Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of ~~October 29, 2020, 64,970,532~~July 28, 2021, 65,657,699 shares of the Registrant’s Common Stock, par value $.0001 per share, were outstanding.

	September 30,			December 31,			June 30,		December 31,
	2020			2019			2021		2020
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	229,725		$	186,995		$	180,767	$	216,510
Accounts receivable—net		47,218			19,785			35,741		38,990
Contract revenues in excess of billings		20,588			22,560			34,556		32,106
Inventories		32,980			30,189			32,758		34,689
Prepaid expenses and other current assets		34,220			41,183			39,330		40,398
Total current assets		364,731			300,712			323,152		362,693

PROPERTY AND EQUIPMENT—Net		372,847			374,596			422,552		383,042
OPERATING LEASE ASSETS		66,148			72,612			52,777		65,188
GOODWILL		76,576			76,576			76,576		76,576
INVENTORIES—Noncurrent		61,416			61,126			61,578		58,413
ASSETS HELD FOR SALE— Noncurrent		3,970			3,970
OTHER		8,777			7,960			12,998		12,112
TOTAL	$	954,465		$	897,552		$	949,633	$	958,024

LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Accounts payable	$	79,312		$	76,091		$	79,863	$	71,308
Accrued expenses		52,112			51,225			37,230		52,899
Operating lease liabilities		19,019			21,351			14,255		19,472
Billings in excess of contract revenues		38,154			55,266			28,833		32,608
Total current liabilities		188,597			203,933			160,181		176,287

LONG-TERM DEBT		323,512			322,843			320,696		323,735
OPERATING LEASE LIABILITIES—Noncurrent		47,280			51,131			38,877		45,879
DEFERRED INCOME TAXES		53,299			35,740			59,458		56,466
OTHER		8,878			4,506			10,324		8,989
Total liabilities		621,566			618,153			589,536		611,356

COMMITMENTS AND CONTINGENCIES (Note 8)
EQUITY:
Common stock—$.0001 par value; 90,000 authorized, 64,645 and 64,283 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively.		6			6
Common stock—$.0001 par value; 90,000 authorized, 65,654 and 65,023 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively.								6		6
Additional paid-in capital		305,070			302,189			304,977		304,757
Retained earnings (accumulated deficit)		30,335			(23,091	)
Accumulated other comprehensive income (loss)		(2,512	)		295
Retained earnings								51,856		40,937
Accumulated other comprehensive income								3,258		968
Total equity		332,899			279,399			360,097		346,668
TOTAL	$	954,465		$	897,552		$	949,633	$	958,024

	Three Months Ended						Nine Months Ended
	September 30,						September 30,						Three Months Ended						Six Months Ended
	2020			2019			2020			2019			June 30,						June 30,
													2021			2020			2021			2020
Contract revenues	$	175,841		$	169,775		$	561,456		$	547,223		$	169,914		$	167,920		$	347,547		$	385,615
Costs of contract revenues		139,490			137,942			423,615			428,027			146,992			134,904			291,549			284,125
Gross profit		36,351			31,833			137,841			119,196			22,922			33,016			55,998			101,490
General and administrative expenses		14,888			13,488			45,263			42,926			14,224			14,804			30,546			30,375
Proceeds from loss of use claim		(1,723	)		—			(1,723	)		—
(Gain) loss on sale of assets—net		—			(27	)		(184	)		333
Gain on sale of assets—net														(138	)		(39	)		(32	)		(184	)
Operating income		23,186			18,372			94,485			75,937			8,836			18,251			25,484			71,299
Interest expense—net		(6,719	)		(6,335	)		(20,074	)		(21,074	)		(6,657	)		(6,725	)		(13,243	)		(13,355	)
Other income (expense)		156			(22	)		(400	)		273			755			565			896			(556	)
Income from continuing operations before income taxes		16,623			12,015			74,011			55,136
Income before income taxes														2,934			12,091			13,137			57,388
Income tax provision		(4,076	)		(3,204	)		(18,517	)		(14,280	)		(829	)		(3,131	)		(2,218	)		(14,441	)
Income from continuing operations		12,547			8,811			55,494			40,856
Loss from discontinued operations, net of income taxes		—			(859	)		—			(7,490	)
Net income	$	12,547		$	7,952		$	55,494		$	33,366		$	2,105		$	8,960		$	10,919		$	42,947

Basic earnings per share attributable to continuing operations	$	0.19		$	0.14		$	0.86		$	0.64
Basic loss per share attributable to discontinued operations, net of tax		—			(0.02	)		—			(0.12	)
Basic earnings per share	$	0.19		$	0.12		$	0.86		$	0.52		$	0.03		$	0.14		$	0.17		$	0.66
Basic weighted average shares		64,860			63,861			64,726			63,449			65,646			64,864			65,458			64,659

Diluted earnings per share attributable to continuing operations	$	0.19		$	0.14		$	0.84		$	0.63
Diluted loss per share attributable to discontinued operations, net of tax		—			(0.02	)		—			(0.12	)
Diluted earnings per share	$	0.19		$	0.12		$	0.84		$	0.51		$	0.03		$	0.14		$	0.16		$	0.65
Diluted weighted average shares		65,894			65,071			65,861			64,860			66,137			65,758			66,187			65,802

	Three Months Ended					Nine Months Ended					Three Months Ended				Six Months Ended
	September 30,					September 30,					June 30,				June 30,
	2020		2019			2020			2019		2021		2020		2021		2020

Net income	$	12,547	$	7,952		$	55,494		$	33,366	$	2,105	$	8,960	$	10,919	$	42,947
Net unrealized (gain) loss on derivatives—net of tax (1)		879		(160	)		(2,807	)		2,817
Net change in cash flow derivative hedges—net of tax (1)												404		3,440		2,290		(3,686	)
Comprehensive income	$	13,426	$	7,792		$	52,687		$	36,183	$	2,509	$	12,400	$	13,209	$	39,261

															Retained			Accumulated													Retained			Accumulated
	Shares of					Shares of						Additional			Earnings			Other						Shares of				Additional			Earnings			Other
	Common			Common		Treasury			Treasury			Paid-In			(Accumulated			Comprehensive						Common		Common		Paid-In			(Accumulated			Comprehensive
	Stock			Stock		Stock			Stock			Capital			Deficit)			Income (Loss)			Total			Stock		Stock		Capital			Deficit)			Income (Loss)			Total
BALANCE—January 1, 2021																									65,023	$	6	$	304,757		$	40,937		$	968		$	346,668

Share-based compensation																									73		-		2,564			-			-			2,564
Vesting of restricted stock units and impact of shares withheld for taxes																									410		-		(3,784	)		-			-			(3,784	)
Exercise of options and purchases from employee stock plans																									148		-		1,440			-			-			1,440
Net income																									-		-		-			10,919			-			10,919
Other comprehensive income—net of tax																									-		-		-			-			2,290			2,290
BALANCE—June 30, 2021																									65,654	$	6	$	304,977		$	51,856		$	3,258		$	360,097

BALANCE—January 1, 2020		64,283		$	6		—		$	—		$	302,189		$	(23,091	)	$	295		$	279,399			64,283	$	6	$	302,189		$	(23,091	)	$	295		$	279,399

Share-based compensation		80			—		—			—			4,891			—			—			4,891			61		-		3,130			-			-			3,130
Vesting of restricted stock units and impact of shares withheld for taxes		432			—		—			—			(2,174	)		—			—			(2,174	)		412		-		(2,106	)		-			-			(2,106	)
Exercise of options and purchases from employee stock plans		275			—		—			—			1,956			—			—			1,956			191		-		1,318			-			-			1,318
Repurchase of common stock		(425	)		—		—			—			(1,792	)		(2,068	)		—			(3,860	)
Net income		—			—		—			—			—			55,494			—			55,494			-		-		-			42,947			-			42,947
Other comprehensive loss—net of tax		—			—		—			—			—			—			(2,807	)		(2,807	)		-		-		-			-			(3,686	)		(3,686	)
BALANCE—September 30, 2020		64,645		$	6		—		$	—		$	305,070		$	30,335		$	(2,512	)	$	332,899

BALANCE—January 1, 2019		62,830		$	6		(278	)	$	(1,433	)	$	295,135		$	(74,971	)	$	(3,809	)	$	214,928

Cumulative effect of recent accounting pronouncements		—			—		—			—			—			2,802			—			2,802
Share-based compensation		60			—		—			—			6,720			—			—			6,720
Vesting of restricted stock units and impact of shares withheld for taxes		605			—		—			—			(3,164	)		—			—			(3,164	)
Exercise of options and purchases from employee stock plans		699			—		—			—			4,355			—			—			4,355
Cancellation of treasury stock		(278	)		—		278			1,433			(1,173	)		(261	)		—			—
Net income		—			—		—			—			—			33,366			—			33,366
Other comprehensive income—net of tax		—			—		—			—			—			—			2,817			2,817
BALANCE—September 30, 2019		63,916		$	6		—		$	—		$	301,874		$	(39,064	)	$	(992	)	$	261,824
BALANCE—June 30, 2020																									64,947	$	6	$	304,531		$	19,856		$	(3,391	)	$	321,002

															Retained			Accumulated																Accumulated
	Shares of					Shares of						Additional			Earnings			Other						Shares of				Additional						Other
	Common			Common		Treasury			Treasury			Paid-In			(Accumulated			Comprehensive						Common		Common		Paid-In			Retained			Comprehensive
	Stock			Stock		Stock			Stock			Capital			Deficit)			Income (Loss)			Total			Stock		Stock		Capital			Earnings			Income (Loss)			Total

BALANCE—July 1, 2020		64,947		$	6		—		$	—		$	304,531		$	19,856		$	(3,391	)	$	321,002

Share-based compensation		19			—		—			—			1,761			—			—			1,761
Vesting of restricted stock units and impact of shares withheld for taxes		20			—		—			—			(68	)		—			—			(68	)
Exercise of options and purchases from employee stock plans		84			—		—			—			638			—			—			638
Repurchase of common stock		(425	)		—								(1,792	)		(2,068	)		—			(3,860	)
Net income		—			—		—			—			—			12,547			—			12,547
Other comprehensive income—net of tax		—			—		—			—			—			—			879			879
BALANCE—September 30, 2020		64,645		$	6		—		$	—		$	305,070		$	30,335		$	(2,512	)	$	332,899

BALANCE—July 1, 2019		63,769		$	6		—		$	—		$	299,320		$	(47,016	)	$	(832	)	$	251,478
BALANCE—March 31, 2021																									65,620	$	6	$	303,999		$	49,751		$	2,854		$	356,610

Share-based compensation		15			—		—			—			2,190			—			—			2,190			12		-		798			-			-			798
Vesting of restricted stock units and impact of shares withheld for taxes		51			—		—			—			(235	)		—			—			(235	)		-		-		-			-			-			-
Exercise of options and purchases from employee stock plans		81			—		—			—			599			—			—			599			22		-		180			-			-			180
Net income		—			—		—			—			—			7,952			—			7,952			-		-		-			2,105			-			2,105
Other comprehensive loss—net of tax		—			—		—			—			—			—			(160	)		(160	)
BALANCE—September 30, 2019		63,916		$	6		—		$	—		$	301,874		$	(39,064	)	$	(992	)	$	261,824
Other comprehensive income—net of tax																									-		-								404			404
BALANCE—June 30, 2021																									65,654	$	6	$	304,977		$	51,856		$	3,258		$	360,097

BALANCE—March 31, 2020																									64,795	$	6	$	302,558		$	10,896		$	(6,831	)	$	306,629

Share-based compensation																									22		-		1,455			-			-			1,455
Vesting of restricted stock units and impact of shares withheld for taxes																									24		-		(178	)		-			-			(178	)
Exercise of options and purchases from employee stock plans																									106		-		696			-			-			696
Net income																									-		-		-			8,960			-			8,960
Other comprehensive income—net of tax																									-		-		-			-			3,440			3,440
BALANCE—June 30, 2020																									64,947	$	6	$	304,531		$	19,856		$	(3,391	)	$	321,002

	Nine Months Ended						Six Months Ended
	September 30,						June 30,
							2021			2020
OPERATING ACTIVITIES:
Net income							$	10,919		$	42,947
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation and amortization								20,681			18,707
Deferred income taxes								2,218			14,441
Gain on sale of assets								(32	)		(184	)
Amortization of deferred financing fees								1,715			805
Share-based compensation expense								2,564			3,130
Changes in assets and liabilities:
Accounts receivable								3,249			(14,109	)
Contract revenues in excess of billings								(2,450	)		2,123
Inventories								(1,233	)		(4,733	)
Prepaid expenses and other current assets								4,131			10,733
Accounts payable and accrued expenses								(2,668	)		(8,229	)
Billings in excess of contract revenues								(3,775	)		(179	)
Other noncurrent assets and liabilities								282			2,008
Cash provided by operating activities								35,601			67,460

