Trading network Who trades the same niche stocks?

One member buying a widely-held stock is noise. But when the same small group keeps turning up in the same niche stocks — names only a handful of people in Congress trade — that recurring overlap is a pattern worth seeing. Each member is a node; a line joins two who share niche tickers (traded by 12 members or fewer). The lines that matter most are gold: those join a Democrat and a Republican who keep buying the same obscure names.

Co-activity, not collusion. Shared trading in the same stocks has many innocent explanations — the same news, the same advisor, the same widely-recommended idea, or coincidence. This graph makes no claim that linked members coordinate or communicate; it only shows where the overlap is unusually concentrated, so the question can be asked in the open. A planned future version may add shared committees and campaign-finance ties. See also consensus clusters and the Leakage Index.