Updated from 7:11 a.m.
NEW YORK (TheStreet) -- Here are 10 things you should know for Monday, June 22:
1. -- U.S. stock futures were rallying as a potential Greek debt deal lifted a cloud over U.S. markets too.
European stocks are strongly up as a resolution to the Greek debt crisis seems at hand -- for now, anyway. The European Central Bank has once again raised the limit on the emergency loans available to Greek banks. London's FTSE 100 index was up more than 1%; Paris's CAC 40 and Frankfurt's DAX were both up nearly 3%.
Asian stocks were widely mixed. Tokyo's Nikkei 225 and Hong Kong's Hang Seng both rose more than 1%, but the Shanghai Composite cratered 6.4%.
2. -- The economic calendar in the U.S. on Monday includes the Chicago Fed National Activity Index at 8:30 a.m. and existing home sales data at 10 a.m.
3. -- U.S. stocks on Friday sank on fears about Greece's heavy debt load.
4. -- A Greek debt deal -- at least for the short term -- seemed reachable as Greek Prime Minister Alexis Tsipras presented what he called a "permanent solution" to the country's debt problems to other European leaders. An emergency summit is being held in Brussels on Monday to try to resolve the uncertain debt terms and to guarantee that Greece will not default on its debt.
A deal would allow Greece to extend its debt repayments and to remain on the euro currency.
5. -- Health insurance company Cigna (CI) rejected a $47 billion offer from its rival Anthem (ANTM). Cigna's board said that the buyout offer was too low and that the deal wouldn't benefit shareholders. Anthem's offer was an 18% premium to the value of Cigna shares at Friday's close.
The offer is part of a larger wave of pending mergers in the health care market. Meanwhile, Cigna and Aetna (AET) were both looking at a possible acquisition of Humana (HUM). And UnitedHealth (UNH) recently made a move to buy Aetna. The health care companies are looking to mergers to increase efficiency in their markets.
In premarket trading, Cigna stock was up 8.7%. Anthem stock was rising by 2.9%.
6. -- Natural gas pipeline maker Williams Companies (WMB) is considering a takeover offer for $48 billion. Williams said the offer was unsolicited and that it undervalues the company. Although Williams did not mention the potential acquirer, it is likely Energy Transfer Equity (ETE), according to reports.
Williams is in the midst of acquiring Williams Partners (WPZ), a separately listed natural gas company, although that deal would need to be dropped for Williams Companies to accept the takeover.
In premarket trading, Williams Companies stock was up 28.4%.
7. -- Crude oil prices were rising, as West Texas Intermediate crude neared $60 a barrel and Brent crude oil was over $63 a barrel. Oil prices have risen 35% since January after hitting six-year lows.