Investors should take an independent, long-term view of high-flying stocks rather than following herd mentality.

“I think for us our research will say we'll take a step back and we'll you know, we take a 10-year look at this and we use it kind of you know, assume the the growth rates out.”

There is still potential upside in US and European equity markets despite recent rallies.

“Preston touched on it, but in the US, we're about 5% below where we think the market is worth, and indeed about 3% in Europe. So, despite those rallies that we've had year-to-date, there's still some upside”