Portfolio manager Mark Roussin says investors should test a stock thesis for flaws before seeking reasons to buy. He says discipline matters amid sharp market m

BWB News TV • 2026-07-23 15:01 UTC • By Billy Odell Tucker-Robinson

Portfolio manager Mark Roussin says investors should test a stock thesis for flaws before seeking reasons to buy. He says discipline matters amid sharp market moves and strong fundamentals in stocks like Nvidia and Qualcomm.

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