By Anora Mahmudova, MarketWatch

NEW YORK (MarketWatch) -- U.S. stocks traded sideways, drifting in and out of positive territory on Thursday, but the main indexes were set to finish a holiday-shortened week with modest gains.

Investors weighed a mixed batch of earnings reports against largely positive economic data. Thursday has one of the busiest schedules in the earnings season as 25 companies on the S&P 500 are scheduled to report profits, according to FactSet.

The S&P 500 (SPX) was less than a point higher at 1,862.91 building on three-straight days of gains, which sent the benchmark index into positive territory for the year.

The Dow Jones Industrial Average (DJI) was 12 points, or 0.1%, lower at 16,411.91.

The Nasdaq Composite (RIXF) rose 5 points, or 0.1%, to 4,099.06.

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"We expect today's trading to be quiet, as a lot of investors are probably consolidating ahead of the long weekend," said Jim Russell, senior equity strategist at U.S. Bank Wealth Management.

"It appears the investing community will give somewhat of a free pass to companies this quarter, as the cold-weather excuse for lower profits is legitimate. This will not be the case in the next quarter," he added.

In economic news, two separate reports pointed to more evidence that softening in the economy was largely weather related.

The number of people who applied for unemployment-insurance benefits ticked up by less than expected, a slight increase from the lowest level since 2007, signaling that employers are maintaining a slow pace of layoffs, according to government data released Thursday.

A reading of manufacturing sentiment in the Philadelphia region improved in April, according to data released Thursday, contradicting a disappointing regional index from the New York Fed released earlier in the week.

Google, IBM sink after disappointing results, Goldman, Morgan Stanley rise

Shares of IBM Corp. (IBM) dropped 3.5% after the tech bellwether late Wednesday reported an eighth-straight quarter of revenue declines and missed analyst expectations.

Google Inc. (GOOG) (GOOGL) dropped 3.8% after a disappointing earnings report published late Wednesday.

American Express Co.(AXP) fell 2.1% after it reported quarterly revenue that missed expectations late Wednesday.

Banking giant Goldman Sachs Group Inc. (GS) gained 1.3% after it reported first-quarter earnings above expectations.

Peer firm Morgan Stanley (MS) rose 4.4% after its profit topped estimates.

General Electric Co. (GE) said it made an adjusted 33 cents a share in the first quarter, slightly beating FactSet estimates of 32 cents a share. Shares gained 1.8%.

UnitedHealth Group Inc.(UNH) slid 3.3% after its earnings beat expectations, but revenue missed.

Chipotle Mexican Grill (CMG) shares rose 4.8% as its first-quarter profit and revenue surged, largely attributed to a 13.4% jump in same-store sales.

Shares of Sabre (SABR), the travel-tech firm which owns the Travelocity website, and Weibo (WB), China's microblog equivalent of Twitter, are expected to attract attention when they debut on the market Thursday. Sabre said late Wednesday its initial public offering had priced at $16 a share, while Weibo priced at $17, the low end of its range, while selling fewer shares than expected.

In other financial markets, European stocks traded mostly lower amid escalating tensions in Ukraine after three pro-Russia activists were killed and 13 wounded in fighting. Asia markets closed mostly higher. Oil prices inched higher, while metals were little changed.

More must-reads from MarketWatch:

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