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# Nikkei jumps 2% as Advantest rises 7.8% on Anthropic IPO filing
- URL: https://bullquill.com/nikkei-jumps-2-percent-anthropic-ipo-chip-rally/
- Published: 2026-10-27T01:13:09.000Z
- Updated: 2026-10-27T01:27:48.000Z
- Description: Advantest rose 7.8% and SoftBank Group 4.8% in early trade, snapping a three-session losing streak that had left the index at its lowest close since July 30.
- Author: Rowan Ashby
- Tags: Markets, Breaking, Trending, Nikkei 225, Japan, Anthropic, Advantest, SoftBank Group, #lang-en, #tr-nikkei-jumps-2-percent-anthropic-ipo-chip-rally

## Key takeaways

- Yahoo Finance data showed Japan's Nikkei 225 at 63,462.76 at 00:54 UTC on Tuesday, October 27, a gain of 2.05%, or about 1,273 points, from Monday's close of 62,189.65.
- CNBC and Trading Economics both linked the rebound to Wall Street's gains on Monday and to optimism over Anthropic's US IPO filing, which lifted AI and chip stocks.
- Chip-related shares led. Trading Economics reported Advantest up 7.8%, SoftBank Group up 4.8% and Tokyo Electron and Kioxia each up 3.3% in early trade.
- The rise snaps a three-session losing streak that had pushed the index to its lowest close since July 30\. No Japan-specific policy or company announcement has been reported as the trigger.

## What happened: why the Nikkei jumps on Tuesday

Japan's Nikkei jumps 2.05% to 63,462.76 in early Tuesday trade, erasing Monday's loss as Advantest and SoftBank Group rally after Anthropic's Nasdaq IPO filing lifted US tech stocks, according to CNBC and Trading Economics.

The index opened at 62,569.08, up 379.43 points, with the broader Topix up 14.33 points at 3,987.31, Fisco reported via Zaikei. Gains then widened. CNBC reported the Nikkei up 1.7% and the Topix up 0.4% shortly after the open, and Yahoo Finance data put the index 2.05% higher at 63,462.76 at 00:54 UTC (09:54 JST). Trading Economics described the benchmark as trading more than 2% higher, near 63,500.

The bigger gain in the Nikkei than in the Topix reflects how the rally was concentrated. The Nikkei 225 is price-weighted, so a handful of expensive chip and technology shares can move it far more than the broader, market-cap-weighted Topix. Bullquill's guide to the [difference between the Nikkei 225 and Topix](https://bullquill.com/nikkei-225-vs-topix-difference/) explains why the two can diverge on days like this.

| Measure                                   | Level     | Change      | Time / source                        |
| ----------------------------------------- | --------- | ----------- | ------------------------------------ |
| Nikkei 225, previous close (Oct 26)       | 62,189.65 | \-0.80%     | Close; Reuters via Business Recorder |
| Topix, previous close (Oct 26)            | 3,972.98  | +0.18%      | Close; Reuters via Business Recorder |
| Nikkei 225, open (Oct 27)                 | 62,569.08 | +379.43 pts | 00:00 UTC; Fisco via Zaikei          |
| Topix, open (Oct 27)                      | 3,987.31  | +14.33 pts  | 00:00 UTC; Fisco via Zaikei          |
| Nikkei 225, early trade                   | 63,462.76 | +2.05%      | 00:54 UTC; Yahoo Finance             |
| Nasdaq Composite (Oct 26 close)           | 26,169.38 | +0.82%      | Fisco via Zaikei                     |
| Philadelphia Semiconductor Index (Oct 26) | n/a       | +2.82%      | Fisco via Zaikei                     |

## What we know

- **Wall Street lead.** US stocks rose on Monday, with the Dow up 146.42 points, or 0.3%, the S&P 500 up 0.7% and the Nasdaq Composite up 0.8% as tech outperformed, CNBC reported. Fisco put the Philadelphia Semiconductor Index up 2.82%.
- **Anthropic's filing.** Anthropic PBC filed a Form S-1 registration statement with the US Securities and Exchange Commission on October 26 for a planned Nasdaq listing under the ticker "ANT", according to the SEC's EDGAR database. CNBC said the filing gave the AI trade a boost after weeks of worry that AI companies were borrowing too much to fund data-centre build-outs. Bullquill's earlier report covers the [Anthropic S-1 filing and ANT listing](https://bullquill.com/anthropic-files-s1-nasdaq-ipo-ant/).
- **Chip and AI shares.** Fisco listed Ibiden, SUMCO, Advantest, Kioxia Holdings, Kokusai Electric, SoftBank Group and Tokyo Electron among the actively traded gainers at the open, while drugmakers, property developers and trading houses lagged.
- **Oil.** Trading Economics said lower oil prices on renewed Middle East diplomacy also supported sentiment. Fisco noted crude eased after no attack on Iran was reported over the weekend, while prices stayed high overall.
- **Regional move.** The rally was not limited to Tokyo. South Korea's Kospi rose 3.8% in early trade, CNBC reported; Bullquill covered the [KOSPI's 3.7% jump](https://bullquill.com/kospi-jumps-3-percent-anthropic-ipo-oil/) separately.

## What we don't know yet

- Whether the gain holds into the close at 15:30 JST (06:30 UTC). Early gaps after a losing streak can fade, and the closing level has not been published.
- Exact individual stock moves differ slightly between data providers in early trade; the figures above are as reported by each source at the time.
- How much of the move is short-covering after three down days rather than fresh buying. No source has published investor-flow data for Tuesday's session yet.

## Background

Tokyo had been one of the hardest-hit markets in October's AI-related sell-off. The Nikkei [fell about 2% on October 23](https://bullquill.com/nikkei-falls-2-percent-ai-selloff-deepens/) after a 2.65% drop the day before, and on Monday it slid 0.80% to 62,189.65 as chip-related shares kept falling, Reuters reported via Business Recorder. Energy shares rose on Monday on higher oil prices. The [Japan stocks daily brief for October 26](https://bullquill.com/japan-stocks-daily-brief-2026-10-26/) sets out those drivers in detail.

## What it means

Tuesday's rebound shows how tightly the Nikkei is tied to US sentiment on artificial intelligence. A few heavyweight stocks, led by Advantest, SoftBank Group and Tokyo Electron, account for much of the index's daily swings, so news that revives the AI trade on Wall Street can move Tokyo by 2% within an hour. The test comes quickly. The Federal Reserve begins a two-day meeting on Tuesday, CNBC noted, and the Bank of Japan meets on October 29–30, with Trading Economics reporting that both are expected to hold rates. Big US tech earnings later this week, including Microsoft, Alphabet and Amazon, could confirm or undercut the optimism behind today's move.

## Frequently asked questions

### Why did the Nikkei jump on October 27, 2026?

CNBC and Trading Economics linked the rise to Wall Street's gains on Monday and optimism over Anthropic's US IPO filing, which lifted AI and chip stocks such as Advantest, SoftBank Group and Tokyo Electron. Lower oil prices also helped. No Japan-specific trigger has been reported.

### Where did the Nikkei close on October 26, 2026?

The Nikkei 225 fell 0.80% to 62,189.65 on Monday, October 26, its third straight loss and lowest close since July 30, according to Reuters.

### When does the Bank of Japan meet next?

The Bank of Japan's next policy meeting is on October 29–30, 2026, with the decision due on October 30\. Trading Economics reported that markets expect it to hold rates.

This article is for information only and is not investment advice.