DYAX CORP

CUSIP: 26746E103 Class: CMN

PRIMECAP MANAGEMENT CO/CA/'s Holding History (CIK: 0000763212)

Note: Option positions (PUT/CALL) are excluded.

Q4 2015
Shares 10,482,860 Value ($000) $394,365 Avg Close — Range —
Q3 2015
Shares 10,617,860 Value ($000) $202,695 Avg Close — Range —
Q2 2015
Shares 10,617,860 Value ($000) $281,373 Avg Close — Range —
Q1 2015
Shares 10,632,860 Value ($000) $178,100 Avg Close — Range —
Q4 2014
Shares 10,869,860 Value ($000) $152,830 Avg Close — Range —
Q3 2014
Shares 10,884,960 Value ($000) $110,156 Avg Close — Range —
Q2 2014
Shares 11,129,830 Value ($000) $106,846 Avg Close — Range —
Q1 2014
Shares 11,806,990 Value ($000) $106,027 Avg Close — Range —
Q4 2013
Shares 11,806,990 Value ($000) $88,907 Avg Close — Range —
Q3 2013
Shares 10,906,990 Value ($000) $74,822 Avg Close — Range —
Q2 2013
Shares 10,906,810 Value ($000) $37,738 Avg Close — Range —