The primary driver of the collar strategy’s returns is the movement of the market itself. Not only is the direction of the market important but the degree or magnitude of the market’s move is also significant. It is often said that a collar is a moderately bullish strategy.
The key word is moderately. Since the core of a collar is a long position in a portfolio of equities, the holder obviously hopes that the market goes up. However, the risk is if the market goes up too much, the call options will go from being out-of-the-money to being in-the-money. Under such circumstances, the portfolio manager really only has a few options.
One, they could close out the trade and take a loss on the option trade. Two, the underlying asset could be called away and miss out on the gains. Or three, the portfolio manager could cross their fingers and pray that the market reverses direction and dips back below the strike price before being called. Either way, the collar has effectively sold off its upside potential in a sharply rising market.
Of course, the benefit to the collar strategy is when the market goes down. If the market goes past the put strike and if the collar was implemented correctly, the strategy should be protected from losses beyond a certain point.
That is why the strategy is called a collar: The range of returns is meant to be “collared” with limited downside but also limited upside.