Financial stocks swung to losses in premarket trade Friday, after a big miss in the May jobs report sent Treasury yields lower, which could weigh on bank profits. The SPDR Financial Select Sector ETF fell 0.4% in premarket trade, after being up 0.3% just before the data was released. Among the ETF's most heavily weighted components, shares of J.P. Morgan Chase & Co. fell 0.7% after being up 0.3% just before the data; Bank of America Corp. swung to a loss of 1.0% after being up 0.3%; Citigroup Inc. dropped 1.1% after being up 0.3%; and Wells Fargo & Co. lost 0.7%, after gaining less than 0.1%. The yield on the 10-year Treasury note fell 3.9 basis points toward a 21-month low of 2.084%. Lower longer-term interest rates could hurt bank profits, as it could narrow the spread between what the banks make on longer-term assets, such as loans, and the costs of shorter-term liabilities. Meanwhile, futures for the Dow Jones Industrial Average inched up 4 points.