Samsung SDI's largest shareholder affiliate Samsung Life Insurance (special account) acquired 3,421 common shares and 155 preferred shares between September 1 and 8, increasing its stake from 19.82% to 19.83%.

Samsung Life Insurance (special account), a largest shareholder affiliate of Samsung SDI, acquired 3,421 common shares and 155 preferred shares through on-market trading from September 1, 2026 through 8. As a result, Samsung Life Insurance (special account)'s holdings increased from 16,293,664 shares (19.82%) to 16,297,240 shares (19.83%), and the largest shareholder affiliate group's stake rose by 0.01%.

1. 01

   Samsung Life Insurance (special account), a largest shareholder affiliate, acquired 3,421 common shares and 155 preferred shares through on-market trading from September 1, 2026 through 8.

2. 02

   The largest shareholder Samsung Electronics holds 15,663,968 common shares (19.44%), and Samsung Life Insurance (special account) holds 59,840 common shares and 947 preferred shares.

3. 03

   Samsung SDI's largest shareholder and affiliate group as a whole holds 16,296,293 common shares (20.22%), 947 preferred shares (0.06%), and 16,297,240 shares in total (19.83%).

4. 04

   The reporting period runs from the previous report as of September 8, 2026 to this report as of October 8, 2026, with detailed changes reflecting trading transactions from September 1 through 8.

An AI model translated the Korean summary of this filing into English; every number is carried over from the Korean original. Reference information, not investment advice.

Key figures

Common shares acquired

3,421 shares

Preferred shares acquired

155 shares

Stake (previous report)

19.82%

Stake (this report)

19.83%

Change in stake

0.01%

Filing facts

Filing type

Largest Shareholder Holding Change

Report name

Report on Changes in Shares Held by the Largest Shareholder and Related Parties

Filed

Oct 8, 2026

Receipt number

20261008800289