Current position

Tom Russo’s Berkshire Hathaway Inc Del (BRK/B) position

Reported position history, portfolio importance and verified filing changes from public SEC disclosures.

Gardner Russo & Quinn · formerly Gardner Russo & GardnerVerified through Q2 2026
Relationship snapshot

At a glance

The full verified relationship, including prior ownership episodes and exits where supported.

First reportedQ4 2010Earliest verified positive filing snapshot
Latest statusCurrent positionBased on the latest supported relationship state
Peak shares2.59MHighest verified quarter-end share count
Quarters reported61Verified quarters with shares above zero
What happened?

Gardner Russo & Quinn · formerly Gardner Russo & Gardner first reported Berkshire Hathaway Inc Del in Q4 2010. The reported position was increased and reduced across later filings. Gardner Russo & Quinn · formerly Gardner Russo & Gardner currently reports 1.08M shares. The latest verified filing showed: Sold 2.8% of the position.

Verified SEC history

Position over time

See the same verified relationship through reported shares, portfolio weight or reported value.

Metric

Gaps indicate periods that cannot be safely connected or where a verified corporate action changes the raw share scale. Stock price, when available, is market context and not a transaction price.

Key filing events

What changed

Latest filing plus the most meaningful reported changes. Unchanged quarters are collapsed by default.

Q2 2026
Sold 2.8% of the position−31.07K shares · 1.08M shares remained
Filing context

Quarter-end price $500.39 · Estimated holding basis $227.63

Q1 2026
Sold 1.3% of the position−14.97K shares · 1.11M shares remained
Filing context

Quarter-end price $479.20 · Estimated holding basis $227.63

Q4 2025
Sold 3.1% of the position−36.00K shares · 1.13M shares remained
Filing context

Quarter-end price $502.65 · Estimated holding basis $227.63

Q3 2025
Bought 0.6% more+6.83K shares · 1.16M shares reported after the change
Filing context

Quarter-end price $502.74 · Estimated holding basis $227.63

Q2 2025
Sold 2.2% of the position−26.04K shares · 1.15M shares remained
Filing context

Quarter-end price $485.77 · Estimated holding basis $226.01

Q1 2025
Sold 8.3% of the position−106.31K shares · 1.18M shares remained
Filing context

Quarter-end price $532.58 · Estimated holding basis $226.01

Portfolio importance

How important is Berkshire Hathaway Inc Del in Gardner Russo & Quinn · formerly Gardner Russo & Gardner’s reported portfolio?

Relative importance is measured only within the verified primary non-option reported portfolio for each quarter.

Current portfolio weight6.1%Q2 2026
Current rank#8of 85 reported positions
Peak portfolio weight7.0%Q1 2025
Best historical rank#6Q4 2024
At peak importanceQ1 2025
BRK/B
7.0%
Largest holding
14.8%
Cross-investor discovery

Who else owns Berkshire Hathaway Inc Del?

Also reported by 7 other tracked investors in their latest verified filings.

Guy SpierAquamarine Capital
BRK/B33.9% of reported portfolio
Bill GatesGates Foundation Trust
BRK/B21.4% of reported portfolio
Christopher BloomstranSemper Augustus Investments Group LLC
BRK/B15.5% of reported portfolio
Explore Berkshire Hathaway Inc Del across all tracked investors →
SEC evidence & methodology

SEC filing evidence

Market context and filing-derived values are kept separate from actual transaction prices, which 13F filings do not disclose.

Latest verified stock price$509.772026-09-18

Market context only; not an investor transaction price.

Latest filing quarter-end price$500.39Q2 2026

Derived from validated reported value and shares where supported.

Estimated holding basis$227.63Historical reference — not actual purchase price

Calculated from supported filing history.

Latest verified investor filingQ2 2026 · filed 2026-08-13
Open SEC filing ↗

This tracker follows the current SEC filer, Gardner Russo & Quinn LLC (formerly Gardner Russo & Gardner), not Tom Russo’s personal brokerage account. Form 13F reports quarter-end U.S.-listed positions and certain options, but it does not reveal exact trade dates, execution prices, short positions or the purpose of an option position.