GARDNER RUSSO & QUINN LLC: BRK-B position timeline

GARDNER RUSSO & QUINN LLC held 1,079,364 BRK-B shares at 2026-06-30 per its 13F-HR filed 2026-08-13.

the latest 13F is the newest step

1. period ended2026-06-30

   13F 1,079,364 shares

   Change vs previous 13F -31,065 shares

   6.05% of the 13F portfolio, value $540,102,952.

   13F-HR 0000860643-26-000005 filed by GARDNER RUSSO & QUINN LLC
   Filed 2026-08-13 (acceptance time not in the bulk data set), ingested 2026-10-06 09:57:27 UTC

   Acceptance time not in the bulk data set (spec §4.2).

2. period ended2026-03-31

   13F 1,110,429 shares

   Change vs previous 13F -14,966 shares

   6.26% of the 13F portfolio, value $532,117,577.

   13F-HR 0000860643-26-000003 filed by GARDNER RUSSO & QUINN LLC
   Filed 2026-05-13 (acceptance time not in the bulk data set), ingested 2026-10-06 09:58:43 UTC

   Acceptance time not in the bulk data set (spec §4.2).

3. period ended2025-12-31

   13F 1,125,395 shares

   Change vs previous 13F -35,999 shares

   6.11% of the 13F portfolio, value $565,679,797.

   13F-HR 0000860643-26-000001 filed by GARDNER RUSSO & QUINN LLC
   Filed 2026-02-12 (acceptance time not in the bulk data set), ingested 2026-10-07 03:01:36 UTC

   Acceptance time not in the bulk data set (spec §4.2).

4. period ended2025-09-30

   13F 1,161,394 shares

   Change vs previous 13F +6,828 shares

   6.26% of the 13F portfolio, value $583,879,220.

   13F-HR 0000860643-25-000007 filed by GARDNER RUSSO & QUINN LLC
   Filed 2025-11-12 (acceptance time not in the bulk data set), ingested 2026-10-07 03:02:25 UTC

   Acceptance time not in the bulk data set (spec §4.2).

5. period ended2025-06-30

   13F 1,154,566 shares

   Change vs previous 13F -26,042 shares

   5.96% of the 13F portfolio, value $560,853,526.

   13F-HR 0000860643-25-000004 filed by GARDNER RUSSO & QUINN LLC
   Filed 2025-08-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:23:11 UTC

   Acceptance time not in the bulk data set (spec §4.2).

6. period ended2025-03-31

   13F 1,180,608 shares

   Change vs previous 13F -106,313 shares

   7.05% of the 13F portfolio, value $628,768,209.

   13F-HR 0000860643-25-000003 filed by GARDNER RUSSO & QUINN LLC
   Filed 2025-05-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:06 UTC

   Acceptance time not in the bulk data set (spec §4.2).

7. period ended2024-12-31

   13F 1,286,921 shares

   Change vs previous 13F -55,983 shares

   6.59% of the 13F portfolio, value $583,335,551.

   13F-HR 0000860643-25-000001 filed by GARDNER RUSSO & QUINN LLC
   Filed 2025-02-12 (acceptance time not in the bulk data set), ingested 2026-10-07 18:25:55 UTC

   Acceptance time not in the bulk data set (spec §4.2).

8. period ended2024-09-30

   13F 1,342,904 shares

   Change vs previous 13F not available

   6.35% of the 13F portfolio, value $618,084,995.

   13F-HR 0000860643-24-000007 filed by GARDNER RUSSO & QUINN LLC
   Filed 2024-11-13 (acceptance time not in the bulk data set), ingested 2026-10-07 18:26:56 UTC

   Acceptance time not in the bulk data set (spec §4.2).