Alexion Pharmaceuticals, Inc. Watch

from 8-K 37 pages Alexion Pharmaceuticals, Inc. Common Stock Underwriting Agreement May 24, 2012 1

from SC 13G/A 1 page Exhibit 1 Power of Attorney for Certain Filings Under the Securities Exchange Act of 1934

from 8-K 33 pages 3,000,000 Shares Alexion Pharmaceuticals, Inc. Common Stock, Par Value $0.0001 Per Share Underwriting Agreement November 15, 2006

from 8-K 24 pages 2,500,000 Shares Alexion Pharmaceuticals, Inc. Common Stock, Par Value $0.0001 Per Share Underwriting Agreement

from 8-K 31 pages 5,000,000 Shares Alexion Pharmaceuticals, Inc. Common Stock, Par Value $0.0001 Per Share Underwriting Agreement

from 8-K ~50 pages Underwriting Agreement Dated September 12, 2003

from SC 13G/A 1 page Exhibit 1.1 Joint Filing Agreement the Undersigned Hereby Agree That the Statement on This Schedule 13g/A, Dated May 1, 2003, (The "Schedule 13g/A"), With Respect to the Common Stock, Par Value $0.0001 Per Share, of Alexion Pharmaceuticals, Inc. Is Filed on Behalf of Each of US Pursuant to and in Accordance With the Provisions of Rule 13d-1(k) Under the Securities and Exchange Act of 1934, as Amended, and That This Agreement Shall Be Included as an Exhibit to This Schedule 13g/A. Each of the Undersigned Agrees to Be Responsible for the Timely Filing of the Schedule 13g/A, and for the Completeness and Accuracy of the Information Concerning Itself Contained Therein. This Agreement May Be Executed in Any Number of Counterparts, All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Have Executed This Agreement as of the 1st Day of May, 2003. Orbimed Advisors LLC By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: Managing Member Orbimed Capital LLC By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: Managing Member By: /S/ Samuel D. Isaly Name: Samuel D. Isaly

from SC 13G/A 1 page Exhibit 1.1 Joint Filing Agreement the Undersigned Hereby Agree That the Statement on This Schedule 13g/A, Dated May 1, 2003, (The "Schedule 13g/A"), With Respect to the Common Stock, Par Value $0.0001 Per Share, of Alexion Pharmaceuticals, Inc. Is Filed on Behalf of Each of US Pursuant to and in Accordance With the Provisions of Rule 13d-1(k) Under the Securities and Exchange Act of 1934, as Amended, and That This Agreement Shall Be Included as an Exhibit to This Schedule 13g/A. Each of the Undersigned Agrees to Be Responsible for the Timely Filing of the Schedule 13g/A, and for the Completeness and Accuracy of the Information Concerning Itself Contained Therein. This Agreement May Be Executed in Any Number of Counterparts, All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Have Executed This Agreement as of the 1st Day of May, 2003. Orbimed Advisors LLC By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: Managing Member Orbimed Capital LLC By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: Managing Member By: /S/ Samuel D. Isaly Name: Samuel D. Isaly

from SC 13G/A 1 page Exhibit 1.1 Joint Filing Agreement the Undersigned Hereby Agree That the Statement on This Schedule 13g/A, Dated Febraury 14, 2003, (The "Schedule 13g/A"), With Respect to the Common Stock, Par Value $0.0001 Per Share, of Alexion Pharmaceuticals, Inc. Is Filed on Behalf of Each of US Pursuant to and in Accordance With the Provisions of Rule 13d-1(k) Under the Securities and Exchange Act of 1934, as Amended, and That This Agreement Shall Be Included as an Exhibit to This Schedule 13g/A. Each of the Undersigned Agrees to Be Responsible for the Timely Filing of the Schedule 13g/A, and for the Completeness and Accuracy of the Information Concerning Itself Contained Therein. This Agreement May Be Executed in Any Number of Counterparts, All of Which Taken Together Shall Constitute One and the Same Instrument. in Witness Whereof, the Undersigned Have Executed This Agreement as of the 14th Day of February, 2003. Orbimed Advisors Inc. By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: President Orbimed Advisors LLC By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: President of Managing Member, Orbimed Advisors Inc. Orbimed Capital LLC By: /S/ Samuel D. Isaly Name: Samuel D. Isaly Title: Managing Member By: /S/ Samuel D. Isaly Name: Samuel D. Isaly

from 8-K ~20 pages Underwriting agreement

from S-3/A ~20 pages Underwriting agreement

from SC 13D/A 1 page <page> 1 Joint Filing Agreement We, the Undersigned, Hereby Express Our Agreement That the Attached Schedule 13d (Including All Amendments Thereto) Is Filed on Behalf of Each of the Undersigned. Bb Biotech AG Date: December 18, 1997 By: /S/ Hans-Joerg Graf Name: Hans-Joerg Graf Date: December 18, 1997 By: /S/ Dr. Victor Bischoff Name: Dr. Victor Bischoff Biotech Target S.A. Date: December 18, 1997 By: /S/ Dr. Andreas Bremer Name: Dr. Andreas Bremer Date: December 18, 1997 By: /S/ Dr. Anders Hove Name: Dr. Anders Hove Page 9 of 9

from SC 13D/A 1 page Power of Attorney in Favor of Dr. Andreas Bremer

from SC 13D 1 page Power of Attorney in Favor of Dr. Andreas Bremer

from 8-K ~50 pages Rights Agreement

from 8-A12G ~50 pages Rights Agreement