Sigma Advanced Systems fell 5% to Rs 914.85 on 13 October for its fourth straight lower circuit and nearly 19% loss over six sessions despite a 497% one-year gain, with analysts at Master Capital Services, Ventura, Globe Capital Market and AT Research flagging stretched valuations around 105 times P/E, an over Rs 8,000 crore order book and key support at Rs 900-910 and Rs 800-725.