Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION

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STOCK-BASED COMPENSATION
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
STOCK-BASED COMPENSATION STOCK-BASED COMPENSATION
We issue share-based awards under various incentive compensation plans, including non-qualified and incentive stock options, stock appreciation rights, restricted stock and stock units ("RSUs") and restricted performance shares and performance units ("RPUs", collectively with RSUs, "Restricted Units"). Upon vesting, Restricted Units result in the issuance of the equivalent number of UPS class A common shares after required tax withholdings. Dividends accrued on Restricted Units are reinvested in additional Restricted Units at each dividend payable date and are subject to the same vesting and forfeiture conditions as the underlying Restricted Units upon which they are earned.
Our primary equity compensation programs are the UPS Management Incentive Award program (the "MIP"), the UPS Long-Term Incentive Performance Award program (the "LTIP") and the UPS Stock Option program. We also maintain an employee stock purchase plan which allows eligible employees to purchase shares of UPS class A common stock at a discount. Additionally, our matching contributions to our primary employee defined contribution savings plan are made in shares of UPS class A common stock.
Management Incentive Award Program ("MIP")
RPUs issued under the MIP vest one year following the grant date based on continued employment with the Company (except in the case of death, disability or retirement, in which case immediate vesting occurs). The grant value is expensed on a straight-line basis (less estimated forfeitures) over the requisite service period (except in the case of death, disability or retirement, in which case immediate expensing occurs).
Based on the date of Compensation Committee approval of the 2020 MIP award, we determined the award measurement dates to be February 10, 2021 (for U.S.-based employees and executive management) and March 22, 2021 (for international employees). The RPUs issued under the MIP were valued for stock compensation expense purposes using the closing New York Stock Exchange ("NYSE") prices of $165.66 and $161.06 on those dates.
Long-Term Incentive Performance Award Program ("LTIP")
RPUs issued under the LTIP vest at the end of a three-year performance period, assuming continued employment with the Company (except in the case of death, disability or retirement, in which case immediate vesting occurs on a prorated basis). The final number of RPUs earned is based on achievement of the performance targets established on the grant date.
For LTIP awards with a performance period ending December 31, 2021, the performance targets are equally weighted among consolidated operating return on invested capital ("ROIC"), growth in currency-constant consolidated revenue and total shareholder return ("RTSR") relative to a peer group of companies. For the two-thirds of the award related to ROIC and growth in currency-constant consolidated revenue, we recognize the grant date fair value of these RPUs (less estimated forfeitures) as compensation expense ratably over the vesting period, based on the number of awards expected to be earned. The remaining one-third of the award is valued using a Monte Carlo model. We recognize the grant date fair value of this portion of the award (less estimated forfeitures) as compensation expense ratably over the vesting period.
For LTIP awards with a performance period ending in 2022 or later, the performance targets are equally weighted between adjusted earnings per share and adjusted cumulative free cash flow. The final number of RPUs earned will then be subject to adjustment based on RTSR relative to the Standard & Poors 500 Index ("S&P 500"). We determine the grant date fair value of the RPUs using a Monte Carlo model and recognize compensation expense (less estimated forfeitures) ratably over the vesting period, based on the number of awards expected to be earned.
For the 2020 LTIP award, the performance period was divided into two measurement periods. The first measurement period evaluated the achievement of the performance targets for 2020. The second measurement period will evaluate the achievement of the performance targets for the years 2021 and 2022. The performance targets for the second measurement period were approved on March 25, 2021 and the target RPUs awarded were valued at $167.66 on that date.
Based on the date of Compensation Committee approval of the 2021 LTIP award performance targets, we determined March 25, 2021 to be the award measurement date and the target RPUs awarded were valued at $166.52.
The weighted-average assumptions used and the weighted-average fair values of the LTIP awards granted in 2021 and 2020 are as follows:
2021 2020
Risk-free interest rate 0.19  % 0.15  %
Expected volatility 30.70  % 27.53  %
Weighted-average fair value of RPUs granted $ 167.26  $ 92.77 
Share payout 102.40  % 101.00  %
There is no expected dividend yield as units earn dividend equivalents.
Non-Qualified Stock Options
We grant non-qualified stock options to a limited group of eligible senior management employees under the UPS Stock Option program. Stock option awards vest over a five-year period with approximately 20% of the award vesting at each anniversary of the grant date (except in the case of death, disability or retirement, in which case immediate vesting occurs). The option grants expire 10 years after the date of the grant. In the first quarter of 2021, we granted 0.2 million stock options at a grant price of $165.66, which was the NYSE closing price on February 10, 2021.
The fair value of each option grant is estimated using the Black-Scholes option pricing model. The weighted-average assumptions used and the weighted-average fair values of options granted in 2021 and 2020 are as follows:
2021 2020
Expected dividend yield 3.31  % 3.51  %
Risk-free interest rate 0.84  % 1.26  %
Expected life (in years) 7.5 7.5
Expected volatility 23.15  % 19.25  %
Weighted-average fair value of options granted $ 23.71  $ 11.74 
Pre-tax compensation expense for share-based awards recognized in "Compensation and benefits" on the statements of consolidated income for the three months ended June 30, 2021 and 2020 was $206 and $137 million, respectively, and for the
six months ended June 30, 2021 and 2020 was $521 and $368 million, respectively.