Rambus Inc.

Supplemental Reconciliation of GAAP to Non-GAAP Results

(Unaudited)

Three Months Ended

June 30,

(In thousands)

2021

2020

Cost of product revenue

$

11,422

$

10,277

Adjustment:

Stock-based compensation expense

(70)

—

Non-GAAP cost of product revenue

$

11,352

$

10,277

Total operating expenses

$

53,882

$

56,657

Adjustments:

Stock-based compensation expense

(7,228)

(6,707)

Acquisition-related costs and retention bonus expense

(2,200)

(1,577)

Amortization of acquired intangible assets

(229)

(248)

Expense on abandoned operating leases

(521)

—

Facility restoration costs

—

(411)

Non-GAAP total operating expenses

$

43,704

$

47,714

Interest and other income (expense), net

$

(302)

$

2,108

Adjustments:

Interest income related to significant financing component from fixed-fee patent and
technology licensing arrangements

(2,382)

(3,788)

Non-cash interest expense on convertible notes

1,901

1,798

Non-GAAP interest and other income (expense), net

$

(783)

$

118