Top movers in Friday's after hours session

By Mill Chart - Last update: Dec 19, 2025

Discover the top movers in Friday's after-hours session and stay informed about the post-market dynamics.


postmarket

After hours gainers

TickerChangeComment
YMAT20.41%J-STAR HOLDING CO LTD-A's (NASDAQ:YMAT) stock price increased by 20.41% to $0.78. In the last month the stock lost 21.68%.
PRPH15.94%In the after-hours session on Friday, PROPHASE LABS INC (NASDAQ:PRPH) experienced a notable 15.94% increase, driving its shares to $0.1. After experiencing a -14.65% decline earlier today, PRPH shows signs of a rebound in today's after-hours session.
IRBT12.35%Positive after-hours movement for IROBOT CORP (NASDAQ:IRBT) as its shares recorded a 12.35% increase, reaching $0.52 during Friday's after-hours session. After today's drop of -30.05%, it looks like it is bouncing back during today's after hours session.
AIIO8.78%Impressive after-hours gains for ROBO.AI INC (NASDAQ:AIIO) as its stock price advanced 8.78% to $0.34 during Friday's after-hours session. Yesterday's -34.37% decline in AIIO has given way to a potential bounce-back as observed in today's after-hours session.
GLE8.2%GLOBAL ENGINE GROUP HOLDIN-A's (NASDAQ:GLE) shares rose 8.2% to $0.5. Shareholders saw the stock price going 47.43% lower in the past 3 months.
YCBD7.95%CBDMD INC's (NYSEARCA:YCBD) shares rose 7.95% to $1.63 during Friday's after hours session. Only today these shares were declining by -21.76%, so we see a bit of recovery during the after hours session.
ELPW6.69%Impressive after-hours gains for ELONG POWER HOLDING-A (NASDAQ:ELPW) as its stock price advanced 6.69% to $0.17 during Friday's after-hours session. The stock is trading 20.24% lower than a month ago.
VMAR6.63%Impressive after-hours gains for VISION MARINE TECHNOLOGIES (NASDAQ:VMAR) as its stock price advanced 6.63% to $0.27 during Friday's after-hours session. In the last month the share price dropped with 77.24%.
RKLB5.23%After the regular session, ROCKET LAB CORP (NASDAQ:RKLB) continues to impress in the after-hours session, with a 5.23% increase to $74.21. Today's gain of 17.69% continues in today's after hours session with 5.23%. Earlier today the company had a press release: Rocket Lab Awarded $816M Prime Contract to Build Missile- Defense Satellite Constellation for U.S. Space Force.
ASTI5.2%ASCENT SOLAR TECHNOLOGIES (NASDAQ:ASTI) rose 5.2% to $4.45 during Friday's after hours session. Building upon today's 37.79% gain, ASTI demonstrates resilience and ongoing growth in the after-hours session.

To see the full list of after hours gainers you can use our after hours gainers page.

After hours losers

TickerChangeComment
AMST-15.79%AMESITE INC's (NASDAQ:AMST) stock price is declining with 15.79% to a price of $2.24. Despite a strong 17.18% gain earlier today, AMST is experiencing a reversal in after-hours trading, with prices declining by 15.79%.
IBO-12.48%IMPACT BIOMEDICAL INC's (NYSEARCA:IBO) shares fell 12.48% to $0.57. The positive momentum earlier in the day is waning as IBO retraces 46.26% during the after-hours session.
BYSI-10.21%Following a 25.67% loss in the regular session, BEYONDSPRING INC (NASDAQ:BYSI) exhibits further decline during today's after-hours session. Price movements remain volatile as BYSI gives back 25.67% of its earlier gains in the after-hours session.
VIVK-9.66%VIVAKOR INC's (NASDAQ:VIVK) stock price is declining with 9.66% to a price of $0.07. The stock is trading 35.78% lower than a month ago.
GPUS-9.41%HYPERSCALE DATA INC's (NYSEARCA:GPUS) stock price is showing a decline of 9.41% to a price of $0.23 during the after-hours session. In the last month the share price increased with 23.25%.
SGD-8.94%Today's after-hours session sees a continuation of the 42.26% decrease earlier in the day for SAFE & GREEN DEVELOPMENT COR (NASDAQ:SGD). After running up 42.26% in today's session, SGD is pulling back after hours.
LAZR-8.24%Price volatility persists as LUMINAR TECHNOLOGIES INC (NASDAQ:LAZR) closed the regular session with a 175.0% loss, and the downward trend continues in the after-hours session. Today's after-hours session indicates a reversal in LAZR's earlier 175.0% gain, with prices exhibiting heightened volatility.
ZYXI-8.1%ZYNEX INC's (NASDAQ:ZYXI) shares fell 8.1% to $0.27 during Friday's after hours session. In the last month the share price dropped with 38.39%.
UGRO-7.97%URBAN-GRO INC's (NASDAQ:UGRO) shares fell 7.97% to $0.33 during Friday's after hours session. In the last month the stock gained 53.91%.
BIYA-7.22%The after-hours session reflects BAIYA INTERNATIONAL GROUP IN (NASDAQ:BIYA)'s ongoing correction after experiencing a %ABSPERF% loss in the regular trading hours. In the last month the share price dropped with 27.01%.

