In simple terms: One unnamed corporate action was large enough to dominate an unusually strong workout year. The 1963 'sensational' workout is included in the Buffett Partnership special-situations record with an evidence grade of A- - directly quantified, but anonymous.

What Buffett saw

Buffett later reported a 30.6% workout-category result for 1963 and warned that one sensational situation had a disproportionate effect. He did not name it.

The context is striking: the disclosed workout-category figures were 14.6% in 1962, 30.6% in 1963 and 10.3% in 1964. Buffett himself told partners not to extrapolate the middle number because one exceptional event had done so much of the work.

How the situation was meant to work

A single closing, tax ruling or tender can produce a large dollar gain when a position is concentrated. That is why the category can look stable only after many years and many independent outcomes, not after one headline annual return.

Texas National Petroleum overlaps the period, but Buffett presented it as a routine work-out. The source record does not justify equating the named TNP position with the anonymous exceptional winner.

The timeline, capital and risk

Capital disclosed: Not disclosed.

Time frame: 1963.

The trap is narrative completion. Neither the company, the capital committed, the deal terms nor the individual gain is given, so attaching this label to Texas National Petroleum or another famous name would make the history sound clearer than it is.

What happened

Outcome: It heavily influenced the category result, but Buffett did not identify the company or transaction.

What the return means - and the lasting lesson

Return record: The workout category earned 30.6%; the individual return is undisclosed.

Annual category results can be dominated by one outcome. A credible post-mortem preserves the missing identity rather than selecting a famous security to fill the gap.

This guide is educational information, not a recommendation, investment advice or a substitute for reading the underlying disclosure.