# EDGAR Filing Document

**Accession Number:** 0001537372
**File Stem:** 0001193125-26-051828
**Filing Date:** 2026-2
**Character Count:** 54609
**Document Hash:** 45943aa260bcc824024bc08a8272bf9d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-051828.hdr.sgml**: 20260213

**ACCESSION NUMBER**: 0001193125-26-051828

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260213

**DATE AS OF CHANGE**: 20260213

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Dolby Laboratories, Inc.
- **CENTRAL INDEX KEY:** 0001308547
- **STANDARD INDUSTRIAL CLASSIFICATION:** PATENT OWNERS & LESSORS [6794]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 900199783
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0927

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-80595
- **FILM NUMBER:** 26634861

**BUSINESS ADDRESS:**
- **STREET 1:** 1275 MARKET STREET
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94103
- **BUSINESS PHONE:** 415 558 0200

**MAIL ADDRESS:**
- **STREET 1:** 1275 MARKET STREET
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94103
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Dolby Dagmar
- **CENTRAL INDEX KEY:** 0001537372

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** C/O DOLBY LABORATORIES, INC.
- **STREET 2:** 1275 MARKET STREET
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94103

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 55)**

**Dolby Laboratories, Inc.**

*(Name of Issuer)*

**Class A Common Stock**

*(Title of Class of Securities)*

**25659T107**

*(CUSIP Number)*

**Andy Sherman, Esq.**<br>1275 Market Street<br>San Francisco CA 94103-1410<br>(415) 558-0200

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**02/11/2026**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dagmar Dolby** | Name of reporting person<br>**Dagmar Dolby** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**31950904.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**34207733.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**160625.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**34368358.00** | Aggregate amount beneficially owned by each reporting person<br>**34368358.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**36.0%** | Percent of class represented by amount in Row (11)<br>**36.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Row 8 consist of (i) 57,125 shares of Class A Common Stock held of record by the Dagmar Dolby Fund, a California nonprofit public benefit corporation (the "Dagmar Dolby Fund"), (ii) 103,500 shares of Class A Common Stock held of record by the Ray Dolby Legacy Fund, a California nonprofit public benefit corporation (the "Ray Dolby Legacy Fund"), (iii) 24,108,162 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Marital Trust under the Dolby Family Trust Instrument dated May 7, 1999 (the "Marital Trust"), and (iv) 7,682,117 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument dated May 7, 1999 (the "Dagmar Dolby Trust"). Dagmar Dolby, as one of three directors of the Dagmar Dolby Fund, has shared voting power over all 57,125 shares of Class A Common Stock held of record by the Dagmar Dolby Fund, with voting and disposition decisions regarding such shares requiring the majority vote of the Dagmar Dolby Fund's board of directors. Dagmar Dolby, as one of three directors of the Ray Dolby Legacy Fund, has shared voting power over all 103,500 shares of Class A Common Stock held of record by the Ray Dolby Legacy Fund, with voting and disposition decisions regarding such shares requiring the majority vote of the Ray Dolby Legacy Fund's board of directors. David E. Dolby, Dagmar Dolby's son, is the Special Trustee of each of the Marital Trust and the Dagmar Dolby Trust. Dagmar Dolby has sole dispositive power over the shares held of record by each of the Marital Trust and the Dagmar Dolby Trust, and Dagmar Dolby and David E. Dolby have shared voting power over the shares held of record by each of the Marital Trust and the Dagmar Dolby Trust, with voting decisions requiring the unanimous vote of the Trustee and the Special Trustee. The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

