X0306 4 2014-08-06 0000907562 DYAX CORP DYAX 0001091925 KEMPNER THOMAS L C/O DYAX CORP. 55 NETWORK DRIVE BURLINGTON MA 01803 1 0 0 0 Common Stock 2014-08-06 4 S 0 25000 9.3387 D 833810 I By Loeb Holding Corporation Common Stock 2014-08-06 4 S 0 5000 9.3387 D 48764 I By Loeb Investors Co. IX Common Stock 2014-08-15 4 S 0 11245 9.8894 D 811520 I By Loeb Holding Corporation Common Stock 2014-08-15 4 S 0 4500 9.8894 D 39764 I By Loeb Investors Co. IX Common Stock 2014-08-15 4 S 0 18010 9.8894 D 1074651 I By Trust Common Stock 2014-08-19 4 S 0 45000 9.7155 D 766520 I By Loeb Holding Corporation Common Stock 2014-08-19 4 S 0 5000 9.7155 D 34764 I By Loeb Investors Co. IX Common Stock 5021 I By Spouse Common Stock 28041 D The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $9.3 to $9.385, inclusive. The reporting person undertakes to provide to Dyax Corp., any security holder of Dyax Corp., or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote 1. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $9.80 to $10.04, inclusive. The reporting person undertakes to provide to Dyax Corp., any security holder of Dyax Corp., or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote 2. The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $9.25 to $9.83, inclusive. The reporting person undertakes to provide to Dyax Corp., any security holder of Dyax Corp., or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote 3. The reporting person is the Chairman, Chief Executive Officer, and also beneficial owner of a majority of the voting stock of Loeb Holding Corporation. The reporting person disclaims beneficial ownership of thse shares except to the extent of his pecuniary interest therein. The reporting person is the Managing Partner of Loeb Investors Co. IX. The reporting person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest therein. Shares held in trust, of which the reporting person is the trustee, for the benefit of the reporting person's brother's children, the reporting person's children, the reporting person's sister-in-law, and the reporting person. /s/ Stacie S. Aarestad, as attorney-in-fact 2014-08-21