Three months ended September 30,

Nine months ended September 30,

2019

2018

2019

2018

(in thousands, except per share amounts)

Net income (loss)

$

(11,767)

$

(8,953)

$

(45,862)

$

(262,414)

Net income (loss) per common share:

Basic

$

(0.25)

$

(0.19)

$

(0.97)

$

(5.55)

Diluted

$

(0.25)

$

(0.19)

$

(0.97)

$

(5.55)

Basic weighted average shares outstanding

47,489

46,982

47,361

47,283

Effect of potentially dilutive share-based awards

—

Diluted weighted average shares outstanding

47,489

46,982

47,361

47,283

Common share equivalents excluded from the diluted weighted average shares outstanding since Veeco incurred a net loss and their effect would be antidilutive

403

16

302

17

Potentially dilutive shares excluded from the diluted calculation as their effect would be antidilutive

1,874

2,617

1,893

2,469

Maximum potential shares to be issued for settlement of the Convertible Senior Notes excluded from the diluted calculation as their effect would be antidilutive

8,618