Sentencing in the case is scheduled for 6 August and the brothers could face up to life in prison.
In closing arguments, Assistant US Attorney Andrew Jones said the brothers committed crimes without remorse and with “callousness” and “a perverse sense of pride”.
Lawyers for the brothers had argued they were womanisers – but not rapists.
“They’re not drugging them, they’re not raping them, but they’re certainly pursuing them,” said Marc Agnifilo, a lawyer for Oren Alexander. Agnifilo had previously represented rapper Sean “Diddy” Combs in his sex trafficking trial last year.
During the five-week trial, 11 women – including several who said they were minors at the time of the incidents – testified against the brothers, alleging they gave them gifts and flew them to locations and parties where they fed them drugs before assaulting them.
Prosecutors said the brothers “surreptitiously” put drugs in women’s drinks, and told jurors that they “physically restrained and held down their victims during the rapes and sexual assaults and ignored screams and explicit requests to stop”.
Jurors were shown a video during the trial of Oren Alexander allegedly raping a drugged 17-year-old at his Manhattan apartment in 2009.
During the trial, a new allegation surfaced as part of a separate lawsuit, when reality television star and top real estate agent Tracy Tutor accused Oren Alexander of drugging and sexually assaulting her in New York City in 2024.
A lawyer for Alexander called the civil suit a “demonstrably false lawsuit for maximum media impact”.
Tal and Oren Alexander were once prominent real-estate agents, working for property giant Douglas Elliman and listing homes for celebrities including Liam Gallagher, Lindsay Lohan, Kim Kardashian and Kanye West. In 2022, they founded their own New York-based firm called Official. Alon worked at the family’s private security firm, Kent Security.
The BBC has contacted Agnifilo for comment on the verdict.