Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF 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
OMB APPROVAL
OMB Number: 3235-0104
Expires: January 31, 2005
Estimated average burden hours per response... 0.5

(Print or Type Responses)
1. Name and Address of Reporting Person *
  Ahlstrom Lee Michael
 2. Date of Event Requiring Statement (Month/Day/Year)
04/29/2011		 3. Issuer Name and Ticker or Trading Symbol
Noble Corp / Switzerland [NE]
(Last)
(First)
(Middle)
8518 WYNDHAM COURT		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Sr. VP - Strategic Development
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

HOUSTON, TX 77040		 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 Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Shares 29,405 (1)
D
 
Shares 216.5429
I
By Trust (2)
Shares 133.1952
I
By Trust (3)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
Persons who 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.

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Options   (4) 02/13/2017 Shares 3,814 $ 35.79 D  
Stock Options   (5) 02/07/2018 Shares 3,600 $ 43.01 D  
Stock Options   (6) 02/25/2019 Shares 6,893 $ 24.66 D  
Stock Options   (7) 02/06/2020 Shares 3,655 $ 39.46 D  
Stock Options   (8) 02/04/2021 Shares 4,528 $ 37.71 D  
Restricted Stock Units   (10)   (10) Shares 2,028 $ 0 (9) D  
Restricted Stock Units   (11)   (11) Shares 3,182 $ 0 (9) D  
Performance Vested Restricted Stock Units   (12)   (12) Shares 6,010 $ 0 (12) D  
Performance Vested Restricted Stock Units   (13)   (13) Shares 7,134 $ 0 (13) D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Ahlstrom Lee Michael
8518 WYNDHAM COURT
HOUSTON, TX 77040		       Sr. VP - Strategic Development  

Signatures

/s/ Julie J. Robertson By Power of Attorney Dated May 3, 2011 05/06/2011
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(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) Includes 1,622 shares awarded as Time Vested Restricted Stock and 13,183 shares awarded as Performance Vested Restricted Stock
(2) Shares held in the Noble Drilling Corporation 401(k) Savings Plan
(3) Shares held in the Noble Drilling Corpoation 401(k) Restoration Plan
(4) The stock options vest in three equal annual installments beginning on the first anniversay of the grant date; 1,271 exercisable on 2/13/2008, 1,271 exercisable on 2/13/2009, 1,272 exercisable on 2/13/2010
(5) The stock options vest in three equal annual installments beginning on the first anniversay of the grant date; 1,200 exercisable on 2/7/2009, 1,200 exercisable on 2/7/2010, 1,200 exercisable on 2/7/2011
(6) The stock options vest in three equal annual installments beginning on the first anniversay of the grant date; 2,297 exercisable on 2/25/2010, 2,298 exercisable on 2/25/2011, 2,298 exercisable on 2/25/2012
(7) The stock options vest in three equal annual installments beginning on the first anniversay of the grant date; 1,218 exercisable on 2/6/2011, 1,218 exercisable on 2/6/2012, 1,219 exercisable on 2/6/2013
(8) The stock options vest in three equal annual installments beginning on the first anniversay of the grant date; 1,509 exercisable on 2/4/2012, 1,509 exercisable on 2/4/2013, 1,510 exercisable on 2/4/2014
(9) Each restricted stock unit represents a contingent right to receive one share
(10) The restricted stock units vest and settle as follows: 1,014 vest on 2/6/2012, 1,014 vest on 2/6/2013
(11) The restricted stock units vest and settle as follows: 1,060 vest on 2/4/2012, 1,061 vest on 2/4/2013, 1,061 vest on 2/4/2014
(12) Each Performance Vested Restricted Stock Unit represents a contingent right to receive one share. Performance Vested Restricted Stock Units vest upon the company achieving a total shareholder return over a three-year performance cycle (2010-2012) relative to a specified peer group(s). Grant date was 2/6/2010
(13) Each Performance Vested Restricted Stock Unit represents a contingent right to receive one share. Performance Vested Restricted Stock Units vest upon the company achieving a total shareholder return over a three-year performance cycle (2011-2013) relative to a specified peer group(s). Grant date was 2/4/2011

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, See Instruction 6 for procedure.

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 number.