INVESTING ACTIVITIES:
Purchases of property and equipment								(64,828	)		(21,076	)
Proceeds from dispositions of property and equipment								223			936
Cash used in investing activities								(64,605	)		(20,140	)
	2020			2019
FINANCING ACTIVITIES:
Deferred financing fees		—			(2,388	)		(4,395	)		-
Taxes paid on settlement of vested share awards		(2,174	)		(3,164	)		(3,784	)		(2,106	)
Exercise of options and purchases from employee stock plans		1,956			4,355			1,440			1,318
Repurchase of common stock		(3,860	)		—
Repayments of revolving loans		—			(11,500	)
Net cash flows used in financing activities of continuing operations		(4,078	)		(12,697	)
Net cash flows used in financing activities of discontinued operations		—			(191	)
Cash used in financing activities		(4,078	)		(12,888	)		(6,739	)		(788	)
Net increase in cash, cash equivalents and restricted cash		42,730			146,397
Net (decrease) increase in cash, cash equivalents and restricted cash								(35,743	)		46,532
Cash, cash equivalents and restricted cash at beginning of period		186,995			34,458			216,510			186,995
Cash, cash equivalents and restricted cash at end of period	$	229,725		$	180,855		$	180,767		$	233,527

Supplemental Cash Flow Information
Cash paid for interest	$	12,659		$	12,396		$	13,984		$	12,548
Cash paid for income taxes	$	385		$	344		$	332		$	175

Non-cash Investing and Financing Activities
Property and equipment purchased but not yet paid	$	2,958		$	4,455		$	11,139		$	4,608

The unaudited condensed consolidated financial statements and notes herein should be read in conjunction with the audited consolidated financial statements of Great Lakes Dredge & Dock Corporation and Subsidiaries (the “Company” or “Great Lakes”) and the notes thereto, included in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2019.~~2020. The condensed consolidated financial statements included herein have been prepared by the Company without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the SEC’s rules and regulations, although management believes that the disclosures are adequate and make the information presented not misleading. In the opinion of management, all adjustments, which are of a normal and recurring nature (except as otherwise noted), that are necessary to present fairly the Company’s financial position as of ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019,~~2020, and its results of operations for the three and ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 and ~~2019~~2020 and cash flows for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 and ~~2019~~2020 have been included.

On March 27, 2020, the U.S. government enacted the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”). The CARES Act is an emergency economic stimulus package in response to the coronavirus (COVID-19) pandemic which, among other things, includes various tax provisions relating to refundable payroll tax credits, deferment of the employer side of certain payroll taxes and social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. The Company has elected to defer the employer side of certain payroll taxes and is continually assessing the financial impact of these tax-related changes. As of September 30, 2020, the Company has not been significantly impacted by COVID-19 but the uncertainty that surrounds this virus means that the Company must continue to monitor and assess any potential future impact on the Company’s business, financial condition and results of operations.

The components of costs of contract revenues include labor, equipment (including depreciation, maintenance, insurance and long-term rentals), subcontracts, fuel, supplies, short-term rentals and project overhead. Hourly labor is generally hired on a project-by-project basis. Costs of contract revenues vary significantly depending on the type and location of work performed and assets utilized.

The Company has 1 operating segment which is also the Company’s reportable segment and reporting unit of which the Company tests goodwill for impairment. The Company performed its most recent annual test of impairment as of July 1, 2020 with no indication of impairment as of the test date. The Company will perform its next scheduled annual test of goodwill in the third quarter of 2021.

On August 4, 2020, the Company announced that its board of directors approved a share repurchase program, authorizing, but not obligating, the repurchase of up to an aggregate amount of $75.0 million of its common stock from time to time through July 31, 2021.

The condensed consolidated results of operations and comprehensive income for the interim periods presented herein are not necessarily indicative of the results to be expected for the full year.

Basic earnings per share is computed by dividing net income attributable to common stockholders by the weighted-average number of common shares outstanding during the reporting period. Diluted earnings per share is computed similar to basic earnings per share except that it reflects the potential dilution that could occur if dilutive securities or other obligations to issue common stock were exercised or converted into common stock.

Accrued expenses at ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019~~2020 were as follows:

	September 30,		December 31,		June 30,		December 31,
	2020		2019		2021		2020

Insurance	$	15,512	$	15,702	$	17,365	$	14,754
Payroll and employee benefits		10,627		16,859		7,744		21,675
Income and other taxes						1,995		2,164
Interest		9,784		3,284		1,728		3,285
Contract reserves		3,052		6,248		750		2,491
Fuel hedge contracts		2,917		—
Income and other taxes		2,198		1,597
Other		8,022		7,535		7,648		8,530
Total accrued expenses	$	52,112	$	51,225	$	37,230	$	52,899

As of ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019,~~2020, the Company had 0 borrowings outstanding under our $200,000 amended and restated revolving credit and security agreement (as amended, the “Amended Credit Agreement”). There were ~~$36,391~~$35,909 and ~~$35,779~~$36,407 of letters of credit outstanding and ~~$163,247~~$163,764 and ~~$163,729~~$163,231 of availability under the Amended Credit Agreement as of ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019,~~2020, respectively. The availability under the Amended Credit Agreement is suppressed by ~~$362 and $492~~$327 as of ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019, respectively,~~2020, as a result of certain limitations set forth in the Amended Credit Agreement.

In May ~~2017,~~2021 the Company ~~issued $325,000~~sold $325 million of ~~8.000% senior notes (“8%~~unsecured 5.25% Senior Notes (the “2029 Notes”) pursuant to a private offering. The 2029 Notes were priced to investors at par and will mature on June 1, 2029. The Company used the net proceeds from the offering, together with cash on hand, to redeem all $325 million aggregate principal amount of its outstanding 8.000% Senior Notes due ~~May 15, 2022. The~~2022 (the “8% Notes”). Approximately $1.0 million of deferred financing fees related to the 8% Notes were extinguished and are presented within net interest ~~is paid semi-annually.~~expense in the Statement of Operations.

The Company’s obligations under these ~~Senior~~2029 Notes are guaranteed by ~~certain~~each of the Company’s existing and future 100% owned domestic ~~subsidiaries.~~subsidiaries that are co-borrowers or guarantors under its Amended Credit Agreement. Such guarantees are full, unconditional and joint and several. The parent company issuer has no independent assets or operations and all non-guarantor subsidiaries have been determined to be minor.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. A fair value hierarchy has been established by GAAP that requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The accounting guidance describes three levels of inputs that may be used to measure fair value:

Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company utilizes the market approach to measure fair value for its financial assets and liabilities. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. At times, the Company holds certain derivative contracts that it uses to manage commodity price risk. The Company does not hold or issue derivatives for speculative or trading purposes. The fair values of these financial instruments are summarized as follows:

			Fair Value Measurements at Reporting Date Using								Fair Value Measurements at Reporting Date Using
Description	At September 30, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		At June 30, 2021		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	2,917	$	—	$	2,917	$	—	$	4,802	$	-	$	4,802	$	-

			Fair Value Measurements at Reporting Date Using								Fair Value Measurements at Reporting Date Using
Description	At December 31, 2019		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		At December 31, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)

Fuel hedge contracts	$	849	$	—	$	849	$	—	$	1,739	$	-	$	1,739	$	-

The Company is exposed to certain market risks, primarily commodity price risk as it relates to diesel fuel purchase requirements, which occur in the normal course of business. The Company enters into heating oil commodity swap contracts to hedge the risk that fluctuations in diesel fuel prices could have an adverse impact on cash flows associated with its domestic dredging contracts. The Company’s typical goal is to hedge approximately 80% of the fuel requirements for work in domestic backlog.

As of ~~September~~June 30, ~~2020,~~2021, the Company was party to various swap arrangements to hedge the price of its diesel fuel purchase requirements for work in its backlog to be performed through ~~September 2021.~~June 2022. As of ~~September~~June 30, ~~2020,~~2021, there were ~~11.6~~8.7 million gallons remaining on these contracts which represent approximately 80% of the Company’s forecasted domestic fuel purchases through ~~September 2021.~~June 2022. Under these swap agreements, the Company will pay fixed prices ranging from ~~$1.12~~$1.22 to ~~$2.00~~$1.90 per gallon.

At ~~September~~June 30, ~~2020, the fair value liability of the fuel hedge contracts was estimated to be $2,917,~~2021 and ~~is recorded in accrued expenses. At~~ December 31, ~~2019,~~2020 the fair value asset of the fuel hedge contracts ~~was~~were estimated to be ~~$849,~~$4,802 and is$1,739, respectively, and are recorded in prepaid expenses and other current assets. For fuel hedge contracts considered to be highly effective, the losses reclassified to earnings from changes in fair value of derivatives, net of cash settlements and taxes, for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 were ~~$5,338.~~$3,404. The remaining gains and losses included in accumulated other comprehensive loss at ~~September~~June 30, ~~2020~~2021 will be reclassified into earnings over the next twelve months, corresponding to the period during which the hedged fuel is expected to be utilized. Changes in the fair value of fuel hedge contracts not considered highly effective are recorded as cost of contract revenues in the Statement of Operations. The fair values of fuel hedges are corroborated using inputs that are readily observable in public markets; therefore, the Company determines fair value of these fuel hedges using Level 2 inputs.

The Company is exposed to counterparty credit risk associated with non-performance of its various derivative instruments. The Company’s risk would be limited to any unrealized gains on current positions. To help mitigate this risk, the Company transacts only with counterparties that are rated as investment grade or higher. In addition, all counterparties are monitored on a continuous basis.

The fair value of the fuel hedge contracts outstanding as of ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019~~2020 is as follows:

		Fair Value at					Fair Value at
		September 30,		December 31,			June 30,		December 31,
	Balance Sheet Location	2020		2019		Balance Sheet Location	2021		2020
Asset derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Prepaid expenses and other current assets	$	—	$	849	Prepaid expenses and other current assets	$	4,802	$	1,739

Liability derivatives:
Derivatives designated as hedging instruments
Fuel hedge contracts	Accrued expenses	$	2,917	$	—

Changes in the components of the accumulated balances of other comprehensive income (loss) are as follows:

	Three Months Ended						Nine Months Ended					Three Months Ended					Six Months Ended
	September 30,						September 30,					June 30,					June 30,
	2020			2019			2020			2019		2021			2020		2021			2020
Derivatives:
Reclassification of derivative losses to earnings—net of tax		1,510			327			5,338			1,513
Reclassification of derivative (gains) losses to earnings—net of tax													(1,878	)		2,490		(3,404	)		3,828
Change in fair value of derivatives—net of tax		(631	)		(487	)		(8,145	)		1,304		2,282			950		5,694			(7,514	)
Total other comprehensive income (loss)	$	879		$	(160	)	$	(2,807	)	$	2,817
Net change in cash flow derivative hedges—net of tax												$	404		$	3,440	$	2,290		$	(3,686	)

Adjustments reclassified from accumulated balances of other comprehensive income (loss) to earnings are as follows:

		Three Months Ended				Nine Months Ended					Three Months Ended					Six Months Ended
		September 30,				September 30,					June 30,					June 30,
	Statement of Operations Location	2020		2019		2020		2019		Statement of Operations Location	2021			2020		2021			2020
Derivatives:
Fuel hedge contracts	Costs of contract revenues	$	2,029	$	443	$	7,161	$	2,049	Costs of contract revenues	$	(2,513	)	$	3,340		(4,554	)		5,132
	Income tax benefit		519		116		1,823		536	Income tax (provision) benefit		(635	)		850		(1,150	)		1,304
		$	1,510	$	327	$	5,338	$	1,513		$	(1,878	)	$	2,490	$	(3,404	)	$	3,828

The carrying value of financial instruments included in current assets and current liabilities approximates fair value due to the short-term maturities of these instruments. Based on timing of the cash flows and comparison to current market interest rates, the carrying value of our revolving credit agreement approximates fair value. In May ~~2017,~~2021 the Company issued ~~a total of~~ $325,000 of ~~8% senior notes due May 15, 2022,~~5.25% Senior Notes, which were outstanding at ~~September~~June 30, ~~2020~~2021 (see Note 4, Long-term debt). The ~~8% Senior~~2029 Notes are senior unsecured obligations of the Company and its subsidiaries that guarantee the ~~8% Senior~~2029 Notes. The fair value of the senior notes was ~~$333,278~~$334,783 at ~~September~~June 30, ~~2020,~~2021, which is a Level 1 fair value measurement as the senior notes’ value was obtained using quoted prices in active markets. It is impracticable to determine the fair value of outstanding letters of credit or performance, bid and payment bonds due to uncertainties as to the amount and timing of future obligations, if any.

