Goldman Sachs is doing something the bank hasn't done since before the global financial crisis: it's raising a leveraged buyout fund.

Long after Goldman's competitors jettisoned private equity teams and hedge funds, the most profitable bank on Wall Street is raising between $5 billion and $8 billion to do take-privates — and all under a brand other than Goldman's, according to a Wall Street Journal report. Leveraged buyout funds acquire companies using large amounts of borrowed money, or leverage.