Q. Companies: Preferred shares of stock

Go to the following websites:

• preferredstockonline.com
• ADR Directory
• CNBC stock screener
• Google Finance stock screener

Also Thomson One:

• Click on the Screening & Analysis.
• Click on Deals & League Tables.
• Click on the Equity folder.
• Click on Quick Search.
• Search in Security Type (Transaction Criteria section) for preferred.

Note: this resource only works in Internet Explorer.

Quantum Online lists preferred stocks, online, and has free registration. Also, see their explanatory material about finding tickers for preferred stock, here.