By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- The U.S. stock market edged higher on Wednesday, adding to three days of gains and taking the S&P 500 to an intraday record.

Markets had a muted reaction to the fastest pace of private-sector hiring in three months in early trade. Investors await a report on factory orders for February, due at 10 a.m. Eastern Time.

The S&P 500 (SPX), after an indecisive start, inched higher and notched an intraday record. The benchmark index was up less than a point at 1,884.39.

The Dow Jones Industrial Average (DJI) gained 11 points, or 0.1%, to 16,544.13.

The Nasdaq Composite (RIXF) added 10 points, or 0.3%, to 4,279.31.

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In economic news, private-sector-employment gains picked up in March, with employers adding the most jobs in three months, and quicker hiring may be ahead, Automatic Data Processing Inc. reported Wednesday.

ADP said private-sector employers added 191,000 jobs last month, up from 178,000 in February. A prior estimate pegged February's increase at 139,000.

While some economists use ADP's number to get a feeling for the official non-farm payrolls data, it is not always a reliable indicator according to Ian Shepherdson, chief economist at Pantheon Macroeconomics.

"We no longer view ADP as a useful advance indicator of the official payroll numbers. Since ADP was revamped in October 2012 it has clearly tended to lag movements in the official numbers by a month. We still look for 250,000 jobs gain on Friday," wrote Shepherdson in an emailed comments.

Investors await a report on factory orders for February, due at 10 a.m. Eastern Time. Economists polled by MarketWatch forecast factory orders rose 1.3% in February, after a 0.7% drop in January.

Two Federal Reserve officials are due to speak on Wednesday. Atlanta Fed President Dennis Lockhart, who isn't a voting member of the central bank's policy committee, will speak about the economic outlook to the Miami Chamber of Commerce at 12:55 p.m. Eastern. St. Louis Fed President James Bullard, also not a voting member, will meet with reporters at 4 p.m. Eastern.

Among individual stocks, Monsanto Co. (MON), shares fell slightly after the agricultural company reported its second-quarter earnings. The company said its fiscal second-quarter earnings grew 13% thanks to continued strength in its soybean seed sales as well as improved margins. Results beat expectations.

Shares of MannKind Corp. (MNKD), which surged 100% in after-hour's trading on Tuesday, was up another 83% to $7.31 on news a Food and Drug Administration advisory panel recommended approval of the biopharmaceutical company's inhaled diabetes drug Afrezza.

General Motors Co. (GM.XX) rose 1% as Chief Executive Mary Barra returns to Capitol Hill to continue her testimony on the company's handling of a massive recall linked to an ignition defect. GM said on Tuesday that U.S. sales in March rose 4% to 256,047 vehicles.

Nomura analysts initiated coverage of GM on Wednesday with a reduce rating, alongside a neutral rating for Ford Motor Co. (F). "We believe increasing macroeconomic headwinds will affect Ford and GM's profitability negatively relative to very high expectations for a FY15 earnings-per-share recovery," said analyst Harald Hendrikse in a note.

Ford shares were 0.6% lower.

Shares of Intuitive Surgical Inc. (ISRG) rose 1.5% after surging 11% on Tuesday after the company said it received the go-ahead from the U.S. Food and Drug Administration for its da Vinci Xi Surgical System.

In overseas markets, the Stoxx Europe 600 index logged light gains as investors awaited U.S. data and Thursday's European Central Bank meeting. Asia stocks chased up Wall Street gains, with a 1% rose for Japan's Nikkei Average and more modest advances elsewhere. A weaker yen (USDJPY) contributed to the gains on the Nikkei. Gold (GCM4) rose 1%, while oil (CLK4) was flat.

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