Great Lakes Dredge & Dock Corporation

Schedule II—Valuation and Qualifying Accounts

For the Years Ended December 31, 2023, 2022 and 2021

(In thousands)

Beginning
Balance

Additions

Deductions

Ending
balance

Description

Year ended December 31, 2021

Allowances deducted from assets to which they apply:

Allowances for doubtful accounts

$

564

$

—

$

—

$

564

Valuation allowance for deferred tax assets

2,473

14

—

2,487

Total

$

3,037

$

14

$

—

$

3,051

Year ended December 31, 2022

Allowances deducted from assets to which they apply:

Allowances for doubtful accounts

$

564

$

—

$

—

$

564

Valuation allowance for deferred tax assets

2,487

3,525

—

6,012

Total

$

3,051

$

3,525

$

—

$

6,576

Year ended December 31, 2023

Allowances deducted from assets to which they apply:

Allowances for doubtful accounts

$

564

$

—

$

200

$

364

Valuation allowance for deferred tax assets

6,012

546

—

6,558

Total

$

6,576

$

546

$

200

$

6,922