Pro-Tect's director of operations Peter Boatman died in the autumn in a suspected suicide attempt.
The force said it would be up to Pro-Tect Systems to reapply for a licence.
Earlier this week it emerged supplier Pro-Tect breached its licence by supplying X12 Tasers direct to police.
Former police officer Peter Boatman, of the Daventry firm Pro-Tect, was found dead on Friday morning, his business partner said.
Northamptonshire Police found firearms offences were committed by Pro-Tect Systems of Daventry.
The 57-year-old is understood to have killed himself three days after the Home Office revoked Pro-Tect Systems' licence to import and sell Tasers.
"Northamptonshire Police have concluded their investigation into the supply of X12 Taser guns and XREP ammunitions by Daventry-based Pro-Tect Systems Limited, " Supt Sean Bell said.
Peter Boatman, a former policeman who was director of operations for Pro-Tect Systems, was found dead at his home in Reynard Way, Northampton, on 1 October.
The Home Affairs Committee's report says it was "concerned" that following the revocation of Pro-Tect Systems Ltd's licence police forces "were close to running out of Taser cartridges".
BBC: Taser contract criticised by Home Affairs Committee MPs
Home Office official Graham Widdecombe admitted to MPs that the government "understood the concerns of MPs" over the granting of a licence to a company with a similar structure to Pro-Tect.
Pro-Tect Systems is now being replaced by start-up firm Tactical Safety Responses (TSR), which is based in the same area and will use some of the same staff as its Northampton-based predecessor.
Liberal Democrat Julian Huppert criticised Kevin Coles from Pro-Tect Systems, during an evidence session with the Home Affairs Committee on 7 December 2010 on the use of Tasers by police forces in England and Wales.
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