On May ~~11, 2017,~~5, 2021, the Company’s stockholders approved the Great Lakes Dredge & Dock Corporation ~~2017~~2021 Long-Term Incentive Plan (the “Incentive Plan”), which previously had been approved by the Company’s board of directors subject to stockholder approval. The Incentive Plan replaces the 2017 Long-Term Incentive Plan (the “Prior Plan”) and is largely based on the Prior Plan, but with updates to the available shares and other administrative changes. The Incentive Plan permits the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to the Company’s employees and directors for up to 1.5 million shares of common stock, plus the number of shares that remained available for future grant under the Prior Plan as of the effectiveness of the Incentive Plan.

The Prior Plan permitted the granting of stock options, stock appreciation rights, restricted stock and restricted stock units to the Company’s employees and directors for up to 3.3 million shares of common stock, plus an additional 1.7 million shares underlying equity awards issued under the 2007 Long-Term Incentive Plan.

During the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company granted ~~790~~307 thousand restricted stock units to certain employees. In addition, all non-employee directors on the Company’s board of directors are paid a portion of their board-related compensation in stock grants or restricted stock units. Compensation cost charged to expense related to share-based compensation arrangements was ~~$1,761~~$798 and ~~$1,615~~$1,455 for the three months ended ~~September~~June 30, ~~2020~~2021 and ~~2019,~~2020, respectively. Compensation cost charged to expense related to share-based compensation arrangements was ~~$4,891~~$2,564 and ~~$5,234~~$3,130 for the ~~nine~~six months ended ~~September~~June 30, 2021 and 2020, ~~and 2019,~~ respectively.

At ~~September~~June 30, ~~2020,~~2021, the Company had ~~$661,281~~$454,402 of remaining performance obligations, which the Company refers to as total backlog. Approximately ~~28%~~93% of the Company’s backlog will be completed in ~~2020~~2021 with the remaining balance expected to be completed in ~~2021.~~2022.

The following series of tables presents our revenue disaggregated by several categories.

Domestically, our work generally is performed in coastal waterways and ~~deep water~~deep-water ports. The U.S. dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers & lakes. Foreign projects typically involve capital work.

The Company’s contract revenues by type of work, for the periods indicated, were as follows:

	Three Months Ended				Nine Months Ended				Three Months Ended				Six Months Ended
	September 30,				September 30,				June 30,				June 30,
Revenues	2020		2019		2020		2019		2021		2020		2021		2020
Dredging:
Capital—U.S.	$	98,194	$	62,518	$	245,183	$	214,668	$	79,399	$	63,440	$	157,005	$	146,989
Capital—foreign		9,787		12,554		20,630		39,523		1,613		3,981		6,322		10,843
Coastal protection		29,780		41,959		165,668		133,897		46,631		56,038		93,262		135,888
Maintenance		33,453		30,074		117,806		89,911		37,278		41,968		82,579		84,353
Rivers & lakes		4,627		22,670		12,169		69,224		4,993		2,493		8,379		7,542
Total revenues	$	175,841	$	169,775	$	561,456	$	547,223	$	169,914	$	167,920	$	347,547	$	385,615

The Company’s contract revenues by type of customer, for the periods indicated, were as follows:

	Three Months Ended				Nine Months Ended				Three Months Ended				Six Months Ended
	September 30,				September 30,				June 30,				June 30,
Revenues	2020		2019		2020		2019		2021		2020		2021		2020
Dredging:
Federal government	$	154,083	$	134,763	$	453,346	$	431,722	$	127,331	$	133,496	$	258,063	$	299,263
State and local government		4,464		18,505		76,489		69,077		37,069		29,693		71,844		72,025
Private		7,507		3,953		10,991		6,901		3,901		750		11,318		3,484
Foreign		9,787		12,554		20,630		39,523		1,613		3,981		6,322		10,843
Total revenues	$	175,841	$	169,775	$	561,456	$	547,223	$	169,914	$	167,920	$	347,547	$	385,615

Accounts receivable at ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019~~2020 are as follows:

	September 30,			December 31,			June 30,			December 31,
	2020			2019			2021			2020
Completed contracts	$	12,140		$	3,444		$	12,526		$	12,347
Contracts in progress		27,083			9,490			15,393			21,239
Retainage		8,559			7,415			8,386			5,968
		47,782			20,349			36,305			39,554
Allowance for doubtful accounts		(564	)		(564	)		(564	)		(564	)

Total accounts receivable—net	$	47,218		$	19,785		$	35,741		$	38,990

The components of contracts in progress at ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019~~2020 are as follows:

	September 30,			December 31,			June 30,			December 31,
	2020			2019			2021			2020
Costs and earnings in excess of billings:
Costs and earnings for contracts in progress	$	324,464		$	104,620		$	317,984		$	199,964
Amounts billed		(307,991	)		(86,074	)		(291,493	)		(168,569	)
Costs and earnings in excess of billings for contracts in progress		16,473			18,546			26,491			31,395
Costs and earnings in excess of billings for completed contracts		6,174			6,126			10,177			2,823
Total contract revenues in excess of billings	$	22,647		$	24,672		$	36,668		$	34,218

Current portion of contract revenues in excess of billings	$	20,588		$	22,560		$	34,556		$	32,106
Long-term contract revenues in excess of billings		2,059			2,112			2,112			2,112
Total contract revenues in excess of billings	$	22,647		$	24,672		$	36,668		$	34,218

Billings in excess of costs and earnings:
Amounts billed	$	(330,853	)	$	(628,491	)	$	(382,785	)	$	(550,468	)
Costs and earnings for contracts in progress		292,699			573,225			353,952			517,860
Total billings in excess of contract revenues	$	(38,154	)	$	(55,266	)	$	(28,833	)	$	(32,608	)

At ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019,~~2020, costs to fulfill a contract with a customer recognized as an asset were ~~$8,848~~$6,887 and ~~$10,300,~~$10,501, respectively, and are recorded in other current assets and other noncurrent assets. These costs relate to pre-contract and pre-construction activities. During the three and ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 and ~~2019,~~2020, the Company amortized ~~$2,891~~$5,909 and ~~$11,695~~$3,612, and ~~$3,097~~11,756 and ~~$8,846,~~8,804 respectively, of pre-construction costs.

Performance and bid bonds are customarily required for dredging and marine construction ~~projects, as well as some environmental & infrastructure~~ projects. The Company has bonding agreements with Argonaut Insurance Company, Berkley Insurance Company, Chubb Surety and Liberty Mutual Insurance Company, under which the Company can obtain performance, bid and payment bonds. The Company also has outstanding bonds with Travelers Casualty, Surety Company of America and Zurich American Insurance ~~Company (“Zurich”).~~Company. Bid bonds are generally obtained for a percentage of bid value and amounts outstanding typically range from $1,000 to $10,000. At ~~September~~June 30, ~~2020,~~2021, the Company had outstanding performance bonds with a notional amount of approximately ~~$1,254,315 of which $17,401 relates to projects from the Company’s historical environmental & infrastructure businesses.~~$1,143,833. The revenue value remaining in backlog ~~related to these projects~~ totaled approximately ~~$593,142.~~

In connection with the sale of its historical demolition business, the Company was obligated to keep in place the surety bonds on pending demolition projects for the period required under the respective contract for a project and issued Zurich a letter of credit related to this exposure. In February 2017, the Company was notified by Zurich of an alleged default triggered on a historical demolition surety performance bond in the aggregate of approximately $20,000 for failure of the contractor to perform in accordance with the terms of a project. In May 2017, Zurich drew upon the letter of credit in the amount of $20,881. In order to fund the draw on the letter of credit in May 2017, the Company had to increase the borrowings on its revolving credit facility. As the outstanding letters of credit previously reduced the Company’s availability under the revolving credit facility, this draw down on the Company’s letter of credit did not impact its liquidity or capital availability.

Pursuant to the terms of sale of its historical demolition business, the Company received an indemnification commitment from the buyer for losses resulting from the bonding arrangement. In April 2020, the Court granted the Company’s motion for entry of final judgment in the amount of $21,934 based upon the buyer’s default of its obligations to indemnify the Company for losses resulting from the bonding arrangement. In May 2020, the Court entered that final judgment, and in June 2020, Defendants filed a notice of appeal from that judgment.The Company cannot estimate the amount or range of collectible recoveries related to the indemnification. It does, however, intend to oppose the appeal and aggressively pursue collection from the buyer for such payment.$454,402.

Certain foreign projects performed by the Company have warranty periods, typically spanning no more than one to three years beyond project completion, whereby the Company retains responsibility to maintain the project site to certain specifications during the warranty period. Generally, any potential liability of the Company is mitigated by insurance, shared responsibilities with consortium partners, and/or recourse to owner-provided specifications.

As is customary with negotiated contracts and modifications or claims to competitively bid contracts with the federal government, the government has the right to audit the books and records of the Company to ensure compliance with such contracts, modifications, or claims, and the applicable federal laws. The government has the ability to seek a price adjustment based on the results of such audit. Any such audits have not had, and are not expected to have, a material impact on the financial position, operations, or cash flows of the Company.

Various legal actions, claims, assessments and other contingencies arising in the ordinary course of business are pending against the Company and certain of its subsidiaries. The Company will defend itself vigorously on all matters. These matters are subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved, or settled adversely to the Company. Although the Company is subject to various claims and legal actions that arise in the ordinary course of business, except as described below, the Company is not currently a party to any material legal proceedings or environmental claims. The Company records an accrual when it is probable a liability has been incurred and the amount of loss can be reasonably estimated. The Company does not believe any of these proceedings, individually or in the aggregate, would be expected to have a material effect on results of operations, cash flows or financial condition.

On April 23, 2014, the Company completed the sale of NASDI, LLC (“NASDI”) and Yankee Environmental Services, LLC (“Yankee”), which together comprised the Company’s historical demolition business, to a privately owned demolition company. On January 14, 2015, the Company and its subsidiary, NASDI Holdings, LLC, brought an action in the Delaware Court of Chancery to enforce the terms of the Company's agreement to sell NASDI and Yankee. Under the terms of the agreement, the Company received cash of $5,309 and retained the right to receive additional proceeds based upon future collections of outstanding accounts receivable and work in process existing at the date of close. The Company seeks specific performance of the buyer’s obligation to collect and to remit the additional proceeds, and other related relief. Defendants have filed counterclaims alleging that the Company misrepresented the quality of its contracts and receivables prior to the sale. The Company denies defendants’ allegations. In addition, the Company has been granted a judgment in the amount of $21,934 based upon the buyer’s default of its obligations to indemnify the Company for losses resulting from failure to perform in accordance with terms of surety performance bond. The defendants filed a notice of appeal from that judgement. The Company continues to aggressively pursue collection from the buyer on outstanding amounts owed under the sale and the indemnification. An estimate of a range of potential gains or losses relating to these matters cannot reasonably be made.

~~In June 2019,~~On April 22, 2021, the U.S. Attorney’s Office for the Eastern District of Louisiana ~~informed the Company that it intends to file criminal charges~~filed a bill of information against the Company ~~in connection~~charging the Company with a negligent discharge violation of the Clean Water Act arising from a September 2016 oil spill. The ~~oil~~ spill occurred during the Company’s Cheniere Ronquille project ~~allegedly resulting~~and resulted in the discharge of around ~~160~~one hundred sixty barrels of crude oil in Bay Long, Louisiana. The Company has cooperated with the U.S. Attorney’s Office and other relevant agencies in ~~its~~their investigation of the oil spill and ~~believes that~~on June 15, 2021, the Company pleaded guilty to the misdemeanor violation alleged in the bill of information and agreed to pay a fine of $1,000. As a result, the government may initiate suspension or debarment proceedings against us, which might prohibit us from bidding for, entering into or completing certain government projects. The Company also remains subject to potential liability for restitution in connection with this criminal ~~charges are~~matter and potential liability in a pending civil suit arising from the same matter. Although the Company does not ~~warranted.~~know whether proceedings will be initiated or result in prohibitions, or the impact of any such resulting prohibitions, the Company does not expect any such proceedings or prohibitions to cause a material disruption to its business, financial condition or results of operations.

On September 27, 2019, the EPA Region 4 filed an administrative complaint against the Company relating to a project the Company performed at PortMiami from ~~2013-2015. The EPA is~~2013-2015 alleging violations of Section 103 of the Marine Protection, Research, and Sanctuaries Act (“MPRSA”) and failure to report violations of the MPRSA. ~~The EPA has calculated and proposed that~~In July 2021, the ~~administrative court issue~~parties executed a ~~penalty in the total amount of $973. The Company disagrees with the EPA on whether violations occurred and, if any violation did occur, the appropriate penalty calculation.~~

~~Except as noted above,~~consent agreement wherein the Company ~~has not accrued any amounts with respect~~agreed to ~~the above matters~~pay $500 as ~~the Company does not believe, based on information currently known to it, that~~ a ~~loss relating to these matters is probable, and an estimate of a range of potential losses relating to these matters cannot reasonably be made.~~civil penalty.

