LONDON -- The FTSE 100 (FTSEINDICES: ^FTSE) opened the week with a rise of a few points, and looked like it might even be heading to beat last May's 6,876 level and set a new 14-year record.

But then on Thursday came news of a January manufacturing slowdown in the U.S., and London's top index fell to a five-week low of 6,664 by close on Friday -- a weekly drop of 165.6 points, or 2.4%.

Which individual FTSE 100 stocks moved the most? Here are four.

Fresnillo (FRES -2.26%)
Last week we saw improving analyst sentiment giving base metals miners a boost, but they've fallen back a little this week, and the diggers of gold and silver have enjoyed a rise instead.

The biggest gain in the sector this week went to Fresnillo, which unearths silver and gold in Mexico. The stock ended the week at 792 pence, up 60 pence (8.2%), but it's still down nearly 55% over the past 12 months.

Hargreaves Lansdowne (HL -1.48%)
The price of Hargreaves Lansdowne fell after the investment manager told us on Jan. 15 that the U.K.'s Retail Distribution Review is likely to lead to "an £8 million investment in lower client charges by HL in the first 12 months of operation."

But this week the stock bounced back 56 pence (3.9%) to end Friday at 1,509 pence. After more than doubling over the past 12 months, Hargreaves Lansdowne stock is now at a forward P/E of 37 for the year ending December 2014.

Pearson (PSON -1.78%)
A profit warning on Thursday sent the price of educational publisher Pearson tumbling, and it finished Friday 109 pence (8.5%) down at 1,171 pence.

Earnings for 2013 are now expected to come in at about 70 pence per share, which is lower than analysts' forecasts, caused mainly by falling margins in the North American higher education market and restructuring costs from the Penguin-Random House merger.

Aberdeen Asset Management (ADN)
Aberdeen Asset Management stock has been sliding since the end of December, losing 20% so far in 2014. And this week we saw 41.7 pence (9.4%) lopped off the price to 397.3 pence, plunging to an overall loss over the past 12 months.

The firm's quarterly update on Jan. 16 didn't help, telling us of a 3.4% drop in assets under management to 193.6 billion pounds, with gross inflows falling 29% from the same period a year previously to 6.8 billion pounds.

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