Belgium: Monthly Stock Market Performance Insight - December 2025

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Monthly Gainers

Monthly Losers

Average Return

0.98%

Total Stocks

159

View Detailed Market Cap Breakdown

Market Cap	Monthly Gainers	Monthly Losers	Average Return	Total Stocks
Large Cap	24	14	0.88%	40
Mid Cap	22	11	1.74%	35

Monthly Streak Leaders for December 2025

All (9) Large Cap (4) Mid Cap (4) Small Cap (1)

Stock	Streak	Streak Return
K KBC Group NV \| KBC Financial Services \| Large Cap	8 months ↑	34.82%
KBC Group NV shows consistent strength with a 8-month winning streak (82.52 → 111.25), delivering 34.8% gains. With 2.9B revenue generating only 546.0M profit (18.8% margin) in Qtr ending Mar 2025, the market prices in future margin expansion potential.
O Orange Belgium S.A \| OBEL Communication Services \| Large Cap	8 months ↑	26.97%
Orange Belgium S.A shows consistent strength with a 8-month winning streak (15.20 → 19.30), delivering 27.0% gains. With 351.0M revenue generating only 14.4M profit (4.1% margin) in Qtr ending Dec 2021, the market prices in future margin expansion potential.
P Proximus \| PROX Communication Services \| Large Cap	2 months ↓	-5.10%
Proximus consolidates with a 2-month decline (7.45 → 7.07), down 5.1%. Weak margins on 1.6B revenue with only 140.0M profit (8.6% margin) in Qtr ending Mar 2025 validate market skepticism. Structural improvements needed before sentiment shifts.
G Gimv NV \| GIMB Financial Services \| Large Cap	2 months ↓	-4.59%
GIMB has posted 2 consecutive negative months with 4.59% losses.
I Ion Beam \| IBAB Healthcare \| Mid Cap	3 months ↑	21.89%
IBAB maintains strong performance with 3 straight positive months, gaining 21.89%.
H Hyloris \| HYL Healthcare \| Mid Cap	2 months ↑	16.33%
Hyloris gains traction with a 2-month winning streak (5.88 → 6.84), delivering 16.3% gains. Despite 19,000 in revenue and - 2.2M loss (-11378.9% margin) as of Qtr ending Jun 2020, the market sees potential beyond current profitability. This momentum suggests confidence in future execution.
B Barco N.V \| BAR Technology \| Mid Cap	4 months ↓	-15.49%
BAR under pressure with 4 straight negative months, declining 15.49%.
C CFE \| CFEB Industrials \| Mid Cap	3 months ↓	-6.96%
CFEB under pressure with 3 straight negative months, declining 6.96%.
C CMB Tech N.V \| CMBT Energy \| Small Cap	1 months ↓	-12.03%
CMB Tech N.V takes a breather following a 1-month decline (10.97 → 9.65), down 12.0%. However, fundamentals remain robust: 235.0M revenue generating 40.4M profit (17.2% margin) as of Qtr ending Mar 2025 suggests this could be a temporary setback. Value hunters take note.

Belgium Market Monthly Gainers & Losers: December 2025

All (20) Large Cap (10) Mid Cap (10)

Top Belgium Stock Gainers (December 2025)

Stock	Month Open	Month Close	Monthly Change	Avg Daily Volume	Month Volume
V Viohalco S.A \| VIO Industrials \| Large Cap	€9.80	€11.84	18.99%	5.7K	124.6K
U Umicore \| UMI Industrials \| Large Cap	€15.12	€17.90	18.15%	607.1K	13.4M
T Titan Cement \| TITC Basic Materials \| Large Cap	€45.65	€52.70	15.32%	15.7K	344.8K
M Melexis N.V \| MELE Technology \| Large Cap	€53.20	€57.50	8.49%	66.2K	1.5M
F Fluxys Belgium NV \| FLUX Energy \| Large Cap	€17.70	€18.50	5.41%	3.8K	84.2K
C Compagnie du Bois \| COMB Financial Services \| Mid Cap	€244.00	€289.00	18.44%	1.0K	22.8K
I Ion Beam \| IBAB Healthcare \| Mid Cap	€11.20	€12.92	14.74%	28.5K	626.8K
H Hyloris \| HYL Healthcare \| Mid Cap	€6.00	€6.84	14.38%	9.8K	214.6K
F Floridienne S.A \| FLOB Industrials \| Mid Cap	€575.00	€660.00	13.79%	88	1.9K
B Bpost SA \| BPOST Industrials \| Mid Cap	€1.89	€2.05	7.89%	203.4K	4.5M

Biggest Belgium Stock Losers (December 2025)

Stock	Month Open	Month Close	Monthly Change	Avg Daily Volume	Month Volume
C CMB Tech N.V \| CMBT Energy \| Large Cap	€9.45	€8.11	-14.54%	220.2K	4.8M
E Euronav NV \| EURN Energy \| Large Cap	€9.45	€8.11	-14.54%	220.2K	4.8M
S Shurgard Self \| SHUR Real Estate \| Large Cap	€32.15	€29.30	-9.15%	63.1K	1.4M
A Argenx SE \| ARGX Healthcare \| Large Cap	€778.00	€716.80	-8.38%	71.3K	1.6M
C Colruyt Group N.V \| COLR Consumer Defensive \| Large Cap	€33.10	€31.50	-4.95%	55.7K	1.2M
O Ontex Group N.V \| ONTEX Consumer Defensive \| Mid Cap	€6.48	€4.90	-24.50%	246.5K	5.4M
M Moury Construct S.A \| MOUR Industrials \| Mid Cap	€590.00	€564.00	-5.05%	112	2.5K
K Kinepolis Group NV \| KIN Communication Services \| Mid Cap	€31.20	€30.00	-4.00%	25.2K	553.3K
N Nyxoah S.A \| NYXH Healthcare \| Mid Cap	€4.30	€4.09	-3.99%	48.6K	1.1M
B Barco N.V \| BAR Technology \| Mid Cap	€12.24	€11.84	-3.74%	125.6K	2.8M

Most Active Belgium Stocks During December 2025

All (10) Large Cap (5) Mid Cap (5)

Stock	Month Open	Month Close	Monthly Change	Avg Daily Volume	Monthly Volume
A Anheuser-Busch InBev \| ABI Consumer Defensive \| Large Cap	€52.78	€54.90	3.55%	1.5M	33.5M
U Umicore \| UMI Industrials \| Large Cap	€15.12	€17.90	18.15%	607.1K	13.4M
A Azelis Group NV \| AZE Basic Materials \| Large Cap	€9.26	€9.35	0.75%	553.5K	12.2M
K KBC Group NV \| KBC Financial Services \| Large Cap	€106.20	€111.25	4.80%	388.4K	8.5M
P Proximus \| PROX Communication Services \| Large Cap	€7.43	€7.07	-4.59%	359.7K	7.9M
O Ontex Group N.V \| ONTEX Consumer Defensive \| Mid Cap	€6.48	€4.90	-24.50%	246.5K	5.4M
B Bpost SA \| BPOST Industrials \| Mid Cap	€1.89	€2.05	7.89%	203.4K	4.5M
O Onward Medical N.V \| ONWD Healthcare \| Mid Cap	€4.45	€4.49	1.58%	127.2K	2.8M
B Barco N.V \| BAR Technology \| Mid Cap	€12.24	€11.84	-3.74%	125.6K	2.8M
C Care Property Invest \| CPINV Real Estate \| Mid Cap	€11.97	€11.86	-0.59%	107.3K	2.4M