Dagmar Dolby - 28 Aug 2026 Form 4 Insider Report for Dolby Laboratories, Inc. (DLB)

Reporting relationship
10%+ Owner
Issuer ticker
DLB
Reported as of
28 Aug 2026
Net transaction value
$0
Source evidence Original filing metadata and source links for verification. 4 source fields
SEC form
4
Accepted by SEC
28 Aug 2026, 18:02:38 UTC
Prior SEC filing
27 Feb 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/ Daniel Rodriguez, Attorney-in-Fact

Key filing fact

Dagmar Dolby filed Form 4 for Dolby Laboratories, Inc. (DLB) on 28 Aug 2026.

Key facts

  • This page summarizes Dagmar Dolby's Form 4 filing for Dolby Laboratories, Inc. (DLB).
  • 6 reported transactions and 22 derivative rows are listed below.
  • Accepted by SEC: 28 Aug 2026, 18:02.

Change

  • Previous filing in this sequence was filed on 27 Feb 2026.
  • Current net transaction value: $0.

Research use

  • This tells you what this filing adds before you inspect full transaction and derivative tables.
  • You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (2)

CIK 0001537372 Primary reporting owner

Dolby Dagmar

Relationship
10%+ Owner
Address
C/O DOLBY LABORATORIES, INC., 1275 MARKET STREET, SAN FRANCISCO
Signature
/s/ Daniel Rodriguez, Attorney-in-Fact
Signature date
28 Aug 2026
CIK 0001598813

DAGMAR DOLBY TRUST UNDER DOLBY FAMILY TRUST INSTRUMENT DATED MAY 7, 1999

Relationship
10%+ Owner
Address
C/O DOLBY LABORATORIES, INC., 1275 MARKET STREET, SAN FRANCISCO
Signature
/s/ Daniel Rodriguez, Attorney-in-Fact
Signature date
28 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

DLB transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares
+300,000
Change %
Price
$0.000000*
Shares after
300,000
Date
28 Aug 2026
Ownership
By Trust
Footnotes
F1, F2, F3
DLB transaction

Class A Common Stock

Conversion of derivative security

Transaction value
Shares
+300,000
Change %
Price
$0.000000*
Shares after
300,000
Date
28 Aug 2026
Ownership
By Trust
Footnotes
F1, F2, F3
DLB transaction

Class A Common Stock

Gift

Transaction value
Shares
-300,000
Change %
-100%
Price
$0.000000*
Shares after
0
Date
28 Aug 2026
Ownership
By Trust
Footnotes
F2, F3
DLB transaction

Class A Common Stock

Gift

Transaction value
Shares
-300,000
Change %
-100%
Price
$0.000000*
Shares after
0
Date
28 Aug 2026
Ownership
By Trust
Footnotes
F2, F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

DLB transaction Derivative

Class B Common Stock

Gift

Transaction value
Shares
-2,000,000
Change %
-30%
Price
$0.000000*
Shares after
4,672,117
Date
28 Aug 2026
Ownership
By a trust
Underlying class
Class A Common Stock
Underlying amount
2,000,000
Exercise price
Footnotes
F3, F4, F5
DLB transaction Derivative

Class B Common Stock

Gift

Transaction value
Shares
-2,000,000
Change %
-30%
Price
$0.000000*
Shares after
4,672,117
Date
28 Aug 2026
Ownership
By a trust
Underlying class
Class A Common Stock
Underlying amount
2,000,000
Exercise price
Footnotes
F3, F4, F5
DLB transaction Derivative

Class B Common Stock

Gift

Transaction value
Shares
+1,000,000
Change %
Price
$0.000000*
Shares after
1,000,000
Date
28 Aug 2026
Ownership
By a trust
Underlying class
Class A Common Stock
Underlying amount
1,000,000
Exercise price
Footnotes
F4, F5, F6
DLB transaction Derivative

Class B Common Stock

Gift

Transaction value
Shares
+1,000,000
Change %
Price
$0.000000*
Shares after
1,000,000
Date
28 Aug 2026
Ownership
By a trust
Underlying class
Class A Common Stock
Underlying amount
1,000,000
Exercise price
Footnotes
F4, F5, F6
DLB transaction Derivative

Class B Common Stock

Gift

Transaction value
Shares
+1,000,000
Change %
Price
$0.000000*
Shares after
1,000,000
Date
28 Aug 2026
Ownership
By a trust
Underlying class
Class A Common Stock
Underlying amount
1,000,000
Exercise price
Footnotes
F4, F5, F7
DLB transaction Derivative

Class B Common Stock

Gift

Transaction value
Shares
+1,000,000
Change %
Price
$0.000000*
Shares after
1,000,000
Date
28 Aug 2026
Ownership
By a trust
Underlying class
Class A Common Stock
Underlying amount
1,000,000
Exercise price
Footnotes
F4, F5, F7
DLB transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares
-300,000
Change %
-6.4%
Price
$0.000000*
Shares after
4,372,117
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
300,000
Exercise price
Footnotes
F2, F3, F4
DLB transaction Derivative

