Contact details taken from the vendor's own site on 26 August 2026. Nothing here is guessed; a blank field means we did not find one.
OnixS is listed in the Buyside Fintech directory with 1 product. The company is based in London, United Kingdom. Its products are listed under fix connectivity. That product is OnixS FIX Engine SDKs. Every fact on this page carries the source we read and the date we checked it, and the profile has not been claimed by OnixS. Practitioners at firms that use OnixS can review it here, and the company may reply to a review but may not write one.
How OnixS describes itself
OnixS Direct Market Access (DMA) SDKs: FIX Engine, FIX/FAST and SBE encoder/decoders, Market Data Handlers, Order Entry, Trade Capture & Drop Copy SDKs
OnixS’s own website, read 2026-08-30
Their words, not ours. We publish it so you can see how a company positions itself; it is not an assessment and nothing in it has been checked.
OnixS products
OnixS FIX Engine SDKs
Ultra-low-latency FIX protocol SDKs for .NET, C++ and Java, sold alongside venue-specific directConnect market data and order entry kits.
Confirmed on the vendor's own site · source · 2026-10-11
What practitioners say
Questions and notes