Item 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Foreign currency exchange risk

Our revenue, earnings, cash flows, receivables, and payables are subject to fluctuations due to changes in foreign currency exchange rates. Our risk management strategy utilizes foreign currency contracts to manage our exposure to foreign currency volatility that exists as part of our ongoing business operations. We utilize cash flow hedge contracts to reduce the exchange rate impact on a portion of the net revenue or operating expense of certain anticipated transactions. In addition, we use balance sheet hedge contracts to reduce the exchange rate risk associated primarily with foreign currency denominated receivables and payables. As of January 31, 2018, and 2017, we had open cash flow and balance sheet hedge contracts with future settlements within one to twelve months. Contracts were primarily denominated in euros, Japanese yen, Swiss francs, British pounds, Canadian dollars, and Australian dollars. We do not enter into foreign exchange derivative instruments for trading or speculative purposes. The notional amount of our option and forward contracts was $949.5 million and $640.0 million at January 31, 2018, and 2017, respectively.

We use foreign currency contracts to reduce the exchange rate impact on the net revenue and operating expenses of certain anticipated transactions. A sensitivity analysis performed on our hedging portfolio as of January 31, 2018, indicated that a hypothetical 10% appreciation of the U.S. dollar from its value at January 31, 2018 and 2017 would increase the fair value of our foreign currency contracts by $57.9 million and $60.9 million, respectively. A hypothetical 10% depreciation of the dollar from its value at January 31, 2018, and 2017 would decrease the fair value of our foreign currency contracts by $83.2 million and $32.5 million, respectively.

Interest Rate Risk

Interest rate movements affect both the interest income we earn on our short-term investments and the market value of certain longer term securities. At January 31, 2018, we had $1,078.6 million of cash equivalents and marketable securities, including $245.2 million classified as short-term marketable securities and $190.8 million classified as long-term marketable securities. If interest rates were to move up by 50 or 100 basis points over a twelve month period, the market value change of our marketable securities would have an unrealized gain or loss of $1.4 million and $2.8 million, respectively.

Other Market Risk

From time to time we make direct investments in privately held companies. Privately held company investments generally are considered inherently risky. The technologies and products these companies have under development are typically in the early stages and may never materialize, which could result in a loss of all or a substantial part of our initial investment in these companies. The evaluation of privately held companies is based on information that we request from these companies, which is not subject to the same disclosure regulations as U.S. publicly traded companies, and as such, the basis for these evaluations is subject to the timing and accuracy of the data received from these companies. See Note 2, "Financial Instruments" for further discussion regarding our privately held investments.

2018 Form 10-K 61