Every organisation listed here can buy from you, and every link goes to their own official site. No aggregators, no middlemen, no paywalled databases, no signup. Pick the industry you sell into.
Car, truck and bus OEMs, Tier-1s, ADAS and autonomy, EV charging, batteries, two wheelers, fleets and transit.
295 doors → 🤖Humanoid builders, warehouse and industrial automation, field robotics, and the foundation model labs behind them.
104 doors → 🔌Fabs, foundries and OSAT, equipment and metrology, materials and gases, chip companies, EDA and electronics manufacturing.
215 doors → 🚆National railways, metro and RRTS authorities, rolling stock builders, signalling and the tender platforms they buy through.
84 doors → 🛸Drone and UAS makers, operators, eVTOL developers, counter-UAS and the regulators who certify them.
55 doors → 🏢The organisations that buy machines rather than build them: logistics, ports, airports, retail, mining, agriculture, defence, plus public tender boards and startup programmes.
149 doors →Doors marked as deep portals go straight to a supplier registration or tender system. The rest are official corporate doors, which is where a first conversation starts. We say which is which rather than padding the count.
Pick your industry above, then find the organisation you want to sell to. Every entry links straight to their own supplier registration page or tender portal, so you deal with them directly rather than through a reseller of contact data.
Registration is rarely the hard part. Most portals take under an hour. The hard part is what happens next, when your file sits alongside two hundred others and nobody inside the organisation knows your name.
A buyer door is a published route into an organisation that buys from suppliers like you: a supplier registration form, a vendor onboarding portal, a procurement page, or a live tender board. We list only doors that the organisation publishes itself.
We do not list aggregators, lead brokers or paywalled contact databases. Six industries are covered: automotive and mobility, robotics and physical AI, semiconductors and electronics, railway and metro, drones and air mobility, and cross-industry public tenders.
Yes. There is no signup, no email wall and no trial. The research already sits behind Ratha, and it is more useful shared than kept.
Almost every OEM runs a vendor portal. You create an account, submit company details, quality certifications such as IATF 16949, financials and capability documents, then wait for a category buyer to review you. Use the automotive and mobility list above to reach the right portal directly.
A supplier portal registers you as an approved vendor so you can be invited to quote later. A tender portal publishes specific open opportunities you can bid on now. Public bodies such as metros and transport undertakings mostly use tenders. Private manufacturers mostly use supplier registration.
Links are reviewed periodically and corrected when a programme moves or closes. If you find a broken door, tell us and we will fix it.
Rarely on its own. Registration puts your file in the system. It does not make the engineers and category buyers inside that organisation recognise your name, which is usually what decides who gets invited to quote.
Getting listed is step one. Being recognised is step two, and it is the step most technical suppliers skip. Ratha writes the LinkedIn content the buyers behind these doors actually read, tells you which of them engaged, and hands you a dossier naming the buying committee before the meeting.