Two directors at DS Smith bought stakes in the group one day after the packaging manufacturer said its "differentiated commercial offering" drove strong half-year results.The non-executive directors, Kathleen O'Donovan and Louise Smalley, acquired 10,471 and 14,615 shares respectively at a price of 305.6p each.O'Donovan paid £31,999 in the transaction while Smalley spent £44,663.DS Smith saw shares rise on Thursday after reporting a 45% increase in pre-tax profit during the first six months of the year, helped by strong performances across the board."Our outlook remains positive as the business continues to grow, despite ongoing economic headwinds in many of our markets," group chief executive Miles Roberts said at the time. Top Director BuysMasawara (MASA) Director name: Mr Shingai MutasaAmount purchased: 1,476,243 @ 53.00p Value: £782,409Smith (DS) (SMDS) Director name: Ms Louise SmalleyAmount purchased: 14,615 @ 305.60p Value: £44,663OneSavings Bank (OSB) Director name: Mr Rodney DukeAmount purchased: 20,000 @ 200.00p Value: £40,000Symphony International Holdings Ltd. (SIHL) Director name: Mr Anil ThadaniAmount purchased: 40,000 @ $0.82 Value: $32,800Smith (DS) (SMDS) Director name: Ms Kathleen O'DonovanAmount purchased: 10,471 @ 305.60p Value: £31,999Top Director SellsValue and Income Trust (VIN) Director name: Mr Matthew A OakeshottAmount sold: 100,000 @ 267.00p Value: £267,000Royal Bank of Scotland Group (RBS) Director name: Mr Ewen StevensonAmount sold: 20,000 @ 392.26p Value: £78,452Euromoney Institutional Investor (ERM) Director name: Mr Bashar AL-RehanyAmount sold: 1,000 @ 1,017.00p Value: £10,170