Apple Online StoreShares of Apple Inc. today rose $3.61, or 1.61%, on average volume of 21,393,483 shares to set a new all-time closing high of $228.36.

Apple’s previous closing high was $226.60. set on March 12, 2010. Apple’s all-time high (intraday) stands at $228.78, set during trading today. Apple’s 52-week low was $101.75, set on March 23, 2009.

At market close, Apple’s market value stands at $207.08 billion since financial sites all use the latest published share count for Apple: 906.8 million shares outstanding as of January 15. However, Apple’s actual diluted share count, as per its latest 10-Q, was 919.783 million shares, which means that the company actually has a market cap of $210.04 billion. For the lists below, we’ll use what the financial sites use.

Apple went public on December 12, 1980 and closed with a market cap of $1.431 billion. Apple’s all-time low market value was $630.9 million on July 8, 1982.

The top five U.S. publicly-traded companies:
1. Exxon Mobil (XOM) – $316.09B
2. Microsoft (MSFT) – $262.06B
3. Wal-Mart (WMT) – $212.66B
4. Apple (AAPL) – $207.08B
5. Berkshire Hathaway (BRKA) – $203.58B

Selected companies’ current market values:
• Google (GOOG) – $174.57B
• IBM (IBM) – $168.05B
• Cisco (CSCO) – $152.53B
• Hewlett-Packard (HPQ) – $124.64B
• Intel (INTC) – $125.24B
• Disney (DIS) – $65.96B
• Amazon (AMZN) – $57.46B
• Nokia (NOK) – $56.59B
• Research In Motion (RIMM) – $42.02B
• Sony (SNE) – $40.58B
• Dell (DELL) – $29.79B
• Yahoo! (YHOO) – $22.45B
• Adobe (ADBE) – $18.46B
• Motorola (MOT) – $17.00B
• RealNetworks (RNWK) – $694.44M
• Beleaguered Palm (PALM) – $677.08M

AAPL quote via NASDAQ here.