Exhibit

Exhibit 99.1

Beginning with the first quarter of 2019, Aegion Corporation (“Aegion”) will report corporate expenses separately rather than allocating those expenses to Aegion’s operating segments. Set forth below is a presentation of certain components of Aegion’s previously-reported operating results for the quarters and year-to-date reporting periods in 2018, conformed to reflect this alternative reporting method.

Segment Reporting

(in thousands)



	Quarter Ended March 31, 2018
	As Reported (GAAP)			Adjustments ₍₁₎		As Adjusted (Non-GAAP)
Revenues:
Infrastructure Solutions	$	134,427		$	—	$	134,427
Corrosion Protection	98,105			—		98,105
Energy Services	92,329			—		92,329
Total Revenues	$	324,861		$	—	$	324,861

Gross Profit:
Infrastructure Solutions	$	26,709		—		$	26,709
Gross Profit Margin	19.9		%			19.9		%
Corrosion Protection	23,576			—		23,576
Gross Profit Margin	24.0		%			24.0		%
Energy Services	11,219			—		11,219
Gross Profit Margin	12.2		%			12.2		%
Total Gross Profit	$	61,504		—		$	61,504
Gross Profit Margin	18.9		%			18.9		%

Operating Income (Loss):
Infrastructure Solutions	$	3,237		$	3,239	$	6,476
Operating Margin	2.3		%			4.8		%
Corrosion Protection	4,962			1,497		6,459
Operating Margin	5.0		%			6.6		%
Energy Services	3,127			—		3,127
Operating Margin	3.3		%			3.3		%
Corporate	(8,145		)	900		(7,245		)
Total Operating Income	$	3,181		$	5,636	$	8,817
Operating Margin	1.0		%			2.7		%

_________________________________


⁽¹⁾	Includes non-GAAP adjustments related to:

Infrastructure Solutions - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs and other restructuring charges; and (ii) acquisition and divestiture expenses.

Corrosion Protection - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs and other restructuring charges; and (ii) expenses incurred in connection with the acquisition of Hebna and divestiture of the Bayou business.

Corporate - (i) pre-tax restructuring charges primarily associated with severance and benefit related costs and legal expenses; and (ii) acquisition and divestiture expenses.

Segment Reporting

(in thousands)



	Quarter Ended June 30, 2018								Six Months Ended June 30, 2018
	As Reported (GAAP)			Adjustments ₍₁₎		As Adjusted (Non-GAAP)			As Reported (GAAP)			Adjustments ₍₂₎		As Adjusted (Non-GAAP)
Revenues:
Infrastructure Solutions	$	160,732		$	—	$	160,732		$	295,159		$	—	$	295,159
Corrosion Protection	96,389			—		96,389			194,494			—		194,494
Energy Services	77,909			—		77,909			170,238			—		170,238
Total Revenues	$	335,030		$	—	$	335,030		$	659,891		$	—	$	659,891

Gross Profit:
Infrastructure Solutions	$	35,949		$	—	$	35,949		$	62,658		—		$	62,658
Gross Profit Margin	22.4		%			22.4		%	21.2		%			21.2		%
Corrosion Protection	24,537			—		24,537			48,113			—		48,113
Gross Profit Margin	25.5		%			25.5		%	24.7		%			24.7		%
Energy Services	10,567			—		10,567			21,786			—		21,786
Gross Profit Margin	13.6		%			13.6		%	12.8		%			12.8		%
Total Gross Profit	$	71,053		$	—	$	71,053		$	132,557		—		$	132,557
Gross Profit Margin	21.2		%			21.2		%	20.1		%			20.1		%

