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The 2026 Kentucky Derby features a deep and competitive field, but So Happy has become one of the more talked-about contenders ahead of the race. The colt enters off a win in the Santa Anita Derby and brings a combination of recent success and a story tied closely to the people behind him.

According to BloodHorse, So Happy’s path to the Derby is closely connected to breeder Leverett Miller and his late wife, Linda Miller.

So Happy’s Background Reflects Decades of Work by the Miller Family

So Happy was bred by Leverett Miller, 94, who ran T-Square Stud in Florida with his wife, Linda Miller, for 25 years. The couple built their program around producing durable racehorses rather than focusing on short-term trends.

Leverett Miller spoke about his late wife, telling BloodHorse, “I can’t tell you what it means. There are no words.”

Linda Miller died in 2021 after battling cancer, but she played a major role in developing the bloodlines that eventually produced So Happy. She became deeply involved in the farm over the years, even though she did not have much experience with horses early on.

Their daughter, Penelope Miller, explained how her mother grew into that role.

“Mom went from not knowing much about horses to delivering foals to supervising her own breeding program,” Penelope said. “She truly learned to love it.”

The Millers’ breeding approach focused on consistency. Penelope added, “One of the things I have always admired greatly about my parents’ breeding program is that they have never bred to produce anything other than a sound racehorse.”

That long-term approach helped produce several successful horses over the years and eventually led to So Happy.

“She would love the name So Happy because she named everything ‘So,'” Leverett noted. “And they were pretty good horses.”

So Happy Enters Kentucky Derby Off Santa Anita Derby Win

So Happy comes into the Kentucky Derby with a 3-for-4 record and earnings of $480,000. The colt is trained by Mark Glatt and ridden by Hall of Fame jockey Mike Smith, who has been aboard in all four races.

His most recent start was a win in the Santa Anita Derby, where he defeated Potente by 2¾ lengths. That performance helped move him into the group of serious contenders heading into Churchill Downs.

So Happy began his career with a maiden win at Del Mar in November 2025. He followed that with a stakes win at Santa Anita in January 2026 before finishing third in the San Felipe Stakes. He then returned to win again in April.

His pedigree includes sire Runhappy, a champion sprinter, and dam So Cunning, who adds distance influence through Blame bloodlines. While Runhappy’s offspring typically perform best at shorter distances, So Happy has shown the ability to compete in longer races.

There is still some uncertainty about how he will handle the full Derby distance, but his recent results suggest he could remain competitive late in the race.

Trainer Mark Glatt is also dealing with personal loss after his wife, Dena, died earlier this year. That connection has added another layer to So Happy’s story.

Penelope Miller said, “This horse has, I think, carried a lot more than a jockey in his races when you consider what the Glatt family has been through.”

How to Watch the 2026 Kentucky Derby

The 152nd Kentucky Derby will be held at Churchill Downs in Louisville, Kentucky. The race features 20 three-year-old horses competing over 1¼ miles for a $5 million purse.

Coverage begins at 2:30 p.m. ET on NBC and USA Network, with streaming available on Peacock. Post time is set for 6:57 p.m. ET.

As of Saturday morning, CBS was listing So Happy’s odds at 6-1, placing him among the top group of contenders in what remains a wide-open race.