Today’s upgrades for Validea’s Book/Market Investor model include STAR BULK CARRIERS CORP (SBLK), with a rating change from 0% to 80% based on strong fundamentals and valuation. With 112 vessels in its fleet, SBLK operates in the Water Transportation industry, meeting several criteria of the strategy. Another stock, NAVIGATOR HOLDINGS LTD (NVGS), a small-cap value stock in the same industry, saw its rating rise from 0% to 90%. With 59 liquefied gas carriers, NVGS meets most of the strategy’s tests. Both companies have shown improvements and are gaining interest from investors. Joseph Piotroski, an accounting professor, developed the strategy behind these upgrades, with a proven track record of success.

Read more at Nasdaq: Validea Joseph Piotroski Strategy Daily Upgrade Report – 12/11/2025