The shares set forth in Row 9 consist of (i) 24,108,162 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Marital Trust, (ii) 7,682,117 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby Trust, (iii) 160,592 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A dated April 19, 2002 (the "Ray Dolby 2002 Trust A"), (iv) 463,262 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B dated April 19, 2002 (the "Ray Dolby 2002 Trust B"), (v) 1,040,000 shares of Class B Common Stock held of record by Dolby Holdings II LLC ("Dolby Holdings II"), (vi) 350,000 shares of Class B Common Stock held of record by Dolby Holdings III LLC ("Dolby Holdings III"), and (vii) 403,600 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B, dated March 23, 2016 (the "Dagmar Dolby 2016 Trust B"). Dagmar Dolby is the Trustee of, and has sole dispositive power over the shares held of record by, each of the Marital Trust, the Dagmar Dolby Trust, the Ray Dolby 2002 Trust A, the Ray Dolby 2002 Trust B, and the Dagmar Dolby 2016 Trust B. Dagmar Dolby and David E. Dolby, Special Trustee of the Marital Trust and the Dagmar Dolby Trust, have shared voting power over the shares held of record by each of the Marital Trust and the Dagmar Dolby Trust, with voting decisions requiring the unanimous vote of the Trustee and the Special Trustee. Thomas E. Dolby, Dagmar Dolby's son, is the Special Trustee of, and has sole voting power over the shares held of record by, the Ray Dolby 2002 Trust A. David E. Dolby is the Special Trustee of, and has sole voting power over the shares held of record by, each of the Ray Dolby 2002 Trust B, and the Dagmar Dolby 2016 Trust B. Dagmar Dolby has sole dispositive power over the shares held of record by Dolby Holdings II and Dolby Holdings III as the Manager of each, each of Thomas E. Dolby and David E. Dolby has sole voting power over 50% of the shares held of record by Dolby Holdings II as a Special Manager of Dolby Holdings II, and David E. Dolby has sole voting power over all of the shares held of record by Dolby Holdings III as a Special Manager of Dolby Holdings III. The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

The shares set forth in Row 10 consist of 57,125 shares of Class A Common Stock held of record by the Dagmar Dolby Fund. Dagmar Dolby, as one of three directors of the Dagmar Dolby Fund, has shared voting power over all 57,125 shares of Class A Common Stock held of record by the Dagmar Dolby Fund, with voting and disposition decisions regarding such shares requiring the majority vote of the Dagmar Dolby Fund's board of directors. The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

The shares set forth in Row 10 also consist of 103,500 shares of Class A Common Stock held of record by the Ray Dolby Legacy Fund. Dagmar Dolby, as one of three directors of the Ray Dolby Legacy Fund, has shared voting power over all 103,500 shares of Class A Common Stock held of record by the Ray Dolby Legacy Fund, with voting and disposition decisions regarding such shares requiring the majority vote of the Ray Dolby Legacy Fund's board of directors. The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by Dagmar Dolby is 36.1%. Dagmar Dolby's percentage ownership of Class B Common Stock is 98.7%.

The shares set forth in Row 11 represent 84.0% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock and the shares over which Dagmar Dolby has sole or shared voting power represent 78.1% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Marital Trust under the Dolby Family Trust Instrument dated May 7, 1999** | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Marital Trust under the Dolby Family Trust Instrument dated May 7, 1999** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**24108162.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**24108162.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**24108162.00** | Aggregate amount beneficially owned by each reporting person<br>**24108162.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**25.2%** | Percent of class represented by amount in Row (11)<br>**25.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 8, 9 and 11 consist of 24,108,162 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Marital Trust. David E. Dolby, Dagmar Dolby's son, is the Special Trustee of the Marital Trust. Dagmar Dolby has sole dispositive power over the shares held of record by the Marital Trust, and Dagmar Dolby and David E. Dolby have shared voting power over the shares held of record by the Marital Trust, with voting decisions requiring the unanimous vote of the Trustee and the Special Trustee.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by the Marital Trust is 28.4%. The Marital Trust's percentage ownership of Class B Common Stock is 69.6%.

The shares set forth in Row 11 represent 59.2% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument dated May 7, 1999** | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument dated May 7, 1999** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**7682117.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**7682117.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**7682117.00** | Aggregate amount beneficially owned by each reporting person<br>**7682117.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**8.0%** | Percent of class represented by amount in Row (11)<br>**8.0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 8, 9 and 11 consist of 7,682,117 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby Trust. David E. Dolby, Dagmar Dolby's son, is the Special Trustee of the Dagmar Dolby Trust. Dagmar Dolby has sole dispositive power over the shares held of record by the Dagmar Dolby Trust, and Dagmar Dolby and David E. Dolby have shared voting power over the shares held of record by the Dagmar Dolby Trust, with voting decisions requiring the unanimous vote of the Trustee and the Special Trustee.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by the Dagmar Dolby Trust is 11.2%. The Dagmar Dolby Trust's percentage ownership of Class B Common Stock is 22.2%.

