Ownership Submission
FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
Singh Shawn
   2. Issuer Name and Ticker or Trading Symbol
Excaliber Enterprises, Ltd. [EXCA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
CHIEF EXECUTIVE OFFICER
(Last)
(First)
(Middle)
384 OYSTER POINT BLVD., NO. 8		 3. Date of Earliest Transaction (Month/Day/Year)
05/11/2011
(Street)

SOUTH SAN FRANCISCO, CA 94080		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 05/11/2011   A   76,087 A $ 3.5 (1) 76,087 I By Trust (2)

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (Right to Buy) $ 4.2 05/11/2011   A   10,000     (3) 01/17/2018 Common Stock 10,000 (4) 10,000 D  
Stock Option (Right to Buy) $ 4.2 05/11/2011   A   10,000     (3) 01/17/2018 Common Stock 10,000 (4) 10,000 D  
Stock Option (Right to Buy) $ 2.26 05/11/2011   A   30,000     (5) 03/24/2019 Common Stock 30,000 (6) 30,000 D  
Stock Option (Right to Buy) $ 2.26 05/11/2011   A   11,250     (7) 06/17/2019 Common Stock 11,250 (8) 11,250 D  
Stock Option (Right to Buy) $ 3 05/11/2011   A   500,000     (9) 11/04/2019 Common Stock 500,000 (10) 500,000 D  
Stock Option (Right to Buy) $ 3 05/11/2011   A   212,500     (11) 12/30/2019 Common Stock 212,500 (12) 212,500 D  
Stock Option (Right to Buy) $ 3.5 05/11/2011   A   50,000     (13) 04/26/2021 Common Stock 50,000 (14) 50,000 D  
Warrant $ 3.5 05/11/2011   A   750   07/28/2006 12/31/2013 Common Stock 750 (15) 750 D  
Stock Option (Right to Buy) $ 1.6 05/11/2011   A   10,000   12/21/2007 12/21/2016 Common Stock 10,000 (16) 10,000 I By Trust (2)
Stock Option (Right to Buy) $ 1.44 05/11/2011   A   20,000   01/01/2009 05/17/2017 Common Stock 20,000 (17) 20,000 I By Trust (2)
Warrant $ 3.5 05/11/2011   A   40,169   08/25/2008 12/31/2013 Common Stock 40,169 (18) 40,169 I By Trust (2)
Warrant $ 3.5 05/11/2011   A   17,857   08/25/2008 12/31/2013 Common Stock 17,857 (19) 17,857 I By Trust (2)

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Singh Shawn
384 OYSTER POINT BLVD., NO. 8
SOUTH SAN FRANCISCO, CA 94080		       CHIEF EXECUTIVE OFFICER  

Signatures

 /s/ Shawn K. Singh   05/25/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Shares received in a stock-for-stock exchange of shares of VistaGen Therapeutics Inc. ("VistaGen") Common Stock in connection with the Agreement and Plan of Merger by and among VistaGen, the Issuer and a wholly-owned subsidiary of Issuer, such that VistaGen became a wholly-owned subsidiary of Issuer (the "Merger"). The exchange ratio in connection with the Merger was one share of VistaGen Common Stock at a price of $1.75 per share for 0.5 shares of Issuer Common Stock at a price of $3.50 per share (the "Exchange Ratio"). All shares reflected in the Tables and the footnotes give effect to the Exchange Ratio.
(2) Held by The 1997 Singh Family Trust U/R/D 5/29/97.
(3) Options vest monthly over a period of four years commencing January 17, 2008, with a twelve-month cliff of 25% of the shares.
(4) Received in the Merger in exchange for an employee stock option to acquire 10,000 shares of VistaGen common stock for $4.20 per share.
(5) Options vest monthly over a period of four years commencing March 24, 2009, with a twelve-month cliff of 25% of the shares.
(6) Received in the Merger in exchange for an employee stock option to acquire 30,000 shares of VistaGen common stock for $2.26 per share.
(7) Options vest 50% after three months and 50% after six months commencing June 17, 2009.
(8) Received in the Merger in exchange for an employee stock option to acquire 11,250 shares of VistaGen common stock for $2.26 per share.
(9) Options vest monthly over a period of two years commencing January 17, 2008, with a twelve-month cliff of 50% of the shares.
(10) Received in the Merger in exchange for an employee stock option to acquire 500,000 shares of VistaGen common stock for $3.00 per share.
(11) Options vest monthly over a period of three years commencing December 31, 2009, with a twelve-month cliff of 50% of shares.
(12) Received in the Merger in exchange for an employee stock option to acquire 212, 500 shares of VistaGen common stock for $3.00 per share.
(13) Options vest monthly over a period of four years commencing April 25, 2011, with a twelve-month cliff of 25% of the shares.
(14) Received in the Merger in exchange for an employee stock option to acquire 50,000 shares of VistaGen common stock for $3.50 per share.
(15) Received in the Merger in exchange for a warrant to acquire 750 shares of VistaGen common stock for $3.50 per share.
(16) Received in the Merger in exchange for an employee stock option to acquire 10,000 shares of VistaGen common stock for $1.60 per share.
(17) Received in the Merger in exchange for an employee stock option to acquire 20,000 shares of VistaGen common stock for $1.44 per share.
(18) Received in the Merger in exchange for a warrant to acquire 40,169 shares of VistaGen common stock for $3.50 per share.
(19) Received in the Merger in exchange for a warrant to acquire 17,857 shares of VistaGen common stock for $3.50 per share.

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