4. CONCENTRATIONS

Granite Falls Energy

GFE sold all of the ethanol, distillers’ grains, and corn oil produced at its plant to two customers under marketing agreements during the fiscal years ended October 31, 2017, 2016, and 2015.

The percentage of GFE’s total revenues attributable to each of its two major customers for the fiscal years ended October 31, 2017, 2016, and 2015 were as follows:


	October 31, 2017	October 31, 2016	October 31, 2015
Eco-Energy, Inc. - Ethanol	81.8%	80.3%	79.1%
RPMG, Inc. - Distillers' Grains & Corn Oil	17.8%	19.7%	20.7%

The percentage of GFE’s total accounts receivable attributable to each of its two major customers at October 31, 2017 and 2016 were as follows:


	October 31, 2017	October 31, 2016
Eco-Energy, Inc. - Ethanol	82.0%	70.2%
RPMG, Inc. - Distillers' Grains & Corn Oil	16.3%	26.5%

Heron Lake BioEnergy

HLBE sold all of the ethanol, distillers’ grains, and corn oil produced at its plant to three customers under marketing agreements during the fiscal years ended October 31, 2017, 2016, and 2015.

The percentage of HLBE’s total revenues attributable to each of HLBE’s three major customers for the fiscal years ended October 31, 2017, 2016, and 2015 were as follows:


	October 31, 2017	October 31, 2016	October 31, 2015
Eco-Energy, Inc. - Ethanol	81.3%	78.5%	76.9%
Gavilon Ingredients, LLC - Distillers' Grains	13.7%	15.4%	19.2%
RPMG, Inc. - Corn Oil	4.5%	4.4%	2.4%

The percentage of HLBE’s total accounts receivable attributable to each of HLBE’s three major customers at October 31, 2017 and 2016 were as follows:


	October 31, 2017	October 31, 2016
Eco-Energy, Inc. - Ethanol	86.8%	78.6%
Gavilon Ingredients, LLC - Distillers' Grains	7.0%	11.1%
RPMG, Inc. - Corn Oil	4.3%	3.3%