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No. 1
Market temperatureNot available for this session

Market breadthBreadth not stored for this sessionGap-ups (≥1M shares) 531

No. 1Closed 16:00 ETRanking stored Inside: Top movers A2 Why they moved A3 HOD timing A4 Market map & FESCI A5 Articles A6

Sections of this recap

Lead · largest opening gap

Top gappers on : BIAF, GPRO and WETO

1 of the top 10 had an SEC filing or a trading halt between the previous close and this session’s close.

Rank 1BIAFbioAffinity Technologies, Inc.

Opening gap
+69.30%
Day
+44.52%
HOD (ET)
8.6009:38 ET
Est. turnover
$331.9M
Gap-ups (≥1M shares)
531

On Tuesday, September 1, 2026, 531 US-listed common stocks and common-stock ADRs opened above their previous close with at least 1M shares of daily volume. The largest opening gap was BIAF at +69.30%.

BIAF (bioAffinity Technologies, Inc.) opened at 7.72, +69.30% from the previous close of 4.56. Its high of day was 8.60 at 09:38 ET. It closed at 6.59, +44.52% on the day, on an estimated $331.9M of turnover. SEC filings and news were not collected for this session.

FLYE (Fly-E Group, Inc.) opened at 1.80, +32.35% from the previous close of 1.36. Its high of day was 3.97 at 05:38 ET. It closed at 2.20, +61.76% on the day, on an estimated $184.2M of turnover.

Pre-market: 3 of 6 highs of day.

Behind it in the ranking: AMBR +19.83% (-24.13% on the day); YYGH +18.18% (+11.36% on the day); PETZ +17.39% (+28.70% on the day); NCPL +15.99% (+10.68% on the day).

Behind it in the ranking: AMBR +19.83% (-24.13% on the day); YYGH +18.18% (+11.36% on the day); PETZ +17.39% (+28.70% on the day); NCPL +15.99% (+10.68% on the day).

1 of the top 10 had an SEC filing or a trading halt between the previous close and this session’s close.

Continued in Why they moved

Stocks in focus

  1. Rank 2GPRO+54.07%Day +40.38%

    GoPro, Inc.

    High of day 1.83 at 06:23 ET; estimated turnover $704.5M.

  2. Rank 3WETO+40.24%Day +8.39%

    Wetour Robotics Ltd

    High of day 8.44 at 09:34 ET; estimated turnover $101.0M.

  3. Rank 4SSM+39.93%Day +77.43%

    Sono Group N.V.8-K

    FORM 8-K

    SEC EDGAR

  4. Rank 5LIDR+36.96%Day +27.83%

    AEye, Inc.

    High of day 1.81 at 08:39 ET; estimated turnover $199.4M.

Stored Top Gappers ranking and HOD archive

Learning corner

Lessons and terms behind this session

Market map & FESCI

The Small Cap Market Map was not recorded yet for this session.

Top movers

  1. 1BIAF+69.30%+44.52%
  2. 2GPRO+54.07%+40.38%
  3. 3WETO+40.24%+8.39%
  4. 4SSM+39.93%+77.43%
  5. 5LIDR+36.96%+27.83%
  6. 6FLYE+32.35%+61.76%
  7. 7AMBR+19.83%-24.13%
  8. 8YYGH+18.18%+11.36%
  9. 9PETZ+17.39%+28.70%
  10. 10NCPL+15.99%+10.68%

Continued in Top movers

Held or faded

3 of 10 closed at or above the open

Stored Top Gappers ranking

Further reading

A diagonal gap separates stone steps from a landing, interrupting a band of sunlight.Reading the sessionGap up, gap down, and premarket change: which price are you comparing?Learn how gap up and gap down are calculated, how opening gaps differ from premarket changes, and why the reference price and timestamp matter.By Greta Ji · 4 min read

Further reading

Why they moved

1 of the top 10 had an SEC filing or a trading halt between the previous close and this session’s close.

HOD timing

Pre-market: 3 of 6 highs of day

The Gapper HOD Timeline for this session loads here.

  1. Pre-market04:00–09:303 of 6
  2. First 30 minutes09:30–10:002 of 6
  3. Morning10:00–12:000 of 6
  4. Afternoon12:00–16:001 of 6
  5. After hours16:00–20:000 of 6

Method

Top Gappers Calendar default method: US-listed common stocks and common-stock ADRs, daily volume ≥ 1,000,000 shares, opening gap highest first

Every session in September 2026

Retrospective data built after the session from stored records, with links to the original sources. Not real-time, not investment advice and not a recommendation to buy or sell any security.