CONCORD, N.H. (AP) – A federal jury convicted four former Enterasys executives on securities fraud and conspiracy charges Tuesday, but jurors were unable to reach a verdict on five charges against the company’s former chief operating officer, Jerry Shanahan.

Shanahan, the only defendant who was not a certified public accountant, was acquitted on one count of securities fraud. The jury returned no verdict on a wire fraud charge, three other securities fraud charges and a conspiracy charge.

Shanahan, who is from Ireland, will remain free on bail while the U.S. Attorney’s office decides whether to retry him.

The verdict came mid-afternoon, after more than a week of jury deliberations. The other four executives were convicted on 27 of 39 conspiracy, securities and wire fraud charges against them.

Former chief financial officer Robert Gagalis, 49, of Rye, had faced the most charges. Also convicted were former vice president Bruce Kay, 53, of Yarmouth, Maine; former accountant Robert Barber, 53, of Durham; and David Boey, 51, of Atlanta, who worked in the company’s Singapore office.

The former executives are accused of scheming to inflate company revenues in the quarter ending Sept. 1, 2001. The charges related to sales contracts, investments and revenue the computer networking company reported during and immediately after the company’s spinoff from Cabletron Systems Inc., which was co-founded by former Gov. Craig Benson.