The paper, which is currently facing the possibility of job cuts under a review announced by Trinity Mirror three weeks ago, sold almost 57,000 fewer copies than in September, leaving it at 1.684m copies.
A Trinity Mirror spokesman said: "We continue to invest in our brands, both in content and marketing, but unlike our competitors, we're not going to use marketing just to attain a number. The fact that we are maintaining our market share is testament to the success of this approach."
However, the Mirror's problems were repeated across the entire market, with only The Times and The Independent making gains.
Even the relaunched Guardian could not sustain its sales charge, dropping 0.22% to 403,297 in its first full month in its new format.
The Daily Telegraph just held above its own watermark with a 0.29% decline to 901,667.
In contrast, The Independent enjoyed a 1.71% rise to 267,037, and fellow compact The Times passed a milestone with a 0.58% rise to 703,492.
Howver, News International's tabloid The Sun continued to sink, dropping 2.3% to 3.224m, in common with the Daily Star, down 4% to 820,028.
In the mid-market, the Daily Express lost 2.47% to 810,827 and the Daily Mail lost 0.97% to 2,350,694.
At the Financial Times, new editor Lionel Barber has to contend with a 4.4% drop to 419,249.
The best news was at the Independent on Sunday, which conversion to the compact format on October 16 pushed it up 13.27% to 230,053, while The Observer enjoyed a 3.06% rise to 451,781.
The Sunday Times rose 2.08% to 1.404m, while the Sunday Telegraph choked on a 4.03% fall to 661,425 ahead of its relaunch, the first issue of which appeared last week.
The quality category was up overall, but the mid-market and tabloids suffered. The Sunday Express fell 3.52% to 829,064 and the Mail on Sunday fell 2.24% to 2.292m. Trinity Mirror suffered a further blow with the Sunday Mirror, down 4.91% to 1,457,792, while News International's News of the World was up 0.11% to 3.773m.
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