By Ryan Vlastelica
NEW YORK (Reuters) - Shares of Civeo Corp
The plunge came after the oilfield company, which was spun off by Oil States International Inc
Civeo, currently based in Houston, said it plans a "self-directed redomiciling" to Canada, which it believes is allowed under the U.S. tax code since more than 25 percent of revenue, assets and employees are based in Canada.
The stock lost 45 percent to $13.89, falling on volume of nearly 13 million shares, many times its 50-day average of about 976,000.
Index snapshot at 12:09 EDT:
* S&P 500 <.SPX> was falling 5.21 points, or 0.26 percent.
* Nasdaq Comp <.IXIC> was losing 4.45 points, or 0.1 percent.
* Dow industrials <.DJI> was dropping 52.5 points, or 0.31 percent.
* Russell 2000 <.TOY> was adding 0.11 points, or 0.01 percent.
* S&P MidCap <.IDX> was dropping 2.41 points, or 0.17 percent.
* S&P SmallCap <.SPCY> was losing 0.16 points, or 0.02 percent.
(Editing by Nick Zieminski)