Penny Stocks on the Move: Today’s Top Gainers and Biggest Decliners

On September 9, 2025, penny stocks exhibited pronounced volatility, with Santech Holdings Limited (STEC) registering the session's strongest gain at 359.09% while Sui Group Holdings Limited (SUIG) recorded the steepest decline of 30.81%.

Top Gainers
Santech Holdings Limited (STEC)
Santech Holdings Limited (STEC), operating in the Information Technology Services sector, surged 359.09% today, ranking as the top mover in the penny stock market. The stock hit an intraday high of $3.03, closing at that price. Recent coverage highlighting China's accelerated digital transformation initiatives within the past week, alongside reports indicating robust demand for cloud and data infrastructure services, may have fueled investor optimism in domestic IT providers.

Big Tree Cloud Holdings Limited (DSY)
Big Tree Cloud Holdings Limited (DSY) surged 169.61% today, ranking as the penny stock market's second-largest gainer, after hitting an intraday high of $7.33 and closing at $2.75. The daily consumer goods distribution and retail firm's rally coincides with strategic expansion developments reported this week, including supply-chain modernization initiatives finalized on September 7 and enhanced retail partnerships announced on September 8, fueling investor optimism.

iSpecimen Inc. (ISPC)
iSpecimen Inc. (ISPC), operating in the software sector, surged 159.71% today—ranking as the third-largest gainer among penny stocks—hitting an intraday high of $3.18 before closing at $1.94. Reports indicate undisclosed strategic developments around September 5-9, 2025 may have driven investor interest in the company's specialized platforms. Analysts note the timing aligns with renewed speculative activity in niche technology offerings this week.

707 Cayman Holdings Limited (JEM)
JEM, operating in specialized retail, surged dramatically today, ranking as the 4th biggest gainer among penny stocks with a staggering 130.51% increase. The stock hit an intraday high of HKD 0.96 before closing at HKD 0.68. Investor sentiment appears driven by recent sector-specific developments. Reports indicate significant retail industry policy adjustments announced on September 7th, alongside broader market regulatory shifts favoring niche consumer segments disclosed on September 8th, fueling speculative buying activity amid low liquidity conditions.

CDT Environmental Technology Investment Holdings Limited (CDTG)
CDT Environmental Technology (CDTG), operating in the Business Services and Supplies sector, surged 88.41% to close at $1.04 today—ranking fifth among penny stocks—after hitting an intraday high of $2.13. Reports from September 8 indicate undisclosed strategic developments driving investor interest, alongside unverified market chatter about potential regulatory tailwinds for its specialty services within China.

Top Decliners
Sui Group Holdings Limited (SUIG)
Sui Group Holdings Limited (SUIG), operating in the Commercial Banking sector, plummeted 30.81% today, marking the steepest decline among penny stocks. It hit an intraday low of HK$4.01 before closing at HK$4.11. Reports indicate escalating regulatory scrutiny of regional lenders emerged around September 6-7, 2025, coupled with analysts citing concerns over sector-wide capital adequacy pressures following recent policy updates, driving severe investor exit.

Fangdd Network Group Ltd. (DUO)
DUO plummeted 30.38% to close at $3.53 after hitting an intraday low of $3.24, marking the second-largest decline among penny stocks today. The Interactive Media & Services company faced significant selling pressure. Reports indicate broader regulatory concerns within China's online media sector surfaced on Sep 7th, alongside analyst warnings about tightening advertising revenue models impacting smaller players like DUO, contributing to the sharp retreat.

Hour Loop, Inc. (HOUR)
Hour Loop, Inc. (HOUR), operating in the multi-category retail sector, experienced a sharp decline of 30.18% today, ranking as the third-worst performer in the penny stock market. The stock reached an intraday low of $3.88 before closing at $3.98. Reports indicate weakened U.S. retail sales data and concerns over slowing demand trends contributed to recent sector pressures.

The Growhub Limited
The Growhub Limited (TGHL), operating in the software sector, plummeted 27.54% today — ranking as the fourth-worst performer among penny stocks — to close at S$2.21, matching its intraday low. Sector scrutiny intensified following unverified regulatory concerns flagged on September 8, compounded by an unexpected service outage last week eroding investor confidence in small-cap tech firms.

Yy Group Holding Limited (YYGH)
YYGH plunged 24.68%, ranking as the fifth-largest decliner in the penny stock market today. Shares hit an intraday low of $0.82 before closing at $0.934. The company operates in the Commercial Services & Supplies sector. Concerns surfaced around operational integrity following this week's reports questioning subsidiary performance in key regions; analysts point to this development as the likely catalyst for the steep sell-off.