Here are Sri Lankan life insurers that publicly offer participating/"with‑profits" products and regularly declare policyholder bonuses/dividends (most insurers use the terms “bonus”, “reversionary/terminal bonus” or — less commonly — “dividend”):

• Sri Lanka Insurance Life (SLIC) — large, regular life‑policy bonus declarations (SLIC has repeatedly announced industry‑leading bonuses). (ceylontoday.lk)
• Ceylinco Life — publishes annual bonus payments / reversionary & terminal bonuses for with‑profit policies. (islandback.lankapanel.net)
• AIA Sri Lanka — operates a dividend system for certain life products (AIA calls them “dividends” and explains how eligible policyholders receive them). (aialife.com.lk)
• Softlogic Life (including Allianz Life Lanka business, now part of Softlogic) — offers endowment/with‑profits plans that accumulate reversionary bonuses. (softlogiclife.lk)
• Janashakthi Life — markets savings/participating products that pay dividends/guaranteed rates on eligible plans. (enbsl.lk)

Notes and tips

• What “counts”: Only participating or “with‑profits” (sometimes called “PAR” or shown in the policy schedule) policies take part in the insurer’s surplus and are eligible for bonuses/dividends. Non‑participating or unit‑linked products usually do not. (See how insurers describe participating/bonus arrangements.) (businesstoday.in)
• How insurers pay: bonuses may be reversionary (added to the sum assured annually and payable at maturity/death), terminal/cash bonuses (paid on exit), or annual dividends (as AIA describes). Eligibility and exact amounts vary by product and year. (islandback.lankapanel.net)
• For any specific policy: check the insurer’s latest “bonus declaration” / annual report / product brochure or your policy schedule (it will show whether the plan is participating and how bonuses/dividends are handled). If you want, I can look up the most recent bonus declaration or current bonus/dividend rates for any one insurer above.