Laxey Partners has claimed Alliance trust is "terrified" to reveal its total expense ratio to shareholders in its latest swipe at the trust.
Brewin Dolphin held crisis talks with Alliance Trust last week as it called for the company to initiate further share buybacks to tighten its wide discount.
Alliance Trust has slipped out of the FTSE 100, while wealth manager Hargreaves Lansdown has been promoted to the blue chip index.
Laxey Partners has sent out a letter to Alliance Trust shareholders arguing for the introduction of share buybacks if the trust's discount to net asset value exceeds 10%.
Laxey Partners has stepped up its fight against Alliance Trust, creating a shareholder action group website in a bid to build support for a discount control mechanism set at 10%.
Alliance Trust has placed new managers on its Asia Pacific Equity and Japan Equity funds in a bid to boost performance.