The Company leases certain operating equipment and office facilities under long-term operating leases expiring at various dates through ~~2026.~~2030. The equipment leases contain renewal or purchase options that specify prices at the then fair value upon the expiration of the lease terms. The leases also contain default provisions that are triggered by an acceleration of debt maturity under the terms of the Company’s Amended Credit Agreement, or, in certain instances, cross default to other equipment leases and certain lease arrangements require that the Company maintain certain financial ratios comparable to those required by its Amended Credit Agreement. Additionally, the leases typically contain provisions whereby the Company indemnifies the lessors for the tax treatment attributable to such leases based on the tax rules in place at lease inception. The tax indemnifications do not have a contractual dollar limit. To date, no lessors have asserted any claims against the Company under these tax indemnification provisions.

During the second quarter of 2019, the Company entered into an agreement and completed the sale of the historical environmental & infrastructure business. Under the terms of the agreement, the Company received cash of $17,500 in the second quarter of 2019 and received an additional $857 in the third quarter of 2019.

~~The results of the historical environmental & infrastructure businesses have been reported in discontinued operations as follows:~~

Certain statements in this Quarterly Report on Form 10-Q may constitute “forward-looking” statements as defined in Section 27A of the Securities Act of 1933 (the “Securities Act”), Section 21E of the Securities Exchange Act of 1934 (the “Exchange Act”), the Private Securities Litigation Reform Act of 1995 (the “PSLRA”) or in releases made by the Securities and Exchange Commission (“SEC”), all as may be amended from time to time. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause the actual results, performance or achievements of Great Lakes Dredge & Dock Corporation and its subsidiaries (“Great Lakes” or the “Company”), or industry results, to differ materially from any future results, performance or achievements expressed or implied by such forward-looking statements. Statements that are not historical fact are forward-looking statements. Forward-looking statements can be identified by, among other things, the use of forward-looking language, such as the words “plan,” “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “may,” “would,” “could,” “should,” “seeks,” or “scheduled to,” or other similar words, or the negative of these terms or other variations of these terms or comparable language, or by discussion of strategy or intentions.

These cautionary statements are being made pursuant to the Securities Act, the Exchange Act and the PSLRA with the intention of obtaining the benefits of the “safe harbor” provisions of such laws. Great Lakes cautions investors that any forward-looking statements made by Great Lakes are not guarantees or indicative of future performance. Important assumptions and other important factors that could cause actual results to differ materially from those forward-looking statements with respect to Great Lakes, include, but are not limited to, risks and uncertainties that are described in Item 1A. “Risk Factors” of Great Lakes’ Annual Report on Form 10-K for the year ended December 31, ~~2019,~~2020, in Item 1A. “Risk Factors” of Great ~~Lakes~~Lakes’ Quarterly ~~Reports~~Report on Form 10-Q for the ~~quarters~~quarter ended March 31, ~~2020 and June 30, 2020,~~2021, in Item 1A. “Risk Factors” of this Quarterly Report on Form 10-Q and in other securities filings by Great Lakes with the SEC.

Although Great Lakes believes that its plans, intentions and expectations reflected in or suggested by such forward-looking statements are reasonable, actual results could differ materially from a projection or assumption in any forward-looking statements. Great Lakes’ future financial condition and results of operations, as well as any forward-looking statements, are subject to change and inherent risks and uncertainties. The forward-looking statements contained in this Quarterly Report on Form 10-Q are made only as of the date hereof and Great Lakes does not have or undertake any obligation to update or revise any forward-looking statements whether as a result of new information, subsequent events or otherwise, unless otherwise required by law.

The Company is the largest provider of dredging services in the United States. In addition, the Company has a long history of performing significant international projects. The mobility of the Company’s fleet enables the Company to move equipment in response to changes in demand for dredging services.

~~On October 22,~~In the fourth quarter of 2020, the Company announced the ~~upcoming~~ relocation of its headquarters from Oak Brook, Illinois to Houston, ~~Texas, with offices anticipated to open~~Texas. The Company’s new corporate office in ~~early~~Houston opened in the first quarter of 2021. ~~The~~This relocation ~~will place~~places the Company closer to key regional customers and new markets, especially along the Gulf Coast and the Mississippi River.

Dredging generally involves the enhancement or preservation of navigability of waterways or the protection of shorelines through the removal or replenishment of soil, sand or rock. Domestically, our work generally is performed in coastal waterways and deep water ports. The U.S. dredging market consists of four primary types of work: capital, coastal protection, maintenance and rivers & lakes. The Company’s bid market is defined as the aggregate dollar value of domestic dredging projects on which the Company bid or could have bid if not for capacity constraints (“bid market”). The Company experienced an average combined bid market share in the U.S. of ~~39%~~37% over the prior three years, including ~~56%~~49%, ~~53%~~55%, ~~16%~~19% and ~~45%~~34% of the domestic capital, coastal protection, maintenance and rivers & lakes sectors, respectively.

The Company’s largest domestic dredging customer is the U.S. Army Corps of Engineers (the “Corps”), which has responsibility for federally funded projects related to navigation and flood control of U.S. waterways. In the first ~~nine~~six months of ~~2020,~~2021, the Company’s dredging revenues earned from contracts with federal government agencies, including the Corps as well as other federal entities such as the U.S. Coast Guard and the U.S. Navy, were approximately ~~81%~~74% of dredging revenues, ~~above~~slightly below the Company’s prior three year average of ~~74%~~79%.

In December 2019, a novel strain of coronavirus (COVID-19) was reported to have surfaced in Wuhan, China. COVID-19 has since spread worldwide and to every state in the United States. On March 11, 2020, the World Health Organization declared COVID-19 a pandemic and on March 13, 2020 the United States declared a national emergency in response to the coronavirus outbreak. This outbreak has severely impacted global economic activity and many countries and states in the United States have reacted by instituting quarantines, mandating school and business closures and limiting ~~travel.~~travel at various times throughout the pandemic.

On March 28, 2020, dredging was specifically listed in the U.S. Department of Homeland Security’s “Advisory Memorandum on Identification of Essential Critical Infrastructure Workers During COVID-19 Response” which federally designates the Company as an essential business or “critical infrastructure” company that can maintain operations during the ongoing pandemic. As mentioned above, the Company’s largest domestic dredging customer is the Corps; the Corps oversees the majority of these critical infrastructure

projects and, in this capacity, has continued to follow their bid schedule and prioritize all types of dredging including port maintenance and expansion and coastal protection projects that are necessary to avoid potential storm damage during ~~the current~~ hurricane season. Despite the uncertainty surrounding COVID-19, to date, the Corps is continuing to advertise new projects. During the first half of 2021 the Company began to experience increased project costs and delays related to COVID-19; currently, all affected projects ~~and the Company’s project work is largely uninterrupted.~~are back in operation.

~~Senior management regularly~~Our Executive Leadership team has established a COVID-19 Command Team that meets twice each week to update contingency plans, as necessary, and address the challenges related to maintaining operations in this evolving economic environment. The Company’s primary focus has been the health and safety of its employees. The Company has implemented new paid leave policies and additional sanitary and safety measures to mitigate the risk of infection to employees.

On vessels and job sites, the Company has instituted fewer employee shift changes and increased sanitary and social distancing measures. ~~Although we have~~In the first half of 2021, the Company began to experience more significant operational interruptions and direct costs related to the third wave of the COVID-19 pandemic. Several vessel crews were infected despite extensive testing and isolation protocols. Vessels were required to go to shore for crew changes and the vessels had ~~crew members on certain~~to be disinfected before returning to work. This impacted the vessels’ scheduling and availability which led to project delays. Currently, those projects and vessels that were impacted are completed and back in operation, respectively. The Company has initiated an extensive vaccination effort of our ~~vessels contract COVID-19, such instances have not to date had a material impact on our business.~~ crews and staff and the Company currently has 71% of its staff either fully vaccinated or partially vaccinated.

Since March 2020, the Company’s corporate employees have effectively transitioned to a remote working environment and have discontinued non-essential travel to follow recommended physical and social distancing guidelines in order to reduce the risk of infection. Beginning in the current quarter, the Company’s Houston employees began transitioning back to working in person at the Houston corporate headquarters. The Company is following the protocols published by the U.S. Centers for Disease Control and Prevention, the World Health Organization and state and local governments. As the Company’s employees, customers and communities are facing significant challenges, the Company cannot predict how COVID-19 will evolve or the impact it, or actions taken to contain it, will have on future results. ~~As of September 30, 2020,~~Due to the ~~Company’s business has not been significantly impacted by COVID-19, but~~uncertainty that surrounds this virus, the Company will be continually evaluating safety and operational contingency plans and the potential future impact that this evolving environment has on the Company’s business, financial condition and results of operations.

The Company ~~has seen support~~plans to participate in the offshore wind market and in March 2021 the Company awarded a contract for the ~~dredging industry~~design and development of the first U.S. flagged Jones Act compliant, inclined fall-pipe vessel for subsea rock installation for wind turbine foundations. This vessel would represent a significant critical advancement in building the U.S. logistics infrastructure to support the future of the new U.S. offshore wind industry. Once the contract is fully executed, the Company expects delivery of the vessel in early 2024. As of the current quarter, the Company has begun soliciting bids in the ~~2021 House Appropriations Bill, introduced in July 2020, which showed an increase~~offshore wind market.

The current administration has pushed to accelerate renewable energy developments and has set a target to install 30GW of ~~$1.7 billion above the President’s budget request for the Corps. Although the appropriations bill was not passed before the close of~~offshore wind energy generation capacity by 2030 on the U.S. ~~federal government’s fiscal year,~~east coast. Additionally, in March, the White House announced new initiatives that will advance the administration’s goals to expand the nation’s offshore wind energy capacity in the coming decade by opening new areas of development, improving environmental permitting and increasing public financing for projects.

In July 2021, the Corps’ 2021 budget was approved by the House of Representatives at a record high proposed budget level of $8.66 billion. In this bill, the Harbor Maintenance Trust Fund (the “HMTF”) would receive $2.05 billion. This record funding is ~~not unusual, and as a result, the Corps is working under temporary funding, also known as a Continuing Resolution, to continue their work with minimal impacts~~in addition to the ~~marketplace. The~~annual cap being lifted from the HMTF in 2020 and the 2020 Water Resource Development Act ~~bill (WRDA), which~~(the “WRDA”). WRDA authorizes new projects and makes policy changes that will make natural infrastructure and beneficial use of dredged material more common ~~has progressed but is pending until after the 2020 U.S. general election. The campaigns for each presidential candidate~~and was included in the ~~2020 U.S. general election have been positive~~Consolidated Appropriations Act 2021 signed into law on ~~issues~~December 27, 2020. This continues the trend of WRDA legislation in each session of Congress since 2014. The legislation provides access to the ~~industry as both candidates have indicated support~~$9.3 billion in unspent HMTF tax collections, establishes a funds distribution process for ~~the Jones Act as well as continued major investments in infrastructure including ports~~HMTF funding and ~~dredging.~~

During the second quarter of 2019, the Company entered into an agreement and completed the sale of its historical environmental & infrastructure business. The historical environmental & infrastructure segment has been retrospectively presented as discontinued operations. Referapproves projects to ~~Note 9, Business dispositions,~~proceed to ~~our condensed consolidated financial statements.~~construction.

The Company has one operating segment which is also the Company’s one reportable segment and reporting unit.

The Company’s vessels are subject to periodic dry dock inspections to verify that the vessels have been maintained in accordance with the rules of the U.S. Coast Guard and the American Bureau of Shipping (“ABS”) and that recommended repairs have been satisfactorily completed. Dry dock frequency is a statutory requirement mandated by the U.S. Coast Guard and the ABS. The Company’s vessels dry-dock every two to three years or every five years, depending on the vessel type and also on an as-needed basis for occasional unscheduled repairs. As expected, the Company completed several dry dock inspections in the third quarter of 2020 and returned those vessels to service in the fourth quarter. Additionally, some vessels remained in dry dock at quarter end with the expectation of returning to work in the fourth quarter.

