wild intra-day price swing ETF?

Financial Planning - Financial planning in general. (Moderated) 

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Subject Author Date wild intra-day price swing ETF? makbo2 08-17-2007
Posted by on August 17, 2007, 12:45 pm I was quite surprised to see the following behavior this morning for the following exchange traded fund: VANGUARD INDEX FDS SMALL CP ETF (VB: AMEX). Note the "day's range" -- it appears that for a brief 10 or 20 minute period shortly after today's market opening, the price of this ETF soared more than 25%, then dropped back down near its "normal" price. Open 71.23 Previous Close 68.20 Day's Range 69.78 - 90.50 There were also two spikes in trading volume, one buy, one sell, which fits. Is there something I should know that explains this type of behavior? If someone were to check the 52-week high/low values for this fund in the near future, is there any way to easily determine that the "high" was a twenty-minute anomaly, and not a normal valuation? Yes, I know the Fed's interest rate announcement had an immediate impact on the market, but 25+%??? -Mark Bole Similar Threads Posted Source of historical intraday stock prices? May 23, 2008, 7:13 pm New Disney E-ticket attraction: Mr Dow's Wild Ride :-) August 16, 2007, 7:55 pm How do they determine the price and its changes? January 15, 2008, 8:27 am Appraisal vs Selling Price September 21, 2007, 1:54 pm Mutual Fund Price December 27, 2007, 8:01 am (Invest) U.S. Price of Construction USD/SF May 21, 2008, 5:21 am (L.T. Invest) U.S. Offices Price USD/SF May 21, 2008, 1:39 pm Ratio of Monthly Rent to Purchase Price October 1, 2006, 2:24 pm current price earnings ratios of growth and value indices February 14, 2007, 9:54 am Bond Dealers Who Publish Price and Markups for Bonds? October 10, 2008, 5:08 am