Biggest ASX share price moves in September 2025, and why
In September 2025, 101 ASX share moves had a cause we could name. The biggest rise was Starpharma (SPL) at +73.1%, on contract news. The biggest fall was Nine Ent. (NEC) at −35.9%, on unknown news. Moves are the explained ones the site flagged that month, by the size of the day's move as it ended; the kind of news is the platform's reading of the news that day. General information only, not financial product advice.
Biggest rises (78 in the month)
- SPLStarpharmaContract · 22 Sep+73.1%
- 4DX4DMedicalRegulatory · 3 Sep+50.0%
- CXUCauldronContract · 11 Sep+50.0%
- 4DX4DMedicalContract · 8 Sep+49.5%
- 4DX4DMedicalRegulatory · 1 Sep+36.0%
- TM1Terra MetalsOperational · 22 Sep+34.8%
- AT4Amer. TungstenSector Flow · 25 Sep+31.8%
- SRLSunrise EnergyContract · 16 Sep+29.9%
- AVHAvita MedicalRegulatory · 16 Sep+28.5%
- RMLResolutionCapital Raise · 15 Sep+25.0%
Biggest falls (23 in the month)
- NECNine Ent.Unknown · 11 Sep−35.9%
- PYCPYC Thera.Management · 17 Sep−30.0%
- 4DX4DMedicalUnknown · 9 Sep−27.5%
- REGRegis HealthRegulatory · 22 Sep−26.2%
- MYRMyerEarnings Miss · 23 Sep−25.0%
- PLSPLS GroupCommodity · 10 Sep−17.3%
- MYXMayne PharmaTakeover / M&A · 8 Sep−14.8%
- ILUIluka ResourcesOperational · 10 Sep−14.2%
- IGOIGOCommodity · 10 Sep−14.0%
- BOEBoss EnergyOperational · 11 Sep−12.2%
Top 10 each way. Percentages are the move on the day it was flagged.
What kind of news
- Operational24 moves
- Sector Flow18 moves
- Contract16 moves
- Commodity14 moves
- Unknown7 moves
- Regulatory6 moves
- Takeover / M&A6 moves
- Capital Raise2 moves