The following tables set forth the components of net income and Adjusted EBITDA, ~~from continuing operations,~~ as defined below, as a percentage of contract revenues for the three and ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 and ~~2019:~~2020:

													Three Months Ended						Six Months Ended
	Three Months Ended						Nine Months Ended						June 30,						June 30,
	September 30,						September 30,						2021			2020			2021				2020
	2020			2019			2020			2019
Contract revenues		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0	%		100.0		%		100.0		%
Costs of contract revenues		(79.3	)		(81.2	)		(75.4	)		(78.2	)		(86.5	)		(80.3	)		(83.9	)			(73.7	)
Gross profit		20.7			18.8			24.6			21.8			13.5			19.7			16.1				26.3
General and administrative expenses		8.5			7.9			8.1			7.8			8.4			8.8			8.8				7.9
Proceeds from loss of use claim		(1.0	)		—			(0.3	)		-
(Gain) loss on sale of assets—net		—			—			—			0.1
Gain on sale of assets—net														(0.1	)		-			-				-
Operating income		13.2			10.9			16.8			13.9			5.2			10.9			7.3				18.4
Interest expense—net		(3.8	)		(3.7	)		(3.6	)		(3.9	)		(3.9	)		(4.0	)		(3.8	)			(3.5	)
Other income (expense)		0.1			—			(0.1	)		—			0.4			0.3			0.3				(0.1	)
Income from continuing operations before income taxes		9.5			7.2			13.1			10.0
Income before income taxes														1.7			7.2			3.8				14.8
Income tax provision		(2.3	)		(1.9	)		(3.3	)		(2.6	)		(0.5	)		(1.9	)		(0.6	)			(3.7	)
Income from continuing operations		7.2			5.3			9.8			7.4
Loss from discontinued operations, net of income taxes		—			(0.5	)		—			(1.4	)
Net income		7.2			4.8			9.8			6.0			1.2			5.3			3.2		%		11.1		%

Adjusted EBITDA from continuing operations		18.3	%		16.0	%		21.7	%		18.8	%
Adjusted EBITDA														11.9	%		16.7	%		13.5		%		23.2		%

Adjusted EBITDA, ~~from continuing operations,~~ as provided herein, represents net income (loss) from continuing operations, adjusted for net interest expense, income taxes, depreciation and amortization expense, debt extinguishment, accelerated maintenance expense for new international deployments, goodwill or asset impairments and gains on bargain purchase acquisitions. Adjusted EBITDA ~~from continuing operations~~ is not a measure derived in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Company presents Adjusted EBITDA ~~from continuing operations~~ as an additional measure by which to evaluate the Company’s operating trends. The Company believes that Adjusted EBITDA ~~from continuing operations~~ is a measure frequently used to evaluate performance of companies with substantial leverage and that the Company’s primary stakeholders (i.e., its stockholders, bondholders and banks) use Adjusted EBITDA ~~from continuing operations~~ to evaluate the Company’s period to period performance. Additionally, management believes that Adjusted EBITDA ~~from continuing operations~~ provides a transparent measure of the Company’s recurring operating performance and allows management and investors to readily view operating trends, perform analytical comparisons and identify strategies to improve operating performance. For this reason, the Company uses a measure based upon Adjusted EBITDA ~~from continuing operations~~ to assess performance for purposes of determining compensation under the Company’s incentive plan. Adjusted EBITDA ~~from continuing operations~~ should not be considered an alternative to, or more meaningful than, amounts determined in accordance with GAAP including: (a) operating income as an indicator of operating performance; or (b) cash flows from operations as a measure of liquidity. As such, the Company’s use of Adjusted EBITDA, ~~from continuing operations,~~ instead of a GAAP measure, has limitations as an analytical tool, including the inability to determine profitability or liquidity due to the exclusion of accelerated maintenance expense for new international deployments, goodwill or asset impairments, gains on bargain purchase acquisitions, interest and income tax expense and the associated significant cash requirements and the exclusion of depreciation and amortization, which represent significant and unavoidable operating costs given the level of indebtedness and capital expenditures needed to maintain the Company’s business. For these reasons, the Company uses operating income to measure the Company’s operating performance and uses Adjusted EBITDA ~~from continuing operations~~ only as a supplement. The following is a reconciliation of Adjusted EBITDA ~~from continuing operations~~ to net ~~income (loss):~~income:

	Three Months Ended				Nine Months Ended				Three Months Ended				Six Months Ended
	September 30,				September 30,				June 30,				June 30,
	2020		2019		2020		2019		2021		2020		2021		2020
(in thousands)
Income from continuing operations		12,547		8,811		55,494		40,856
Net income									$	2,105	$	8,960	$	10,919	$	42,947
Adjusted for:
Interest expense—net		6,719		6,335		20,074		21,074		6,657		6,725		13,243		13,355
Income tax provision		4,076		3,204		18,517		14,280		829		3,131		2,218		14,441
Depreciation and amortization		8,877		8,771		27,584		26,772		10,628		9,256		20,681		18,707
Adjusted EBITDA from continuing operations	$	32,219	$	27,121	$	121,669	$	102,982
Adjusted EBITDA									$	20,219	$	28,072	$	47,061	$	89,450

The Company’s contract revenues by type of work, for the periods indicated, were as follows:

	Three Months Ended							Nine Months Ended							Three Months Ended							Six Months Ended
	September 30,							September 30,							June 30,							June 30,
Revenues (in thousands)	2020		2019		Change			2020		2019		Change			2021		2020		Change			2021		2020		Change
Dredging:
Capital—U.S.	$	98,194	$	62,518		57.1	%	$	245,183	$	214,668		14.2	%	$	79,399	$	63,440		25.2	%	$	157,005	$	146,989		6.8	%
Capital—foreign		9,787		12,554		(22.0	)%		20,630		39,523		(47.8	)%		1,613		3,981		(59.5	)%		6,322		10,843		(41.7	)%
Coastal protection		29,780		41,959		(29.0	)%		165,668		133,897		23.7	%		46,631		56,038		(16.8	)%		93,262		135,888		(31.4	)%
Maintenance		33,453		30,074		11.2	%		117,806		89,911		31.0	%		37,278		41,968		(11.2	)%		82,579		84,353		(2.1	)%
Rivers & lakes		4,627		22,670		(79.6	)%		12,169		69,224		(82.4	)%		4,993		2,493		100.3	%		8,379		7,542		11.1	%
Total revenues	$	175,841	$	169,775		3.6	%	$	561,456	$	547,223		2.6	%	$	169,914	$	167,920		1.2	%	$	347,547	$	385,615		(9.9	)%

Total revenue was ~~$175.8~~$169.9 million for the three months ended ~~September~~June 30, ~~2020,~~2021, up ~~$6.0~~$2.0 million, or 4%1.2%, from ~~$169.8~~$167.9 million for the same period in the prior year. For the three months ended ~~September~~June 30, ~~2020,~~2021, the Company experienced aann increase in domestic capital and ~~maintenance~~rivers & lakes revenues as compared to the same period in the prior year. This increase was ~~partially~~ offset by a decreaseincoastal protection, ~~rivers & lakes~~maintenance, and foreign capital revenue ~~revenues~~ during the current period as compared to the same period in the prior year.For the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, total revenue was ~~$561.5~~$347.5 million, updown from revenue of ~~$547.2~~$385.6 million for the same period in the prior year, representing ~~an increase~~a decrease of ~~$14.3~~$38.1 million or 3%9.9%. For the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company experienced ~~an increase~~a decrease in ~~domestic capital,~~ coastal protection, maintenance and ~~maintenance revenues~~foreign capital revenue as compared to the same period in the prior year. This ~~increase~~decrease was ~~partially~~slightly offset by ~~a decrease~~ an increase in domestic capital and rivers & lakes ~~and foreign capital~~ revenues during the current period as compared to the same period in the prior year.

Capital dredging consists primarily of port expansion projects, which involve the deepening of channels and berthing basins to allow access by larger, deeper draft ships and the provision of land fill used to expand port facilities. In addition to port work, capital projects also include coastal restoration and land reclamations, trench digging for pipelines, tunnels and cables, and other dredging related to the construction of breakwaters, jetties, canals and other marine structures. For the ~~quarter~~three months ended ~~September~~June 30, ~~2020,~~2021, domestic capital dredging revenue was ~~$98.2~~$79.4 million, up ~~$35.7~~$16.0 million, or ~~57%~~25.2%, compared to ~~$62.5~~$63.4 million for the same period in ~~2019. For~~2020. The increase in capital dredging revenues for the three months ended ~~September~~June 30, ~~2020, the increase in domestic capital dredging revenue~~2021 was ~~primarily driven by~~mostly due to a greater amount of revenue earned on ~~the deepening~~ projects in ~~Charleston~~Texas, Massachusetts, and ~~Jacksonville and a coastal restoration project in Mississippi~~Alabama, in the current year quarter when compared to the prior year ~~period.~~quarter. This increase was partially offset by less revenue earned on projects in Florida and Louisiana in the current quarter. For the six months ended June 30, 2021, domestic capital revenue was $157.0 million compared to $147.0 million for the same period in 2020, representing an increase of $10.0 million, or 6.8%. The increase in capital dredging revenues for the six months ended June 30, 2021 was mostly due to a greater amount of revenue earned on ~~a deepening project~~projects in ~~Corpus Christi during~~Massachusetts, and South Carolina, in the prior year period aswhen compared to the current year. For the nine months ended September 30, 2020, domestic capital dredging revenue was $245.2 million compared to $214.7 million for the same period in 2019, representing an increase of $30.5 million, or 14%. For the nine months ended September 30, 2020, the higher domestic capital dredging revenue was primarily driven by greater revenue earned from deepening projects in Charleston and Jacksonville and a coastal restoration project in Mississippi in the current year when compared to the prior year period. This increase was partially offset by ~~a greater amount of~~less revenue earned on ~~deepening~~ projects in ~~Tampa, Corpus Christi~~Texas, Delaware, and ~~on the Delaware River during the same period~~Florida in the ~~prior~~current year.

Foreign capital projects typically involve land reclamations, channel deepening and port infrastructure development. In the ~~third~~second quarter of ~~2020,~~2021, foreign capital revenue was ~~$9.8~~$1.6 million, down ~~$2.8~~$2.4 million, or ~~22%~~59.5%, as compared to ~~$12.6~~$4.0 million in the same quarter in the prior year. Foreign capital revenue for the ~~nine months ended September 30, 2020~~first half of 2021 was ~~$20.6~~$6.3 million which is ~~$18.9~~$4.5 million, or ~~48%~~41.7%, lower than revenue of ~~$39.5~~$10.8 million for the same period of the prior year. The ~~decrease~~Company continued to earn revenue in ~~revenue for the three and nine months ended September 30, 2020 was driven by a decrease in revenue earned on~~2021 from a project in Bahrain that ~~commenced during~~is essentially completed as of the ~~first quarter of 2019.~~current quarter.

Coastal protection projects involve moving sand from the ocean floor to shoreline locations where erosion threatens shoreline assets. Coastal protection revenue for the quarter ended ~~September~~June 30, ~~2020~~2021 was ~~$29.8~~$46.6 million, a decrease of ~~$12.2~~$9.4 million, or ~~29%~~16.8%, compared to ~~$42.0~~$56.0 million in the prior year period. The decrease in coastal protection revenues for the three months ended ~~September~~June 30, ~~2020~~2021 was mostly attributable to a lower amount of revenue earned on projects in Virginia, New Jersey, Florida and South Carolina in the prior year period when compared to the current year. This decrease was slightly offset by revenue earned on two projects in North Carolina in the current year quarter. Coastal protection revenue for the six months ended June 30, 2021 was $93.3 million, representing a decrease of $42.6 million or 31.4%, from $135.9 million for the same period in 2020. The decrease in coastal protection revenues for the six months ended June 30, 2021 was mostly due to a greater amount of revenue earned on projects in ~~North~~Virginia, New Jersey, Florida, South Carolina, and ~~Virginia~~Georgia, in the prior year period when compared to the current year. This decrease was partially offset by revenue earned on projects in New Jersey in the current year. Coastal protection revenue for the nine months ended September 30, 2020 was $165.7 million, representing an increase of $31.8 million or 24%, from $133.9 million for the nine months ended September 30, 2019. The increase in coastal protection revenue for the nine months ended September 30, 2020 was mostly attributable to a greater amount of revenue earned on projects in Florida, Virginia and Georgia in the current year as compared to the same period in the prior year. This increase was partially offset by a greater amount ofmore revenue earned on projects in North Carolina and ~~South Carolina during the same period~~Louisiana in ~~the prior year when compared to~~ the current year.

Maintenance dredging consists of the re-dredging of previously deepened waterways and harbors to remove silt, sand and other accumulated sediments. Due to natural sedimentation, most channels generally require maintenance dredging every one to three years, thus creating a recurring source of dredging work that is typically non-deferrable if optimal navigability is to be maintained. In addition, severe weather such as hurricanes, flooding and droughts can also cause the accumulation of sediments and drive the need for maintenance dredging. Maintenance revenue for the ~~third~~second quarter of ~~2020~~2021 was ~~$33.5~~$37.3 million, ~~up $3.4~~down $4.7 million, or ~~11%~~11.2%, from ~~$30.1~~

$42.0 million in the ~~third~~second quarter of ~~2019.~~2020. The ~~increase~~decrease in maintenance revenues for the three months ended ~~September~~June 30, ~~2020~~2021 was mostly attributable to a greater amount of revenue earned on projects in Maryland, ~~New Jersey~~North Carolina, Texas, and ~~Virginia.~~Virginia in the prior year quarter, when compared to the current year quarter. This ~~increase~~decrease was partially offset by higher revenue earned on ~~a project~~projects in ~~North Carolina~~Florida, Georgia and ~~Texas~~Louisiana in the ~~prior~~current year ~~and revenue on a project in South Carolina that did not repeat during the current year.~~quarter. Maintenance revenue for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 was ~~$117.8~~$82.6 million, ~~an increase~~a decrease of ~~$27.9~~$1.8 million, or ~~31%~~2.1%, compared to ~~$89.9~~$84.4 million for the comparable period in ~~the~~ prior year. The ~~increase~~decrease in maintenance ~~dredging revenue~~revenues for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 was mostly ~~attributable~~due to a greater amount of revenue earned on projects in Maryland and ~~Virginia.~~Virginia in the prior year period when compared to the current year. This ~~increase~~decrease was partially offset by ~~greater~~more revenue earned on projects in ~~Texas~~Florida, Georgia and ~~South Carolina~~Louisiana in ~~the prior year when compared to~~ the current year.

