As part of regulators’ increasing scrutiny of mutual fund sales and trading practices, the Securities and Exchange Commission is now investigating whether 15 leading brokerage firms pushed certain mutual funds in return for trade orders, The Wall Street Journal reports. Morgan Stanley is one of the firms being investigated, the paper discovered from a filing with the SEC.

A Morgan Stanley spokeswoman confirmed that the SEC has contacted the firm on this matter and said the firm is cooperating with regulators. The firm also revealed that it has a so-called "partner list" of 14 fund companies whose funds it would give preferential treatment to due to higher commissions, according to The Journal.

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