LARGE brokerages increased their market share at the expense of smaller ones last month, according to a report released by the Hong Kong stock exchange. The monthly report shows that Category A brokers, comprising the top 14 brokerages, and Category B brokers, ranking from 15th to 65th, both raised their shares of turnover. Category A brokerages boosted their market share to 38.55 per cent from 38.4 per cent in September, and up 3.33 percentage points on the figure for July. Category B brokers increased their share to 33.4 per cent in October from 32.46 per cent in September. The share of turnover commanded by Category C brokerages, those ranked from 65th onwards, shrank to 28.06 per cent from 29.14 per cent. This confirms the group's downward trend. In July, C brokers had a market share of 32.02 per cent. Turnover for the month rose to $80.08 billion from $77.05 billion in September. For the financial year so far, which started in July, turnover totals $300.11 billion, giving a monthly average of $75.03 billion.