Yes, the staff of securities companies can buy funds and bonds, but they can't speculate in stocks. Because securities staff generally have high academic qualifications and a solid professional foundation, they are easier to obtain information than ordinary investors and are easy to involve insider trading, so they are not allowed to invest in the stock market.
According to the relevant regulations of the state, armed police, servicemen, securities practitioners, fund practitioners and cadres at or above the department level of state organs are not allowed to participate in stock trading.