Disclosures

Non-registered executive Kim Hyun-jung (IR organization, TL position) reported acquiring 31 common shares through four open-market purchases between May 18 and June 1, 2026, raising his holding from 0 to 31 shares. The trades were executed at prices ranging from KRW 1,769,000 to KRW 2,260,158 per share, with an average purchase price of approximately KRW 2,122,935. Total ownership remains effectively 0.00% of the 712,702,365 shares outstanding, so the filing has no governance or float implications. The disclosure is notable mainly as an insider-sentiment signal: an IR-side executive added to his personal stake during a period of sharply rising share prices.

Capital Research and Management Company, a major US institutional investor, filed an abbreviated large-shareholding report disclosing that its combined holding (with five affiliated Capital Group entities) fell to 25,149,374 shares (3.53%) from 36,730,947 shares (5.05%). The 1.52 percentage-point reduction — roughly 11.58 million shares — was executed through on-market and off-market sales for the stated purpose of recovering investment capital. The holding purpose remains classified as 'simple investment,' not management influence. Because the stake has dropped below the 5% reporting threshold, this may be the filer's final mandatory disclosure absent future buying. The sale by a long-term foreign institutional holder of this size can weigh on near-term sentiment, particularly given SK Hynix's heavy foreign ownership base.

A non-registered executive (Research Fellow Joo Young-pyo, appointed January 1, 2026) filed an insider ownership change report. His holdings rose from 296 to 600 common shares (+304 shares), driven by two June 1, 2026 events: 259 shares withdrawn from his ESOP (employee stock ownership association) account to a personal account, plus an on-market purchase of 45 shares at KRW 2,391,000 per share. The total stake remains a negligible 0.00% of the 712,702,365 outstanding shares. This is a routine micro-level insider filing with no material signaling value.

Non-registered executive (President) Kim Ju-seon reported an open-market sale of 1,000 common shares on May 29, 2026 at KRW 2,328,500 per share, reducing his holdings from 3,881 to 2,881 shares. The transaction value is approximately KRW 2.33 billion. His ownership ratio remains effectively 0.00% of the 712,702,365 total shares outstanding, so the sale has no governance implications. The filing is a routine insider ownership change report to the FSC and KRX.

Non-registered executive Choi Jun-ki exercised stock options on June 5, 2026, acquiring 2,205 common shares at an exercise price of KRW 124,220 per share. His total holdings rose from 2,000 to 4,205 shares (still effectively 0.00% of the 712,702,365 shares outstanding). The transaction is a routine option exercise rather than an open-market purchase, so it carries no directional signal on management's view of the share price. Given the negligible size relative to total shares outstanding, market impact is expected to be minimal.

Dongjin Holdings, the largest shareholder, filed an amended major shareholding report reflecting a change in its share pledge contract. The shares pledged under key contracts decreased from 1,096,651 (2.13%) to 878,159 (1.72%), while the total holding of 17,757,724 shares remained unchanged. The ownership ratio rose slightly from 34.54% to 34.84% due to a reduction in total voting shares from treasury stock cancellation. The number of special-related parties decreased from 4 to 3. No actual share transactions occurred; the filing reflects only a pledge contract modification.

Individual investor Park Young-ok, CEO of Smart Income Co., reported increasing his combined stake (including specially-related party Smart Income) in the company from 6.22% to 6.69% as of June 8, 2026. The holdings rose by 68,951 shares to 969,339 shares, all acquired through open-market purchases. The filing is classified as 'simple investment' purpose, not for management control influence. Detailed transaction records show consistent accumulation between late March and early June 2026 at prices ranging from roughly KRW 6,300 to KRW 7,690 per share. Park Young-ok is a well-known value investor in Korea, and his continued buying signals confidence in the company at current price levels.

The company secured a KRW 44.2 billion order from SK Hynix for its 'TC BONDER 4.5 GRIFFIN' equipment used in HBM4 manufacturing. The contract size represents 7.66% of 2025 consolidated revenue, a meaningful single-order win. Delivery is scheduled between June 8, 2026 and September 2, 2026, though the end date may shift based on customer coordination. No down payment is involved, and the amount excludes VAT. This reinforces the company's position as a key TC bonder supplier for SK Hynix's HBM4 ramp.

Samsung Life Insurance's special account reported a net decrease of 32,729 shares in its Samsung Electronics holdings between May 8 and June 8, 2026, comprising a 40,179-share reduction in common stock partially offset by a 7,450-share increase in preferred stock. The activity reflects routine in-market trading by the special account rather than a strategic stake change, with the largest shareholder group's combined ownership ratio unchanged at 17.33%. Samsung Life's principal account still holds 8.51% of common shares, with affiliates Samsung C&T (5.11%) and Samsung Fire & Marine (1.49%) rounding out the major insider holdings. This is a standard monthly regulatory filing capturing routine portfolio rebalancing within an insurer's special account, not a directional signal on the stock.