Ricardo PLC - Shoreham By Sea, West Sussex-based environmental and engineering consultant - Chief Executive Officer Graham Ritchie buys 14,460 shares for £5.16 each, and Chair Mark Clare buys 20,000 shares for £5.126205 each on September 14.

Current stock price: 512.00 pence, closed down 0.8% on Monday in London

12-month change: up 19%

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