each of these segments is organized and managed based upon the nature of the products and services they offer . see item 1. business for additional information on our segments . refining & marketing – refines crude oil and other feedstocks at our seven refineries in the gulf coast and midwest regions of the united states , purchases refined products and ethanol for resale and distributes refined products through various means , including barges , terminals and trucks that we own or operate . we sell refined products to wholesale marketing customers domestically and internationally , buyers on the spot market , our speedway business segment and to independent entrepreneurs who operate marathon ® retail outlets . speedway – sells transportation fuels and convenience products in the retail market in the midwest , east coast and southeast . midstream – includes the operations of mplx and certain other related operations . following the markwest merger , we changed the name of this segment from pipeline transportation to midstream to reflect its expanded business activities . there were no changes to the historical financial information reported for this segment . the midstream segment gathers , processes and transports natural gas ; gathers , transports , fractionates , stores and markets natural gas liquids and transports and stores crude oil and refined products . 50 executive summary results select results for 2015 and 2014 are reflected in the following table . replace_table_token_25_th net income attributable to mpc increased $ 328 million , or $ 0.87 per diluted share , in 2015 compared to 2014 , primarily due to our refining & marketing segment . refining & marketing segment income from operations increased in 2015 compared to 2014 , primarily due to higher crack spreads , favorable effects of changes in market structure on crude oil acquisition prices , more favorable net product price realizations compared to spot market reference prices and lower direct operating costs . these positive impacts were partially offset by unfavorable crude oil and feedstock acquisition costs relative to benchmark lls crude oil , the unfavorable effect of lower commodity prices on volumetric gains and a lower of cost or market ( “ lcm ” ) inventory valuation charge of $ 345 million . speedway segment income from operations increased in 2015 compared to 2014 , primarily due to the full year benefit in 2015 from the financial results of the locations acquired along the east coast and southeast on september 30 , 2014 , as well as higher light product margin . midstream segment income from operations increased in 2015 compared to 2014 , primarily due to the financial results of markwest , which are reflected in midstream segment income from the december 4 , 2015 merger date , partially offset by $ 30 million of merger transaction costs . mplx lp mplx is a publicly traded master limited partnership that was formed by us to own , operate , develop and acquire pipelines and other midstream assets related to the transportation and storage of crude oil , refined products and other hydrocarbon-based products . on december 4 , 2015 , mplx merged with markwest , whereby markwest became a wholly-owned subsidiary of mplx . prior to the markwest merger , we owned a 71.5 percent interest in mplx , which included our two percent general partner interest . each common unit of markwest issued and outstanding at the time of the markwest merger was converted into the right to receive 1.09 common units of mplx and as of december 31 , 2015 , our ownership interest in mplx was 20.4 percent , including our two percent general partner interest . due to our general partner interest , we have determined that we control mplx and therefore we consolidate mplx and record a noncontrolling interest for the 79.6 percent interest owned by the public . upon completion of the markwest merger , mplx assumed an aggregate principal amount of $ 4.1 billion in senior notes issued by markwest and markwest energy finance corporation . on december 22 , 2015 , mplx completed offers to exchange any and all outstanding markwest senior notes for ( 1 ) up to $ 4.1 billion aggregate principal amount of new notes issued by mplx having the same maturity and interest rates as the markwest senior notes and ( 2 ) cash of $ 1 for each $ 1,000 of principal amount exchanged . as of december 31 , 2015 , the exchange was completed on all the markwest senior notes except for 1.6 percent , or $ 63 million . in addition , markwest 's existing credit facility was terminated and the approximately $ 943 million outstanding under markwest 's bank revolving credit facility was repaid with $ 850 million of borrowings under mplx 's bank revolving credit facility and $ 93 million in cash . mplx 's initial assets consisted of a 51 percent general partner interest in pipe line holdings , which owns a network of common carrier crude oil and product pipeline systems and associated storage assets in the midwest and gulf coast regions of the united states , and a 100 percent interest in a butane storage cavern in west virginia . we originally retained a 49 percent limited partner interest in pipe line holdings . 