One company, more than one room

A dual listing, in classroom words, is one company whose shares sit on more than one venue. Two books. Two lasts. Sometimes two tickers and two currencies. The firm is still one residual claim — one set of accounts — with extra plumbing.

This is old. A 1927 dual-listed industrial or mining house in two European books is the usual classroom picture: one firm, two rooms, two last prints. Royal Dutch and Shell Transport sat in two rooms for decades after their 1907 combination. Unilever’s Dutch and UK twins sat that way from 1930. Nominative: those marks stay with those firms. We do not unify a share for you.

Why do it: a home crowd, a second currency book, a rule that used to require a local listing, a merger that left two legal wrappers. Reasons are history. History is not a reason this desk sizes both tickers as a pair trade.

Human: if last in London and last in Amsterdam disagree for a minute, that is two books, two clocks, two FX prints. It is not a free lunch we will write. Arbitrage is a shop with capital and a lawyer. We are a classroom.