Double witching day

Definition:

The last trading day before expiry of options and futures on the same underlying asset, resulting in a variety of arbitrage strategies to close out positions.

Investing Essentials


Copyright © 2011 Campbell R. Harvey, Professor of Finance, Fuqua School of Business at Duke University

Term of the Day

Effective margin (EM)

Used with SAT performance measures, the amount equal to the net earned spread, or margin of income, on assets in excess of financing costs for a given interest rate and prepayment rate scenario.

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