Polycab India, Aptus Value Housing Finance and Mazagon Dock Shipbuilders have all formed a Bullish Harami Cross pattern, which typically appears after a downtrend. The pattern suggests a potential trend reversal, with a small bullish candle indicating buying pressure and a possible shift in sentiment. However, it is important for investors to assess the financial performance, order book and growth prospects of each company before making an investment decision based on the pattern.