Mathew Martoma was living the American dream — with a $2 million country club estate in Boca Raton, Fla., a seemingly successful finance career and loads of cash to spend.

But the dream was shattered yesterday when FBI agents knocked on his door at 6:30 a.m. and arrested him for helping pull off the most lucrative insider-trading haul ever, according to prosecutors..

Martoma, 38, reaped a $9.3 million bonus from his employer, SAC Capital Advisors, in 2008 — at the ripe old age of 34.

In 2010, Martoma and his pediatrician wife, Rosemary, bought the five-bedroom, six-and-a-half bath Mediterranean-style house — complete with elevator and in-ground pool.

That same year, the couple, who married in 2003, launched a family foundation funded with $1 million, records show.

Manhattan US Attorney Preet Bharara, the Securities and Exchange Commission and the FBI said Martoma helped SAC and its CR Instrinsic unit make a whopping $276 million in profits and losses avoided based on trades in two pharmaceutical companies.

Martoma was fired from SAC following his jackpot pharma winnings, prosecutors said.

According to a 2010 e-mail suggesting he be let go, an officer at SAC allegedly called Martoma a “one-trick pony,” officials said yesterday.

Martoma more recently worked at hedge fund Sirios Capital in Boston. Sirios declined to comment.