Rivers & lakes dredging and related operations typically consist of lake and river dredging, inland levee and construction dredging, environmental restoration and habitat improvement and other marine construction projects. During the ~~third~~second quarter of ~~2020,~~2021, rivers & lakes revenue was ~~$4.6~~$5.0 million, ~~a decrease~~an increase of ~~$18.1~~$2.5 million, or ~~80%~~100.3%, from ~~$22.7~~$2.5 million during the same period of ~~2019.~~2020. The increase in river and lakes revenue for the three month ended June 30, 2021 was mostly attributable to a greater amount of revenue earned on projects in Mississippi and Texas in the current year quarter. Rivers & lakes revenue for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 was ~~$12.2~~$8.4 million, ~~down $57.0~~up $0.9 million, or ~~82%~~12.0%, from ~~$69.2~~$7.5 million for the same period in the prior year. The ~~decrease~~increase in rivers & lakes ~~revenue~~revenues for the ~~three and nine~~six months ended ~~September~~June 30, ~~2020~~2021 was mostly ~~attributable~~due to a greater amount of revenue earned ~~during~~on projects in Mississippi in the ~~prior~~current year ~~periods on a large flood mitigation project in Texas as a result of Hurricane Harvey, as well as a project in Louisiana,~~period, when compared to the ~~current~~prior year. This ~~decrease~~increase was partially offset by more revenue earned ~~on a~~in the San Jacinto project in ~~Mississippi~~Texas in the ~~current~~prior year.

Consolidated gross profit for the quarter ended ~~September~~June 30, ~~2020~~2021 was ~~$36.4~~$22.9 million, ~~up $4.6~~down $10.1 million, or ~~14%~~31% compared to ~~$31.8~~$33.0 million in the same quarter of ~~2019.~~2020. Gross profit margin for the three months ended ~~September~~June 30, ~~2020~~2021 was ~~20.7%~~13.5% compared to ~~18.7%~~19.7% in the ~~third~~second quarter of ~~2019.~~2020. The ~~higher~~lower gross profit experienced for the three months ended ~~September~~June 30, ~~2020~~2021 was driven by ~~an increase~~$3.0 million of direct costs related to the third wave of COVID-19 in addition to COVID-19 indirect costs and a decrease in profitability of the Company’s domestic capital and coastal protection dredging projects in the quarter when compared to the same period in the prior ~~year. This increase in domestic capital dredging profitability was~~year, offset slightly by higher gross profit in the maintenance, rivers & lakes and foreign capital ~~coastal protection, maintenance and rivers and lakes~~ dredging projects ~~during the same period~~ in the ~~prior year.~~ current quarter. Consolidated gross profit for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 was ~~$137.8~~ $56.0 million, ~~up $18.6~~down $45.5 million, or ~~16%~~45%, compared to ~~$119.2~~$101.5 million in the same period of the prior year. Gross profit margin for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~ 2021 was updown to ~~24.5%~~16.1% from ~~21.8%~~26.3% in the ~~nine months ended September 30, 2019.~~ same period in prior year. The ~~higher~~lower gross profit experienced for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 was driven by ~~an increase~~$7.3 million of direct costs related to the third wave of COVID-19 in ~~the~~addition to COVID-19 indirect costs and a decrease in profitability of the Company’s domestic capital, coastal protection and rivers & lakes dredging projects in the quarter when compared to the same period in the prior year, offset slightly by higher gross profit in the maintenance, and foreign capital dredging projects in the current year. ~~This increase in profitability was partially offset by higher gross profit results in the maintenance and rivers and lakes dredging projects during the same period in the prior year.~~

During the three and ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, general and administrative expenses were ~~$14.9~~$14.2 million and ~~$45.3~~$30.5 million, respectively, compared to the same periods in the prior year in which the three and ~~nine~~six months totaled ~~$13.5~~$14.8 million and ~~$42.9~~$30.4 million, respectively. ~~General and administrative expenses increased by $1.4 million and $2.4 million for~~For the three and ~~nine~~six months ended ~~September~~June 30, ~~2020, respectively, compared to the same periods of the prior year. The increase in~~2021, general and administrative expenses include higher technical and consulting expenses related to our engagement with Boston Consulting Group (“BCG”) to assist with evaluating the offshore wind market strategy as well as reviewing other long-term growth strategies for GLDD and higher relocation expense related to the ~~quarter was due~~headquarter move to ~~increased office rental expense and technical, consulting and office expenses, partially~~Texas. These increases were offset by ~~decreased~~lower incentive ~~pay. The increase in general~~pay and administrative expenses for the nine months ended September 30, 2020 over the same period in the prior year was driven by an increase in relocation, legal and office rental expenses, partially offset by a decrease in employee benefits.lower travel expenses.

Operating income for the ~~third~~second quarter of ~~2020~~2021 was ~~$23.2~~$8.8 million, ~~up $4.8~~down $9.5 million compared to operating income of ~~$18.4~~$18.3 million for the same quarter in ~~2019.~~2020. Operating income for the six months ended June 30, 2021 was $25.5 million, down $45.8 million from operating income of $71.3 million in the same period of prior year period. The ~~increase~~decrease in operating income for the ~~third quarter of 2020~~three and six months ended June 30, 2021 was a result of ~~higher~~lower gross profit in the current year when compared to the same period in the prior year. Proceeds from a loss of use claim of $1.7 million in the quarter contributed to the increase in the current year. This increase was partially offset by an increase in general and administrative expenses, as described above. Operating income for the nine months ended September 30, 2020 was $94.5 million, up $18.6 million from operating income of $75.9 million in the same prior year period. The increase in operating income for the nine months ended September 30, 2020 was a result of higher gross profit, as described above, an increase of $0.5 million in gain on sale of assets and the proceeds of a loss of use claim of $1.7 million. This increase was partially offset by higher general and administrative expense compared to the same period in the prior year, as described above.

For the three months ended ~~September~~June 30, ~~2020,~~2021, net interest expense was $6.7 million, ~~up $0.4~~relatively flat compared with $6.7 million ~~or 6%, from $6.3~~for the prior year quarter. Net interest expense the six months ended June 30, 2021 was $13.2 million, compared with $13.4 for the same period in the prior year. The ~~increase in~~net interest expense for the three and six months ended ~~September~~June 30, ~~2020 was attributable~~2021 includes a $1.0 million write-off to a decrease of $0.5 million in interest income partially offset by $0.1 million of capitalized interest in the current year when compared to the same period in the prior year. Net interest expense for the nine months ended September 30, 2020 was $20.1 million, down $1.0

million, or 5%, from interest expense of $21.1 million for the same period in the prior year. The decrease in interest expense for the nine months ended September 30, 2020 was attributable to a decrease of $0.5 million in extinguishment of subsidiary debt ~~and $0.6 million of amortization of~~related to the deferred financing fees ~~when compared to~~of the ~~prior year period. Additionally, $0.3~~redeemed 8.000% Senior Notes due 2022 (the “8% Notes”). This expense was offset by the lower interest expense from our newly issued $325 million of capitalized interest contributed to the decrease in the current year when compared to the prior year. These decreases were offset by a $0.6 million decrease in interest income when comparing the current year to the same period in the prior year.unsecured 5.25% Senior Notes (the “2029 Notes”).

Income tax provision for the three months ended ~~September~~June 30, ~~2020~~2021 was ~~$4.1~~$0.8 million compared to an income tax provision of ~~$3.2~~$3.1 million for the same period in the prior year. For the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 and ~~2019,~~2020, the Company had an income tax provision of ~~$18.5~~$2.2 million and ~~an income tax provision of $14.3~~$14.4 million, respectively. The effective tax rate for the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 was ~~25.0%~~16.9%, ~~mostly in line with~~down 8.3% from the effective tax rate of ~~25.9%~~25.2% for the same period of ~~2019.~~2020. The decrease in effective tax rate was primarily due to a one-time benefit associated with a stock compensation tax deduction in the current year.

Net income ~~from continuing operations~~ for the quarter ended ~~September~~June 30, ~~2020~~2021 was ~~$12.5~~$2.1 million, ~~up $3.7~~down $6.9 million, or ~~42%~~77%, from ~~$8.8~~$9.0 million in the same quarter in the prior year. Diluted earnings per share ~~attributable to continuing operations~~ was ~~$0.19~~$0.03 for the three months ended ~~September~~June 30, ~~2020,~~2021, compared to $0.14 for the three months ended ~~September~~June 30, ~~2019.~~2020. The ~~increase~~decrease in net income ~~from continuing operations~~ for the three months ended ~~September~~June 30, 2021 was due to the decrease in gross profit in current year quarter.Net income for the six months ended June 30, 2021 was $10.9 million, down $32.0 million, or 75%, from $42.9 million for the same period in the prior year. Diluted earnings per share attributable to continuing operations were $0.16 and $0.65 for the six months ended June 30, 2021 and 2020, respectively. The decrease in net income for the six months ended June 30, 2021 was driven by the ~~increase in~~decrease to gross profit ~~as described above, and the proceeds from a loss of use claim of $1.7 million.~~mostly. This increase was ~~partially~~slightly offset by ana $1.5 million increase ~~of interest expense and general and administrative expenses, as described above,~~in other income and a ~~$0.9~~$12.2 million ~~increase~~decrease in income tax provision during the current year when compared to the same period in the prior year. Net income from continuing operations for the nine months ended September 30, 2020 was $55.5 million, up $14.6 million, or 36%, from $40.9 million for the same period in the prior year. Diluted earnings per share attributable to continuing operations were $0.84 and $0.63 for the nine months ended September 30, 2020 and 2019, respectively. The increase in net income from continuing operations for the nine months ended September 30, 2020 was driven by the increase to gross profit, as described above, proceeds of a loss of use claim of $1.7 million, decrease of interest expense, as described above, and an increase of $0.5 million in gain on sale of assets. This increase was partially offset by an increase to general and administrative expense, as described above, a $4.2 million increase in income tax provision and an increase to other expense of $0.7 million during the current year when compared to the same period in the prior year.

Adjusted EBITDA ~~from continuing operations~~ (as defined on page 19) for the quarter ended ~~September~~June 30, ~~2020~~2021 was ~~$32.2~~$20.2 million, ~~up $5.1~~down $7.9 million, or ~~19%~~28%, from ~~$27.1~~$28.1 million in the ~~same quarter in the~~ prior ~~year.~~year quarter. The ~~increase~~decrease in Adjusted EBITDA ~~from continuing operations~~ during the ~~third~~second quarter of ~~2020~~2021 was driven by the ~~change~~decrease in gross profit, excluding depreciation, and the proceeds of the loss of use claim. This increase was offset by an increase of general and administrative expense, as described above, when comparing the current year to the same period in the prior year.depreciation. For the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, Adjusted EBITDA ~~from continuing operations~~ was ~~$121.7~~$47.1 million, ~~up $18.7~~down $42.4 million, or ~~18%~~47%, from ~~Adjusted EBITDA from continuing operations of $103.0~~$89.5 million ~~for the same prior year period. The increase in Adjusted EBITDA from continuing operations~~ during the first nine months of 2020 was attributable to higher gross profit, excluding depreciation, as described above and the proceeds from the loss of use claim, when compared to the prior year. These positive factors were partially offset by higher general & administrative expenses, as described above, and $0.7 million of other expense incurred in the current year when compared to the same period in the prior year.

