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Other material information
n=765as of 2026-07-09
Material information filings not assigned to a specific category.
| Window | Benchmark | n | Mean abnormal return | Median | q value | Significant |
|---|---|---|---|---|---|---|
| Event day | BHAR | 644 | +0.35% | +0.05% | 0.076 | Yes |
| 5 trading days after | BHAR | 593 | +1.57% | -0.36% | 0.004 | Yes |
| 20 trading days after | BHAR | 324 | +5.90% | +1.74% | 0.000 | Yes |
Method: the filing's public-availability date is day 0, with a conservative entry on the following trading day. CAR (cumulative abnormal return) is estimated with a market model and calibrated by a placebo test that keeps the event dates but draws random same-day tickers. BHAR (buy-and-hold abnormal return) is measured against size- and liquidity-matched control stocks. All tests carry a multiple-testing correction (BH-FDR). Where the two benchmarks disagree, both are shown as they are — we do not pick the flattering one.
Frequently asked questions
How do Taiwan share prices behave after an uncategorised material filing goes out?
Across n=765 historical events measured by this site's event study engine, mean abnormal return +0.35% on the event day (BHAR benchmark). Both CAR and BHAR benchmarks are presented, flagged where they disagree. This is not investment advice.
How large is the sample when an uncategorised material filing goes out?
765 events, as of 2026-07-09, of which 6 statistical cells clear the significance threshold.
Other event categories
The above is a statistical view of historical events (base rates). It is not investment advice and not a trading signal; a historical distribution does not guarantee the future repeats it. Source: This site's event study engine (computed in-house from official public-source event data; editorial copyright)