* KOSPI falls, foreigners net sellers

* Korean won weakens against dollar

* South Korea benchmark bond yield rises

SEOUL, Dec 27 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares fell on Wednesday as shares traded ex-dividend, which means that investors are locked out of rights to dividend payouts for listed companies this year. The deadline for rights to dividend payouts ended yesterday. ** The won weakened, while the benchmark bond yield rose.

** The benchmark KOSPI fell 8.91 points, or 0.34%, to 2,593.68 by 01:01 GMT.

** Among index heavyweights, chipmaker Samsung Electronics rose 0.78% and peer SK Hynix lost 0.99%, while battery maker LG Energy Solution climbed 0.96%.

** Hyundai Motor shed 0.55% and sister automaker Kia Corp lost 0.10%, while search engine Naver and instant messenger Kakao were up 0.46% and unchanged, respectively.

** Of the total 937 traded issues, 201 shares advanced, while 701 declined.

** Foreigners were net sellers of shares worth 114.8 billion won ($88.60 million) on the main board on Wednesday.

** The won was quoted at 1,295.4 per dollar on the onshore settlement platform, 0.07% lower than its previous close at 1,294.5.

** In offshore trading, the won was quoted at 1,295.5 per dollar, down 0.1% on the day, while in non-deliverable forward trading its one-month contract was quoted at 1,292.5.

** The KOSPI has risen 15.98% so far this year, and gained 8.3% in the previous 30 trading sessions.

** The won has lost 2.4% against the dollar so far this year.

** In money and debt markets, March futures on three-year treasury bonds fell 0.01 point to 105.17.

** The most liquid three-year Korean treasury bond yield rose by 0.6 basis points to 3.222%, while the benchmark 10-year yield rose by 1.7 basis points to 3.278%. ($1 = 1,295.7500 won) (Reporting by Cynthia Kim; Editing by Sonia Cheema)