Stocks wavered on Tuesday, Sept. 19, making new records a toss-up as the Federal Reserve meets to discuss monetary policy. 

The Dow Jones Industrial Average was up 0.07%, the S&P 500 added 0.03%, and the Nasdaq fell 0.07%. Any gains for the Dow and S&P 500 would put the indexes at records by the close. The Nasdaq is less than 10 points from its own record. 

A generally upbeat mood propelled stocks upward the day before, pushing the S&P 500 and Dow Jones Industrial Average to new heights. The S&P 500 traded above a record level of 2,500 and set a new high for its second day in a row, while the Dow settled at a record for the fifth day. The Nasdaq missed a new milestone.

The monetary-policy arm of the U.S. central bank, the Federal Open Market Committee, will conclude a two-day meeting with an announcement on Wednesday afternoon, followed by Chair Janet Yellen's press conference.

Markets have priced in a zero chance of change to U.S. interest rates, but near-certainty to the Fed beginning to unwind its $4.5 trillion balance sheet, a process it previously said it would begin "relatively soon."

"If the signals are right, then this week should mark the point when the ... Fed finally begins the long-overdue process of unwinding its bloated balance sheet," said Aberdeen Standard Investments investment manager James Athey. "That would make it a milestone in the post-crisis monetary experiment."

Moving out of "this parallel universe of endless liquidity is going to be a fraught process," he added. "No one's done it before, so no one can credibly claim to know what will happen. We are very early on in the process but, so far, financial markets have largely remained unmoved and unencumbered by the prospect of falling, as opposed to endless, liquidity."

Fed funds futures are currently pricing in a nearly 61% chance of a 25-basis-point increase at the December meeting, putting the federal funds rate at 1.25% to 1.5%.

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President Donald Trump beat the drum for nationalism in an address to the U.N. General Assembly on Tuesday. Trump told world leaders that he would "always put America first." He also said that now was a time of "immense promise and great peril."

On North Korea, Trump said leader Kim Jong-un was head of a "depraved" regime and that the U.S. was "ready, willing and able" to use military force against the nation. The authoritarian country has conducted a number of missile tests in recent weeks, with two of the devices flying over Japan, and has threatened to bomb U.S. territory Guam. The North Korean face-off has unsettled markets since it returned to headlines in early August. 

In economic news, housing starts declined by 0.8% to a seasonally adjusted rate of 1.18 million in August. That decrease matched estimates. Building permits rose by 5.7% to a rate of 1.3 million, slightly higher than an expected 1.22 million. 

"The consensus for this month -- only slightly higher than last month and prior year results -- reflects tempered expectations driven by the impacts of hurricanes Harvey and Irma along with heightened concern that the hurricanes will exacerbate an already tight labor market, resulting in the slowing of permits, starts and completions in the short term," Scott Volling, principal at PwC, said in a note. 

Import and export prices moved higher in August, according to the Bureau of Labor Statistics. Import prices increased by 0.6%, higher than an expected 0.4%. Excluding fuel, prices rose 0.3%. Export prices rose by 0.6%, triple the expected increase. 

AutoZone Inc. (AZO)  cut back its gains even after a better-than-expected fourth quarter. The car parts retailer earned $15.27 a share over the three-month period, up from $14.30 a year earlier. Adjusted earnings of $5.18 a share beat estimates by 7 cents. Revenue increased by 3.3% to $3.51 billion, edging out estimates of $3.49 billion. Domestic same-store sales increased 1%, falling short of an expected 1.6%. 

Steelcase Inc. (SCS) added more than 4% after exceeding earnings consensus over its recent quarter. Second-quarter net income was flat at 31 cents a share, but beat estimates of 23 cents. Revenue increased just over 2% to $775.6 million, but missed expectations of $757.4 million. Third-quarter guidance also came in lower than estimated -- the company anticipates 21 cents to 25 cents a share, below a projected 28 cents. 

Synchronoss Technologies Inc. (SNCR) moved sharply lower after its largest shareholder, Siris Capital Group, backed off of previous interest in an all-cash acquisition. Siris said it could potentially pursue other deals with the company, and Synchronoss said "active discussions" are ongoing. 

Best Buy Co. Inc. (BBY) targets $43 billion in full-year revenue by fiscal 2021, a roughly 9% increase from $39.4 billion in fiscal 2017, the company said before its investor presentation slated for 2 p.m. ET on Tuesday. The electronics retailer also hopes to eliminate $600 million in cost savings by the end of fiscal 2021. 

Nike Inc. (NKE) moved more than 1% lower, the biggest laggard on the Dow, after Susquehanna Financial downgraded its rating to neutral from positive and cut its price target by $10 to $54. Analyst Sam Poser said in a note that oversupply of its basketball line will likely pull sales and margins lower.   

Morgan Stanley reiterated a bullish stance on Apple Inc. (AAPL) following last week's iPhone X reveal. Analyst Katy Huberty expects customer loyalty and a weaker U.S. dollar to allow for higher pricing without chipping away at demand. The firm reiterated an overweight rating and boosted its price target to $194 from $182. 

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Equifax Inc. (EFX) learned about a major breach of its computer systems in March, almost five months before the date it has publicly disclosed, Bloomberg reported, citing three people familiar with the situation.

Equifax said the breach in March wasn't related to the hack that exposed the personal and financial data on 143 million consumers in the U.S., but one of the people told Bloomberg the breaches involve the same intruders.

Equifax shares were down nearly 2% on Tuesday. The stock has plummeted roughly 34% since news of the breach broke on Sept. 7. 

T-Mobile USA (TMUS) and Sprint Corp. (S)  rose on Tuesday on reports the two had engaged in serious merger talks. T-Mobile parent company Deutsche Telecom (DTEGY) would emerge as the majority owner if the United States' third- and fourth-largest mobile carriers did complete a deal, according to CNBC sources.

Updated from 9:44 a.m. ET, Sept. 19. 

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