Tigrent Inc. (OTCBB: TIGE) zoomed 150 percent higher in price Thursday to 20 cents, making it one of the improvement leaders among micro-caps. Volume for the stock was 29,700 shares, more than double its daily average. TIGE is a provider of educational training seminars, conferences and services across multiple delivery channels that help students become financially literate.

Deltron Inc. (OTCBB: DTRO) bought and sold 57 million shares Thursday, or better than triple its daily average. Its price hike was impressive, too; 54.6 percent to 17-100ths of a cent. DTRO acquires profitable businesses with strong management teams, substantial revenue and established market positions.

Diguang International Development Co. Ltd. (OTCBB: DGNG) capsized 72.7 percent in price to 12 cents. Volume for the stock was 30,000; its usual daily average is around 11,000. Chna-based DGNG is a developer and producer of CCFL and LED backlights for a wide range of TFT-LCD products.