Authorities from several local and state law enforcement agencies, along with the Federal Bureau of Investigation, are focusing search efforts on a sprawling farm in Bucks County, about 40 miles north of Philadelphia.
He was taken into custody on an unrelated gun charge, with bail set at $1-million.
Who are the men who disappeared? .
His family owns the property where investigators are searching for the men. But Sturgis' father "has said that his son and Meo are longtime friends who work in construction for him" and that "Finocchiaro is a mutual friend of theirs", according to The Associated Press.
Finocchiaro was last seen getting into a vehicle on Hampton Drive near his home in Langhorne on Friday, Middletown Township Police reported. The others are Jimi Tar Patrick, 19, of Newtown Township; Mark Sturgis, 22, of Pennsburg, Montgomery County; and Dean Finocchiaro, 19, of Middletown.
"We have a ton of leads and we've been able to eliminate a lot of information that's helping us narrow our focus, but we have so much more to do", he said later.
Weintraub is expected to update the investigation at a 3:30 p.m. news conference.
The man's parents, Antonio (46) and Sandra DiNardo (47), have been subpoenaed to appear before a county grand jury on Thursday, and have had their mobile phones seized, Fox News reports.
Sources tell USA media that a ping from a mobile phone belonging to one of the men led investigators to the farmland property.
If DiNardo goes anywhere besides his Bensalem home he must let prosecutors know within 48 hours, Weintraub said. According to the arrest report, DiNardo suffers from mental illness and had been involuntarily committed to a mental institution at that time. When Weintraub was asked if officials believe foul play is involved, he said it did seem so.
Weintraub said Tuesday that any tips from the public could help in their investigation. The Bucks County district attorney's office authorized police to reinstate and refile charges in the case in June, leading to Monday's arrest. A district judge dismissed the charge in May, but the district attorney authorized for it to be refiled on Monday.
On Tuesday, Bucks County District Attorney Matthew D. Weintraub confirmed that 20-year-old Cosmo Dinardo had been identified of interest to the case.
Foul play is suspected in the disappearance of the men, Weintraub said Monday.
Finocchiario and Patrick were reported missing last week, while Meo and Sturgis were reported missing on Sunday.
Police have not said if the missing men are in any danger.
When asked whether he thought the missing men were alive, the district attorney replied, "I hope and I pray that would be the best outcome".
He was last seen around Routes 202 and 263 near Doylestown on Friday, she wrote.
Weintraub said Tuesday that hundreds of law enforcement officials - including members of the state police, U.S. Marshals and the Federal Bureau of Investigation - are involved in the search for the four missing men.