Definition
The bid-ask spread is the most visible component of transaction cost for exchange-traded securities. The bid is the highest price a buyer is willing to pay; the ask (or offer) is the lowest price a seller is willing to accept. A client who buys at the ask and immediately sells at the bid faces an immediate mark-to-market loss equal to the spread. For highly liquid large-cap TSX stocks, the spread may be as narrow as one tick ($0.01); for thinly traded small-cap stocks or ETFs tracking illiquid underlying markets, the spread can be several percent of the price. Under UMIR 5.1 and the best-execution obligation, dealers must consider the bid-ask spread as part of total transaction cost when routing orders. Spreads widen during market stress, at the open and close of trading, and ahead of material news announcements. For ETFs, the bid-ask spread in the secondary market is directly influenced by the spread of the underlying basket and the authorized participant's hedging cost.
Source
UMIR 5.1; CIRO IDPC Rule 3600 series; NI 23-101
Where this shows up on the CIRE
- Outcome 8.1