. principal transactions revenue decreased from the prior year , reflecting lower private equity gains in corporate driven by lower valuation gains and lower net gains on sales as the firm exits this non-core business . the decrease was partially offset by higher client-driven market-making revenue , particularly in foreign exchange , interest rate and equity-related products in cib , as well as a gain of approximately $ 160 million on ccb 2019s investment in square , inc . upon its initial public offering