The following table sets forth, by type of work, the Company’s backlog as of the dates indicated:

	September 30,		December 31,		September 30,		June 30,		December 31,		June 30,
Backlog (in thousands)	2020		2019		2019		2021		2020		2020
Dredging:
Capital - U.S.	$	411,621	$	347,377	$	410,671	$	320,820	$	320,920	$	345,901
Capital - foreign		11,050		30,571		37,900		269		6,865		19,717
Coastal protection		109,374		141,039		126,478		51,204		97,986		21,967
Maintenance		110,879		60,891		62,531		67,440		125,090		25,782
Rivers & lakes		18,357		9,528		16,153		14,669		8,515		10,036
Total Backlog	$	661,281	$	589,406	$	653,733
Total backlog							$	454,402	$	559,376	$	423,403

The Company’s contract backlog represents its estimate of the revenues that will be realized under the portion of the contracts remaining to be performed. These estimates are based primarily upon the time and costs required to mobilize the necessary assets to and from the project site, the amount and type of material to be dredged and the expected production capabilities of the equipment performing the work. However, these estimates are necessarily subject to variances based upon actual circumstances. Because of these factors, as well as factors affecting the time required to complete each job, backlog is not always indicative of future revenues or profitability. Also, 72% of the Company’s ~~September~~June 30, ~~2020~~2021 dredging backlog relates to federal government contracts, which can be canceled at any time without penalty to the government, subject to the Company’s contractual right to recover the Company’s actual committed costs and profit on work performed up to the date of cancellation. The Company’s backlog may fluctuate significantly from

quarter to quarter based upon the type and size of the projects the Company is awarded from the bid market. The Company’s backlog includes only those projects for which the Company has obtained a signed contract with the customer. A quarterly increase or decrease of the Company’s backlog does not necessarily result in an improvement or a deterioration of the Company’s business. As expected, the Company had several dry dock inspections in the third quarter of 2020, with many completing inspection and returned to service in the fourth quarter. Some vessels remained in dry dock at quarter end but are anticipated to be returned to service in the fourth quarter.

The domestic dredging bid market for the quarter ended ~~September~~June 30, ~~2020~~2021 was ~~$926.9~~$532.4 million, a ~~$91.1~~$103.8 million ~~decrease~~increase compared to the same period in the prior year. Total domestic dredging bid market for the current year period included awards for ~~additional phases~~the third phase of the ~~Jacksonville, Charleston and Corpus Christi deepening projects, two coastal restoration projects in Louisiana,~~Mobile Harbor Deepening project, the Golden Triangle Marsh Project, one maintenance ~~work on the Ohio and Mississippi River, hopper maintenance work on the West Coast and a liquefied natural gas (“LNG”) capital~~ project in ~~Louisiana. The bid market for~~ the ~~nine months ended September 30, 2020 increased compared to the prior year due to a greater amount of domestic capital and~~gulf region, one rivers ~~and~~& lakes ~~projects let to bid~~project in ~~the current year. This increase in domestic capital and rivers and lakes projects in the current period was partially offset by a greater amount of~~Tennessee, one coastal protection project and one maintenance ~~projects awarded~~project in ~~the same period in the prior year.~~Florida. For the contracts awarded in the current year, the Company won ~~57%~~65.9%, or ~~$308.7~~$148.1 million, of domestic capital projects, ~~68%~~and 36.3%, or ~~$131.1~~$44.1 million, of the coastal protection projects, ~~20%, or $158.7 million, of maintenance projects and 100%, or $32.1 million, of rivers & lakes projects~~ through ~~September~~June 30, ~~2020.~~2021. The Company won ~~40%~~34.5% of the overall domestic bid market for the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, which is ~~consistent with~~slightly lower than the Company’s prior three year average of ~~39%~~36.6%. Variability in contract wins from quarter to quarter is not unusual and one quarter’s win rate is generally not indicative of the win rate the Company is likely to achieve for a full year. After the end of the quarter, we were awarded the Cape May Beach Renourishment Project for $12.1 million and we were low bidder on the Corpus Christi Phase III Deepening Project for $151.9 million and the Thimble Shoal deepening and renourishment project for $39.5 million.

The Company’s contracted dredging backlog was ~~$661.3~~$454.4 million at ~~September~~June 30, ~~2020~~2021 compared to ~~$589.4~~$559.4 million of backlog at December 31, ~~2019.~~2020. These amounts do not reflect approximately ~~$177.9~~$508.6 million of domestic low bids pending formal award and additional phases (“options”) pending on projects currently in backlog at ~~September~~June 30, ~~2020.~~2021. At December 31, ~~2019~~2020 the amount of domestic low bids and options pending award was ~~$201.3~~$472.3 million.

Domestic capital dredging backlog at ~~September~~June 30, ~~2020~~2021 was ~~$64.2 million higher than~~ at the same level compared to December 31, ~~2019.~~2020. In the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company was awarded ~~an additional~~the third phase of the Jacksonville Deepening project for $105 million, an additional phase of the Charleston Deepening project for $53 million, three projects in Louisiana which consisted of two coastal restoration projects of $30 million and $28 million, respectively, and an LNG project for a private client.Boston Harbor deepening project. During the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company continued to earn revenue on deepening projects in Charleston, Jacksonville, and ~~Corpus Christi and~~the gulf region, a coastal restoration project in ~~Mississippi.~~ ~~At the end of last year, several LNG petro chemical~~Louisiana, and ~~crude oil export projects were being developed~~a liquefied natural gas project in the Gulf of Mexico creating the need for port development and navigational channel deepening and widening to accommodate the larger vessels involved in this trade. With the current economic environment in the oil and gas markets, some of these privately funded projects are expected to be impacted and delayed.Louisiana. Government funded projects coming into the pipeline include additional phases of the ~~Charleston, Jacksonville and~~ Corpus Christi deepenings, as well as new deepenings for ports in ~~Mobile,~~ Alabama and the Everglades in ~~Florida~~.Florida. These deepenings continue the trend of ensuring all East Coast and Gulf of Mexico ports will be able to accommodate the deeper draft vessels currently used on several trade routes. In addition, multiple project phases for port deepenings in Norfolk and the Houston ship channel are expected to continue for the next several years. The nation’s governors continue to show commitment to their respective ports through engagement and funding. Finally, Congress has also shown a commitment to ports and waterways, providing record annual budgets for the Corps for port deepening and channel maintenance. In addition to this port work, a greater amount of coastal restoration and rehabilitation projects are being funded in the Gulf Coast region as the states utilize available monies for ecosystem priorities, a portion of which is allocated to dredging.

Foreign capital dredging backlog at ~~September~~June 30, ~~2020~~2021 was ~~$19.5~~$6.6 million lower than at December 31, ~~2019.~~2020. During the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company continued to earn revenue on a project in the Middle East which was in backlog at December 31, ~~2019.~~2020.

Coastal protection dredging backlog decreased ~~$31.7~~$46.8 million from December 31, ~~2019.~~2020. In the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company was awarded two coastal protection projects of ~~$31 million in North Carolina, $24 million in New Jersey~~$28.5 and ~~$15~~$15.6 million in Florida. During the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company continued to earn revenue on coastal protection projects in New ~~York,~~Jersey, North Carolina, and Florida which were in backlog at December 31, ~~2019.~~2020. Coastal protection and storm impacts continue to provide the major impetus for coastal project investment at federal and state levels. Strong hurricane and storm seasons have resulted in an increase in beach erosion and other damage which adds to the recurring nature of our business and the need for more frequent coastal protection and port maintenance projects. As a result of the extreme storm systems in prior years involving Hurricanes Harvey, Irma, and Maria, the U.S. Congress passed supplemental appropriations for disaster relief and recovery which includes $17.4 billion for the Corps to fund projects that will reduce the risk of future damage from flood and storm events. The Corps is beginning to provide visibility on its plans for this money, and it is expected that approximately $1.8 billion will be allocated to dredging-related work. Most of this work is anticipated to be coastal protection related, but some funding may be provided for channel maintenance. During 2019, an additional $3.3 billion of supplemental appropriations was approved for disaster relief funding as a result of Hurricane Florence and Hurricane Michael.

Maintenance dredging backlog ~~increased $50.0~~decreased $57.6 million from December 31, ~~2019. The~~2020. In the six months ended June 30, 2021, the Company was awarded ~~a $45 million~~one maintenance project of $38.3 in ~~Louisiana~~the Gulf region and ~~an $18~~another one of $3.3 million ~~maintenance project in Maryland and Virginia during~~Florida. During the ~~nine~~six months ended ~~September~~June 30, ~~2020. During the nine months ended September 30, 2020,~~2021, the Company continued to earn revenue on projects in ~~Maryland,~~Louisiana, North Carolina and Florida which were in backlog at December 31, ~~2019. During the fourth quarter of 2018, the President signed America’s Water Infrastructure Act of 2018/Water Resources Development Act (“~~2020. Past WRDA ~~2018”) into law. Similar to past versions of the bill, WRDA 2018 language calls~~bills called for full use of the ~~Harbor Maintenance Trust Fund (“HMTF”)~~HMTF for its intended purpose of maintaining future access to the waterways and ports that support our nation’s economy. ~~Additionally, on~~On March 27, 2020, the U.S. government enacted the ~~Coronavirus Aid, Relief and Economic Security~~CARES Act ~~(the “CARES Act”)~~ which includes a provision that lifts caps on the HMTF, thereby allowing full access to future annual revenues. Through the increased appropriation of HMTF monies, the Company anticipates increased funding for harbor maintenance projects to be let for ~~bid throughout 2020 and beyond.~~bid.

Rivers & lakes backlog at ~~September~~June 30, ~~2020~~2021 was up ~~$8.8~~$6.2 million compared to backlog at December 31, ~~2019. During~~2020. In the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company was awarded ~~new work~~one rivers & lakes project in ~~Texas, Mississippi and Nebraska.~~Tennessee. For the ~~nine~~six months ended ~~September~~June 30, ~~2020,~~2021, the Company continued to earn revenue on ~~a large project~~projects in Texas and Mississippi which was in backlog at December 31, ~~2019. Additionally, the Company earned revenue on a project in Mississippi during the current year period.~~2020.

The Company’s principal sources of liquidity are net cash flows provided by operating activities and proceeds from previous issuances of long-term debt. The Company’s principal uses of cash are to meet debt service requirements, finance capital expenditures, provide working capital and other general corporate purposes.

The Company’s cash provided by or used in operating activities ~~of continuing operations~~ for the ~~nine~~six months ended ~~September~~June 30, 2021 and 2020 ~~and 2019 totaled $76.0~~was a use of $35.6 million and ~~$182.0~~a source of $67.5 million in cash, respectively. Normal increases or decreases in the level of working capital relative to the level of operational activity impact cash flow from operating activities. The decrease in cash provided by operating activities ~~of continuing operations~~ during the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 compared to the same period in the prior year was driven by ~~billings and collections on large projects during the prior period as well as an increase~~lower net income in current year, offset partially by lower investment in working capital ~~due to an increase in receivables~~ during the current year when ~~compared to the same period in the prior year. Further, this decrease was offset by an increase of $14.6 million in net income from continuing operations in the current period~~ compared to the same period in the prior year.

The Company’s cash flows used in investing activities for the ~~nine~~six months ended ~~September~~June 30, 2021 and 2020 ~~and 2019~~ totaled ~~$29.2~~$64.6 million and ~~$32.1~~$20.1 million, respectively. Investing activities primarily relate to normal course upgrades and capital maintenance of the Company’s dredging fleet. ~~In the second quarter of~~The Company announced a Shipyard Contract for 6,500 cubic yard Trailing Suction Hopper Dredge in June 2020 and, later, in December 2020 the Company announced the design and ~~made a down payment~~development of the first U.S. flagged Jones Act compliant, inclined fall-pipe vessel for ~~a contract~~subsea rock installation for wind turbine foundations to ~~build a 6,500 cubic yard trailing suction hopper dredge with expected delivery~~support the new U.S. offshore wind industry. During the six months ended June 30, 2021, the Company has invested $14.0 million towards these new vessels. In addition, the Company spent $16.4 million in the ~~first quarter of 2023. Proceeds~~period ended June 30, 2021 to acquire two dredges that had previously been leased and $6.9 million to acquire

two multifunctional all-purpose vessels (“multicats”). The Company did not receive any proceeds from dispositions of property and equipment in the ~~prior~~current year period ~~was $5.6 million~~ compared to ~~$0.9~~$0.4 million in the ~~current year.~~prior year period.

The Company’s cash flows used in financing activities for the ~~nine~~six months ended ~~September~~June 30, 2021 and 2020 ~~and 2019~~ totaled ~~$4.1~~$6.7 million and ~~$12.7~~$0.8 million, respectively. The ~~decrease~~increase in cash used in financing activities ~~primarily~~ relates to $4.4 million of deferred financing fees paid related to the newly issued $325 million of the 2029 Notes and changes in the ~~net repayments~~taxes paid on settlement of vested shares awards, offset slightly by increase cash from the Company’s ~~revolving credit facility in the prior period of $11.5 million compared to none in the current year.~~employee stock purchase plan. Of the previously announced $75.0 million share repurchase program, the Company repurchased $3.9 million of common stock in the third quarter of ~~2020.~~2020 and none during the period ended June 30, 2021.

