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TCBIO Gap and Gap Fill

Updated Nov 6, 2026, 7:23 AM ET · Gap = today's open vs the prior close
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On Oct 7 TCBIO opened at $18.45, a gap down of $0.05 (0.3%) from the prior close of $18.50. The gap was not filled: the fill level is $18.50.
Best for: intradayHold: same dayPrice $18.28 · 15-min delayed
Gap−0.3%
Fill level18.50
Filled?No
Avg gap (10 days)0.3%

TCBIO daily chart: gap fill level

1818.51919.52020.521Aug 26Sep 2Sep 10Sep 17Sep 24Oct 118.50Gap fill (prior close) 18.5018.45Open 18.4518.28
- - - gap fill level (prior close)- - - open

Where TCBIO sits in its zone

The delayed price $18.28 is at the bottom 25% of its daily zone ($18.23 – $18.82).

18.23 · bottom 25%middletop 25% · 18.82
  • Setups to watch: a reversal up from the zone bottom, or a break below it.
  • Prior move: TCBIO moved down from $19.10 (the last daily swing) to $18.28, about 2.0 ATR. The move is not stretched yet.
  • Reversal check: a hammer or bullish engulfing candle near $18.23.
  • Breakout check: RVOL above normal on the break (last day's RVOL: 0.9× on Oct 7).
  • Zone tests: price pushed above the zone top 1 time and fell back, and dipped below the bottom and recovered 1 time. Each test can weaken a zone.
  • Distance: 0.13 ATR to the zone bottom, 1.35 ATR to the zone top (ATR ≈ 0.40).

Why gap matters

A gap shows news or orders that came in while the market was closed. Many traders watch whether price comes back to the prior close to "fill" the gap, or keeps running away from it.

How traders use it

  • Gap and go: a gap that holds above the premarket high (or below the low) often keeps running.
  • Gap fill: a gap that fades back toward the prior close; the fill level is the target traders watch.
  • Big gaps on news fill less often than small gaps on no news.

What happened over the last 10 days

  • Of the 3 gaps bigger than 0.3%, 3 filled the same day.
  • The average gap was 0.3%.
  • Round numbers nearby: $17.00, $18.00, $19.00.

Combined conditions

  • VWAP $18.25 is below the fill level.
  • The delayed price is at the bottom 25% of the daily zone: the reversal and breakout setups are both live.
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How to trade around TCBIO's gap levels

1. Gap fill tradeIf TCBIO moves back toward $18.50, that fill level is the first target traders watch; a reversal before it keeps the gap open.
2. Gap and goA gap that holds its first pullback and breaks the premarket low with RVOL is read as continuation.

For more setups and trading strategies, click here →

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TCBIO gaps: last 10 days

DatePrior closeOpenGapFilled?
Oct 718.5018.45−0.3%No
Oct 618.8618.78−0.4%Yes
Oct 518.9018.80−0.5%Yes
Oct 218.8418.84+0.0%Yes
Oct 118.4018.35−0.3%Yes
Sep 3018.5418.58+0.2%Yes
Sep 2918.4318.32−0.6%Yes
Sep 2818.7018.64−0.3%No
Sep 2518.8918.85−0.2%Yes
Sep 2418.8918.90+0.1%Yes

FAQ

Did TCBIO gap up or down today?

On Oct 7 it gapped down 0.3% ($18.50 → $18.45).

On SEPT: see every gap drawn on your chart with its fill level. Try it free →
Did TCBIO fill its gap?

No, it did not trade back to the prior close of $18.50.

On SEPT: get an alert when TCBIO fills its gap. Try it free →
What is a gap fill?

When price moves back to the prior close after opening with a gap up or down.

On SEPT: screen for stocks filling their gap right now. Try it free →
How often does TCBIO fill its gaps?

In the last 10 days, 3 of 3 gaps bigger than 0.3% filled the same day.

On SEPT: test gap-fill odds on years of real data. Try it free →
Do all gaps get filled?

No. Many small gaps fill, but big gaps on news can run for days without filling.

On SEPT: ask GOAX what is behind today's gap. Try it free →
What is gap and go?

A gap that keeps running in its direction after the open instead of filling.

On SEPT: build a gap-and-go alert with your own confirmation and entry conditions. Try it free →
Where is TCBIO in its zone now?

At the bottom 25% of the daily zone ($18.23 – $18.82), based on the delayed price.

On SEPT: see TCBIO's zone position live and let GOAX alert you at the zone edge. Try it free →

Data: SEPT market data engine. Delayed data; real-time levels are on the SEPT platform. Times in Eastern Time. Educational information only, not investment advice. No odds or win rates are shown on this page.