HealthCor Management, L.P. – Underwriting Agreements Watch

from SC 13G 2 pages Exhibit 1 Joint Acquisition Statement Pursuant to Rule 13d-1

from SC 13D/A ~5 pages Underwriting agreement

from SC 13D/A ~5 pages Exhibit 1 Agreement of Joint Filing

from SC 13G 1 page Exhibit 1 Joint Acquisition Statement Pursuant to Rule 13d-1(k) the Undersigned Acknowledge and Agree That the Foregoing Statement on Schedule 13g Is Filed on Behalf of Each of the Undersigned and That All Subsequent Amendments to This Statement on Schedule 13g Shall Be Filed on Behalf of Each of the Undersigned Without the Necessity of Filing Additional Joint Acquisition Statements. the Undersigned Acknowledge That Each Shall Be Responsible for the Timely Filing of Such Amendments, and for the Completeness and Accuracy of the Information Concerning Him or It Contained Therein, but Shall Not Be Responsible for the Completeness and Accuracy of the Information Concerning the Others, Except to the Extent That He or It Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: February 21, 2007 Healthcor Management, L.P. By: Healthcor Associates, LLC, General Partner of Healthcor Management, L.P. By: /S/ Arthur Cohen Name: Arthur Cohen Title: Manager By: /S/ Joseph Healey Name: Joseph Healey Title: Manager /S/ Joseph Healey Joseph Healey, Individually /S/ Arthur Cohen Arthur Cohen, Individually

from SC 13D/A 2 pages [Healthcor Logo - Omitted] January 8, 2007 Icos Corporation 22021 20th Avenue Southeast Bothell, Wa 98021 Attn: Board of Directors Paul N. Clark James L. Ferguson Robert J. Herbold Jack W. Schuler Vaughn D. Bryson Gary L. Wilcox Teresa Beck Robert W. Pangia David V. Milligan Dear Gentlemen: Healthcor Management, L.P. (“Healthcor”) Is the Investment Advisor to Private Investment Funds That Currently Own 3,450,000 Shares of Icos Corporation (“Icos” or the “Company”). This Represents More Than 5% of All Icos Common Shares Outstanding

from PX14A6G 5 pages December 4, 2006 Healthcor Management, L.P. (“Healthcor”) Is the Investment Advisor to Certain Private Investment Funds That Currently Own 3,400,000 Shares of Icos Corporation (“Icos” or the “Company”). This Represents More Than 5% of All Icos Common Shares Outstanding.1

from SC 13D/A 6 pages December 4, 2006 Healthcor Management, L.P. (“Healthcor”) Is the Investment Advisor to Certain Private Investment Funds That Currently Own 3,400,000 Shares of Icos Corporation (“Icos” or the “Company”). This Represents More Than 5% of All Icos Common Shares Outstanding.1

from SC 13D/A 3 pages [Logo] November 13, 2006 Icos Corporation 22021 20th Avenue Southeast Bothell, Wa 98021 Attn: Board of Directors Paul N. Clark James L. Ferguson Robert J. Herbold Jack W. Schuler Vaughn D. Bryson Gary L. Wilcox Teresa Beck Robert W. Pangia David V. Milligan Dear Gentlemen: Healthcor Management, L.P. (“Healthcor”) Is the Investment Advisor to Certain Private Investment Funds That Currently Own 3,300,000 Shares of Icos Corporation (“Icos” or the “Company”). This Represents More Than 5% of All Icos Common Shares Outstanding.1

from SC 13D 9 pages [Healthcor Logo] November 2, 2006 Icos Corporation 22021 20th Avenue S.E. Bothell, Wa 98021 Attn: Board of Directors Paul N. Clark James L. Ferguson Robert J. Herbold Jack W. Schuler Vaughn D. Bryson Gary L. Wilcox Teresa Beck Robert W. Pangia David V. Milligan Dear Gentlemen: Healthcor Management, L.P. Is the Investment Advisor to Private Investment Funds That Currently Own 3,300,000 Shares of Icos Corporation (“Icos” or the “Company”). This Represents More Than 5% of All Icos Common Shares Outstanding.1

from SC 13G 1 page Exhibit 1 Joint Acquisition Statement Pursuant to Rule 13d-1(k) the Undersigned Acknowledge and Agree That the Foregoing Statement on Schedule 13g Is Filed on Behalf of Each of the Undersigned and That All Subsequent Amendments to This Statement on Schedule 13g Shall Be Filed on Behalf of Each of the Undersigned Without the Necessity of Filing Additional Joint Acquisition Statements. the Undersigned Acknowledge That Each Shall Be Responsible for the Timely Filing of Such Amendments, and for the Completeness and Accuracy of the Information Concerning Him or It Contained Therein, but Shall Not Be Responsible for the Completeness and Accuracy of the Information Concerning the Others, Except to the Extent That He or It Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: October 19, 2006 Healthcor Management, L.P. By: Healthcor Associates, LLC, General Partner of Healthcor Management, L.P. By: /S/ Arthur Cohen Name: Arthur Cohen Title: Manager By: /S/ Joseph Healey Name: Joseph Healey Title: Manager /S/ Joseph Healey Joseph Healey, Individually /S/ Arthur Cohen Arthur Cohen, Individually

from SC 13G 1 page Exhibit 1 Joint Acquisition Statement Pursuant to Rule 13d-1(k) the Undersigned Acknowledge and Agree That the Foregoing Statement on Schedule 13g Is Filed on Behalf of Each of the Undersigned and That All Subsequent Amendments to This Statement on Schedule 13g Shall Be Filed on Behalf of Each of the Undersigned Without the Necessity of Filing Additional Joint Acquisition Statements. the Undersigned Acknowledge That Each Shall Be Responsible for the Timely Filing of Such Amendments, and for the Completeness and Accuracy of the Information Concerning Him or It Contained Therein, but Shall Not Be Responsible for the Completeness and Accuracy of the Information Concerning the Others, Except to the Extent That He or It Knows or Has Reason to Believe That Such Information Is Inaccurate. Dated: June 2, 2006 Healthcor Management, L.P. By: Healthcor Associates, LLC, General Partner of Healthcor Management, L.P. By: /S/ Arthur Cohen Name: Arthur Cohen Title: Manager By: /S/ Joseph Healey Name: Joseph Healey Title: Manager /S/ Joseph Healey Joseph Healey, Individually /S/ Arthur Cohen Arthur Cohen, Individually