[Update, Monday morning: It’s official: Google passed Microsoft’s market value for the first time in its history this morning, although it’s going back and forth as their share prices fluctuate during regular trading today. We’ve updated the chart above. Original post follows.]

Google’s stock price has been rallying recently, and the search giant appears on track to reach a milestone in the days ahead —possibly surpassing Microsoft in market value for the first time.

The Wall Street Journal noted this fact at the end of the week, and a reader pointed it out in a comment on our month-in-review post earlier today. Curious what the trends looked like, I used the stock charting tools from YCharts to put together the graph above, adding Apple and Amazon to the mix for a little more context.

One interesting point to note: Microsoft was the most valuable of the four companies until early 2010, and is now at risk of falling to third.

No pressure, Windows Division, but the Redmond company clearly needs something big with the Oct. 26 launch of Windows 8.

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