# NVIDIA became world's Largest company

*Economics. 92% certain. Wednesday, 30 September 2026*

> Speculative fiction assembled from prediction-market prices. This has not happened.

**Japan's central Bank lifted rates by 25 basis points and Zimbabwe's lithium ban cut supply by over 5,000 tonnes.**

On Wednesday 30 September, NVIDIA secured its position as the world's Largest company. The achievement came as Japan's central Bank lifted interest rates by 25 basis points on 18 September. Meanwhile, Zimbabwe's export ban on lithium, effective 29 September, cut global supply by more than 5,000 tonnes.

Its position was confirmed on 30 September. The ranking change occurred by the end of September.

The Bank of Japan raised its benchmark rate by 25 basis points on 18 September. The move contrasted with a possible larger 50-basis-point hike that had been considered. The modest increase signaled a gradual shift in the nation's monetary stance.

Zimbabwe announced an export ban on lithium that took effect on 29 September. The ban reduced global lithium supply by more than 5,000 tonnes. The reduction tightened the material's availability for batteries worldwide.

## Analysis

As the company overtook traditional tech giants, investors and competitors may reassess valuations across the semiconductor sector, while supply chains for AI chips gain heightened strategic importance.

By opting for a modest hike rather than a larger 50-basis-point step, the central Bank signals confidence in domestic demand while avoiding abrupt pressure on borrowers, a balance that could influence other central banks watching Japan's policy trajectory.

## What this was built from

- **Will the reduction in global lithium supply due to Zimbabwe export ban exceed 5 kt on September 29, 2026?**: Yes, 92%; settles Tuesday, 29 September 2026 (manifold). [Market](https://manifold.markets/CurtisSteele/will-the-reduction-in-global-lithiu-u0guq0qQz8)
- **Largest Company end of September?**: NVIDIA, 94%; settles Wednesday, 30 September 2026 (polymarket). [Market](https://polymarket.com/event/largest-company-end-of-september-1785358369147)
- **Bank of Japan Decision in September?**: 25 bps increase, 97%; settles Friday, 18 September 2026 (polymarket). [Market](https://polymarket.com/event/bank-of-japan-decision-in-september-20260616002734979)