Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.

Text: five-year performance comparison 2013 the following graph provides an indicator of cumulative total shareholder returns for the corporation as compared to the peer group index ( described above ) , the dj trans , and the s&p 500 . the graph assumes that $ 100 was invested in the common stock of union pacific corporation and each index on december 31 , 2012 and that all dividends were reinvested . the information below is historical in nature and is not necessarily indicative of future performance . purchases of equity securities 2013 during 2017 , we repurchased 37122405 shares of our common stock at an average price of $ 110.50 . the following table presents common stock repurchases during each month for the fourth quarter of 2017 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares remaining under the plan or program [b] . <table class='wikitable'><tr><td>1</td><td>period</td><td>total number of shares purchased [a]</td><td>average price paid per share</td><td>total number of shares purchased as part of a publicly announcedplan or program [b]</td><td>maximum number of shares remaining under the plan or program [b]</td></tr><tr><td>2</td><td>oct . 1 through oct . 31</td><td>3831636</td><td>$ 113.61</td><td>3800000</td><td>89078662</td></tr><tr><td>3</td><td>nov . 1 through nov . 30</td><td>3005225</td><td>117.07</td><td>2937410</td><td>86141252</td></tr><tr><td>4</td><td>dec . 1 through dec . 31</td><td>2718319</td><td>130.76</td><td>2494100</td><td>83647152</td></tr><tr><td>5</td><td>total</td><td>9555180</td><td>$ 119.58</td><td>9231510</td><td>n/a</td></tr></table> [a] total number of shares purchased during the quarter includes approximately 323670 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares . [b] effective january 1 , 2017 , our board of directors authorized the repurchase of up to 120 million shares of our common stock by december 31 , 2020 . these repurchases may be made on the open market or through other transactions . our management has sole discretion with respect to determining the timing and amount of these transactions. .
Question: what portion of total number of shares purchased during the fourth quarter of 2007?
Answer: 0.401
Question: what is the number of shares attested to upc by employees to pay stock option exercise prices during the last quarter of 2017?
Answer: 323670.0
Question: wha about the total number of shares purchased during the fourth quarter of 2017?
Answer: 9555180.0
Question: what portion does this represent?

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