it really depends on the nature of the company: whether its primary business is securities trading or carry on a business which is other than securities trading. If the company is not trading securities as its main business (for example, a handbag manufacturer manufactures handbags as its ordinary course of business, and it is merely holding securties and selling them later), gain or loss is not realized until the securities are sold. In other word, no gain or loss (P/L) entry is need until the securities are sold. The journal entries should be like this as below:

Year end of year 1

DR. SECURITIES INVESTMENT (BS) $10,000
    CR. CASH & BANK (BS)                                   $10,000

YEAR END of year 2:

DR. Cash              25,000
    CR. securities                 10,000
    CR  Other income (P&L)  15,000

This should be the lastest, please correct me if I am wrong : )

So what should be the correct jornal entries?