A blunder is a stupid and careless mistake. History is filled with well-known blunders, such as Excite not buying Google and Blockbuster Video not buying Netflix. In 1962, record label Decca was looking to sign an up-and-coming band. They auditioned two young bands at their studios in London, deciding to sign Brian Poole and the Tremeloes. The band they rejected? You might have heard of The Beatles. Blunders you make as a plan sponsor won’t make the history books, they will just cause you headaches and possibly cause you financial harm. This article is all about the blunders to avoid now as a 401(k) plan sponsor.