section 240.13d-7 for other parties to whom copies are to be sent.
 
* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.
 
The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).
 
Potential persons who are to respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB control number.
 
Page 1 of 10
 
 
 
 

 
1.
Names of Reporting Persons

 
Palo Alto Investors, Inc.


 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
   
(a)
  
   
(b)
X


 
3.
SEC Use Only
  



 
4.
Source of Funds (See Instructions) 
AF


 
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ____


 
6.
Citizenship or Place of Organization 
California

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
7.           Sole Voting Power
0
8.           Shared Voting Power
3,564,594
9.           Sole Dispositive Power
0
10.           Shared Dispositive Power
3,564,594

 
11.
Aggregate Amount Beneficially Owned by Each Reporting Person                                    3,564,594


 
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
 
Instructions)


 
13.
Percent of Class Represented by Amount in Row (11) 
7.1%


 
14.
Type of Reporting Person (See Instructions) 
CO, HC


Page 2 of 10
 
 
 
 
 
 
1.
Names of Reporting Persons

 
Palo Alto Investors, LLC


 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
   
(a)
  
   
(b)
X


 
3.
SEC Use Only
  



 
4.
Source of Funds (See Instructions) 
AF


 
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ____


 
6.
Citizenship or Place of Organization 
California

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
7.           Sole Voting Power
0
8.           Shared Voting Power
3,564,594
9.           Sole Dispositive Power
0
10.           Shared Dispositive Power
3,564,594

 
11.
Aggregate Amount Beneficially Owned by Each Reporting Person                                    3,564,594


 
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
 
Instructions)


 
13.
Percent of Class Represented by Amount in Row (11) 
7.1%


 
14.
Type of Reporting Person (See Instructions) 
IA, OO


 
Page 3 of 10
 
 
 
 
 
 
1.
Names of Reporting Persons

 
William Leland Edwards


 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
   
(a)
  
   
(b)
X


 
3.
SEC Use Only
  



 
4.
Source of Funds (See Instructions) 
AF


 
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ____


 
6.
Citizenship or Place of Organization 
U.S.A.

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
7.           Sole Voting Power
28,000
8.           Shared Voting Power
3,564,594
9.           Sole Dispositive Power
28,000
10.           Shared Dispositive Power
3,564,594

 
11.
Aggregate Amount Beneficially Owned by Each Reporting Person                                    3,592,594


 
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
 
Instructions)______


 
13.
Percent of Class Represented by Amount in Row (11) 
7.1%


 
14.
Type of Reporting Person (See Instructions) 
IN, HC


 
Page 4 of 10
 
 
 
 
 
 
1.
Names of Reporting Persons

 
Anthony Joonkyoo Yun, MD


 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
   
(a)
  
   
(b)
X


 
3.
SEC Use Only
  



 
4.
Source of Funds (See Instructions) 
AF


 
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ____


 
6.
Citizenship or Place of Organization 
U.S.A.

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
7.           Sole Voting Power
0
8.           Shared Voting Power
3,564,594
9.           Sole Dispositive Power
0
10.           Shared Dispositive Power
3,564,594

 
11.
Aggregate Amount Beneficially Owned by Each Reporting Person                                    3,564,594


 
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
 
Instructions)


 
13.
Percent of Class Represented by Amount in Row (11) 
7.1%


 
14.
Type of Reporting Person (See Instructions) 
IN, HC


 
Page 5 of 10
 
 
 
 
 
 
1.
Names of Reporting Persons

 
Palo Alto Small Cap Master Fund, L.P.


 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
   
(a)
  
   
(b)
X


 
3.
SEC Use Only
  



 
4.
Source of Funds (See Instructions) 
AF


 
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ____


 
6.
Citizenship or Place of Organization 
Cayman Islands

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
7.           Sole Voting Power
0
8.           Shared Voting Power
2,485,022
9.           Sole Dispositive Power
0
10.           Shared Dispositive Power
2,485,022

 
11.
Aggregate Amount Beneficially Owned by Each Reporting Person                                    2,485,022


 
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
 
Instructions)


 
13.
Percent of Class Represented by Amount in Row (11) 
4.9%


 
14.
Type of Reporting Person (See Instructions) 
PN


 
Page 6 of 10
 
 
 
 
 
 
1.
Names of Reporting Persons

 
Palo Alto Small Cap Fund, L.P.


 
2.
Check the Appropriate Box if a Member of a Group (See Instructions)
   
(a)
  
   
(b)
X


 
3.
SEC Use Only
  



 
4.
Source of Funds (See Instructions) 
AF


 
5.
Check if Disclosure of Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e) ____


 
6.
Citizenship or Place of Organization 
Delaware

Number of
Shares
Beneficially
Owned by
Each Reporting
Person With
7.           Sole Voting Power
0
8.           Shared Voting Power
2,198,002
9.           Sole Dispositive Power
0
10.           Shared Dispositive Power
2,198,002

 
11.
Aggregate Amount Beneficially Owned by Each Reporting Person                                    2,198,002


 
12.
Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
 
Instructions)


 
13.
Percent of Class Represented by Amount in Row (11) 
4.4%


 
14.
Type of Reporting Person (See Instructions) 
PN


 
Page 7 of 10
 
 
 
 
 
This Amendment No. 6 (this “Amendment No. 6”) amends and supplements the Schedule 13D originally filed with the Securities and Exchange Commission on November 9, 2009, as amended by Amendment No. 1 on December 11, 2009, Amendment No. 2 on December 14, 2009, Amendment No. 3 on January 14, 2010, Amendment No. 4 on January 19, 2010 and Amendment No. 5 on May 17, 2010 (the “Amended Statement”) (the Amended Statement, together with this Amendment No. 6, are collectively referred to herein as the “Statement”), by William Leland Edwards, Palo Alto Investors, LLC, Palo Alto Investors, Inc., Palo Alto Small Cap Master Fund, L.P., Palo Alto Small Cap Fund, L.P., and Anthony Joonkyoo Yun, MD (collectively, the “Filers”).  Except as set forth in this Amendment No. 6, all information set forth in the Amended Statement remains unchanged and capitalized terms used but not defined in this Amendment No. 6 shall have the meanings ascribed to such terms in the Amended Statement.


