X0202 4 2008-05-15 1 0001060736 SEATTLE GENETICS INC /WA SGEN 0001106607 JP MORGAN PARTNERS BHCA LP J.P. MORGAN PARTNERS, LLC 270 PARK AVENUE NEW YORK NY 10017 0 0 1 0 Class A Common Stock 2263980 D Class A Common Stock 2008-05-15 4 S 0 12328 10.14 D 523403 I See Footnote Class A Common Stock 2008-05-15 4 S 0 1681 10.14 D 71352 I See Footnote Class A Common Stock 2008-05-15 4 S 0 6257 10.14 D 265662 I See Footnote Class A Common Stock 2008-05-15 4 S 0 697 10.14 D 29598 I See Footnote Class A Common Stock 2008-05-15 4 S 0 4633 10.14 D 196693 I See Footnote Class A Common Stock 2008-05-15 4 S 0 73162 10.14 D 842334 I See Footnote Class A Common Stock 2008-05-15 4 S 0 621 10.14 D 26383 I See Footnote Class A Common Stock 2008-05-15 4 S 0 621 10.14 D 26383 I See Footnote Warrants 6.25 2003-07-08 2011-12-31 Common Stock 469594 469594 D Warrants 6.25 2003-07-08 2011-12-31 Common Stock 101421 101421 I (FN) Warrants 6.25 2003-07-08 2011-12-31 Common Stock 13826 13826 I (FN) Warrants 6.25 2003-07-08 2011-12-31 Common Stock 51478 51478 I (FN) Warrants 6.25 2003-07-08 2011-12-31 Common Stock 5736 5736 I (FN) Warrants 6.25 2003-07-08 2011-12-31 Common Stock 38114 38114 I (FN) Warrants 6.25 2003-07-08 2011-12-31 Common Stock 132331 132331 I (FN) Stock Options (Right to Purchase) 7.26 2005-05-16 2014-05-16 Common Stock 10000 10000 I (FN) Stock Options (Right to Purchase) 5.11 2006-05-12 2015-05-12 Common Stock 10000 10000 I (FN) Stock Options (Right to Purchase) 10.20 2008-05-24 2017-05-25 Common Stock 10000 10000 I (FN) The amount shown represents the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners Global Investors, L.P. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners Global Investors A, L.P. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners Global Investors (Cayman), L.P. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners Global Investors (Cayman) II, L.P. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners Global Investors (Selldown), L.P. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by J.P. Morgan Partners Global Investors (Selldown) II, L.P. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by H&Q Holdings, Inc. The Reporting Person has no pecuniary interest in such securities. The amount shown represents the beneficial ownership of the Issuer's equity securities by H&Q Employee Venture Fund 2000, L.P. The Reporting Person has no pecuniary interest in such securities. These options were granted to Srinivas Akkaraju, a director of the Issuer. Mr. Akkaraju is obligated to transfer any shares issued under the Stock Option to J.P. Morgan Partners (BHCA), L.P. ("JPM BHCA") at the request of JPM BHCA. $10.14 represents an average per share sale price for the shares sold on 5/15/2008. The sale price for shares sold on this day ranged from $10.03 to $10.36. /s/ John C Wilmot, Manager Director, J.P. Morgan Partners (BHCA), L.P., JPMP Master Fund Manager, L.P., its general partner, JPMP Capital Corp., its general partner 2008-05-19