* KOSPI falls, foreigners net sellers

* Korean won strengthens against U.S. dollar

* South Korea benchmark bond yield rises

* For the midday report, please click

SEOUL, Oct 29 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares posted the sharpest weekly decline in three after ending more than 1% lower on Friday, as weak economic data and recent earnings at home and abroad pointed to supply chain woes that may further weigh on the economy.

** The won edged up, while the benchmark 10-year treasury bond yield surged to its highest in over three years.

** The KOSPI ended down 38.87 points, or 1.29%, at 2,970.68, extending the declines to a third straight day and logging the sharpest decline since Oct 12.

** For the week, it fell 1.18%, marking the fastest decline in three weeks after having lost 0.30% a week earlier.

** Among the heavyweights, chip giants Samsung Electronics and SK Hynix tumbled 1.27% and 3.29%, respectively, while battery maker LG Chem also dropped 1.65%.

** The country's factory output snapped 10 straight months of year-on-year growth in September, as global chip shortages hit production.

** The issue was highlighted in major corporate earnings at home, with Samsung Electronics and Hyundai Motor warning that the impact will affect manufacturers for the time being.

** Results from Apple Inc and Amazon Inc missed expectations, with those also expressing such concerns.

** Foreigners were net sellers of 800.6 billion won ($684.94 million) worth of shares on the main board.

** The won ended at 1,168.6 per dollar on the onshore settlement platform, 0.09% higher than its previous close.

** In offshore trading, the won was quoted at 1,169.5 per dollar, while in non-deliverable forward trading its one-month contract was quoted at 1,170.5.

** In money and debt markets, December futures on three-year treasury bonds fell 0.24 points to 107.86.

** The most liquid 3-year Korean treasury bond yield rose by 8.9 basis points to 2.102%, while the benchmark 10-year yield rose by 19.2 basis points to 2.583%. ($1 = 1,168.8600 won) (Reporting by Joori Roh, Editing by William Maclean)