Simple explanation: The value of shares in the overall portfolio drops until the broker is not comfortable and needs a cash top-up. If $ is not forthcoming, they will liquidate until they are comfortable with the risk level.
He pledged the shares to CGS as collateral at certain value
Since the share price cui and further cui and cui, CGS need to ensure the collateral is still valid… sorry, this my noob explanation
He pledged his shares as collateral for a margin facility in order to take a loan.
The loan can be drawn either as a cash withdrawal or used to purchase more shares.
The amount of loan he can take depends on the value of his collateral — the higher the valuation, the larger the loan; the lower the valuation, the smaller the loan.
As the value of his MM2 shares declined, so his loan should be lesser now
therefore his broker required him to either top up with more MM2 shares, pledge other quality shares, or return the loan by cash.
Since he was unable to do so, he now has to sell his MM2 shares to raise cash and repay the loan.
so nothing is wrong with mm2 company