By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market ended a volatile session on Wednesday slightly higher with the Dow Jones Industrial Average closing at a record level for the first time this year.

The benchmark S&P 500 and blue-chip index notched modest gains for the month. Stocks swung in the aftermath of the Federal Open Market Committee announcement, which came in as expected.

The Fed announced it would reduce the monthly bond-buying program by another $10 billion to $45 billion and kept the key rate unchanged at zero, looking past surprisingly grim growth in the first quarter.

The Dow Jones Industrial Average (DJI) closed at a record level after rising 45.47 points, or 0.3% to 16,580.84. The blue-chip index gained 0.75% over the past month.

The S&P 500 (SPX) ended the day 5.62 points, or 0.3%, higher at 1,883.95 and rose 0.6% over the past month. The benchmark index is less than 10 points off its record closing level.

The Nasdaq Composite (RIXF) added 11 points, or 0.3% to 4,114.56. The selloff of biotech and Internet stocks during April left the index with a 2% loss over the month.

Read the recap of MarketWatch's live blog of today's stock-market action.

Bernie Williams, chief investment officer at USAA Investment Solutions, said further tapering, which will eventually run its course, is good because it means the economy is improving.

"We expect the economy to strengthen in the second half of the year and instead of a summer 'soft patch' we think we will see a rebound which will help markets," he added.

Growth in the U.S. economy nearly ground to a halt in the first quarter, a bout of weakness spurred by one of the worst winters in years. Gross domestic product rose at an annual rate of just 0.1% from January through the end of March, the weakest performance in three years, according to a preliminary estimate by the Commerce Department. Economists surveyed by MarketWatch had forecast growth to slow to a seasonally adjusted 1% from a 2.6% clip in the final three months of 2013.

Private-sector hiring picked up in April, with employers adding the most jobs in five months, according to data released Wednesday morning.

Chicago PMI rebounded in April to the fastest pace in six months, according to the Chicago business barometer released Wednesday.

Twitter, eBay sell off after results

Twitter (TWTR) shares sold off and closed 8.6% lower after the microblogging company beat revenue forecasts, but disappointed with its average monthly users tally for end-March.

EBay (EBAY) shares fell 5%, after its first-quarter earnings topped expectations but its outlook was viewed as lackluster.

Facebook, Inc (FB) shares rose 2.8% after the social-media site introduced a new feature that allows users to log in anonymously in order to try out new apps. Facebook Chief Executive Mark Zuckerberg said the feature is about "giving people more power and control."

Shares of Panera Bread Co. (PNRA) fell 6.3% after the company's second-quarter outlook fell short of Wall Street estimates.

WellPoint Inc. (WLP) reported adjusted first-quarter earnings above expectations with EPS coming in at $2.30, compared with estimates of $2.10. Shares rose 5.6%.

Time Warner Inc. (TWX)reported a higher profit, saying blockbuster hit "The Lego Movie" helped the company get off to a "strong start" for 2014. Shares added 2.7%.

Shares of Pepco Holdings Inc. (POM) surged 17% to $26.77 after Exelon Corp. (EXC) said it would buy the utility firm in an all-cash deal for $27.25 a share, valuing the company at about $6.83 billion.

Energizer (ENR) shares jumped 14% after the firm said it would split into two companies, one focused on household products and the other on personal care. The split is expected to be completed in 2015.

In overseas markets, European stocks slipped. In Asia, the Hong Kong Hang Seng Index fell 1.4% on disappointing bank earnings as a May 1 holiday looms.

Crude-oil (CLM4) prices were under pressure. Gold was also lower, and the dollar remained down against several rivals.

More must-reads from MarketWatch:

Crashy Marc Faber: It's too late to buy U.S. stocks now

Why traders are watching the Russell 2000 and the small-cap index's ETF this week

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