Shares of Ambuja Cements slipped 4 per cent to Rs 345.20 on the BSE in Friday’s intra-day trade after the company reported a weak operational performance for December quarter (Q4) with margin contraction of 651 bps quarter-on-quarter (QoQ), 660 bps year-on-year (YoY) to 15.2 per cent on account of higher fuel prices and flat realisations.