Saxo ESMA Retail clients are only able to use cash as collateral for margin trading.
For clients, classified as Professionals Saxo Bank allows a percentage of the investment in certain Stocks, ETFs and Bonds to be used as collateral for margin trading activities. The collateral value of a stock, ETF or bond position depends on the rating of the individual stocks, ETFs or bonds.
You can find the collateral values for stocks and ETFs here and the collateral values for bonds here.
You can find the risk rating of an instrument in the trading conditions under Instrument.