Exited position

Warren Buffett’s International Business Machs (IBM) position

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

Berkshire HathawayVerified through Q2 2026
Relationship snapshot

At a glance

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

First reportedQ1 2011Earliest verified positive filing snapshot
Latest statusExited positionBased on the latest supported relationship state
Peak shares81.23MHighest verified quarter-end share count
Quarters reported27Verified quarters with shares above zero
What happened?

Berkshire Hathaway first reported International Business Machs in Q1 2011. The reported position was increased and reduced across later filings. The latest verified relationship event shows that Berkshire Hathaway sold the entire position in Q1 2018, and the stock is no longer reported in the latest verified portfolio.

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.

Q1 2018
Sold the entire position−2.05M shares · No shares reported at quarter-end
Q4 2017
Sold 94.5% of the position−34.98M shares · 2.05M shares remained
Filing context

Quarter-end price $153.42 · Estimated holding basis $174.89

Q3 2017
Sold 31.5% of the position−17.06M shares · 37.03M shares remained
Filing context

Quarter-end price $145.08 · Estimated holding basis $174.89

Q2 2017
Sold 16.2% of the position−10.48M shares · 54.08M shares remained
Filing context

Quarter-end price $153.83 · Estimated holding basis $174.89

Q1 2017
Sold 20.5% of the position−16.67M shares · 64.56M shares remained
Filing context

Quarter-end price $174.14 · Estimated holding basis $174.89

Q1 2016
Bought 0.2% more+198.85K shares · 81.23M shares reported after the change
Filing context

Quarter-end price $151.45 · Estimated holding basis $174.89

8 unchanged quarters are collapsed by default.

Portfolio importance

How important was International Business Machs in Berkshire Hathaway’s reported portfolio?

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

Last reported portfolio weight0.2%Q4 2017
Last reported rank#36of 48 reported positions
Peak portfolio weight18.6%Q3 2012
Best historical rank#2Q3 2011
At peak importanceQ3 2012
IBM
18.6%
Largest holding
20.1%
Cross-investor discovery

Who else owns International Business Machs?

Also reported by 1 other tracked investor in their latest verified filings.

Joel GreenblattGotham Asset Management
IBM0.0% of reported portfolio
Explore International Business Machs across all tracked investors →
MarketInsiderLab research

Connected research on International Business Machs

Only published MIL research mapped to the exact stock identity is shown here.

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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$237.752026-09-17

Market context only; not an investor transaction price.

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

This tracker follows Berkshire Hathaway’s Form 13F disclosures. It is not Warren Buffett’s personal brokerage account, and 13F filings do not reveal exact trade dates or execution prices.