A well-received initial public offering by GoPro ( GPRO ) also contributed to positive market momentum, with shares of the wearable camera-maker climbing over 30% during its first day of public trading. Stocks tumbled heading out of the gate Thursday after hawkish comments by St. Louis Fed President James Bullard boosted market concerns that followed weak data on household spending and income. The Commerce Department Thursday also reported the Federal Reserve's preferred inflation measure, recording a seasonally adjusted 0.2% rise in the core personal consumption expenditure deflator, in-line with expectations.