Item 5.    Interest in Securities of the Issuer
 
(c)  Listed below are all the transactions in the Stock by the Filers during the last 60 days.  The sales were effected in open market transactions.  There were no other transactions in the Stock by the Filers during such period.
 

Filer
Date
Transaction
Purchased or Sold
Average Price Per Share
PAI, LLC
7/20/2010
Sale
                             1,300
 $                                 3.79
PAI, LLC
7/21/2010
Sale
                                400
 $                                 3.88
PAI, LLC
7/22/2010
Sale
                             3,700
 $                                 3.83
PAI, LLC
7/23/2010
Sale
                             7,000
 $                                 3.98
PAI, LLC
7/26/2010
Sale
                             2,900
 $                                 4.00
PAI, LLC
7/27/2010
Sale
                             3,000
 $                                 3.99
PAI, LLC
7/28/2010
Sale
                             1,500
 $                                 3.90
PAI, LLC
7/29/2010
Sale
                             2,300
 $                                 3.99
PAI, LLC
7/30/2010
Sale
                             1,800
 $                                 4.04
PAI, LLC
8/2/2010
Sale
                             6,000
 $                                 4.05
PAI, LLC
8/3/2010
Sale
                             2,600
 $                                 4.07
PAI, LLC
8/4/2010
Sale
                             1,500
 $                                 4.03
PAI, LLC
8/5/2010
Sale
                             1,700
 $                                 4.02
PAI, LLC
8/6/2010
Sale
                             3,600
 $                                 3.99
PAI, LLC
8/9/2010
Sale
                             1,700
 $                                 3.95
PAI, LLC
8/10/2010
Sale
                             4,000
 $                                 3.76
PAI, LLC
8/25/2010
Sale
                           16,900
 $                                 3.03
PAI, LLC
8/26/2010
Sale
                           16,800
 $                                 3.01
PAI, LLC
8/27/2010
Sale
                           33,600
 $                                 3.02
PAI, LLC
8/30/2010
Sale
                           40,900
 $                                 2.89
Small Cap Master
7/20/2010
Sale
                             3,100
 $                                 3.79
Small Cap Master
7/21/2010
Sale
                                900
 $                                 3.88
Small Cap Master
7/22/2010
Sale
                             8,500
 $                                 3.83
Small Cap Master
7/23/2010
Sale
                           15,900
 $                                 3.98
Small Cap Master
7/26/2010
Sale
                             6,700
 $                                 4.00
 
Page 8 of 10
 
 
 
 
 
Small Cap Master
7/27/2010
Sale
                             7,100
 $                                 3.99
Small Cap Master
7/28/2010
Sale
                             3,600
 $                                 3.90
Small Cap Master
7/29/2010
Sale
                             5,000
 $                                 3.99
Small Cap Master
7/30/2010
Sale
                             4,200
 $                                 4.05
Small Cap Master
8/2/2010
Sale
                           13,800
 $                                 4.05
Small Cap Master
8/3/2010
Sale
                             6,250
 $                                 4.07
Small Cap Master
8/4/2010
Sale
                             3,600
 $                                 4.03
Small Cap Master
8/5/2010
Sale
                             3,800
 $                                 4.02
Small Cap Master
8/6/2010
Sale
                             8,200
 $                                 3.99
Small Cap Master
8/9/2010
Sale
                             3,900
 $                                 3.95
Small Cap Master
8/10/2010
Sale
                             9,400
 $                                 3.76
Small Cap Master
8/25/2010
Sale
                           38,600
 $                                 3.03
Small Cap Master
8/26/2010
Sale
                           38,600
 $                                 3.01
Small Cap Master
8/27/2010
Sale
                           77,200
 $                                 3.02
Small Cap Master
8/30/2010
Sale
                           94,400
 $                                 2.89

 
 
 
 
Page 9 of 10
 
 
 

 
SIGNATURES

After reasonable inquiry and to the best of my knowledge, I certify that the information set forth in this statement is true, complete and correct.

Dated:    August 31, 2010

PALO ALTO INVESTORS, INC.
 
 
By:           /s/ Mark Shamia                                           
Mark Shamia, Chief Operating Officer
 
PALO ALTO INVESTORS, LLC
 
 
By:           /s/ Mark Shamia                                           
Mark Shamia, Chief Operating Officer
PALO ALTO SMALL CAP MASTER FUND, L.P.
By:           Palo Alto Investors, LLC, General Partner
By:           Palo Alto Investors, Manager
By:           /s/ Mark Shamia                                           
Mark Shamia, Chief Operating Officer
 
PALO ALTO SMALL CAP FUND, L.P.
By:           Palo Alto Investors, LLC, General Partner
By:           Palo Alto Investors, Manager
By:           /s/ Mark Shamia                                           
Mark Shamia, Chief Operating Officer
 
 
/s/ Anthony Joonkyoo Yun                                                      
Anthony Joonkyoo Yun, MD
 
/s/ William Leland Edwards                                                      
William Leland Edwards



 
Page 10 of 10