The APEX (Annual Progeny Earnings index) method of rating stallions uses many of the same basic principles as the average-earnings index, but rates a stallion's consistency at siring high-level performers, so that one super-earner doesn't unrealistically skew a sire's average-earnings index. There are many ways of looking at the statistic–each sire has 17 different APEX ratings–including progeny performance at different ages, by different class bands and in different regions. Stallions can also be measured against only those whose crops hit the track in the same year. Each week, beginning this week, the TDN will offer a different APEX snapshot with a brief analysis by APEX's author, Bill Oppenheim.

• February 20, 2013 - Top Damsires
• February 12, 2013 - Lifetime Achievements: Top 50 Sires by Percentage Winners
• January 30, 2013 - The Galileo Show: Leading Sires of 2012 Runners
• January 23, 2013 - Top of the Crop: F2008 & F2009 Sires
• January 16, 2013 - The Names You Know: Apex Earnings Threshold
• January 10, 2013 - Deep Impact Tops Apex Sires
• August 22, 2012 - Deep Impact, Galileo Top '12 Apex Lists
• August 15, 2012 - Speightstown for Consistency: Top 50 Sires by ABC Runner Index 2006-12
• August 9, 2012 - A.P. Indy as Top Apex Sire
• July 12, 2012 - Uptick: Yearling Averages for FTK July Sires
• February 1, 2012 - Hidden Gems: Sleeper Sires for 2012
• January 25, 2012 - Apex Leader Boards
• January 18, 2012 - Leading Apex Sires: 50 Sires by Number of A Runners
• January 12, 2012 - Top 50 Sires by Apex A Runner Index
• January 4, 2012 - Distorted Humor: Young Kentucky Stallions 2010-13
• August 24, 2011 - Who's Hot Now: Top Sires of New 2011 Runners
• August 17, 2011 - Top Young Sires: Top F2006 Sires
• August 11, 2011 - Mo' Better: Top 50 Sires by A Index
• July 14, 2011 - Fasig-Tipton July Sires
• January 19, 2011 - Quality in Quantity: Top Sires by No. of A Runners
• January 13, 2011 - A.P. Indy: To 75 Sires by A Runner Index
• July 7, 2010 - The Yearling Sales: Leading First Crop Sires by Earnings
• February 10, 2010 - Value Buys: APEX Sires Under $20,000
• August 27, 2009 - Leading Sires, First Foals 1996-2005
• August 5, 2009 - A.P. Indy, Galileo Top Midyear APEX Ratings
• February 4, 2009 - The Rewards of Consistency (APEX Toppers -- ABC Runners; F1996-2005 Sires -- The New World Top 30)
• January 28, 2009 - The New Old Guard (1st Foals 1996-2005, The New World Top 10 or 12; F1996-F2005 Sires, The Second Fifteen)
• January 21, 2009 - APEX Sires: Different Views (Top 50 Sires by ABC Runner Index; Top 50 F1996-F2005 Sires; APEX Thresholds 2002-08)
• January 15, 2009 - The Perfect Storm (Top 50 Sires by APEX A Runner Index 2002-2008)
• August 27, 2008 - Supermarket Time (KEESEP Book 1-2 Sires APEX Ratings)
• August 13, 2008 - Mid-Year APEX (Top 50 Sires [200+ Yr-Starters 2002-2008] by A Runner Index; Top 40 Sires F2000 & Later, 150+ Year-Starters, by A Runner Index; Top 20 F2004 Sires by A Runner Index)
• May 21, 2008 - End Of An Era (Storm Cat-Line Sires APEX)
• April 30, 2008 - Third-Crop Blues (Leading North American Third-Crop Sires with APEX Indices)
• March 12, 2008 - The Verdict: The New World Top 25 (Top 25 F1996-B2004 Sires)
• March 5, 2008 - Breaking Down the Stats (Top 50 Sires - 2YO, 3YO, & 4YO ABC Index , 2001-07)
• February 27, 2008 - The Six Percent Solution (Top 50 Sires & Top 50 Sires with 1st Foals 1996-2004 by Career Percentage of A Runners to Foals)
• February 20, 2008 - Blinded by the Light (Top 20 F2003 Sires; Top 20 F2004 Sires)
• February 13, 2008 - World Domination (Leading Sires of New A Runners 2007; Leading Damsires of New A Runners 2007)
• February 6, 2008 - Fight Overproduction: Breed a Racehorse (54 Recommended 'Good Value' APEX Sires; 2007 APEX Earnings Thresholds)
• January 30, 2008 - The New Top Sires (52 Sires F1996-F2004 with APEX A Runner Indexes of 2.00+)
• January 23, 2008 - A.P. King (Top 50 Sires by A Runner Index, 2001-2007; Selected British & Irish Stallions)
• December 4, 2007 - North American Sires With 10+ Year-Starters in Europe; Top 25 European A Runner Index
• October 20, 2007 - TOP 35 SIRES by APEX B RUNNER INDEX 2001-2007
• October 13, 2007 - TOP 25 SIRES BY 2YO ABC INDEX-Midyear 2007 ratings
• October 5, 2007 - TOP 30 SIRES WITH FIRST FOALS 1996-2004 BY A INDEX-Midyear 2007
• September 28, 2007 - LEADING SIRES BY A INDEX-Midyear 2007
• August 29, 2007 - The Modern Sire (Top 50 Sires by A Index, 1st Foals 1996-2004)
• August 22, 2007 - F2003 Sires: Florida Again (Top 25 F2003 Sires by A Runner Index)
• August 15, 2007 - Mid-Year APEX: The Elders (Top 50 Sires by A Runner Index 2001-2007; F2004 Sires)
• February 7, 2007 - Sunshine Stallions (Leading APEX Sires With First Foals 2003)
• January 31, 2007 - Here and Now (Top 25 APEX A Runner Index; First Foals '96, '97, '98, '99, '00, '01, '02)
• January 24, 2007 - The Top Drawer (Top 25 in 7 Key APEX Categories)
• January 17, 2007 - Rewards For Consistency (20 Consistent Sires to Consider, APEX ABC Index)
• January 10, 2007 - Top APEX Sires (Top 40 APEX A Runner Index 2000-06)
• December 27, 2006 - European Top Value Sires For 2007
• December 20, 2006 - North American Top Value Sires (Under $40,000)
• December 13, 2006 - Five Great Values in America; European Value Standouts
• August 30, 2006 - Movers & Shakers (Leading Mid-Year APEX Sires First Foals 2001)
• August 23, 2006 - Perspectives (Leading Mid-Year APEX Sires First Foals 2000)
• August 16, 2006 - The Young Guns (Leading Mid-Year APEX Sires First Foals '02 & '03)
• August 8, 2006 - The Crop Report (Leading Mid-Year APEX Sires)
• February 8, 2006 - Racehorse Sires (by APEX Ratings, stud fees below $50,000)
• February 1, 2006 - Young Sires: Count Those ABC's (First Foals '01 & '02)
• January 25, 2006 - Leading Lights (Top APEX Sires of 2005)
• August 10, 2005 - Dividing the Spoils (Leading Sires, APEX A Runner Index 1999-2005)
• March 2, 2005 - First Four-Year-Olds (APEX Ratings, First Foals 2001)
• February 9, 2005 - APEX Ratings: Twenty-Year Totals (Leading Sires 1983-2004)
• January 26, 2005 - Young Guns (First Foals 1997-2000)
• January 19, 2005 - APEX Key Indicators
• January 12, 2005 - The New Top 40 (Top 40 Sires, APEX A Runner Index 1998-2004)