To see the full list of after hours losers you can use our after hours losers page.

IROBOT CORP

NASDAQ:IRBT (12/19/2025, 8:00:02 PM)

After market: 0.4999 +0.03 (+7.18%)

0.4664

-0.2 (-30.05%)


ASCENT SOLAR TECHNOLOGIES

NASDAQ:ASTI (3/11/2026, 4:30:01 PM)

After market: 6.12 +0.14 (+2.34%)

5.98

-0.04 (-0.66%)


PROPHASE LABS INC

NASDAQ:PRPH (1/2/2026, 8:00:01 PM)

After market: 0.1814 -0.18 (-49.97%)

0.3626

-0.08 (-18.97%)


IMPACT BIOMEDICAL INC

NYSEARCA:IBO (3/11/2026, 4:32:58 PM)

After market: 0.554 +0 (+0.73%)

0.55

-0.06 (-9.84%)


ZYNEX INC

NASDAQ:ZYXI (12/23/2025, 8:00:03 PM)

After market: 0.13 +0.01 (+4%)

0.125

-0.07 (-34.9%)


CBDMD INC

NYSEARCA:YCBD (3/11/2026, 4:29:00 PM)

After market: 0.714 +0.01 (+1.71%)

0.702

+0.03 (+4.78%)


AMESITE INC

NASDAQ:AMST (3/11/2026, 4:30:01 PM)

After market: 1.9137 +0 (+0.19%)

1.91

-0.13 (-6.37%)


VISION MARINE TECHNOLOGIES

NASDAQ:VMAR (3/11/2026, 4:30:02 PM)

After market: 2.38 -0.03 (-1.24%)

2.41

+0.01 (+0.42%)


LUMINAR TECHNOLOGIES INC

NASDAQ:LAZR (12/23/2025, 8:16:50 PM)

After market: 0.1738 -0.01 (-7.75%)

0.1884

-0.03 (-13.46%)


URBAN-GRO INC

NASDAQ:UGRO (3/11/2026, 4:30:02 PM)

After market: 2.8 -0.02 (-0.71%)

2.82

+0.2 (+7.63%)


ROCKET LAB CORP

NASDAQ:RKLB (3/11/2026, 4:38:19 PM)

After market: 71.84 -0.12 (-0.17%)

71.96

+3.03 (+4.4%)


BEYONDSPRING INC

NASDAQ:BYSI (3/11/2026, 4:30:02 PM)

1.51

+0.04 (+2.72%)


VIVAKOR INC

NASDAQ:VIVK (12/24/2025, 5:03:31 PM)

After market: 0.037 +0 (+6.32%)

0.0348

-0.01 (-25.32%)


SAFE & GREEN DEVELOPMENT COR

NASDAQ:SGD (12/18/2025, 8:00:02 PM)

After market: 0.2293 -0.02 (-8.94%)

0.2518

+0.07 (+42.26%)


HYPERSCALE DATA INC

NYSEARCA:GPUS (3/11/2026, 4:39:43 PM)

After market: 0.1799 +0 (+0.45%)

0.1791

+0.01 (+7.31%)


GLOBAL ENGINE GROUP HOLDIN-A

NASDAQ:GLE (3/11/2026, 4:30:02 PM)

0.4081

+0.01 (+2.8%)


ELONG POWER HOLDING-A

NASDAQ:ELPW (3/11/2026, 4:39:28 PM)

After market: 0.0512 0 (-2.1%)

0.0523

-0.01 (-17.9%)


BAIYA INTERNATIONAL GROUP IN

NASDAQ:BIYA (3/11/2026, 4:30:02 PM)

After market: 2.1 -0.01 (-0.47%)

2.11

+0.18 (+9.33%)


J-STAR HOLDING CO LTD-A

NASDAQ:YMAT (3/11/2026, 4:06:50 PM)

0.352

-0.02 (-4.97%)


ROBO.AI INC

NASDAQ:AIIO (3/11/2026, 4:39:22 PM)

After market: 0.1293 0 (-2.42%)

0.1325

0 (-0.53%)



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