LONDON -- The FTSE 100 (INDEX: ^FTSE) continues its good week, gaining another 20 points today to 5,703 in what could be its best week for a while. Is it sustainable? That depends a lot on what noise comes out of Europe over the next few months, but let's hope so.

Naturally, every day there are some shares beating the indexes and some falling behind. Here's a quick look at three of today's risers.

Aero acquisition
Shares in GKN (LSE: GKN.L) soared in morning trading, quickly gaining 25 pence for a 13% rise to 211 pence after the vehicles and aviation engineer announced a new acquisition. For the sum of $985 million, paid mostly in shares, GKN will take over the aero engine division of Volvo Aero, which makes components for engine turbines which are used in most civil aviation engines.

It's a welcome boost to the share price, which has fallen a little over the past couple of years. The shares are now on a forward price-to-earnings ratio of just eight for the full year, with a 3.5% dividend expected.

Softly does it
Dunelm Group
(LSE: DNLM.L), the maker of bedding, curtains, and other soft furnishings, saw its price rise 4% to 532 pence after releasing an upbeat trading statement. Sales rose by 12% on the year, with like-for-like sales growth accounting for a 3.1% rise and 9% coming from new outlets. Pretax profit is expected to be ahead of the current consensus.

Today's rise has added to a good year for the shares, which are now up around 30%.

Board shake-up
Insurer Aviva (LSE: AV.L) saw its shares bumped up after it announced a reshuffle in the boardroom -- they're up 2% to 287 pence. Following the appointment of new chairman John McFarlane, David McMillan will take the post of group transformation director, charged with implementing the company's new strategy, and there will be a couple of further shuffles as directors play musical chairs to fill the gaps.

Something is needed to reverse Aviva's recent fortunes. Maybe this focus on a new strategy will be it.

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Alan does not own any shares mentioned in this article. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.