I spent some time yesterday trying to find historical bid/ask spreads for TZA/SRTY, but didn't have much luck, so I ran some numbers from the closing data, and here's what I found...
[TABLE="width: 256"]
[TR]
[TD="class: xl65, width: 64"][/TD]
[TD="class: xl66, width: 64"]CLOSE[/TD]
[TD="class: xl66, width: 64"]BID[/TD]
[TD="class: xl66, width: 64"]ASK[/TD]
[/TR]
[TR]
[TD="class: xl67"]TZA[/TD]
[TD="class: xl65"]21.04[/TD]
[TD="class: xl65"]21.05[/TD]
[TD="class: xl65"]21.12[/TD]
[/TR]
[TR]
[TD="class: xl65"][/TD]
[TD="class: xl65"]DIFF[/TD]
[TD="class: xl65"]0.01[/TD]
[TD="class: xl65"]0.08[/TD]
[/TR]
[TR]
[TD="class: xl65"][/TD]
[TD="class: xl65"][/TD]
[TD="class: xl65"][/TD]
[TD="class: xl65"][/TD]
[/TR]
[TR]
[TD="class: xl67"]SRTY[/TD]
[TD="class: xl65"]13.26[/TD]
[TD="class: xl65"]11.5[/TD]
[TD="class: xl65"]13.74[/TD]
[/TR]
[TR]
[TD="class: xl65"][/TD]
[TD="class: xl65"]DIFF[/TD]
[TD="class: xl65"]-1.76[/TD]
[TD="class: xl65"]0.48[/TD]
[/TR]
[/TABLE]
The max spread for TZA was $.08 from the closing price, while the max spread for SRTY was (gulp) $1.76 from the closing price. That's a huge difference, especially when you consider that's a per share cost.
This may be an extreme case, as we're only looking at one moment in time, but I think it may turn out to be a pretty good indicator of the spread disparity between the two. I will continue to monitor the spreads, but it looks like Tom hit the nail on the head on this one.
Thank you Tom!