51 on may 1 , 2013 , we sold a five percent interest in pipe line holdings to mplx for $ 100 million , which was financed by mplx with cash on hand . on march 1 , 2014 , we sold a 13 percent interest in pipe line holdings to mplx for $ 310 million . mplx financed this transaction with $ 40 million of cash on-hand and $ 270 million of borrowings on its bank revolving credit facility . story_separator_special_tag at december 31 , 2015 , market values for these inventories , which totaled approximately 4.0 billion gallons , were lower than their lifo cost basis and , as a result , we recorded an inventory valuation charge of $ 345 million to cost of revenues to value these inventories at the lower of cost or market . based on movements of refined product prices , future inventory valuation adjustments could have a negative or positive effect to earnings . such losses are subject to reversal in subsequent periods if prices recover . in 2016 , inventory market values have continued to decline and if they do not recover to december 31 , 2015 levels by march 31 , 2016 , an additional inventory valuation charge would be required in first quarter 2016. in the fourth quarter 2015 , we recorded a lifo charge of $ 45 million as a result of decreased levels in refined products and crude inventory volumes . since the lifo costs for these layers were based on 2014 costs , the liquidation of these layers resulted in a charge to income . in the fourth quarter of 2014 , we recognized builds in our refined product and crude inventories . these builds were based on 2014 costs which were significantly higher than fourth quarter 2014 costs and resulted in a benefit of approximately $ 240 million to income . for the full year , we recognized a lifo charge of $ 78 million in 2015 as compared to a lifo benefit of $ 265 million in 2014 . 55 refining & marketing segment income from operations is also affected by changes in refinery direct operating costs , which include turnaround and major maintenance , depreciation and amortization and other manufacturing expenses . changes in manufacturing costs are primarily driven by the cost of energy used by our refineries , including purchased natural gas , and the level of maintenance costs . planned major maintenance activities , or turnarounds , requiring temporary shutdown of certain refinery operating units , are periodically performed at each refinery . the following table lists the refineries that had significant planned turnaround and major maintenance activities for each of the last three years . year refinery 2015 catlettsburg , galveston bay , garyville and robinson 2014 catlettsburg , galveston bay , garyville and robinson 2013 canton , catlettsburg , galveston bay , garyville and robinson the table below sets forth the location and daily crude oil refining capacity of each of our refineries at december 31 of each year . replace_table_token_28_th speedway our retail marketing gross margin for gasoline and distillate , which is the price paid by consumers less the cost of refined products , including transportation , consumer excise taxes and bankcard processing fees , impacts the speedway segment profitability . numerous factors impact gasoline and distillate demand throughout the year , including local competition , seasonal demand fluctuations , the available wholesale supply , the level of economic activity in our marketing areas and weather conditions . gasoline demand in padd 2 is estimated to have grown for the third consecutive year , increasing by 2.3 percent in 2015 and approaching 2007 levels after climbing by 0.5 percent in 2014. meanwhile , gasoline demand in padd 1 is estimated to have grown by 3.0 percent in 2015 after a 2.4 percent increase in 2014 , returning to 2010 levels . continuing economic growth and year-on-year declines in prices supported gasoline demand . distillate demand in 2015 was softer than the very strong levels in 2014 which were supported by severe winter temperatures and a very strong harvest season . padd 2 distillate demand is estimated to have declined by 2.8 percent in 2015 after climbing by 4.3 percent to a record level in 2014. despite this decline , padd 2 demand is estimated to have remained near pre-recession highs . padd 1 estimated distillate demand declined 1.1 percent for 2016 with unseasonably warm weather in november and december after climbing by 4.9 percent in 2014. market demand increases for gasoline and distillate generally increase the product margin we can realize . the gross margin on merchandise sold at convenience stores historically has been less volatile and has contributed substantially to speedway 's gross margin . more than half of speedway 's gross margin was derived from merchandise sales in 2015 . speedway 's convenience stores offer a wide variety of merchandise , including prepared foods , beverages and non-food items . inventories are stated at the lower of cost or market . at december 31 , 2015 , market values for refined product inventories were lower than their lifo cost basis