The chief operating officer of Meggitt sold over half a million pounds-worth of shares in the aerospace engineer on the same day broker Bernstein downgraded the stock.David Johnson sold 97,579 shares for an individual price of 563.95p, pocketing a total of £550,297 in the transaction. He now holds 125,062 ordinary shares in the engineering business.Also on Monday, the deputy chairman and non-executive director Nigel Rudd bought his first shares in the group.Rudd, who will join the firm officially in April after Meggitt's annual general meeting, bought 20,000 shares for 564.5p each, spending a total of £112,900.Bernstein lowered its recommendation on the stock to 'neutral', pulling its shares down 1.74% to 564.5p by 15:38.Top Director BuysMeggitt (MGGT) Director name: Sir Nigel RuddAmount purchased: 20,000 @ 564.50p Value: £112,900Digital Globe Services Ltd (DI) (DGS) Director name: Mr Jeffrey CoxAmount purchased: 113,345 @ 58.97p Value: £66,840Picton Property Income Ltd (PCTN) Director name: Mr Trevor AshAmount purchased: 50,000 @ 68.50p Value: £34,250Numis Corporation (NUM) Director name: Ms Catherine JamesAmount purchased: 12,000 @ 261.40p Value: £31,368Picton Property Income Ltd (PCTN) Director name: Mr Roger LewisAmount purchased: 28,395 @ 68.50p Value: £19,451El Oro Ltd (ELX) Director name: Mr Subbarayan B. KumaramangalamAmount purchased: 30,000 @ 50.00p Value: £15,000Tritax Big Box Reit (BBOX) Director name: Mr Richard W JewsonAmount purchased: 10,000 @ 110.00p Value: £11,000Top Director SellsHiscox Ltd (CDI) (HSX) Director name: Mr Richard WatsonAmount sold: 134,229 @ 810.69p Value: £1,088,181Big Yellow Group (BYG) Director name: Mr Nicholas VetchAmount sold: 100,000 @ 656.00p Value: £656,000Meggitt (MGGT) Director name: Mr David Johnson Amount sold: 97,579 @ 563.95p Value: £550,297