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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock-Based Compensation Expense Related to Stock Options, RSUs and Restricted Stock

The following table summarizes the RSUs and restricted stock outstanding as of December 31, 2022 and June 30, 2023 and the changes that occurred during the six months ended June 30, 2023:

 

 

 

Number of
Shares
(in thousands)

 

 

Weighted Avg. Grant Date Fair Value
(per share)

 

Unvested RSUs and restricted stock outstanding, December 31, 2022

 

 

1,086

 

 

$

17.54

 

RSUs and restricted stock granted

 

 

1,484

 

 

$

16.33

 

RSUs and restricted stock vested

 

 

(52

)

 

$

20.36

 

RSUs and restricted stock forfeited

 

 

(27

)

 

$

16.11

 

Unvested RSUs and restricted stock outstanding, June 30, 2023

 

 

2,491

 

 

$

17.02

 
Summary of Stock Options Outstanding

The following table summarizes the ADTRAN Holdings, Inc. stock options outstanding as of December 31, 2022 and June 30, 2023 and the changes that occurred during the six months ended June 30, 2023:

 

 

Number of
Stock Options
(in thousands)

 

 

Weighted Avg.
Exercise Price
(per share)

 

 

Weighted Avg.
Remaining
Contractual
Life
(in years)

 

 

Aggregate
Intrinsic Value
(in thousands)

 

Stock options outstanding, December 31, 2022

 

 

3,148

 

 

$

14.37

 

 

 

3.42

 

 

$

16,251

 

Stock options granted

 

 

8

 

 

$

12.17

 

 

 

 

 

 

 

Stock options exercised

 

 

(6

)

 

$

9.82

 

 

 

 

 

 

 

Stock options forfeited

 

 

(36

)

 

$

12.24

 

 

 

 

 

 

 

Stock options expired

 

 

(26

)

 

$

15.46

 

 

 

 

 

 

 

Stock options outstanding, June 30, 2023

 

 

3,088

 

 

$

14.39

 

 

 

2.93

 

 

$

2,582

 

Stock options exercisable, June 30, 2023

 

 

1,701

 

 

$

15.89

 

 

 

1.48

 

 

$

1,514

 
Adtran Networks SE [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Summary of Stock Options Outstanding

The following table summarizes the Adtran Networks stock options outstanding as of December 31, 2022 and June 30, 2023 and the changes that occurred during the six months ended June 30, 2023:

 

 

 

Number of
Options
(In thousands)

 

 

Weighted
Average
Exercise Price
(Per share)

 

 

Weighted Avg.
Remaining
Contractual Life
in Years

 

 

Aggregate
Intrinsic Value
(In thousands)

 

Stock options outstanding, December 31, 2022

 

 

81

 

 

$

8.58

 

 

 

4.00

 

 

$

1,222

 

Stock options exercised

 

 

(12

)

 

$

8.47

 

 

 

 

 

 

 

Stock options expired

 

 

(1

)

 

$

9.49

 

 

 

 

 

 

 

Stock options outstanding, June 30, 2023

 

 

68

 

 

$

8.77

 

 

 

3.88

 

 

$

865

 

Stock options exercisable, June 30, 2023

 

 

13

 

 

$

6.41

 

 

 

1.39

 

 

$

197