Looked at some of the owners of championship clubs, what businesses they are in etc. club status at different levels in English football leagues.

Norwich City - Owners man & wife team of Delia Smith, husband Michael Wynn Jones.
4th September 2008, they put £2m into the club.
Last 3 years running accounts show a £250,000 loan outstanding to Smith & Jones, it seems the parachute payments from their premier league exploits, & sponsorship have helped the club.

Brentford - Owner Matthew Benham, successful in the world of online gambling.

Watford - Owner Gino Pozzo, Sports investment group.
Family own Italian side Udinese, Owned Spanish football club Granada, but sold it in 2016

Swansea City - Majority shareholders Steve Kaplan & Jason Levien, they bought a major stake of 68% in 2016, other investments in major league soccer team DC United, & basketball franchise Memphis Grizzlies, Kaplan fronts Oaktree Capital Investment, which provided the bulk of the money, for the pairs Liberty Stadium takeover.
Funny twist is that, there are 25 other investors, including Hollywood actress Mindy Kaling, among investors are a eye surgeon, property investors, a film maker, orthopedic surgeon, & other investment funds.
Landon Donavan , a former Everton footballer, works has a advisor to Levien & Kaplan, the consortium is called Swansea Football LLC.

Reading - Owners Dai Yongge & Dai Xiu - Madejski Stadium M Holdings Plc - Chinese investmet company.

AFC Bournemouth - Owner Maxim Victorovich Demin, Russian businessman.

Barnsley - Main owner Chien Lee ( Billy Beane, Paul Conway, Neerav Parekh ) Jean & James Cryne 20%
Ground owned 50% / 50% by Barnsley Council & Cryne's Family.

Cardiff City - Owners Tan Family, Malaysian / Chinese business, club business Cardiff City F.C. Holding Ltd

Middlesbrough - Owner Steve Gibson, Business Bulkhaul Ltd

Stoke City - Owners The Coates Family - Business Bet365

Bristol City - Owner Stephen Lansdown - Business Financial Services

Millwall - Owner Boston based John G Berylson - Chairman of Chestnut Hill Ventures LLC - Financial

12 teams, not many English owners, to check other 12 teams yet.