It was another up-and-down week with the bulls and bears fighting for dominance and sparking market volatility.
Both sides agreed on one thing, though: oil remained in the driver's seat.
Crude determined market direction for much of the week, moving up from Monday after Venezuela, Saudi Arabia and Qatar, members of the Organization of Petroleum Exporting Countries, agreed to further negotiations with Russia next month over a production freeze.
Further gains in oil were curbed by Saudi Arabian Oil Minister Ali Al-Naimi's dismissal of production cuts. He argued instead that maintaining output will enable the market to rebalance over time as demand improves.
"Oil continues to impact investor sentiment and broad market returns," said Terry Sandven, chief equity strategist at U.S. Bank. "Continued supply/imbalance, implications of Iran increasing production and adding to global supplies, potential production agreement between key players (such as Saudi Arabia and Russia) are among factors adding to equity volatility and uncertainty."
Oil prices touched 13-year lows earlier this year on record production levels, global oversupply, and signs of weaker demand. West Texas Intermediate crude ended the week more than 3% higher, paring its year-to-date drop to 16%.
Oil's weekly rise drove equities higher, pushing the S&P 500 to close with weekly gains for only the fourth time this year. For the week, the S&P 500 added 1.6%, the Dow Jones Industrial Average increased 1.5%, and the Nasdaq rose 1.9%.
For the year, the S&P 500 has tumbled 4.7%. The benchmark index is now down 8.7% from its 52-week high, out of correction territory.
Retail earnings were in focus as the reporting season continued to wind down. Around 95% of S&P 500 companies have reported so far and headline earnings are likely to be down 3.2% overall, the third straight quarter of declines. The bulk of the blame can be placed on energy companies, which have bled profitability as crude oil prices slumped.
The retail sector showcased a mixed bag. Home-improvement retailer Home Depot (HD) reported an 8.9% increase in U.S. same-store sales as the do-it-yourself market remained robust. Meanwhile, competitor Lowe's (LOW) sank after profit slumped to a penny a share as charges mounted over its exit from the Australian market. Department store chains Macy's (M) , Kohl's (KSS) , Target (TGT) and J.C. Penney (JCP) all surpassed quarterly estimates on stronger holiday sales.
Federal Reserve chatter kept traders on their toes throughout the week. The central bank's rate hike plans remain a mystery after Fed Vice Chairman Stanley Fischer reiterated that members "do not know" what the exact timeline looks like, emphasizing a continued focus on incoming data in a speech on Tuesday night.
Fischer also commented on recent market volatility. "We have seen similar periods of volatility in recent years -- including in the second half of 2011 -- that have left little visible imprint on the economy, and it is still early to judge the ramifications of the increased market volatility of the first seven weeks of 2016," he noted.