In the latest episode of "Trader Talk," Kenny Polcari sits down with Mark Malek, chief investment officer of SiebertNXT, to explore how quantitative investing and clear investment theses can help investors navigate today's volatile markets. Malek emphasizes using data-driven models to cut through noise, avoid over-diversification, and focus on high-probability opportunities, especially in defensive sectors. The two also weigh in on rate-cut expectations, soft versus hard data, and why sticking to fundamentals matters more than ever. 'Trader Talk with Kenny Polcari on Yahoo Finance delivers expert analysis and actionable insights. Drawing on decades of trading floor experience, we empower you to navigate market volatility and keep your portfolio from getting burned. Watch more episodes of Trader Talk at https://finance.yahoo.com/videos/series/trader-talk/ Thoughts? Questions? Fan mail? Email us at tradertalk@yahooinc.com. Yahoo Finance’s Trader Talk is hosted by Kenny Polcari and produced by Langston Sessoms.