(Sharecast News) - The FTSE 250 was up 0.86% at 20,797.66 at 1511 BST.
Shares in UK chemicals firm Johnson Matthey surged by more than 30% on Friday after the investment arm of New York-based Standard Industries took a 5.23% stake. Standard Latitude Master Fund disclosed the stake in a London Stock exchange filing.
Shares in manufacturer Rotork fell after the firm said first-quarter trading had been in line with internal expectations, with order intake growing "high-single digits" year-on-year on an organic constant currency basis despite a fresh wave of Covid cases in China leading to the shuttering of its key Shanghai factory.
Computacenter shares fell as the company stated that adjusted pre-tax profits at the end of the first half were likely to be behind 2021 but will still be in line with "the historical seasonality" of the business.
FTSE 250 - Risers
Johnson Matthey (JMAT) 2,226.00p 18.94%
Fidelity China Special Situations (FCSS) 253.50p 6.07%
Biffa (BIFF) 351.00p 5.91%
Coats Group (COA) 71.50p 5.30%
CMC Markets (CMCX) 291.00p 3.93%
Oxford Biomedica (OXB) 566.00p 3.85%
Playtech (PTEC) 529.50p 3.82%
Carnival (CCL) 1,295.50p 3.68%
Chemring Group (CHG) 347.00p 3.58%
International Public Partnerships Ltd. (INPP) 167.40p 3.33%
FTSE 250 - Fallers
Cranswick (CWK) 3,150.00p -8.48%
Computacenter (CCC) 2,646.00p -3.36%
Indivior (INDV) 320.40p -3.09%
Currys (CURY) 94.05p -2.69%
FDM Group (Holdings) (FDM) 1,016.00p -2.68%
Rotork (ROR) 295.20p -2.32%
Ferrexpo (FXPO) 163.40p -1.98%
Premier Foods (PFD) 110.80p -1.95%
Travis Perkins (TPK) 1,243.50p -1.85%
Morgan Advanced Materials (MGAM) 283.00p -1.74%