Check out which companies are making headlines after the bell Tuesday:

Tesla - The electric car maker announced it is starting a lease-to-own program for its Model S vehicles. U.S Bank and Wells Fargo will provide 10 percent down financing on a Model S purchase. Tesla shares edged higher in extended-hours trading.

(Read More: S&P 500, Dow End at Record Levels; HPQ Drops)

Zynga - The company announced it will will roll out two real-money versions of its casino and poker games in the UK over the next few days, marking the gaming giant's first offerings in the online gambling space. Shares jumped in extended-hours trading. (Read More: Is Virtual Reality the Next Big Thing in Gaming?)

Verizon - The wireless telecommunications company denied an earlier report that it is looking to partner with AT&T to acquire British cellphone company Vodafone. However, the Dow component said it would be a willing buyer of Vodafone's current 45-percent share of Verizon's wireless venture. Vodafone dropped in extended-hours trading.

U.S. futures up. Europe mostly up as well...huh? It's odd that volumes were weak yesterday on the first trading day of the quarter, which normally sees some inflows. Maybe it's because Europe was closed yesterday?

That may be the story: Money is coming into the U.S. from other parts of the world.

That seems to be the case with exchange-traded funds. The global ETF industry saw record first-quarter inflows, according to BlackRock. Investors piled into stock funds, which accounted for 93 percent of inflows.

Developed market stock funds pulled in big money, while demand for emerging market stocks sank. Still no clear sign of any "Great Rotation" out of bonds and into stocks. Bond funds garnered $11.6 billion in the first quarter, notching an eighth consecutive quarter with inflows of at least $10 billion.

Check out which companies are making headlines before the bell on Tuesday:

Humana, UnitedHealth Group, Aetna, Cigna - The Centers For Medicare and Medicaid Services will increase fee payment rates by 3.3 percent in 2014. That's a reversal of the 2.3 percent drop projected last month, and followed intense lobbying from the health insurance industry.

Nasdaq OMX Group - Nasdaq will buy the eSpeed trading platform for U.S. Treasurys from BGC Partners for $750 million. Nasdaq has been trying to expand into non-stock asset classes because of falling stock trading volumes.

Apple - Goldman Sachs has removed Apple from its "Conviction Buy" list, although it still rates the stock a "buy." It said the most recent product cycle hasn't provided the boost for Apple that it had expected.

Take a look at some of Tuesday's midday movers:

Valero fell hard after comments from a company spokesman suggesting that compliance with proposed new EPA pollution standards for gasoline could cost the refiner between $300 to $400 million in new equipment upgrades. Refiners Tesoro and Western Refining traded lower as well.

Hertz jumped after the car rental company raised its three-year financial guidance on strong global demand.

Bull market or not, investors are always searching for stocks that pay dividends. And the good news is that more and more companies are offering a return on investment to attract new capital — as yields are rising.

Aggregate dividends per share for S&P 500 companies grew nearly 16 percent year-over-year at the end of last year — while the number of companies paying a dividend to shareholders over the trailing month period hit a new 13-year high of 405, or roughly 81 percent of the S&P 500, according to Factset.

It's no April Fool's Day joke. Drivers are indeed paying less to fill up their gas tanks than they did a few weeks ago, a month ago, a year ago.

The national average price of regular gasoline was $3.63 a gallon on Monday, according to AAA. That's 13 cents lower than the average price on March 1 and 30 cents cheaper than April 1, 2012.

Check out which companies are making headlines after the bell Monday:

Nuance Communications - Billionaire investor Carl Icahn took a 9.27 percent passive stake in the speech recognition software company, sending shares sharply higher in extended-hours trading.

Nasdaq - Nasdaq will acquire eSpeed from BGC Partners in a deal worth $750 million, which will allow the firm an entry point into the electronic fixed income business. BGC shares skyrocketed in extended-hours trading, while Nasdaq shares were largely unchanged after being temporarily halted.

(Read More: Stocks End Down After Weak ISM; AAPL Drops)

Medicare-focused insurance companies such as Humana and United Health rallied in extended-hours trading after the Centers for Medicare and Medicaid Services released a final estimated payment growth rate of 3.3 percent for insurers. In February, the government proposed a payment reduction of more than 2 percent.

First day of the quarter a "sell the gainers" event: major sectors show perfect inverse image of Q1 performance.

The two outperformers in Q1 were the Dow Transports and Russell 2000. However, the two biggest decliners today are the transportation stocks and small-cap names.

Not surprisingly, industrials and materials are notably weak. You have a double whammy of below-expectation ISM manufacturing data in the U.S. and it's counterpart, China, is also a little short. And, of course, we are in recession territory for manufacturing indices in Europe.

Little wonder that copper futures are breaking to a nearly eight-month low...and that metal stocks across the board (aluminum, steel, iron ore, copper, and coal) are down three percent or more.

And note new lows in AK Steel (AKS), ArcelorMittal (MT), and coal producer Walter Energy (WLT).

And with oil down, many big oil service names - Halliburton (HAL) and Schlumberger (SLB) - and drillers Hercules Offshore (HERO) and Superior Energy (SPN) are down three to four percent.

Tech is also weak: Micron Technology (MU) is down four percent, leading chip stocks lower.

One of the survey respondents to the ISM manufacturing survey, who works in computer and electronic products, summed up the sentiment by saying that that "second half of 2013 looks promising, the first half is a mixed bag."

If today's declines hold, it would be the first time since Q4 2011 that the S&P 500 has been down on the first trading day of a quarter (thank you, Robert Hum).

Take a look at some of Monday's midday movers:

Apple traded lower as Fidelity's Contrafund revealed that Google has replaced the iPhone maker as its largest holding. Shares of Google have outperformed Apple over the past year by about 50 percent.

Molson Coors Brewing traded higher after an upgrade from Goldman Sachs to a "buy," with a price target $63 per share. The analyst cited a recovery in North American beer volumes and an improving employment outlook for the upgrade.

New highs, but stock market slightly defensive in tone. The quarter ended with the biggest gains in the last two weeks from the most defensive sectors: healthcare, utilities, consumer staples. Financials, industrials, tech and basic materials lagged.

Since 1945, whenever the S&P 500 recorded a positive performance in the first quarter, the average performance for the three remaining quarters improved by an average 1.2, 1.1, and 0.4 percentage points, respectively, according to Sam Stovall at S&P Capital IQ.