Item 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES.

Since September 7, 2018, UAL's common stock has traded on the Nasdaq Global Select Market ("Nasdaq") under the symbol "UAL." Previously, UAL's common stock was traded on the New York Stock Exchange ("NYSE"). As of February 22, 2019, there were 5,615 holders of record of UAL common stock.

The following graph shows the cumulative total stockholder return for UAL's common stock during the period from December 31, 2013 to December 31, 2018. The graph also shows the cumulative returns of the Standard and Poor's 500 Index ("SPX") and the NYSE Arca Airline Index ("XAL") of 15 investor-owned airlines over the same five-year period. The comparison assumes $100 was invested on December 31, 2013 in each of UAL common stock, the SPX and the XAL.

Note: The stock price performance shown in the graph above should not be considered indicative of potential future stock price performance. The foregoing performance graph is being furnished as part of this report solely in accordance with the requirement under Rule 14a-3(b)(9) to furnish our stockholders with such information, and therefore, shall not be deemed to be filed or incorporated by reference into any filings by the Company under the Securities Act or the Exchange Act.

The following table presents repurchases of UAL common stock made in the fourth quarter of 2018:

(a) In 2018, UAL repurchased approximately 17.5 million shares of UAL common stock for $1.2 billion. In December 2017, UAL's Board of Directors authorized a $3.0 billion share repurchase program to acquire UAL's common stock. As of December 31, 2018, the Company had approximately $1.8 billion remaining to purchase shares under its share repurchase program. UAL may repurchase shares through the open market, privately negotiated transactions, block trades or accelerated share repurchase transactions from time to time in accordance with applicable securities laws.

(b) The table does not include shares withheld from employees to satisfy certain tax obligations due upon the vesting of restricted stock. The United Continental Holdings, Inc. 2017 Incentive Compensation Plan and the United Continental Holdings, Inc. 2008 Incentive Compensation Plan, each provide for the withholding of shares to satisfy tax obligations due upon the vesting of restricted stock. However, these plans do not specify a maximum number of shares that may be withheld for this purpose. A total of 1,368 shares were withheld under the plans in the fourth quarter of 2018 at an average price of $91.79 per share. These shares of common stock withheld to satisfy tax withholding obligations may be deemed to be "issuer purchases" of shares that are required to be disclosed pursuant to this Item.

(c) Average price paid per share is calculated on a settlement basis and excludes commission.