and , as a result , we recorded an inventory valuation charge of $ 25 million to cost of revenues to value these inventories at the lower of cost or market . based on movements of refined product prices , future inventory valuation adjustments could have a negative or positive effect to earnings . such losses are subject to reversal in subsequent periods if prices recover . in 2016 , inventory market values have continued to decline and if they do not recover to december 31 , 2015 levels by march 31 , 2016 , an additional inventory valuation charge would be required in first quarter 2016. midstream 56 ngl and natural gas prices are volatile and are impacted by changes in fundamental supply and demand , as well as market uncertainty , availability of ngl transportation and fractionation capacity and a variety of additional factors that are beyond our control . our profitability is directly affected by prevailing commodity prices primarily as a result of processing or conditioning at our own or third‑party processing plants , purchasing and selling or gathering and transporting volumes of natural gas at index‑related prices and the cost of third‑party transportation and fractionation services . to the extent that commodity prices influence the level of natural gas drilling by our producer

cash flows our cash and cash equivalents balance was $ 1.13 billion at december 31 , 2015 compared to $ 1.49 billion at december 31 , 2014 . net cash provided by ( used in ) operating activities , investing activities and financing activities for the past three years is presented in the following table . replace_table_token_41_th net cash provided by operating activities increased $ 951 million in 2015 compared to 2014 , primarily due to increased operating results , excluding non-cash charges such as the lcm inventory valuation charge and roux project impairment , partially offset by unfavorable changes in working capital of $ 330 million compared to 2014 . net cash provided by operating activities decreased $ 295 million in 2014 compared to 2013 , primarily due to unfavorable changes in working capital of $ 892 million compared to 2013 , partially offset by an increase in net income of $ 422 million and non-cash adjustments of $ 175 million . the above changes in working capital exclude changes in short-term debt . for 2015 , changes in working capital were a net $ 1.02 billion use of cash , primarily due to a decrease in accounts payable and accrued liabilities , partially offset by decreases in current receivables and inventories . changes from december 31 , 2014 to december 31 , 2015 per the consolidated balance sheets , excluding the impact of acquisitions , were as follows : accounts payable decreased $ 1.92 billion from year-end 2014 , primarily due to lower crude oil payable prices and volumes . current receivables decreased $ 1.13 billion from year-end 2014 , primarily due to lower refined product and crude oil receivable prices and lower crude oil receivable volumes . inventories decreased $ 417 million from year-end 2014 , primarily due to a $ 370 million lcm inventory valuation charge and lower refined product and crude oil inventory volumes .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```cash flows our cash and cash equivalents balance was $ 1.13 billion at december 31 , 2015 compared to $ 1.49 billion at december 31 , 2014 . net cash provided by ( used in ) operating activities , investing activities and financing activities for the past three years is presented in the following table . replace_table_token_41_th net cash provided by operating activities increased $ 951 million in 2015 compared to 2014 , primarily due to increased operating results , excluding non-cash charges such as the lcm inventory valuation charge and roux project impairment , partially offset by unfavorable changes in working capital of $ 330 million compared to 2014 . net cash provided by operating activities decreased $ 295 million in 2014 compared to 2013 , primarily due to unfavorable changes in working capital of $ 892 million compared to 2013 , partially offset by an increase in net income of $ 422 million and non-cash adjustments of $ 175 million . the above changes in working capital exclude changes in short-term debt . for 2015 , changes in working capital were a net $ 1.02 billion use of cash , primarily due to a decrease in accounts payable and accrued liabilities , partially offset by decreases in current receivables and inventories . changes from december 31 , 2014 to december 31 , 2015 per the consolidated balance sheets , excluding the impact of acquisitions , were as follows : accounts payable decreased $ 1.92 billion from year-end 2014 , primarily due to lower crude oil payable prices and volumes . current receivables decreased $ 1.13 billion from year-end 2014 , primarily due to lower refined product and crude oil receivable prices and lower crude oil receivable volumes . inventories decreased $ 417 million from year-end 2014 , primarily due to a $ 370 million lcm inventory valuation charge and lower refined product and crude oil inventory volumes .
