DLB

This option was granted for a total of 46,000 shares of Class A Common Stock. The option exercised in this transation was fully vested and exercisable as of the transaction date.

The shares were sold in multiple transactions at prices ranging from $52.96 to $53.50, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold in multiple transactions at prices ranging from $55.15 to $56.105 , inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 3, 2026.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

This option was granted for a total of 46,000 shares of Class A Common Stock. The option exercised in this transation was fully vested and exercisable as of the transaction date.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares include 374 shares acquired under the Issuer's Employee Stock Purchase Plan on May 15, 2026.

The shares were sold in multiple transactions at prices ranging from $54.315 to $55.08 , inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

Shares held following the reported transaction includes 41,480 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

In accordance with Rule 16b-3, shares reported as disposed of were withheld by the Issuer in a transaction exempt from Section 16(b) and not issued to the reporting person in order to cover withholding taxes incidental to the vesting of restricted stock units.

Shares held following the reported transactions include 46,938 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold pursuant to a 10b5-1 trading plan adopted on August 22, 2025.

Shares held following the reported transactions include 59,172 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares include 385 shares acquired under the Issuer's Employee Stock Purchase Plan on May 15, 2026.

The shares were sold in multiple transactions at prices ranging from $56.335 to $57.13 , inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

Shares held following the reported transaction includes 48,874 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transaction includes 48,874 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold in multiple transactions at prices ranging from $58.195 to $58.36, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 3, 2026.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

This option was granted for a total of 46,000 shares of Class A Common Stock. The option exercised in this transation was fully vested and exercisable as of the transaction date.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold in multiple transactions at prices ranging from $57.16 to $58.05 , inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 3, 2026.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transactions include 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transaction included 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares of Class B Common Stock are convertible, at no cost, at any time at the election of the holder into shares of Class A Common Stock on a 1-for-1 basis.

On February 25, 2025, the Dagmar Dolby Trust (as defined below) converted 10,000 shares of Class B Common Stock into a like number of shares of Class A Common Stock and gifted all such shares of Class A Common Stock to an unaffiliated charitable organization. The gift transaction is exempt from Section 16(b) by virtue of Rule 16b-5 promulgated under the Act.

Reflects shares held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby, son of Dagmar Dolby, as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Shares of Class B Common Stock are convertible, at no cost, at any time at the election of the holder into shares of Class A Common Stock on a 1-for-1 basis.

On February 25, 2026, the Dagmar Dolby Trust contributed 1,000,000 shares of Class B Common Stock to a newly formed grantor retained annuity trust, the Dagmar Dolby 2026 Trust AA (as defined below). Such share contribution was effected solely for tax and estate planning purposes, and was a transfer for no value without the payment or receipt of any funds or other consideration by any reporting person in exchange therefor. As a change in form of indirect beneficial ownership only, applicable rules consider such a share contribution to be exempt from the reporting requirements of Section 16(a) and the provisions of Section 16(b) of the Act, and as a result the reporting persons are voluntarily reporting such share contribution on this Form 4.

Reflects shares held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby, son of Dagmar Dolby, as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Shares of Class B Common Stock are convertible, at no cost, at any time at the election of the holder into shares of Class A Common Stock on a 1-for-1 basis.

On February 25, 2026, the Dagmar Dolby Trust contributed 1,000,000 shares of Class B Common Stock to a newly formed grantor retained annuity trust, the Dagmar Dolby 2026 Trust AA (as defined below). Such share contribution was effected solely for tax and estate planning purposes, and was a transfer for no value without the payment or receipt of any funds or other consideration by any reporting person in exchange therefor. As a change in form of indirect beneficial ownership only, applicable rules consider such a share contribution to be exempt from the reporting requirements of Section 16(a) and the provisions of Section 16(b) of the Act, and as a result the reporting persons are voluntarily reporting such share contribution on this Form 4.

