Djerriwarrh seeks shelter from turbulence DJERRIWARRH Investments plans to increase put option coverage on its $1 billion Australian stocks portfolio if there are further rises in the market as it seeks protection against subdued economic conditions. With public companies struggling to grow revenue and share prices driven higher by yield-hungry investors, Djerriwarrh managing director Ross Barker said he wanted to enhance returns for the fund through the use of options that generate income and protect against falls in the share price.