Class B Common Stock

Conversion of derivative security

Transaction value
Shares
-300,000
Change %
-6.4%
Price
$0.000000*
Shares after
4,372,117
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
300,000
Exercise price
Footnotes
F2, F3, F4
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
160,592
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F8
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
160,592
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F8
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
463,262
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F9
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
463,262
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F9
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
403,600
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F10
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
403,600
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F10
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
24,108,162
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F11
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
24,108,162
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F11
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,040,000
Date
28 Aug 2026
Ownership
By LLC
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F12
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,040,000
Date
28 Aug 2026
Ownership
By LLC
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F12
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
350,000
Date
28 Aug 2026
Ownership
By LLC
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F13
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
350,000
Date
28 Aug 2026
Ownership
By LLC
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F13
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,000,000
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F14
DLB holding Derivative

Class B Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
1,000,000
Date
28 Aug 2026
Ownership
By Trust
Underlying class
Class A Common Stock
Underlying amount
Exercise price
Footnotes
F4, F14
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 14 footnotes

Footnote F1

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.

Footnote F2

On August 28, 2026, the Dagmar Dolby Trust (as defined below) converted 300,000 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 Securities Exchange Act of 1934, as amended (the "Act").

Footnote F3

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.

Footnote F4

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.

Footnote F5

On August 28, 2026, the Dagmar Dolby Trust contributed a total of 2,000,000 shares of Class B Common Stock: 1,000,000 to a newly formed grantor retained annuity trust, the Dagmar Dolby 2026 Trust AA-2 (as defined below) and 1,000,000 to a newly formed grantor retained annuity trust, the Dagmar Dolby 2026 Trust BB (as defined below). Such share contributions were effected solely for tax and estate planning purposes, and were each a transfer for no value without the payment or receipt of any funds or other consideration by any reporting person in exchange therefor. As such a change in form of indirect beneficial ownership only, applicable rules consider each 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.

Footnote F6

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-2, dated August 25, 2026 (the "Dagmar Dolby 2026 Trust AA-2"), voting power over which is held by David E. Dolby as Special Trustee of the Dagmar Dolby 2026 Trust AA-2. This report is filed by Dagmar Dolby with respect to the securities held by the Dagmar Dolby 2026 Trust AA-2. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F7

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 BB, dated August 25, 2026 (the "Dagmar Dolby 2026 Trust BB"), voting power over which is held by David E. Dolby as Special Trustee of the Dagmar Dolby 2026 Trust BB. This report is filed by Dagmar Dolby with respect to the securities held by the Dagmar Dolby 2026 Trust BB. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F8

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 Ray Dolby 2002 Trust A, dated April 19, 2002 (the "Ray Dolby 2002 Trust A"), voting power of which is held by Thomas E. Dolby, son of Dagmar Dolby, as Special Trustee of the Ray Dolby 2002 Trust A. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F9

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 Ray Dolby 2002 Trust B, dated April 19, 2002 (the "Ray Dolby 2002 Trust B"), voting power of which is held by David E. Dolby, as Special Trustee of the Ray Dolby 2002 Trust B. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F10

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 2016 Trust B, dated March 23, 2016 (the "Dagmar Dolby 2016 Trust B"), voting power of which is held by David E. Dolby as Special Trustee of the Dagmar Dolby 2016 Trust B. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F11

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 Marital Trust under the Dolby Family Trust instrument, dated May 7, 1999 (the "Marital Trust"), voting power of which is shared by the Trustee and David E. Dolby as Special Trustee of the Marital Trust. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F12

Reflects shares of Class B Common Stock (convertible into a like number of shares of Class A Common Stock) held of record by Dolby Holdings II LLC, a limited liability company ("Dolby Holdings II"), investment power over which is held by Dagmar Dolby, manager of Dolby Holdings II, and voting power over which is held by (i) Thomas E. Dolby, a Special Manager of Dolby Holdings II, with respect to 50% of such shares, and (ii) David E. Dolby, a Special Manager of Dolby Holdings II, with respect to 50% of such shares. This report is filed by Dagmar Dolby with respect to the securities held by Dolby Holdings II. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein

Footnote F13

Reflects shares of Class B Common Stock (convertible into a like number of shares of Class A Common Stock) held of record by Dolby Holdings III LLC, a limited liability company ("Dolby Holdings III"), investment power over which is held by Dagmar Dolby, the manager of Dolby Holdings III, and voting power over which is held by David E. Dolby, the Special Manager of Dolby Holdings III. This report is filed by Dagmar Dolby with respect to the securities held by Dolby Holdings III. The reporting person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein.

Footnote F14

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.

We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .