Current position

Christopher Bloomstran’s Berkshire Hathaway Inc Del (BRK/B) position

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

Semper Augustus Investments Group LLCVerified through Q2 2026
Relationship snapshot

At a glance

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

First reportedQ1 2010Earliest verified positive filing snapshot
Latest statusCurrent positionBased on the latest supported relationship state
Peak shares347.78KHighest verified quarter-end share count
Quarters reported65Verified quarters with shares above zero
What happened?

Semper Augustus Investments Group LLC first reported Berkshire Hathaway Inc Del in Q1 2010. The reported position was increased and reduced across later filings. Semper Augustus Investments Group LLC currently reports 273.15K shares. The latest verified filing showed: Bought 8.0% more.

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
Bought 8.0% more+20.12K shares · 273.15K shares reported after the change
Filing context

Quarter-end price $500.39 · Estimated holding basis $186.94

Q1 2026
Bought 1.5% more+3.81K shares · 253.03K shares reported after the change
Filing context

Quarter-end price $479.20 · Estimated holding basis $162.02

Q4 2025
Sold 0.4% of the position−1.03K shares · 249.21K shares remained
Filing context

Quarter-end price $502.65 · Estimated holding basis $157.16

Q3 2025
Bought 1.4% more+3.58K shares · 250.24K shares reported after the change
Filing context

Quarter-end price $502.74 · Estimated holding basis $157.16

Q2 2025
Bought 3.1% more+7.32K shares · 246.66K shares reported after the change
Filing context

Quarter-end price $485.77 · Estimated holding basis $152.15

Q1 2025
Bought 0.5% more+1.30K shares · 239.35K shares reported after the change
Filing context

Quarter-end price $532.58 · Estimated holding basis $141.96

3 unchanged quarters are collapsed by default.

Portfolio importance

How important is Berkshire Hathaway Inc Del in Semper Augustus Investments Group LLC’s reported portfolio?

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

Current portfolio weight15.5%Q2 2026
Current rank#1of 50 reported positions
Peak portfolio weight26.5%Q4 2017
Best historical rank#1Q1 2010
At peak importanceQ4 2017
BRK/B
26.5%
Largest holding
26.5%
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
Li LuHimalaya Capital Management
BRK/B15.0% 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$186.94Historical reference — not actual purchase price

Calculated from supported filing history.

Latest verified investor filingQ2 2026 · filed 2026-08-14
Open SEC filing ↗

This tracker follows Semper Augustus Investments Group LLC’s Form 13F disclosures, not Christopher Bloomstran’s personal brokerage account. Form 13F reports quarter-end positions later and does not reveal exact trade dates or execution prices.