The Citation 501, 551, CJs (525s), and the Beech Premier I. Most, if not all, of the "microjets" in development (Citation Mustang, Adam A700, Eclipse 500, etc.) will be single-pilot, but nothing larger than that is, to the best of my knowledge.
Remember that a single-pilot type certificate or waiver is a long way from insurance approval, which is usually far more stringent. Many one-pilot aircraft are flown with two pilots for that very reason.
Larger aircraft (such as the Gulfstream) are sufficiently workload-intensive and complex that you really WANT two pilots up front.
FL270