Glossary platform
Sharp Bookmaker
In short: A sportsbook that accepts large bets from professional bettors, adjusts lines quickly based on action, charges low vig (2–3%), and rarely limits winning customers. Pinnacle, Circa Sports, and Bookmaker.eu are leading examples.
Also known as: sharp book, wiseguy book, market-maker
Sharp books are the closest thing the betting market has to an efficient market. Their closing lines are the standard reference for measuring true probability and identifying mispriced lines elsewhere.