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 Suspicious Activity Report : each of these segments is organized and managed based upon the nature of the products and services they offer . see item 1. business for additional information on our segments . refining & marketing – refines crude oil and other feedstocks at our seven refineries in the gulf coast and midwest regions of the united states , purchases refined products and ethanol for resale and distributes refined products through various means , including barges , terminals and trucks that we own or operate . we sell refined products to wholesale marketing customers domestically and internationally , buyers on the spot market , our speedway business segment and to independent entrepreneurs who operate marathon ® retail outlets . speedway – sells transportation fuels and convenience products in the retail market in the midwest , east coast and southeast . midstream – includes the operations of mplx and certain other related operations . following the markwest merger , we changed the name of this segment from pipeline transportation to midstream to reflect its expanded business activities . there were no changes to the historical financial information reported for this segment . the midstream segment gathers , processes and transports natural gas ; gathers , transports , fractionates , stores and markets natural gas liquids and transports and stores crude oil and refined products . 50 executive summary results select results for 2015 and 2014 are reflected in the following table . replace_table_token_25_th net income attributable to mpc increased $ 328 million , or $ 0.87 per diluted share , in 2015 compared to 2014 , primarily due to our refining & marketing segment . refining & marketing segment income from operations increased in 2015 compared to 2014 , primarily due to higher crack spreads , favorable effects of changes in market structure on crude oil acquisition prices , more favorable net product price realizations compared to spot market reference prices and lower direct operating costs . these positive impacts were partially offset by unfavorable crude oil and feedstock acquisition costs relative to benchmark lls crude oil , the unfavorable effect of lower commodity prices on volumetric gains and a lower of cost or market ( “ lcm ” ) inventory valuation charge of $ 345 million . speedway segment income from operations increased in 2015 compared to 2014 , primarily due to the full year benefit in 2015 from the financial results of the locations acquired along the east coast and southeast on september 30 , 2014 , as well as higher light product margin . midstream segment income from operations increased in 2015 compared to 2014 , primarily due to the financial results of markwest , which are reflected in midstream segment income from the december 4 , 2015 merger date , partially offset by $ 30 million of merger transaction costs . mplx lp mplx is a publicly traded master limited partnership that was formed by us to own , operate , develop and acquire pipelines and other midstream assets related to the transportation and storage of crude oil , refined products and other hydrocarbon-based products . on december 4 , 2015 , mplx merged with markwest , whereby markwest became a wholly-owned subsidiary of mplx . prior to the markwest merger , we owned a 71.5 percent interest in mplx , which included our two percent general partner interest . each common unit of markwest issued and outstanding at the time of the markwest merger was converted into the right to receive 1.09 common units of mplx and as of december 31 , 2015 , our ownership interest in mplx was 20.4 percent , including our two percent general partner interest . due to our general partner interest , we have determined that we control mplx and therefore we consolidate mplx and record a noncontrolling interest for the 79.6 percent interest owned by the public . upon completion of the markwest merger , mplx assumed an aggregate principal amount of $ 4.1 billion in senior notes issued by markwest and markwest energy finance corporation . on december 22 , 2015 , mplx completed offers to exchange any and all outstanding markwest senior notes for ( 1 ) up to $ 4.1 billion aggregate principal amount of new notes issued by mplx having the same maturity and interest rates as the markwest senior notes and ( 2 ) cash of $ 1 for each $ 1,000 of principal amount exchanged . as of december 31 , 2015 , the exchange was completed on all the markwest senior notes except for 1.6 percent , or $ 63 million . in addition , markwest 's existing credit facility was terminated and the approximately $ 943 million outstanding under markwest 's bank revolving credit facility was repaid with $ 850 million of borrowings under mplx 's bank revolving credit facility and $ 93 million in cash . mplx 's initial assets consisted of a 51 percent general partner interest in pipe line holdings , which owns a network of common carrier crude oil and product pipeline systems and associated storage assets in the midwest and gulf coast regions of the united states , and a 100 percent interest in a butane storage cavern in west virginia . we originally retained a 49 percent limited partner interest in pipe line holdings . 