Operating Income (Loss):
Infrastructure Solutions	$	12,916		$	2,747	$	15,663		$	16,153		$	5,986	$	22,139
Operating Margin	8.0		%			9.7		%	2.3		%			4.8		%
Corrosion Protection	6,953			469		7,422			11,915			1,966		13,881
Operating Margin	7.2		%			7.7		%	5.0		%			6.6		%
Energy Services	2,498			—		2,498			5,625			—		5,625
Operating Margin	3.2		%			3.2		%	3.3		%			3.3		%
Corporate	(7,908		)	529		(7,379		)	(16,053		)	1,429		(14,624		)
Total Operating Income	$	14,459		$	3,745	$	18,204		$	17,640		$	9,381	$	27,021
Operating Margin	4.3		%			5.4		%	2.7		%			4.1		%

_________________________________


⁽¹⁾	Includes non-GAAP adjustments related to:

Infrastructure Solutions - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, fixed asset disposals and other restructuring charges; and (ii) expenses incurred in connection with the planned divestiture of the CIPP business in Australia.

Corporate - (i) pre-tax restructuring charges primarily associated with legal expenses; and (ii) acquisition and divestiture expenses.


⁽²⁾	Includes non-GAAP adjustments related to:

Corporate - (i) pre-tax restructuring charges primarily associated with severance and benefit related costs and legal expenses; and (ii) acquisition and divestiture expenses.

Segment Reporting

(in thousands)



	Quarter Ended September 30, 2018								Nine Months Ended September 30, 2018
	As Reported (GAAP)			Adjustments ₍₁₎		As Adjusted (Non-GAAP)			As Reported (GAAP)			Adjustments ₍₂₎		As Adjusted (Non-GAAP)
Revenues:
Infrastructure Solutions	$	155,681		$	—	$	155,681		$	450,840		$	—	$	450,840
Corrosion Protection	105,624			—		105,624			300,118			—		300,118
Energy Services	78,374			—		78,374			248,612			—		248,612
Total Revenues	$	339,679		$	—	$	339,679		$	999,570		$	—	$	999,570

Gross Profit:
Infrastructure Solutions	$	38,135		$	138	$	38,273		$	100,793		138		$	100,931
Gross Profit Margin	24.5		%			24.6		%	22.4		%			22.4		%
Corrosion Protection	26,411			567		26,978			74,524			567		75,091
Gross Profit Margin	25.0		%			25.5		%	24.8		%			25.0		%
Energy Services	8,127			—		8,127			29,913			—		29,913
Gross Profit Margin	10.4		%			10.4		%	12.0		%			12.0		%
Total Gross Profit	$	72,673		$	705	$	73,378		$	205,230		705		$	205,935
Gross Profit Margin	21.4		%			21.6		%	20.5		%			20.6		%

Operating Income (Loss):
Infrastructure Solutions	$	13,088		$	6,039	$	19,127		$	29,241		$	12,025	$	41,266
Operating Margin	8.4		%			12.3		%	2.3		%			4.8		%
Corrosion Protection	8,299			2,634		10,933			20,214			4,600		24,814
Operating Margin	7.9		%			10.4		%	5.0		%			6.6		%
Energy Services	456			—		456			6,081			—		6,081
Operating Margin	0.6		%			0.6		%	3.3		%			3.3		%
Corporate	(8,834		)	3,328		(5,506		)	(24,887		)	4,757		(20,130		)
Total Operating Income	$	13,009		$	12,001	$	25,010		$	30,649		$	21,382	$	52,031
Operating Margin	3.8		%			7.4		%	3.1		%			5.2		%

_________________________________


⁽¹⁾	Includes non-GAAP adjustments related to:

Infrastructure Solutions - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, fixed asset disposals, goodwill and definite-lived intangible asset impairments and other restructuring charges; and (ii) expenses incurred in connection with the planned divestitures of the CIPP businesses in Australia and Denmark.

Corrosion Protection - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, inventory obsolescence and other restructuring charges; and (ii) expenses incurred in connection with the acquisition of Hebna and divestiture of the Bayou business.

Corporate - (i) pre-tax restructuring charges primarily associated with legal expenses; and (ii) acquisition and divestiture expenses.


⁽²⁾	Includes non-GAAP adjustments related to:

Infrastructure Solutions - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, fixed asset disposals, goodwill and definite-lived intangible asset impairments and other restructuring charges; and (ii) expenses incurred in connection with the planned divestitures of the CIPP businesses in Australia and Denmark.

