Stocks: 4 things to know before the open

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Investors are back from the weekend in a foul mood.

U.S. stock futures are slipping, European markets are sliding and nearly all Asian markets have closed in the red.

Here are the four things you need to know before the opening bell rings in New York:

1. Griping about Greece: The negative tone can be attributed directly to Greece, after the latest round of talks between the small nation and its creditors collapsed on Sunday.

The main market index in Greece is down by about 5%, led by a major drop in banking shares, including a 12% plunge in shares in Piraeus Bank (BPIRF). Greek 10-year bond yields are rising to nearly 12.4%.

Many other key indexes in Europe are also down by more than 1%.

Greece urgently needs more money to pay its bills, but hasn't been able to reach an agreement as the two sides wrangle over the terms of a deal.

The failure of Sunday's talks piles pressure on Greece to get a deal when European finance ministers meet on Thursday in Brussels. The risk of default is rising fast, and that could cause the country to stumble out of the eurozone.

Related: Fear & Greed Index

2. Saudi stocks: Saudi Arabia's stock market officially opens up to foreign investors Monday.

However, ordinary investors won't be able to buy shares.

At present, the rules only allow institutional investors such as banks, brokerages and fund managers to invest, and they have to have at least $5 billion in assets.

Shares in the local benchmark TASI index are declining by about 1% Monday, alongside other global stock markets.

Related: China's stock market is now worth over $10 trillion.

3. Stock market movers -- Integrys Energy, Micron Technology: Shares of Integrys Energy (IEH) were up 2.9% in extended trading. This comes after the last of several state and federal regulatory agencies approved a deal that would see Wisconsin Energy (WEC) acquire Integrys for $9.1 billion.

Shares in Micron Technology (MU) are dipping premarket by 3%, alongside competitor SanDisk (SNDK), which is also off by about 1.5%.

Related: Translating the Fed into English

4. Weekly market recap: Last week was an uninspiring time for stocks.

The Dow Jones industrial average rose by 0.3% throughout the week, while the S&P 500 edged up by 0.1%. The Nasdaq sunk back 0.3%.

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