51 on may 1 , 2013 , we sold a five percent interest in pipe line holdings to mplx for $ 100 million , which was financed by mplx with cash on hand . on march 1 , 2014 , we sold a 13 percent interest in pipe line holdings to mplx for $ 310 million . mplx financed this transaction with $ 40 million of cash on-hand and $ 270 million of borrowings on its bank revolving credit facility . story_separator_special_tag at december 31 , 2015 , market values for these inventories , which totaled approximately 4.0 billion gallons , were lower than their lifo cost basis and , as a result , we recorded an inventory valuation charge of $ 345 million to cost of revenues to value these inventories at the lower of cost or market . based on movements of refined product prices , future inventory valuation adjustments could have a negative or positive effect to earnings . such losses are subject to reversal in subsequent periods if prices recover . in 2016 , inventory market values have continued to decline and if they do not recover to december 31 , 2015 levels by march 31 , 2016 , an additional inventory valuation charge would be required in first quarter 2016. in the fourth quarter 2015 , we recorded a lifo charge of $ 45 million as a result of decreased levels in refined products and crude inventory volumes . since the lifo costs for these layers were based on 2014 costs , the liquidation of these layers resulted in a charge to income . in the fourth quarter of 2014 , we recognized builds in our refined product and crude inventories . these builds were based on 2014 costs which were significantly higher than fourth quarter 2014 costs and resulted in a benefit of approximately $ 240 million to income . for the full year , we recognized a lifo charge of $ 78 million in 2015 as compared to a lifo benefit of $ 265 million in 2014 . 55 refining & marketing segment income from operations is also affected by changes in refinery direct operating costs , which include turnaround and major maintenance , depreciation and amortization and other manufacturing expenses . changes in manufacturing costs are primarily driven by the cost of energy used by our refineries , including purchased natural gas , and the level of maintenance costs . planned major maintenance activities , or turnarounds , requiring temporary shutdown of certain refinery operating units , are periodically performed at each refinery . the following table lists the refineries that had significant planned turnaround and major maintenance activities for each of the last three years . year refinery 2015 catlettsburg , galveston bay , garyville and robinson 2014 catlettsburg , galveston bay , garyville and robinson 2013 canton , catlettsburg , galveston bay , garyville and robinson the table below sets forth the location and daily crude oil refining capacity of each of our refineries at december 31 of each year . replace_table_token_28_th speedway our retail marketing gross margin for gasoline and distillate , which is the price paid by consumers less the cost of refined products , including transportation , consumer excise taxes and bankcard processing fees , impacts the speedway segment profitability . numerous factors impact gasoline and distillate demand throughout the year , including local competition , seasonal demand fluctuations , the available wholesale supply , the level of economic activity in our marketing areas and weather conditions . gasoline demand in padd 2 is estimated to have grown for the third consecutive year , increasing by 2.3 percent in 2015 and approaching 2007 levels after climbing by 0.5 percent in 2014. meanwhile , gasoline demand in padd 1 is estimated to have grown by 3.0 percent in 2015 after a 2.4 percent increase in 2014 , returning to 2010 levels . continuing economic growth and year-on-year declines in prices supported gasoline demand . distillate demand in 2015 was softer than the very strong levels in 2014 which were supported by severe winter temperatures and a very strong harvest season . padd 2 distillate demand is estimated to have declined by 2.8 percent in 2015 after climbing by 4.3 percent to a record level in 2014. despite this decline , padd 2 demand is estimated to have remained near pre-recession highs . padd 1 estimated distillate demand declined 1.1 percent for 2016 with unseasonably warm weather in november and december after climbing by 4.9 percent in 2014. market demand increases for gasoline and distillate generally increase the product margin we can realize . the gross margin on merchandise sold at convenience stores historically has been less volatile and has contributed substantially to speedway 's gross margin . more than half of speedway 's gross margin was derived from merchandise sales in 2015 . speedway 's convenience stores offer a wide variety of merchandise , including prepared foods , beverages and non-food items . inventories are stated at the lower of cost or market . at december 31 , 2015 , market values for refined product inventories were lower than their lifo cost basis and , as a result , we recorded an inventory valuation charge of $ 25 million to cost of revenues to value these inventories at the lower of cost or market . based on movements of refined product prices , future inventory valuation adjustments could have a negative or positive effect to earnings . such losses are subject to reversal in subsequent periods if prices recover . in 2016 , inventory market values have continued to decline and if they do not recover to december 31 , 2015 levels by march 31 , 2016 , an additional inventory valuation charge would be required in first quarter 2016. midstream 56 ngl and natural gas prices are volatile and are impacted by changes in fundamental supply and demand , as well as market uncertainty , availability of ngl transportation and fractionation capacity and a variety of additional factors that are beyond our control . our profitability is directly affected by prevailing commodity prices primarily as a result of processing or conditioning at our own or third‑party processing plants , purchasing and selling or gathering and transporting volumes of natural gas at index‑related prices and the cost of third‑party transportation and fractionation services . to the extent that commodity prices influence the level of natural gas drilling by our producer