Corporate - (i) pre-tax restructuring charges primarily associated with severance and benefit related costs and legal expenses; and (ii) acquisition and divestiture expenses.

Segment Reporting

(in thousands)



	Quarter Ended December 31, 2018								Year Ended December 31, 2018
	As Reported (GAAP)			Adjustments ₍₁₎		As Adjusted (Non-GAAP)			As Reported (GAAP)			Adjustments ₍₂₎		As Adjusted (Non-GAAP)
Revenues:
Infrastructure Solutions	$	153,281		$	—	$	153,281		$	604,121		$	—	$	604,121
Corrosion Protection	93,622			—		93,622			393,740			—		393,740
Energy Services	87,095			—		87,095			335,707			—		335,707
Total Revenues	$	333,998		$	—	$	333,998		$	1,333,568		$	—	$	1,333,568

Gross Profit:
Infrastructure Solutions	$	31,618		$	1,143	$	32,761		$	132,411		1,281		$	133,692
Gross Profit Margin	20.6		%			21.4		%	21.9		%			22.1		%
Corrosion Protection	18,444			2,822		21,266			92,968			3,389		96,357
Gross Profit Margin	19.7		%			22.7		%	23.6		%			24.5		%
Energy Services	11,634			—		11,634			41,547			—		41,547
Gross Profit Margin	13.4		%			13.4		%	12.4		%			12.4		%
Total Gross Profit	$	61,696		$	3,965	$	65,661		$	266,926		4,670		$	271,596
Gross Profit Margin	18.5		%			19.7		%	20.0		%			20.4		%

Operating Income (Loss):
Infrastructure Solutions	$	8,268		$	4,459	$	12,727		$	37,509		$	16,484	$	53,993
Operating Margin	5.4		%			8.3		%	2.3		%			4.8		%
Corrosion Protection	(3,931		)	8,222		4,291			16,283			12,822		29,105
Operating Margin	(4.2		)%			4.6		%	5.0		%			6.6		%
Energy Services	3,557			262		3,819			9,638			262		9,900
Operating Margin	4.1		%			4.4		%	3.3		%			3.3		%
Corporate	(8,896		)	984		(7,912		)	(33,783		)	5,741		(28,042		)
Total Operating Income (Loss)	$	(1,002	)	$	13,927	$	12,925		$	29,647		$	35,309	$	64,956
Operating Margin	(0.3		)%			3.9		%	2.2		%			4.9		%

_________________________________


⁽¹⁾	Includes non-GAAP adjustments related to:

Infrastructure Solutions - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, fixed asset disposals and other restructuring charges; and (ii) expenses incurred in connection with the divestiture of the CIPP business in Denmark and the planned divestiture of the CIPP business in Australia.

Corrosion Protection - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, inventory write-offs, definite-lived intangible asset impairments and other restructuring charges; (ii) non-cash charges related to estimates for inventory obsolescence; and (iii) expenses incurred in connection with the divestiture of the Bayou business.

Energy Services - pre-tax restructuring charges associated with severance and benefit related costs and other restructuring charges.

Corporate - (i) pre-tax restructuring charges primarily associated with legal expenses; and (ii) acquisition and divestiture expenses.


⁽²⁾	Includes non-GAAP adjustments related to:

Infrastructure Solutions - (i) pre-tax restructuring charges associated with severance and benefit related costs, early lease and contract termination costs, fixed asset disposals, goodwill and definite-lived intangible asset impairments and other restructuring charges; and (ii) expenses incurred in connection with the divestiture of the CIPP business in Denmark and the planned divestiture of the CIPP business in Australia.

Energy Services - pre-tax restructuring charges associated with severance and benefit related costs and other restructuring charges.

Corporate - (i) pre-tax restructuring charges primarily associated with severance and benefit related costs and legal expenses; and (ii) acquisition and divestiture expenses.