How Portfilo works with evidence.

We prefer primary sources when they are available: official datasets, laws and regulations, company filings and records, peer-reviewed research, original datasets, direct interviews, official documentation, transcripts, and records created by the event being reported.

Independent reporting and research can provide corroboration, context, and facts that cannot be reconstructed from primary material. Market platforms, surveys, social posts, and community discussions can also be useful, but we examine what they can actually establish before relying on them.

A person or company saying something proves that they made the claim. It does not automatically prove that the underlying claim is true.

Consequential factual claims are checked against their underlying evidence. Before publication, we audit material numbers, dates, names, titles, quotations, company claims, legal or regulatory claims, and other assertions where an error could change the story.

We also look for evidence that challenges the emerging conclusion. Competing datasets, different methodologies, selection bias, weak causal reasoning, stale information, and financially interested sources can all change what a story should say.

If the evidence is incomplete, we qualify the claim, explain the limitation when it matters, continue reporting, or remove the claim. We do not turn missing evidence into false precision.