John Smith, 41, from Connah's Quay, Deeside, staged seven collisions in Chester allowing more than 200 people to make false personal injury claims.
Ten other people were also found guilty at Manchester Crown Court for their part in the plot which police say could have totalled more than £1m.
Smith, who denied conspiracy to commit fraud, will be sentenced on 23 April.
All the collisions - six in Chester and a seventh on the A41 in Eastham - happened between 2010 and 2012 and followed a similar pattern, said police.
A car would collide with the side of a bus causing minimal impact but resulting in multiple personal injury claims from the passengers on board.
In total, 218 claims for claims were made for soft tissue damage and whiplash injuries, 177 through accident management firm Swift Accident Solutions where Smith was managing director.
The scam was unearthed when First Group became suspicious about the number of collisions involving its buses.
Smith, who was paid an average of £900 for each claimant he introduced to a solicitor, made a total of £159,000.
But Det Insp Simon Lonsdale of Cheshire Police said the scale of the intended fraud was much larger.
"Had all of the false claims created by Smith and his associates been successful we believe that the total cost would have been more than £1m, which would have been paid for by law-abiding citizens through their car insurance policies."
Ten defendants who denied conspiracy to commit fraud but were also convicted were:
Five other defendants had previously pleaded guilty to the same charge for their role in the fraud:
Two men on trial were cleared of conspiracy to commit fraud.

Police said that someone opened fire from a passing car and witnesses spoke of up to a dozen shots being fired close to the main police station.
"Nothing is known about the culprits yet but we can guess that this involves local crime gangs," investigators told German media.
The suspects fled and the area was quickly cordoned off.
The shots were fired in Friedrich-Stoltze Square, a busy area of bars and cafes, as local people enjoyed the Ascension Day holiday in the sunshine.

8 February 2017 Last updated at 11:58 GMT
An accident in Dumfries and Galloway has highlighted the perils of delivering huge wind turbine parts on country roads.
Two such deliveries recently have had very different outcomes.
One driver managed to successfully navigate Bargrennan Bridge, near Newton Stewart, in November.
But a delivery on the A713 on Tuesday saw a lorry and its giant cargo end up in a ditch.
The ringleader of a gang who ran a "cash-for-crash" scam involving bus passengers has been convicted of fraud.
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At least three people were wounded, two seriously, when shots were fired in the German city of Frankfurt on Thursday.
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Footage of Bargrennan Bridge: Dabby McCreadie