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The fair value of RSUs, MSUs and PSUs approximates the closing trading price of BMS's common stock on the grant date after adjusting for the units not eligible for accrued dividends. In addition, the fair value of MSUs and PSUs considers the probability of satisfying the payout factor and total shareholder return, respectively. 

The fair value of the replacement RSUs approximates the closing trading price of BMS' common stock on the date of acquisition after adjusting for the units not eligible for accrued dividends. The fair value on the acquisition date attributable to post-combination service, adjusted for estimated forfeitures, is recognized as expense on a straight-line basis over the remaining vesting period. 

The following table summarizes significant outstanding and exercisable options at December 31, 2019: 

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The aggregate intrinsic value in the preceding table represents the total pretax intrinsic value, based on the closing stock price of $64.19 on December 31, 2019. 

## Note 19. LEGAL PROCEEDINGS AND CONTINGENCIES 

BMS and certain of its subsidiaries are involved in various lawsuits, claims, government investigations and other legal proceedings that arise in the ordinary course of business. These claims or proceedings can involve various types of parties, including governments, competitors, customers, suppliers, service providers, licensees, employees, or shareholders, among others. These matters may involve patent infringement, antitrust, securities, pricing, sales and marketing practices, environmental, commercial, contractual rights, licensing obligations, health and safety matters, consumer fraud, employment matters, product liability and insurance coverage, among others. The resolution of these matters often develops over a long period of time and expectations can change as a result of new findings, rulings, appeals or settlement arrangements. Legal proceedings that are significant or that BMS believes could become significant or material are described below. 