The shares set forth in Row 11 represent 18.9% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A dated April 19, 2002** | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A dated April 19, 2002** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**160592.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**160592.00** | Aggregate amount beneficially owned by each reporting person<br>**160592.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.2%** | Percent of class represented by amount in Row (11)<br>**0.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 9 and 11 consist of 160,592 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A. Thomas E. Dolby, Dagmar Dolby's son, is the Special Trustee of the Ray Dolby 2002 Trust A. Dagmar Dolby has sole dispositive power over the shares held of record by the Ray Dolby 2002 Trust A, and Thomas E. Dolby has sole voting power over the shares held of record by the Ray Dolby 2002 Trust A.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by the Ray Dolby 2002 Trust A is 0.3%. The Ray Dolby 2002 Trust A's percentage ownership of Class B Common Stock is 0.5%.

The shares set forth in Row 11 represent 0.4% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B dated April 19, 2002** | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B dated April 19, 2002** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**463262.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**463262.00** | Aggregate amount beneficially owned by each reporting person<br>**463262.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.5%** | Percent of class represented by amount in Row (11)<br>**0.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 9 and 11 consist of 463,262 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B. David E. Dolby, Dagmar Dolby's son, is the Special Trustee of the Ray Dolby 2002 Trust B. Dagmar Dolby has sole dispositive power over the shares held of record by the Ray Dolby 2002 Trust B, and David E. Dolby has sole voting power over the shares held of record by the Ray Dolby 2002 Trust B.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by the Ray Dolby 2002 Trust B is 0.8%. The Ray Dolby 2002 Trust B's percentage ownership of Class B Common Stock is 1.3%.

The shares set forth in Row 11 represent 1.1% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dolby Holdings II LLC** | Name of reporting person<br>**Dolby Holdings II LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1040000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1040000.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1040000.00** | Aggregate amount beneficially owned by each reporting person<br>**1040000.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**1.1%** | Percent of class represented by amount in Row (11)<br>**1.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 8, 10 and 11 consist of 1,040,000 shares of Class B Common Stock held of record by Dolby Holdings II. Dagmar Dolby has sole dispositive power over the shares held of record by Dolby Holdings II as the Manager of Dolby Holdings II. Each of Thomas E. Dolby and David E. Dolby, Dagmar Dolby's sons, has sole voting power over 50% of the shares held of record by Dolby Holdings II as a Special Manager of Dolby Holdings II.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by Dolby Holdings II is 1.7%. Dolby Holdings II's percentage ownership of Class B Common Stock is 3.0%.

The shares set forth in Row 11 represent 2.6% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dolby Holdings III LLC** | Name of reporting person<br>**Dolby Holdings III LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**DELAWARE** | Citizenship or place of organization<br>**DELAWARE** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**350000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**350000.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**350000.00** | Aggregate amount beneficially owned by each reporting person<br>**350000.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.4%** | Percent of class represented by amount in Row (11)<br>**0.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 8, 10 and 11 consist of 350,000 shares of Class B Common Stock held of record by Dolby Holdings III. Dagmar Dolby has sole dispositive power over the shares held of record by Dolby Holdings III as the Manager of Dolby Holdings III. David E. Dolby, Dagmar Dolby's son, has sole voting power over the shares held of record by Dolby Holdings III as the Special Manager of Dolby Holdings III.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by Dolby Holdings III is 0.6%. Dolby Holdings III's percentage ownership of Class B Common Stock is 1.0%.

The shares set forth in Row 11 represents 0.9% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B dated March 23, 2016** | Name of reporting person<br>**Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B dated March 23, 2016** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**403600.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**403600.00** | Aggregate amount beneficially owned by each reporting person<br>**403600.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.4%** | Percent of class represented by amount in Row (11)<br>**0.4%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 9 and 11 consist of 403,600 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B. David E. Dolby, Dagmar Dolby's son, is the Special Trustee of the Dagmar Dolby 2016 Trust B. Dagmar Dolby has sole dispositive power over the shares held of record by the Dagmar Dolby 2016 Trust B, and David E. Dolby has sole voting power over the shares held of record by the Dagmar Dolby 2016 Trust B.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by the Dagmar Dolby 2016 Trust B is 0.7%. The Dagmar Dolby 2016 Trust B's percentage ownership of Class B Common Stock is 1.2%.

