Rambus Inc.

Supplemental Reconciliation of GAAP to Non-GAAP Results

(In thousands)

(Unaudited)

Three Months Ended

December 31,

2019

2018

Operating costs and expenses

$

73,158

$

72,763

Adjustments:

Stock-based compensation expense

(4,819)

(6,145)

Acquisition-related/divestiture costs and retention bonus expense

(4,250)

—

Amortization expense

(3,962)

(4,989)

Restructuring and other charges (recoveries)

(4,588)

6

Facility restoration costs

(959)

—

Recovery of assets held for sale

7,698

—

Non-GAAP operating costs and expenses

$

62,278

$

61,635

Interest and other income (expense), net

$

3,713

$

3,997

Adjustments:

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

(4,469)

(6,147)

Non-cash interest expense on convertible notes

1,749

1,655

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

$

993

$

(495)

Rambus Inc.

Reconciliation of GAAP Forward Looking Estimates to Non-GAAP Forward Looking Estimates

(In millions)

(Unaudited)

Three Months Ended
March 31, 2020

Low

High

Forward-looking operating costs and expenses

$

80.0

$

76.0

Adjustments:

Stock-based compensation expense

(7.0)

(7.0)

Amortization expense

(5.0)

(5.0)

Forward-looking Non-GAAP operating costs and expenses

$

68.0

$

64.0

Forward-looking interest and other income (expense), net

$

4.6

$

4.6

Adjustments:

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

(5.3)

(5.3)

Non-cash interest expense on convertible notes

1.7

1.7

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

$

1.0

$

1.0