Ilene Fiszel Bieler
Analyst
Yes, sure. Simon, good question. Yes, I mean, obviously, we know there are so many different things that go into fees per million and that impact our fee capture, right? And so some of that, I think you just mentioned when you talk about if we see a greater -- and Chris just talked about this a little bit he was talking about the environment. But we see a greater percentage of high yield, obviously, which is our highest average fee product area, that's helpful for capture, right? And so that's part of what he was just mentioning. On the other hand, as you see growth of PT that has a negative impact on capture, right? So that's another thing that you balance. I looked back over, let's say, call the last five years, right? And you had an average of about $173 per million when you talk about like sort of what's a good level. And if you recognize that, that included capture of about $204 fee per million during COVID, which we would not expect to see again, given all of the unique factors that happened during that time period. There's still likely room, right, for better capture than what we've been seeing if a number of things happen, right? And so we saw, for example, the improvement to $154 in October, which was up from $150 in September. So when you see an increase in duration, which we talked a little bit about in high grade, that helps, right? Another thing to keep in mind is what Rich mentioned a moment ago about Open Trading, right? That's our premium price liquidity venue. So an increase in valve we believe would also enhance fee per million because of the increase in activity that could be expected through Open Trading, right? Now what we most likely would not get back in that sort of average fees per million price range that I just talked about was the impact of portfolio trading. And that's been running, let's call it, a negative headwind of, call it, $5 to $6 of fees per million. So I just had a lot of different things, right? But net-net, when you do a combination of, let's say, a lower rate environment, an upward sloping yield curve for high grade, a higher mix of high yield, increased activity and open trading, all of those things can help these per million levels. And that should make us in a place that is likely higher than what you're seeing right now. But again, there's a lot of moving pieces to that, and we'll have to see where it all turns out.