The shares set forth in Row 11 represent 1.0% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Thomas E. Dolby** | Name of reporting person<br>**Thomas E. Dolby** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**650592.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**680592.00** | Aggregate amount beneficially owned by each reporting person<br>**680592.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0.7%** | Percent of class represented by amount in Row (11)<br>**0.7%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Rows 7 and 11 consist of (i) 160,592 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A, and (ii) 520,000 shares of Class B Common Stock held of record by Dolby Holdings II. Dagmar Dolby, Thomas E. Dolby's mother, is the Trustee of, and has sole dispositive power over the shares held of record by, the Ray Dolby 2002 Trust A. Thomas E. Dolby is the Special Trustee of, and has sole voting power over the shares held of record by, the Ray Dolby 2002 Trust A. Dagmar Dolby has sole dispositive power over the shares held of record by Dolby Holdings II as the Manager of Dolby Holdings II, and Thomas E. Dolby has sole voting power over 50% of the 1,040,000 shares of Class B Common Stock held of record by Dolby Holdings II as a Special Manager of Dolby Holdings II. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by Thomas E. Dolby is 1.1%. Thomas E. Dolby's percentage ownership of Class B Common Stock is 2.0%.

The shares set forth in Row 11 represent 1.7% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

| **CUSIP No.** | **25659T107** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**David E. Dolby** | Name of reporting person<br>**David E. Dolby** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**1825672.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**31790279.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**88810.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**33615951.00** | Aggregate amount beneficially owned by each reporting person<br>**33615951.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**35.2%** | Percent of class represented by amount in Row (11)<br>**35.2%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** The rights of the holders of Class A Common Stock and Class B Common Stock are identical, except with respect to conversion rights and voting rights. Each share of Class B Common Stock is convertible into one share of Class A Common Stock, at no cost, at any time at the option of the holder, upon the affirmative vote of the holders of a majority of the shares of Class B Common Stock, or upon certain transfers. Each share of Class B Common Stock is entitled to ten votes per share, whereas each share of Class A Common Stock is entitled to one vote per share.

The shares set forth in Row 7 consist of (i) 88,810 shares of Class A Common Stock held of record by David E. Dolby, (ii) 463,262 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B, (iii) 520,000 shares of Class B Common Stock held of record by Dolby Holdings II, (iv) 350,000 shares of Class B Common Stock held of record by Dolby Holdings III, and (v) 403,600 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B. Dagmar Dolby, David E. Dolby's mother, is the Trustee of, and has sole dispositive power over the shares held of record by, each of the Ray Dolby 2002 Trust B and the Dagmar Dolby 2016 Trust B. David E. Dolby is the Special Trustee of, and has sole voting power over the shares held of record by, each of the Ray Dolby 2002 Trust B and the Dagmar Dolby 2016 Trust B. Dagmar Dolby has sole dispositive power over the shares held of record by Dolby Holdings II and Dolby Holdings III as the Manager of each, and David E. Dolby has sole voting power over 50% of the 1,040,000 shares of Class B Common Stock held of record by Dolby Holdings II and all of the 350,000 shares of Class B Common Stock held of record by Dolby Holdings III, as Special Manager of each. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

The shares set forth in Row 8 consist of (i) 24,108,162 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Marital Trust and (ii) 7,682,117 shares of Class B Common Stock held of record by Dagmar Dolby, as Trustee of the Dagmar Dolby Trust. David E. Dolby is the Special Trustee of each of the Marital Trust and the Dagmar Dolby Trust. Dagmar Dolby has sole dispositive power over the shares held of record by each of the Marital Trust and the Dagmar Dolby Trust, and Dagmar Dolby and David E. Dolby have shared voting power over the shares held of record by each of the Marital Trust and the Dagmar Dolby Trust, with voting decisions requiring the unanimous vote of the Trustee and the Special Trustee. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.

The shares set forth in Row 9 consist of 88,810 shares of Class A Common Stock held of record by David E. Dolby.

The percentage set forth in Row 13 represents the percentage ownership of Class A Common Stock assuming the conversion of all outstanding shares of Class B Common Stock into shares of Class A Common Stock. The percentage ownership of Class A Common Stock assuming the conversion of only the outstanding shares of Class B Common Stock beneficially owned by David E. Dolby is 35.6%. David E. Dolby's percentage ownership of Class B Common Stock is 96.7%.

