Year Ended December 31,

2021

2022

2023

(In US$ thousands, except share data and per share data)

Basic net income per share calculation:

Numerator:

Net income attributable to Weibo’s shareholders

$

428,319

$

85,555

$

342,598

Denominator:

Weighted average ordinary shares outstanding

228,814

235,164

235,560

Basic net income per share attributable to Weibo’s shareholders

$

1.87

$

0.36

$

1.45

Diluted net income per share calculation:

Numerator:

Net income attributable to Weibo

$

428,319

$

85,555

$

342,598

Add: Effect on interest expenses and amortized issuance cost of convertible senior notes

—

529

Net income attributable to Weibo’s shareholders for calculating diluted net income per share

428,319

85,555

343,127

Denominator:

Weighted average ordinary shares outstanding

228,814

235,164

235,560

Effects of dilutive securities

Stock options

68

—

14

Unvested restricted share units

1,324

1,243

2,625

Convertible senior notes

—

1,775

Shares used in computing diluted net income per share attributable to Weibo’s shareholders

230,206

236,407

239,974

Diluted net income per share attributable to Weibo’s shareholders

$

1.86

$

0.36

$

1.43