(Sharecast News) - Big Yellow chairman Nicholas Vetch lowered his stake in the FTSE 250-listed self-storage firm on Wednesday.Vetch, who co-founded the Surrey-based firm back in 1998, and his wife disposed of 324,593 ordinary shares at an average price of 987.73p each, for a total value of £3.2m.Meanwhile, Byways Investments, a company beneficially owned by Vetch's children, sold 166,236 ordinary shares for a total of £1.6m.Big Yellow acquired freehold sites in Wembley, North London and Kingston North in South West London last month, bringing its total pipeline of proposed new stores, including the replacement of its Battersea store, to 12, which on completion would result in approximately 760,000 square feet of additional capacity, or 16% of its current maximum lettable area.It said its pipeline, which had taken almost five years to build, should allow new stores to be opened on a "reasonably regular and sustainable" basis.As of 1620 GMT, Big Yellow shares had slipped 2.07% to 969.50p.Top Director BuysJPMorgan Chinese Inv Trust (JMC)Director name: Mr David GrahamAmount purchased: 11,933 @ 282.68pValue: £33,732 C4X Discovery Holdings (C4XD)Director name: Dr Clive DixAmount purchased: 40,650 @ 61.50pValue: £25,000 BBA Aviation (BBA)Director name: Ms Victoria JarmanAmount purchased: 8,363 @ 237.80pValue: £19,887 ProVen Growth & Income VCT (PGOO)Director name: Ms Natasha Christie-MillerAmount purchased: 21,742 @ 69.00pValue: £15,002 ProVen Growth & Income VCT (PGOO)Director name: Ms Natasha Christie-MillerAmount purchased: 21,742 @ 69.00pValue: £15,002 ProVen VCT (PVN)Director name: Mr Neal RansomeAmount purchased: 17,827 @ 84.10pValue: £14,993 ProVen Growth & Income VCT (PGOO)Director name: Mr Malcolm MossAmount purchased: 14,494 @ 69.00pValue: £10,001 Top Director SellsBig Yellow Group (BYG)Director name: Mr Nicholas VetchAmount sold: 324,593 @ 987.73pValue: £3,206,102 Big Yellow Group (BYG)Director name: Mr Nicholas VetchAmount sold: 166,236 @ 987.73pValue: £1,641,963 Croda International (CRDA)Director name: Mr Steve FootsAmount sold: 19,443 @ 4,902.00pValue: £953,096 Croda International (CRDA)Director name: Mr Jez K MaidenAmount sold: 10,057 @ 4,902.00pValue: £492,994 Croda International (CRDA)Director name: Mr Steve FootsAmount sold: 6,855 @ 4,880.00pValue: £334,524 Croda International (CRDA)Director name: Mr Tom BrophyAmount sold: 5,348 @ 4,902.00pValue: £262,159 Croda International (CRDA)Director name: Mr Jez K MaidenAmount sold: 3,779 @ 4,880.00pValue: £184,415 Croda International (CRDA)Director name: Mr Keith LaydenAmount sold: 3,001 @ 4,902.00pValue: £147,109 Croda International (CRDA)Director name: Mr Keith LaydenAmount sold: 2,926 @ 4,880.00pValue: £142,789 Croda International (CRDA)Director name: Mr Tom BrophyAmount sold: 752 @ 4,880.00pValue: £36,698