Due to heightening concerns of investors over identify theft, Charles Schwab & Co. is giving its investors a guarantee that it will cover 100% of losses having to do with unauthorized activity in investors' online brokerage accounts, according to MarketWatch.com.

The firm's "public promise" comes at a time when incidences of hacking into online brokerage accounts are common.

"Given rising public concerns over identity theft and cyber-fraud, we think adding a clear and simple guarantee will contribute to even greater peace of mind for our clients," said Charles Schwab, founder and CEO of the firm.

Approximately half of the firm's seven million clients conduct business via the Internet, and so the guarantee will affect a majority of Schwab investors.

Ameritrade and Fidelity Investments are among other firms that have a heavy load of online transactions.

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