Stocks moved higher after energy ministers from Russia and Saudi Arabia called for an extension to an oil production cap agreement. The energy sector drove the bulk of gains on Wall Street to begin the week. Homebuilder sentiment improved in May as confidence in demand remained strong. The National Association of Home Builders said "existing home inventory remains tight" meaning that demand for new construction should continue. Buffalo Wild Wings  (BWLD) increased after analysts at Deutsche Bank upgraded the stock to buy from hold. The firm said cost-cutting initiatives could lessen the impact of potential headwinds to sales and profit. Cybersecurity companies were on the upswing after a massive cyberattack crippled computer networks across Europe. Symantec (SYMC - Get Report) , FireEye (FEYE - Get Report) , and Palo Alto Networks (PANW - Get Report) each moved higher.