致尚科技 (301486) jumped +10.03% on 2026-10-08: Stock-specific move? After-close breakdown

Price & volume (60 sessions up to the event day)

Risk reference：Close ± 1.5 × ATR14 — a volatility yardstick, not an entry/exit signal

Historical analogue event study

In 2024-08-26~2026-10-08, 62 sessions moved up ≥ 6.0%

Baseline (all sessions): next-day up 51%, avg next +0.52%, avg 5-day +2.42% — no statistically distinguishable edge.

Attribution & commentary

Market mood

301486 jumped +10.03% on CNY 2.48bn of turnover, ranking among the session's top gainers amid elevated momentum participation.

Key data

Closed at CNY 209.86, +10.03% (daily limit ±20% for this board), turnover CNY 2.48bn, turnover rate 16.05%.

Cause check: Stock-specific move

The ChiNext Index moved -3.15% versus +10.03% for the stock, a relative deviation of 13.18 points beyond the 3pp idiosyncratic threshold. Such deviations typically reflect filings, thematic flows or concentrated positioning; drivers should be verified against exchange disclosures. No unverified attribution is made.

Commentary

Post-surge intraday reversals are the most common loss pattern for momentum entries. Define the invalidation level and maximum loss before entry rather than reacting to the day's gain.

Volume & volatility

Volume 1.61x the 20-day average; the move ranks at the 91th percentile of daily moves; ATR14 is 7.33% of price.

Historical analogues

62 sessions in 2024-08-26~2026-10-08 moved the same way by ≥ 6.0%. Next-day up rate 50%, average next day +0.38%, average 5-day +2.20%, 5-day continuation 53%, average adverse excursion -8.20%. 95% confidence interval for the next-day up rate: 38%–62%; unconditional baseline across all sessions in the window: 51% up, average next day +0.52%, average 5-day +2.42%. The baseline lies inside the interval: no statistically distinguishable edge versus an ordinary day. Stability: earlier half 61% vs later half 39%. Event statistics, not a strategy backtest or forecast.

Risk takeaway

Momentum entries without a predefined invalidation level lack a reviewable trade structure. Quantify the loss-if-wrong before participating.

Falsification conditions

This reading treats the session as a single-day upside shock. It is invalidated if, within 5 sessions, price closes above 232.94 (1.5×ATR14 from the event close), which would indicate a trend rather than a shock; it is also invalidated if price closes below 186.78, which would indicate the shock has been fully absorbed.

Methodology & disclosures

Data: exchange end-of-day prices via Sina Finance, retrieved after the close; statistics use only sessions whose 5-day outcome was known on the event date (no look-ahead). Attribution compares the stock with its board index only; sector indices, filings and order-flow data are not included. Analogue statistics are event studies, not backtests: samples may overlap and are not tested out of sample. Generated automatically by rules; AI may only rephrase and any text whose numbers or volume wording disagree with the data is discarded. Simulated-practice research; not investment advice. Aegis Quant holds no position in the security.