MSP Pie lists 16 providers offering Fortinet in Sydney. Some background: fortinet is a technology vendor whose products some providers specialise in deploying and managing. Comparing providers here usually means checking their actual partner tier or certification level with this vendor, not just that they mention it.
The most common specialisms across the list in Sydney are Cyber security (10), Essential Eight (7), Managed IT and helpdesk (6), Microsoft Azure (5), Cloud and hosting (4). In total, 39 distinct specialisms are represented across this group of providers in Sydney. Founding years among them range from 1988 to 2016. They are based across 6 different suburbs: Sydney, Northcote, North Sydney, Surry Hills, Stafford, Port Park Port Melbourne. Of the 16, 10 have an office in Sydney -- the others cover it as a service area. 9 of the 16 operate from more than one office across Australia.