SEATTLE GENETICS INC

CUSIP: 812578102 Class: COM

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

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

Q3 2020
Shares 5,750,582 Value ($000) $1,125,331 Avg Close — Range —
Q2 2020
Shares 6,884,432 Value ($000) $1,169,803 Avg Close — Range —
Q1 2020
Shares 7,476,972 Value ($000) $862,693 Avg Close — Range —
Q4 2019
Shares 10,951,717 Value ($000) $1,251,343 Avg Close — Range —
Q3 2019
Shares 13,229,940 Value ($000) $1,129,837 Avg Close — Range —
Q2 2019
Shares 14,163,825 Value ($000) $980,278 Avg Close — Range —
Q1 2019
Shares 14,231,300 Value ($000) $1,042,300 Avg Close — Range —
Q4 2018
Shares 14,135,200 Value ($000) $800,900 Avg Close — Range —
Q3 2018
Shares 14,456,100 Value ($000) $1,114,854 Avg Close — Range —
Q2 2018
Shares 14,474,000 Value ($000) $960,929 Avg Close — Range —
Q1 2018
Shares 14,440,582 Value ($000) $755,820 Avg Close — Range —
Q4 2017
Shares 12,714,100 Value ($000) $680,204 Avg Close — Range —
Q3 2017
Shares 12,779,425 Value ($000) $695,329 Avg Close — Range —
Q2 2017
Shares 12,958,975 Value ($000) $670,497 Avg Close — Range —
Q1 2017
Shares 13,182,312 Value ($000) $828,640 Avg Close — Range —
Q4 2016
Shares 13,230,162 Value ($000) $698,156 Avg Close — Range —
Q3 2016
Shares 13,420,237 Value ($000) $724,827 Avg Close — Range —
Q2 2016
Shares 13,514,712 Value ($000) $546,130 Avg Close — Range —
Q1 2016
Shares 13,589,187 Value ($000) $476,845 Avg Close — Range —
Q4 2015
Shares 12,882,175 Value ($000) $578,152 Avg Close — Range —
Q3 2015
Shares 12,865,950 Value ($000) $496,111 Avg Close — Range —
Q2 2015
Shares 11,899,100 Value ($000) $575,916 Avg Close — Range —
Q1 2015
Shares 11,836,575 Value ($000) $418,423 Avg Close — Range —
Q4 2014
Shares 11,178,050 Value ($000) $359,151 Avg Close — Range —
Q3 2014
Shares 10,954,900 Value ($000) $407,303 Avg Close — Range —
Q2 2014
Shares 10,895,800 Value ($000) $416,764 Avg Close — Range —
Q1 2014
Shares 11,007,005 Value ($000) $501,479 Avg Close — Range —
Q4 2013
Shares 10,953,400 Value ($000) $436,931 Avg Close — Range —
Q3 2013
Shares 10,887,000 Value ($000) $477,177 Avg Close — Range —
Q2 2013
Shares 10,887,919 Value ($000) $342,534 Avg Close — Range —