Reflects shares of Class B Common Stock (convertible into a like number of shares of Class A Common Stock) held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby 2026 Trust AA, dated February 25, 2026 (the "Dagmar Dolby 2026 Trust AA"), voting power over which is held by David E. Dolby as Special Trustee of the Dagmar Dolby 2026 Trust AA. This report is filed by Dagmar Dolby with respect to the securities held by the Dagmar Dolby 2026 Trust AA. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

On February 25, 2025, the Dagmar Dolby Trust (as defined below) converted 10,000 shares of Class B Common Stock into a like number of shares of Class A Common Stock and gifted all such shares of Class A Common Stock to an unaffiliated charitable organization. The gift transaction is exempt from Section 16(b) by virtue of Rule 16b-5 promulgated under the Act.

Reflects shares held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby, son of Dagmar Dolby, as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Each share of Class A Common Stock was issued upon conversion of one share of Class B Common Stock at the election of, and at no cost to, the reporting person.

On February 25, 2025, the Dagmar Dolby Trust (as defined below) converted 10,000 shares of Class B Common Stock into a like number of shares of Class A Common Stock and gifted all such shares of Class A Common Stock to an unaffiliated charitable organization. The gift transaction is exempt from Section 16(b) by virtue of Rule 16b-5 promulgated under the Act.

Reflects shares held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby, son of Dagmar Dolby, as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Shares held following the reported transactions include 59,172 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transactions include 19,303 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold in multiple transactions at prices ranging from $66.37 to $66.39, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

Shares held following the reported transactions include 19,303 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

This option was granted for a total of 2,667 shares of Class A Common Stock. The option exercised in this transation was fully vested and exercisable as of the transaction date.

Each share of Class A Common Stock was issued upon conversion of one share of Class B Common Stock at the election of, and at no cost to, the reporting person.

On February 11, 2026, the Dagmar Dolby Trust (as defined below) converted 380,000 shares of Class B Common Stock into a like number of shares of Class A Common Stock and gifted all such shares of Class A Common Stock to an unaffiliated charitable organization. The conversion transactions are exempt from Section 16(b) of the Securities Exchange Act of 1934 (the "Act") pursuant to Rule 16b-6(b) promulgated under the Act. The gift transaction is exempt from Section 16(b) by virtue of Rule 16b-5 promulgated under the Act.

Reflects shares of Class B Common Stock (as converted or convertible, as applicable, into a like number of shares of Class A Common Stock) held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

On February 11, 2026, the Dagmar Dolby Trust (as defined below) converted 380,000 shares of Class B Common Stock into a like number of shares of Class A Common Stock and gifted all such shares of Class A Common Stock to an unaffiliated charitable organization. The conversion transactions are exempt from Section 16(b) of the Securities Exchange Act of 1934 (the "Act") pursuant to Rule 16b-6(b) promulgated under the Act. The gift transaction is exempt from Section 16(b) by virtue of Rule 16b-5 promulgated under the Act.

Reflects shares of Class B Common Stock (as converted or convertible, as applicable, into a like number of shares of Class A Common Stock) held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Shares of Class B Common Stock are convertible, at no cost, at any time at the election of the holder into shares of Class A Common Stock on a 1-for-1 basis.

On February 11, 2026, the Dagmar Dolby Trust (as defined below) converted 380,000 shares of Class B Common Stock into a like number of shares of Class A Common Stock and gifted all such shares of Class A Common Stock to an unaffiliated charitable organization. The conversion transactions are exempt from Section 16(b) of the Securities Exchange Act of 1934 (the "Act") pursuant to Rule 16b-6(b) promulgated under the Act. The gift transaction is exempt from Section 16(b) by virtue of Rule 16b-5 promulgated under the Act.

Reflects shares of Class B Common Stock (as converted or convertible, as applicable, into a like number of shares of Class A Common Stock) held of record by Dagmar Dolby as the Trustee of the Dagmar Dolby Trust under the Dolby Family Trust instrument, dated May 7, 1999 (the "Dagmar Dolby Trust"), voting power of which is shared by the Trustee and David E. Dolby as Special Trustee of the Dagmar Dolby Trust. This report is filed jointly by Dagmar Dolby and the Dagmar Dolby Trust with respect to the securities held and transactions effected by the Dagmar Dolby Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Effective February 5, 2026, the Reporting Person transferred this option to a revocable trust for no consideration, for estate planning purposes. This transfer is exempt from Section 16(b) by virtue of Rule 16b-5.

