CLNE · Clean Energy Fuels Corp.

Shares purchased in multiple transactions at prices ranging from $1.745 to $1.75, inclusive. The price reported in Column 4 is a weighted average purchase price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the ranges set forth in this footnote.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Shares purchased in multiple transactions at prices ranging from $1.77 to $1.78, inclusive. The price reported in Column 4 is a weighted average purchase price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each price within the ranges set forth in this footnote.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Shares sold in multiple transactions at prices ranging from $2.03 to $2.08, inclusive. The price reported in Column 4 is a weighted average sale price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in this footnote.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

This amount includes an increase of 52,800 shares that were inadvertently omitted from previous reports.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock.

Shares were sold in multiple transactions at prices ranging from $2.6050 to $2.6550. The price reported in Column 4 is a weighted average sale price. The Reporting Person undertakes to provide to the Issuer, any security holder of Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the range set forth in this footnote.

Shares sold in multiple transactions at prices ranging from $2.20 to $2.28, inclusive. The price reported in Column 4 is a weighted average sale price. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each price within the ranges set forth in this footnote.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

100% of the total shares subject to the option fully vest on the first anniversary of the date of the grant.

100% of the total shares subject to the option fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

100% of the total shares subject to the option fully vest on the first anniversary of the date of the grant.

100% of the total shares subject to the option fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents a gift of RSUs for no consideration. Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

100% of the total shares subject to the RSU fully vest on the first anniversary of the date of the grant.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

Represents shares withheld to satisfy tax withholding obligations upon the vesting of restricted stock units.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Represents an award of restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's common stock upon the vesting and settlement of the RSU.

The RSUs will vest as to 34% on the first anniversary of the grant date and as to 33% on each of the second and third anniversaries of the grant date.

Represents a target number of price hurdle performance stock units. These performance stock units will vest in installments upon the Company's common stock achieving specified price per share targets ranging from 1.25 to 2.0 times the Company's price per share on the grant date during a three-year performance period. If the minimum price per share target is not achieved prior to the end of the three-year performance period, none of the performance stock units will vest.

Represents a target number of price hurdle performance stock units. These performance stock units will vest in installments upon the Company's common stock achieving specified price per share targets ranging from 1.25 to 2.0 times the Company's price per share on the grant date during a three-year performance period. If the minimum price per share target is not achieved prior to the end of the three-year performance period, none of the performance stock units will vest.