For the year-end tables of leading sires in various categories of APEX ratings, which measure the frequency that stallions sire runners who meet certain earnings percentage thresholds, sires have to have had 200 or more year-starters going back as far as seven seasons (a horse is counted as one ‘year-starter’ each year it races, as with the average earnings index). The top category is ‘A Runners’, which measures the top 2% of earners in each jurisdiction each year.
On Jan. 14, 2016, we published the leading sires by A Runner Index for the years 2009-15 (Thoroughbred Daily News, Jan. 14, 2016). The top three sires were Galileo (4.09 A Runner Index), Into Mischief (4.07), and War Front (3.89).
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