This option was granted for a total of 145,252 shares of Class A Common Stock. 1/4 of the total number of shares issuable under the option vests on the first anniversary of December 15, 2025, the vesting commencement date, and the balance of the shares in equal monthly installments over the next 36 months thereafter.

Effective February 5, 2026, the Reporting Person transferred this option to a revocable trust for no consideration, for estate planning purposes. This transfer is exempt from Section 16(b) by virtue of Rule 16b-5.

This option was granted for a total of 145,252 shares of Class A Common Stock. 1/4 of the total number of shares issuable under the option vests on the first anniversary of December 15, 2025, the vesting commencement date, and the balance of the shares in equal monthly installments over the next 36 months thereafter.

By the Kevin and Rachel Yeaman Family Trust dated May 14, 2009

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Award represents a total of 3,908 restricted stock units granted under the terms of the Issuer's 2020 Stock Plan. Each unit represents a contingent right to receive one share of the Issuer's Class A Common Stock upon vesting, which will occur on the earlier of (i) the first anniversary of the date of grant or (ii) the date immediately preceding the date of Issuer's 2027 annual meeting of stockholders, provided that, in either case, the Reporting Person continues to serve as a member of the Issuer's board of directors on such date.

Shares held following the reported transactions include 3,908 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

Shares held following the reported transaction includes 55,114 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold in multiple transactions at prices ranging from $66.49 to $67.48, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 28, 2025.

By the Kevin and Rachel Yeaman Family Trust dated May 14, 2009

The shares were sold in multiple transactions at prices ranging from $66.52 to $67.51, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 28, 2025.

Shares held following the reported transactions include 53,636 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

By the Kevin and Rachel Yeaman Family Trust dated May 14, 2009

In accordance with Rule 16b-3, shares reported as disposed of were withheld by the Issuer in a transaction exempt from Section 16(b) and not issued to the reporting person in order to cover withholding taxes incidental to the vesting of restricted stock units or performance-based restricted stock units.

Shares held following the reported transactions include 53,636 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

In accordance with Rule 16b-3, shares reported as disposed of were withheld by the Issuer in a transaction exempt from Section 16(b) and not issued to the reporting person in order to cover withholding taxes incidental to the vesting of restricted stock units.

Shares held following the reported transactions include 19,303 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

In accordance with Rule 16b-3, shares reported as disposed of were withheld by the Issuer in a transaction exempt from Section 16(b) and not issued to the reporting person in order to cover withholding taxes incidental to the vesting of restricted stock units or performance-based restricted stock units.

Shares held following the reported transaction (i) include 143,784 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest and (ii) exclude 6,751 shares which were issued to and are now held by the Kevin and Rachel Yeaman Family Trust dated May 14, 2009 in connection with the vesting of restricted stock units.

The shares were sold in multiple transactions at prices ranging from $65.98 to $66.975, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 28, 2025.

Includes 33,517 shares which were issued to and are now held by the Kevin and Rachel Yeaman Family Trust dated May 14, 2009 in connection with the reported transactions.

By the Kevin and Rachel Yeaman Family Trust dated May 14, 2009

In accordance with Rule 16b-3, shares reported as disposed of were withheld by the Issuer in a transaction exempt from Section 16(b) and not issued to the reporting person in order to cover withholding taxes incidental to the vesting of restricted stock units.

Shares held following the reported transactions include 59,172 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

In accordance with Rule 16b-3, shares reported as disposed of were withheld by the Issuer in a transaction exempt from Section 16(b) and not issued to the reporting person in order to cover withholding taxes incidental to the vesting of restricted stock units or performance-based restricted stock units.

Shares held following the reported transactions include 41,480 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.

The shares were sold in multiple transactions at prices ranging from $67.00 to $67.38, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected. The shares were sold pursuant to a 10b5-1 trading plan adopted on February 28, 2025.

Shares held following the reported transactions include 53,636 shares of Class A common stock underlying restricted stock units, which are subject to forfeiture until they vest.