The Company maintains a favorable cash on hand position and revolver availability and as a result is well positioned for changes in the current economic environment. ~~To date,~~In the current year, the Company ~~has had no significant~~began to experience more considerable operational ~~or financial impact as a result~~interruptions and direct costs related to the third wave of the ~~ongoing~~ coronavirus (COVID-19) ~~pandemic~~pandemic. The impacted projects are now back in operation but the Company will continue to assess the potential economic impact that the virus and pandemic could have on the Company’s operations and liquidity.

In May ~~2017,~~2021 the Company ~~issued~~sold $325 million inof 2029 Notes pursuant to a private offering. The 2029 Notes were priced to investors at par and will mature on June 1, 2029. The Company used the net proceeds from the offering, together with cash on hand, to redeem all $325 million aggregate principal amount of its outstanding 8% ~~Senior Notes due May 15, 2022. Interest on the 8% Senior Notes is payable semi-annually in arrears on May 15 and November 15 of each year, beginning on November 15, 2017.~~ Notes.

The ~~8% Senior~~2029 Notes are senior unsecured obligations of the Company and are guaranteed on a senior unsecured basis by the guarantors and any other subsidiary guarantors that from time to time become parties to the indenture. The terms of the indenture, among other things, limit the ability of the Company and its restricted subsidiaries to (i) pay dividends, or make certain other restricted payments or investments; (ii) incur additional indebtedness and issue disqualified stock; (iii) create liens on their assets; (iv) transfer and sell assets; (v) enter into certain business combinations with third parties or enter into certain other transactions with affiliates; (vi) create restrictions on dividends or other payments by the Company’s restricted subsidiaries; and (vii) create guarantees of indebtedness by restricted subsidiaries. These covenants are subject to a number of important limitations and exceptions that are described in the indenture.

Refer to Note 4, Long-term debt, in the Notes to Condensed Consolidated Financial Statements for discussion of the Company’s Amended Credit Agreement. Additionally, refer to Note 8, Commitments and contingencies, in the Notes to Condensed Consolidated Financial Statements for discussion of the Company’s surety agreements.

The Company intends to upgrade its existing domestic fleet by acquiring new vessels, equipment and technology to increase productivity and efficiency and further enhance safety. Existing cash on hand, future net cash flows, debt financing and new leases are all available funding resources from which the Company will evaluate its options when considering these upgrades.

The Company believes its cash and cash equivalents, its anticipated cash flows from operations and availability under its revolving credit facility will be sufficient to fund the Company’s operations, capital expenditures and the scheduled debt service requirements for the next twelve months. Beyond the next twelve months, the Company’s ability to fund its working capital needs, planned capital expenditures, scheduled debt payments and dividends, if any, and to comply with all the financial covenants under the Amended Credit Agreement and bonding agreements, depends on its future operating performance and cash flows, which in turn, are subject to prevailing economic conditions and to financial, business and other factors, some of which are beyond the Company’s control.

In preparing its consolidated financial statements, the Company follows GAAP, which is described in Note 1, Basis of presentation, to the Company’s December 31, ~~2019~~2020 Consolidated Financial Statements included on Form 10-K. The application of these principles requires significant judgments or an estimation process that can affect the results of operations, financial position and cash flows of the Company, as well as the related footnote disclosures. The Company continually reviews its accounting policies and financial information disclosures. Except as noted in Note 1, Basis of presentation, of the Company’s financial statements, there have been no material changes in the Company’s critical accounting policies or estimates since December 31, ~~2019.~~2020.

The market risk of the Company’s financial instruments as of ~~September~~June 30, ~~2020~~2021 has not materially changed since December 31, ~~2019.~~2020. The market risk profile of the Company on December 31, ~~2019~~2020 is disclosed in Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” of the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2019.~~2020.

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Company’s disclosure controls and procedures, as required by Rule 13a-15(b) and 15d-15(b) under the Securities Exchange Act of 1934 (the “Exchange Act”) as of ~~September~~June 30, ~~2020.~~2021. Our disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports that we file or submit under the Exchange Act a) is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding disclosure and b) is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms.

Our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective as of ~~September~~June 30, ~~2020~~2021 in providing such a reasonable assurance.

There have been no changes in our internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) during the fiscal quarter ended ~~September~~June 30, ~~2020~~2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

See Note 8, Commitments and contingencies, in the Notes to Condensed Consolidated Financial Statements.

There have been no material changes, except for the following, during the ~~nine~~six months ended ~~September~~June 30, ~~2020~~2021 to the risk factors previously disclosed in Item 1A. “Risk Factors” in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2019,~~2020, as supplemented by the risk ~~factors~~factor previously disclosed in Item 1A. “Risk Factors” in the Company’s Quarterly ~~Reports~~Report on Form 10-Q for the ~~quarters~~quarter ended ~~March 31, 2020 and~~ June 30, ~~2020.~~2021.

~~We may experience unexpected difficulties~~The Company could face liabilities and/or damage to our reputation as a result of certain legal and ~~incur unexpected costs~~regulatory proceedings, including a recent legal proceeding in Louisiana.

The Company operates in a highly regulated environment with constantly evolving legal and regulatory frameworks. From time to time, the Company is subject to legal and regulatory proceedings in the ~~relocation~~ordinary course of ~~our headquarters from Oakbrook, Illinois~~its business. These include proceedings relating to ~~Houston, Texas.~~aspects of its businesses that are specific to the Company and proceedings that are typical in the businesses in which it operates.

In ~~October 2020, we announced that we would relocate our headquarters from Oakbrook, Illinois to Houston, Texas. The objectives~~particular, on April 22, 2021, the U.S. Attorney’s Office for the Eastern District of Louisiana filed a bill of information against the Company charging the Company with a negligent discharge violation of the ~~relocation~~Clean Water Act arising from a September 2016 oil spill. The spill occurred during the Company’s Cheniere Ronquille project and resulted in the discharge of around 160 barrels of crude oil in Bay Long, Louisiana. The Company has cooperated with the U.S. Attorney’s Office and other relevant agencies in their investigation of the oil spill and has agreed to plead guilty to the misdemeanor violation alleged in the bill of information. As a result, the government may initiate suspension or debarment proceedings against us, which might prohibit us from bidding for, entering into or completing certain government projects. These suspension or debarment actions may be limited in time and scope, but the Company cannot guarantee that any such action will not have a material adverse effect on its business, results of operations, cash flows or financial condition. In addition, this matter may lead to negative publicity and press speculation about the Company, whether valid or not, which may harm our reputation and be damaging to our business, results of operations, cash flows or financial condition.

The Company is currently a defendant in a number of other litigation matters, including ~~securing more public~~those described in Note 8, Commitments and ~~private~~contingencies, in the Notes to Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q. In certain of these matters, the plaintiffs are seeking large and/or indeterminate amounts of damages. These matters are also subject to many uncertainties, and it is possible that some of these matters could ultimately be decided, resolved or settled adversely to the Company. An adverse outcome in a legal or regulatory matter could, depending on the facts, have an adverse effect on the Company’s business, ~~opportunities~~results of operations, cash flows or financial condition.

Furthermore, whether the ultimate outcomes are favorable or unfavorable, these matters can also have significant adverse reputational impacts, including negative publicity and ~~attracting and retaining a specialized workforce~~press speculation about the Company, whether valid or not, which may ~~not materialize~~be damaging to the Company’s ~~expectations~~business, results of operations, cash flows or as the Company envisions. There is a possibility that some members of senior management and key employees will decide to leave the Company instead of moving to Houston. The loss of services of members of senior management or other key employees could significantly delay or prevent the achievement of our strategic objectives and could adversely affect our business, financial ~~condition and operating results. In addition, actual costs related to the relocation may exceed our estimates.~~condition.

The following table ~~summarizes~~provides information regarding repurchases of ~~our~~the Company’s common stock by the Company during the ~~three months~~quarter ended ~~September~~June 30, ~~2020.~~

Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Aggregate Dollar Value That May Yet Be Purchased Under the Plans or Programs (1)		Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Aggregate Dollar Value That May Yet Be Purchased Under the Plans or Programs (1)
August 1, 2020 – August 31, 2020		—	$	—		—	$	75,000,000
September 1, 2020 - September 30, 2020		424,739	$	9.09		424,739	$	71,140,429
April 1, 2021 – April 30, 2021										0	$	-		0	$	71,127,473
May 1, 2021 - May 31, 2021										0	$	-		0	$	71,127,473
June 1 2021 - June 30, 2021										0	$	-		0	$	71,127,473
Total		424,739	$	9.09		424,739	$	71,140,429		0	$	-		0	$	71,127,473

~~(1)~~ ~~Portions of this exhibit have been omitted pursuant to Rule 601(b)(10) of Regulation S-K.~~

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Delaware		20-5336063
(State or other jurisdiction of incorporation or organization)		(I.R.S. Employer Identification No.)

~~1 ParkviewPlaza, Oakbrook Terrace, IL~~9811 Katy Freeway, Suite 1200, Houston, TX		~~60181~~77024
(Address of principal executive offices)		(Zip Code)


Title of each class	~~Trading Symbol(s)~~	Trading Symbol(s)	Name of each exchange on which registered
Common Stock (Par Value $0.0001)		GLDD	Nasdaq Stock Market, LLC

		Page

	Part I Financial Information (Unaudited)	3

Item 1	Financial Statements	3

	Condensed Consolidated Balance Sheets at ~~September~~June 30, ~~2020~~2021 and December 31, ~~2019~~2020	3

	Condensed Consolidated Statements of Operations for the Three and ~~Nine~~Six Months ended ~~September~~June 30, ~~2020~~2021 and ~~2019~~2020	4

	Condensed Consolidated Statements of Comprehensive Income for the Three and ~~Nine~~Six Months ended ~~September~~June 30, ~~2020~~2021 and ~~2019~~2020	5

	Condensed Consolidated Statements of Equity for the Three and ~~Nine~~Six Months ended ~~September~~June 30, ~~2020~~2021 and ~~2019~~2020	6

	Condensed Consolidated Statements of Cash Flows for the ~~Nine~~Six Months Ended ~~September~~June 30, ~~2020~~2021 and ~~2019~~2020	7

	Notes to Condensed Consolidated Financial Statements	98

Item 2	Management’s Discussion and Analysis of Financial Condition and Results of Operations	1715

Item 3	Quantitative and Qualitative Disclosures About Market Risk	2522

Item 4	Controls and Procedures	2523

	Part II Other Information	2624

Item 1	Legal Proceedings	2624

Item 1A	Risk Factors	2624

Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	2624

Item 3	Defaults Upon Senior Securities	2625

Item 4	Mine Safety Disclosures	2625

Item 5	Other Information	2625

Item 6	Exhibits	2726

	Signature	2827

Number			Document Description

~~31.1~~4.1			Indenture, dated May 25, 2021, among Great Lakes Dredge & Dock Corporation, as Issuer, the guarantors party thereto, and Wells Fargo Bank, National Association, as Trustee, relating to the 2029 Notes (incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on May 25, 2021 (Commission file no. 001-33225))

4.2			Form of 2029 Notes (included in Exhibit 4.1) (incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on May 25, 2021 (Commission file no. 001-33225))

10.1			Great Lakes Dredge & Dock Corporation 2021 Long-Term Incentive Plan (incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on May 7, 2021 (Commission file no. 001-33225)) †

10.2			Purchase Agreement, dated May 12, 2021, by and among Great Lakes Dredge & Dock Corporation, certain subsidiary guarantors named therein and BofA Securities, Inc., as representative of the initial purchasers named therein. (incorporated by reference to Great Lakes Dredge & Dock Corporation’s Current Report on Form 8-K filed with the Commission on May 18, 2021 (Commission file no. 001-33225)) †

31.1			Certification Pursuant to Rules 13a-14 and 15d-14 under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. *

31.2			Certification Pursuant to Rules 13a-14 and 15d-14 under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. *

32.1			Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. **

32.2			Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. **

101			Interactive Data Files pursuant to Rule 405 of Regulation S-T formatted in Inline Extensible Business Reporting Language ("Inline XBRL")*

104			Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101) *

	Great Lakes Dredge & Dock Corporation
	(registrant)

	By:		/s/ Mark W. Marinko
			Mark W. Marinko
			Senior Vice President and Chief Financial Officer
			(Principal Financial and Accounting Officer and Duly Authorized Officer)

Large accelerated filer	☐	Accelerated filer	☒
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

	Three Months Ended				Six Months Ended
(shares in thousands)	June 30,				June 30,
	2021		2020		2021		2020

Net income	$	2,105	$	8,960	$	10,919	$	42,947

Weighted-average common shares outstanding — basic		65,646		64,864		65,458		64,659
Effect of stock options and restricted stock units		491		894		729		1,143

Weighted-average common shares outstanding — diluted		66,137		65,758		66,187		65,802

Earnings per share — basic	$	0.03	$	0.14	$	0.17	$	0.66
Earnings per share — diluted	$	0.03	$	0.14	$	0.16	$	0.65