買い占める[かいしめる] (kaishimeru)

彼かれらはその会社かいしゃの株かぶを買い占かいしめようとしている

They are trying to buy up the company's shares.

大だい投資とうしかは株かぶを買い占かいしめた。

The big investor bought up the stocks.

更にこうした一連の遣り取りが内外に伝わると2月28日には横浜居留地の商人たちが会合を開いて明治政府に贋貨によって生じた損害賠償を求める事を決議し、更に一部の商人が今後の回収に期待して暴落した贋貨を買い占めるなど様々な思惑が動き出し始めていた。

Furthermore, when this series of exchange spread around Japan and foreign countries, people began to move on their various ideas, for example, merchants of Yokohama settlement held a meeting on February 28, and decided to seek compensation from the Meiji Government for the damage caused by counterfeit money, or some merchants started to buy up the counterfeit money which had slumped anticipating the next recall.