No. 5
Market temperatureSmall Cap Market Map heatVery hot

Market breadthUp1,043Down1,842Flat70Gap-ups (≥1M shares) 698

No. 5Closed 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 : PDSB, BNC and WYHG

Rank 1PDSBPDS Biotechnology Corp

Opening gap
+121.82%
Day
+36.36%
HOD (ET)
0.65109:33 ET
Est. turnover
$209.7M
Gap-ups (≥1M shares)
698

On Tuesday, September 8, 2026, 698 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 PDSB at +121.82%.

PDSB (PDS Biotechnology Corp) opened at 0.488, +121.82% from the previous close of 0.22. Its high of day was 0.651 at 09:33 ET. It closed at 0.3, +36.36% on the day, on an estimated $209.7M of turnover. SEC filings and news were not collected for this session.

ISPC (iSpecimen Inc.) opened at 1.91, +23.70% from the previous close of 1.54. Its high of day was 2.17 at 04:29 ET. It closed at 1.59, +3.25% on the day, on an estimated $26.6M of turnover.

BJDX (Bluejay Diagnostics, Inc.) opened at 1.02, +23.14% from the previous close of 0.8324. Its high of day was 1.18 at 07:33 ET. It closed at 1.03, +23.74% on the day, on an estimated $48.2M of turnover.

Pre-market: 5 of 7 highs of day.

Across the small caps the map tracks, 1,043 advanced and 1,842 declined, with an estimated $16.6B in dollar volume.

Behind it in the ranking: BJDX +23.14% (+23.74% on the day); TWG +19.40% (+17.75% on the day); PHVS +16.20% (+7.35% on the day); EAF +14.68% (+1.61% on the day).

Behind it in the ranking: TWG +19.40% (+17.75% on the day); PHVS +16.20% (+7.35% on the day); EAF +14.68% (+1.61% on the day).

SEC filings and news were not collected for this session.

Continued in Why they moved

Stocks in focus

  1. Rank 2BNC+53.87%Day +50.43%

    CEA Industries Inc.

    High of day 6.73 at 04:21 ET; estimated turnover $377.6M.

  2. Rank 3WYHG+35.96%Day +44.83%

    Wing Yip Food Holdings Group Ltd

    High of day 6.36 at 05:03 ET; estimated turnover $113.0M.

  3. Rank 4ARBE+29.90%Day +16.93%

    Arbe Robotics Ltd.

    High of day 1.02 at 07:49 ET; estimated turnover $86.4M.

  4. Rank 5MOBX+27.41%Day +36.54%

    MOBIX LABS, INC

    High of day 1.48 at 09:58 ET; estimated turnover $173.7M.

Stored Top Gappers ranking and HOD archive

Learning corner

Lessons and terms behind this session

Market map & FESCI

The Small Cap Market Map for this session loads here.Market Map data as of

Small-cap dollar volume (est.)
$16.6B

Top movers

Held or faded

3 of 10 closed at or above the open

Stored Top Gappers ranking

HOD timing

Pre-market: 5 of 7 highs of day

The Gapper HOD Timeline for this session loads here.

  1. Pre-market04:00–09:305 of 7
  2. First 30 minutes09:30–10:002 of 7
  3. Morning10:00–12:000 of 7
  4. Afternoon12:00–16:000 of 7
  5. After hours16:00–20:000 of 7

Further reading

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.