Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2016
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited interim financial statements for Xencor, Inc. (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of the Company believes are necessary for a fair presentation of the periods presented. The preparation of interim financial statements requires the use of management’s estimates and assumptions that affect reported amounts of assets and liabilities at the date of the interim financial statements and the reported revenues and expenditures during the reported periods. These interim financial results are not necessarily indicative of the results expected for the full fiscal year or for any subsequent interim period. The accompanying unaudited interim financial statements and related notes should be read in conjunction with the audited financial statements and notes thereto included in the Company’s 2015 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on March 8, 2016. Marketable Securities The Company has an investment policy that includes guidelines on acceptable investment securities, minimum credit quality, maturity parameters and concentration and diversification. The Company invests its excess cash primarily in marketable securities issued by investment grade institutions. The Company considers its marketable securities to be available-for-sale. These assets are carried at fair value and the unrealized gains and losses are included in accumulated other comprehensive income (loss). Accrued interest on marketable securities is included in marketable securities. If a decline in the value of a marketable security in the Company’s investment portfolio is deemed to be other-than-temporary, the Company writes down the security to its current fair value and recognizes a loss as a charge against income. The Company reviews its portfolio of marketable securities, using both quantitative and qualitative factors, to determine if declines in fair value below cost are other-than-temporary. Recent Accounting Pronouncements In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting,” which amends the current stock compensation guidance. The amendments simplify the accounting for the taxes related to stock based compensation, including adjustments to how excess tax benefits and a company's payments for tax withholdings should be classified. The standard is effective for fiscal periods beginning after December 15, 2016, with early adoption permitted. In April 2016, the FASB issued ASU No. 2016-10 “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” which amends and clarifies the revenue recognition guidance on accounting for licenses of intellectual property (IP) and identifying performance obligations. The amendment clarifies how an entity should evaluate the nature of its promise in granting a license of IP which will determine whether it recognizes revenue over time or at a point in time and also clarifies when a promised good or service is separately identifiable, which is an important step in determining whether goods or services should be accounted for as separate performance obligations. The amendment has the same effective date as the new revenue recognition standard which is for fiscal periods after December 15, 2017. The Company is currently evaluating the impact of the adoption of the new accounting pronouncements on its financial statements and related disclosures. There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2015 Annual Report on Form 10-K.

1. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited interim financial statements for Xencor, Inc. (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information. The financial statements include all adjustments (consisting only of normal recurring adjustments) that the management of the Company believes are necessary for a fair presentation of the periods presented. The preparation of interim financial statements requires the use of management’s estimates and assumptions that affect reported amounts of assets and liabilities at the date of the interim financial statements and the reported revenues and expenditures during the reported periods. These interim financial results are not necessarily indicative of the results expected for the full fiscal year or for any subsequent interim period.

The accompanying unaudited interim financial statements and related notes should be read in conjunction with the audited financial statements and notes thereto included in the Company’s 2015 Annual Report on Form 10-K filed with the Securities and Exchange Commission (SEC) on March 8, 2016.

Marketable Securities

The Company has an investment policy that includes guidelines on acceptable investment securities, minimum credit quality, maturity parameters and concentration and diversification. The Company invests its excess cash primarily in marketable securities issued by investment grade institutions.

The Company considers its marketable securities to be available-for-sale. These assets are carried at fair value and the unrealized gains and losses are included in accumulated other comprehensive income (loss). Accrued interest on marketable securities is included in marketable securities. If a decline in the value of a marketable security in the Company’s investment portfolio is deemed to be other-than-temporary, the Company writes down the security to its current fair value and recognizes a loss as a charge against income. The Company reviews its portfolio of marketable securities, using both quantitative and qualitative factors, to determine if declines in fair value below cost are other-than-temporary.

Recent Accounting Pronouncements

In March 2016, the FASB issued ASU No. 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting,” which amends the current stock compensation guidance. The amendments simplify the accounting for the taxes related to stock based compensation, including adjustments to how excess tax benefits and a company's payments for tax withholdings should be classified. The standard is effective for fiscal periods beginning after December 15, 2016, with early adoption permitted.

In April 2016, the FASB issued ASU No. 2016-10 “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” which amends and clarifies the revenue recognition guidance on accounting for licenses of intellectual property (IP) and identifying performance obligations. The amendment clarifies how an entity should evaluate the nature of its promise in granting a license of IP which will determine whether it recognizes revenue over time or at a point in time and also clarifies when a promised good or service is separately identifiable, which is an important step in determining whether goods or services should be accounted for as separate performance obligations. The amendment has the same effective date as the new revenue recognition standard which is for fiscal periods after December 15, 2017.

The Company is currently evaluating the impact of the adoption of the new accounting pronouncements on its financial statements and related disclosures.

There have been no other material changes to the significant accounting policies previously disclosed in the Company’s 2015 Annual Report on Form 10-K.