FTSE 100 vs FTSE 250
The company profiles published on this site cover the FTSE 100 in full, plus the largest S&P 500 constituents. Behind the scenes, OSIC is also running the same passive method — DNS, hosting attribution, Companies House, subdomain discovery — across the FTSE 250, purely to answer one question: does the infrastructure picture actually look different once you're not looking at the very largest public companies? The FTSE 250 figures below are aggregate only; no individual FTSE 250 profile is published on this site.
This dataset is still filling in — the FTSE 250 numbers below will firm up as background collection progresses, the same way the FTSE 100 baseline did.
FTSE 100 public baseline
Top sectors
- Professional & Scientific Services — 44
- Financial Services — 24
- Manufacturing — 7
- Mining & Quarrying — 4
- Technology & Communications — 4
FTSE 250 aggregate only
Method is identical across both tiers — the same passive DNS, RDAP, Certificate Transparency and Companies House collection described in how the passive method works. "Median" rather than average throughout, so one unusually large or thin company doesn't set the headline number.
Want the FTSE 250, company by company?
Individual FTSE 250 profiles — the same depth as every FTSE 100 page on this site — aren't published here. They're available on request while OSIC's paid tiers are still taking shape.
Get in touch for early access