It's been an up and down start to December for ASX 200 shares.
The S&P/ASX 200 Index (INDEXASX: XJO) has edged just 0.05% higher as we head towards the Christmas/New Year period.
But while there have been some winners such as Lynas Corporation Ltd (ASX: LYC) in December, there have also been plenty of losers.
Here are 10 ASX 200 stocks that have fallen 10% or more since the start of December.
1. Smartgroup Corporation Ltd (ASX: SIQ)
The Smartgroup share price plunged 15.21% on the ASX yesterday after an earnings downgrade and has continued its downward slide today, falling another 6.33% to $7.10 per share at the time of writing.
The group's insurance underwriting partner is changing its insurance products and management is forecasting a reduction in net profit after tax of $4 million.
Smartgroup shares have now fallen 21.63% lower since the start of December.
2. Regis Resources Ltd (ASX: RRL)
The Regis Resources share price is down 14.04% since the start of the month.
The Aussie gold miner has struggled for capital gains and is down nearly 60% since 22 July.
Positivity around the US–China trade war and Brexit have put gold miners like Regis under pressure this month.
3. Sigma Healthcare Ltd (ASX: SIG)
The Sigma Healthcare share price was smashed 9.85% yesterday after Australian Pharmaceutical Industries Ltd (ASX: API) sold its stake in the group.
Sigma shares continued falling today, down another 5.55% in morning trade. The Sigma share price is now down 17.64% since the start of December, but flat for the year.
4. Boral Limited (ASX: BLD)
Boral shares are yielding 5.82% at the moment thanks to its 11.32% share price decline this month.
The Aussie building supplies group has downgraded profits 4 times in the last 18 months and plummeted lower after an update about "financial irregularities" in its windows business.
5. Whitehaven Coal Ltd (ASX: WHC)
Whitehaven shares have slumped lower in early December after an FY20 guidance downgrade.
The coal miner is forecasting lower earnings after a skills shortage has reduced output at its Maules Creek site.
Whitehaven shares are now down 13.65% since the start of the month.
6. Perenti Global Ltd (ASX: PRN)
Formerly Ausdrill Ltd, Perenti shares are down 15.30% since the start of December.
Perenti shares were smashed 18.66% yesterday after lowering its net profit forecast and announcing a contract termination and have fallen another 2.65% in morning trade today.
It hasn't been all bad news for shareholders in 2019, with the Perenti share price up 54.55% for the year.
7. Viva Energy Group Ltd (ASX: VEA)
Viva Energy shares fell 6% last Monday after downgrading its 2019 profit guidance.
Lower refining and retail market margins have put pressure on earnings and sent the Viva Energy share price crashing 14.47% lower this month.
8. McMillan Shakespeare Limited (ASX: MMS)
The salary packaging group's shares are down 11.29% this month after a trading update in early December.
Challenging conditions across Australia, New Zealand and the UK saw the group issue a negative outlook for FY20.
9. WiseTech Global Ltd (ASX: WTC)
The WAAAX stock has been one of the worst performers amongst the ASX 200 this month.
WiseTech shares are down 13.70% since the start of December thanks to the US–China trade war rhetoric.
The ongoing volatility in trade relations has seen WiseTech shares hammered, but they're still up 39.63% for the year.
10. Treasury Wine Estates Ltd (ASX: TWE)
The Treasury Wine share price has slumped 10.86% since the start of December.
The Aussie winemaker's shares have been under pressure after a copycat threat to its Penfolds brand surfaced.
The group is looking to protect its premium label but the China-based threat has put its share price under pressure.
