ARKANSAS BEST CORP DEL

CUSIP: 040790107 Class: COM

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

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

Q3 2013
Shares 642,900 Value ($000) $16,503 Avg Close — Range —
Q2 2013
Shares 936,800 Value ($000) $21,500 Avg Close — Range —