The post His Company Joined the S&P 500. His 401(k) Started Buying More of It Without Asking Him. appeared first on 24/7 Wall St.. Picture an engineer at a public company opening his 401(k) after learning that his employer is joining the S&P 500. He already receives restricted stock units (RSUs), buys discounted shares through an employee stock purchase plan (ESPP) and depends on the company for his paycheck. Now the S&P 500 index fund in his re…