The shares set forth in Row 11 represent 82.3% of the total outstanding voting power of the Class A Common Stock and Class B Common Stock.

The percentage set forth in Row 13 is based on 60,884,768 shares of Class A Common Stock and 34,655,045 shares of Class B Common Stock outstanding on January 23, 2026.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Class A Common Stock

**(b) Name of Issuer:**
Dolby Laboratories, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
1275 Market Street, San Francisco, CA, 94103-1410

This Amendment No. 55 to Schedule 13D (this "Amendment") amends the Schedule 13D initially filed with the Commission on December 27, 2011 (as subsequently amended prior to the date hereof, the "Statement"). This Amendment is filed on behalf of (i) Dagmar Dolby, (ii) Thomas E. Dolby, (iii) David E. Dolby, (iv) Dagmar Dolby, as Trustee of the Marital Trust, (v) Dagmar Dolby, as Trustee of the Dagmar Dolby Trust, (vi) Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A, (vii) Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B, (viii) Dolby Holdings II, (ix) Dolby Holdings III, and (x) Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B (collectively, the "Reporting Persons"), relating to the beneficial ownership of the Class A Common Stock, $0.001 par value per share (the "Class A Common Stock"), and the Class B Common Stock, $0.001 par value per share (the "Class B Common Stock"), of Dolby Laboratories, Inc., a Delaware corporation (the "Company").

This Amendment No. 55 is being filed to report the current percentage of the outstanding shares of Class A Common Stock (calculated in accordance with Rule 13d-3 under the Exchange Act) beneficially owned by the Reporting Persons, and reflects, as of February 11, 2026, a decrease of more than one percent of the outstanding shares of Class A Common Stock that the Reporting Persons beneficially own, or may be deemed to beneficially own, as reported in the most recently filed Statement. Except as set forth herein, this Amendment does not supplement, restate or amend any of the information disclosed in the Statement. Capitalized terms used but not defined in this Amendment have the meanings ascribed to them in the Statement.

**Item 4. Purpose of Transaction**

Item 4 of the Statement is amended by adding the following at the end thereof:

There was a decrease in the Reporting Persons' beneficial holdings of more than one percent of the outstanding shares of Class A Common Stock resulting from the gifting of (i) 43,500 shares of Class A Common Stock beneficially owned by the Dagmar Dolby Fund and (ii) 890,000 shares of Class A Common Stock beneficially owned by the Dagmar Dolby Trust (collectively, the "Transfers"), partially offset by 3,140 shares of Class A Common Stock issued to David E. Dolby upon the vesting of restricted stock units. The Transfers were effected solely for charitable gifting purposes, and were transfers for no value without the payment or receipt of any funds or other consideration by the Reporting Persons in exchange therefor.

**Item 5. Interest in Securities of the Issuer**

**(a)**
—

**(b)**
—

**(c)**
Subsection (c) of Item 5 of the Statement is amended by adding the following at the end thereof:

The information set forth in Item 4 regarding the Transfers is incorporated herein by reference.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dagmar Dolby

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dagmar Dolby, as Trustee of the Marital Trust under the Dolby Family Trust Instrument dated May 7, 1999

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Trustee

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dagmar Dolby, as Trustee of the Dagmar Dolby Trust under the Dolby Family Trust Instrument dated May 7, 1999

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Trustee

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust A dated April 19, 2002

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Trustee

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dagmar Dolby, as Trustee of the Ray Dolby 2002 Trust B dated April 19, 2002

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Trustee

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dolby Holdings II LLC

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Manager

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dolby Holdings III LLC

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Manager

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Dagmar Dolby, as Trustee of the Dagmar Dolby 2016 Trust B dated March 23, 2016

**Signature:** /s/ Patrick McCabe

**Name/Title:** Dagmar Dolby, Trustee

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Thomas E. Dolby

**Signature:** /s/ Patrick McCabe

**Name/Title:** Thomas E. Dolby

**Date:** 02/13/2026

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** David E. Dolby

**Signature:** /s/ Patrick McCabe

**Name/Title:** David E. Dolby

**Date:** 02/13/2026