(ShareCast News) - Johnson Matthey´s finance chief bought 2,184 shares of the speciality chemicals maker at an individual price of 3,818p, the company said in a statement.Anna Manz carried out the purchase on 24 November spending a total £69,470.03 in the process.On 17 November, the outfit said first half pre-tax profits fell 36% to £210m on revenues of £5.6bn, down 2%.Underlying pre-tax profits on the other hand rose 5% to £219.6m.The company´s boss, Robert MacLeod, said the firm had a "solid first half, supported by favourable exchange rates, and our health and safety performance improved".In a research note published the next day, analysts at Deutsche Bank said that with the shares trading on 15 times´ their 2017/18 price-to-earnings multiple they saw "the structural growth as undervalued and have a BUY."Top Director BuysHelical (HLCL)Director name: Kaye,Gerald AAmount purchased: 34,825 @ 287.14pValue: £99,996.51Helical (HLCL)Director name: Murphy,TimAmount purchased: 34,825 @ 287.14pValue: £99,996.51Johnson Matthey (JMAT)Director name: Manz,Anna Amount purchased: 2,184 @ 3,180.86pValue: £69,470.03Helical (HLCL)Director name: Bonning-Snook,MatthewAmount purchased: 17,350 @ 287.14pValue: £49,818.79Charles Taylor (CTR)Director name: Hewitt,PaulAmount purchased: 18,724 @ 255.00pValue: £47,746.20Barratt Developments (BDEV)Director name: Lennox,Jock FyfeAmount purchased: 10,000 @ 472.38pValue: £47,238.00Safestyle Uk (SFE)Director name: Richardson,PeterAmount purchased: 15,620 @ 256.00pValue: £39,987.20Devro (DVO)Director name: Hoetmer ,Gerard Amount purchased: 20,000 @ 160.00pValue: £32,000.00Helical (HLCL)Director name: Walker,DuncanAmount purchased: 3,661 @ 271.75pValue: £9,948.77Firstgroup (FGP)Director name: O'Toole,TimAmount purchased: 7,723 @ 102.40pValue: £7,908.35Law Debenture Corp. (LWDB)Director name: Bridgeman,MarkAmount purchased: 1,120 @ 528.00pValue: £5,913.60Helical (HLCL)Director name: Walker,DuncanAmount purchased: 1,795 @ 277.16pValue: £4,975.02Helical (HLCL)Director name: Walker,DuncanAmount purchased: 1,778 @ 279.75pValue: £4,973.95Helical (HLCL)Director name: Walker,DuncanAmount purchased: 1,817 @ 273.68pValue: £4,972.77Mission Marketing Group (TMMG)Director name: Andrew Day,Robert Amount purchased: 11,600 @ 41.95pValue: £4,866.20Charles Taylor (CTR)Director name: Hewitt,PaulAmount purchased: 784 @ 252.00pValue: £1,975.68Sky (SKY)Director name: Gilbert,Martin JAmount purchased: 132 @ 761.50pValue: £1,005.18Sky (SKY)Director name: Pigasse,MatthieuAmount purchased: 130 @ 761.50pValue: £989.95Sky (SKY)Director name: Sukawaty,Andrew (Andy)Amount purchased: 126 @ 761.50pValue: £959.49Sky (SKY)Director name: Clarke,Tracy JayneAmount purchased: 82 @ 761.50pValue: £624.43Firstgroup (FGP)Director name: Barker,MickAmount purchased: 596 @ 102.40pValue: £610.30Homeserve (HSV)Director name: Harpin,RichardAmount purchased: 85 @ 589.00pValue: £500.65Spirent Communications (SPT)Director name: Hutchinson,Eric GAmount purchased: 314 @ 79.47pValue: £249.54Helical (HLCL)Director name: O'Donnell,MichaelAmount purchased: 5,000 @ 2.81pValue: £140.50