* KOSPI falls, foreigners net sellers

* Korean won strengthens against dollar

* South Korea benchmark bond yield falls

* For the midday report, please click

SEOUL, Aug 18 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares fell on Friday on worries over high U.S. treasury bond yields, ending the week with their worst drop in 11 months.

** The benchmark KOSPI closed down 15.35 points, or 0.61%, at 2,504.50, its lowest closing level since May 17.

** The KOSPI fell for a sixth straight session, its longest run of decline since mid-June 2022.

** For the week, the benchmark was down 3.35%, its fifth straight weekly loss and the biggest since late September 2022.

** "The market was weighed by U.S. tech stocks' overnight losses on a rise in bond yields," said Kim Seok-hwan, an analyst at Mirae Asset Securities.

** The number of Americans filing new claims for unemployment benefits fell last week, pointing to continued tightness in the labour market.

** Battery makers dragged the benchmark index lower. LG Energy Solution fell 2.04%, its parent LG Chem lost 2.07%, while peers Samsung SDI and SK Innovation dropped 1.81% and 3.01%, respectively.

** On the other hand, Celltrion jumped 4.74% on its plan to absorb its subsidiary Celltrion Healthcare .

** Of the total 934 issues traded, 360 rose, while 523 fell.

** Foreigners were net sellers of shares worth 61.9 billion won ($46.3 million) on the main board, ending the week with a weekly sale of 180 billion won.

** The won ended onshore trade at 1,338.3 per dollar, 0.28% higher than its previous close.

** The won still ended the week with a 1.00% loss, extending its weekly losses to a three.

** In money and debt markets, September futures on three-year treasury bonds rose 0.18 point to 103.48.

** The most liquid three-year Korean treasury bond yield fell by 5.3 basis points to 3.738%, while the benchmark 10-year yield fell by 6.8 basis points to 3.918%. ($1 = 1,338.1500 won) (Reporting by Jihoon Lee; Editing by Varun H K)