The company was Yahoo! Japan Corporation (YAHOY) (YAHOF), according to StockMarketTrivia.com. A representative for Shareholder Relations for the Yahoo! Japan company stated that the highest price of the stock was 167.9 million Japanese Yen on Feb. 22, 2000. If you exchange the amount of Japanese Yen into US dollars at the exchange rate at that time (Approx USD1=JPY111.01), it was approximately $1,512,500 per share.
Yahoo! Japan is a Japanese Internet company formed as a joint venture between the American internet company Yahoo! (YHOO) and the Japanese internet company SoftBank (SFTBF). It was founded in 1996 and is headquartered in Tokyo, Japan.
For the latest quarter ending June 30, 2012, the company reported an earnings increase of 7.6% on an 8.0% rise in revenues. The stock trades on the JASDAQ and in the US in the over-the-counter market.
Disclosure: Author owns YHOO.