Stocks making the biggest moves after hours: Qualtrics, W.R. Berkley, Discover Financial and more

The companies make news after the bell.

Discover Financial reported weaker-than- expected earnings for the recent quarter and said that it expects operating expenses to rise more than previously anticipated.

The software firm's shares rose 1.6% after it raised its full-year earnings per share guidance. The company posted earnings of $1.06 a share, beating the estimate of 96 cents.

The company beat analysts' expectations on top and bottom lines for the recent quarter, and raised its guidance.

The New York Post reported that Amazon is freezing hiring in its Amazon Web Services division.

After revenue for the recent quarter failed to meet Wall Street's estimates, shares of Packaging Corp of America fell in extended trading. On an adjusted basis, the packaging products maker posted a small beat.

After Zions Bancorporations reported earnings per share that fell short of expectations, shares of the banking company plummeted.

W.R. Berkley Corp. reported a decline in net income and earnings per share. The company's net investment losses and expenses increased.