Sumco's Average Salary Is 5,065 People's

Item ５【従業員の状況】, the state of employees, in the annual securities report of SUMCO CORPORATION for its 27th fiscal year, January 1 to December 31, 2025, filed on EDINET on March 26, 2026, runs from page 11 to page 12 of 140. Page 11 carries three tables — two for headcount and one for the indicators in (4) — and the union passage in (3); (4) continues on page 12. The second table prints the four figures a reader abroad usually asks for first: 5,065 employees, an average age of 42.7, an average length of service of 14.0 years, and an average annual salary of 6,411,907 円 — ¥6,411,907 (US$39,145) at ¥163.8 to the dollar. The heading over that table is (2) 提出会社の状況, the state of the filing company, and the heading is the answer to the question of whose numbers these are.

The filing company is 株式会社ＳＵＭＣＯ, the company listed under securities code 3436, whose English name in the EDINET code list is SUMCO CORPORATION. ３【事業の内容】, page 7, describes the group as 当社、連結子会社16社、非連結子会社３社、持分法適用関連会社１社 — the company, 16 consolidated subsidiaries, 3 non-consolidated subsidiaries and 1 equity-method associate — in a single segment, 高純度シリコン事業, making and selling silicon wafers for semiconductor makers. The same page lists where the wafers are made: 300mm at 佐賀県伊万里市, 佐賀県杵島郡江北町, 山形県米沢市, 長崎県大村市 and 台湾; 200mm and below at those four Japanese sites plus 北海道千歳市 and 宮崎県宮崎市, and in 米国, インドネシア and 台湾; polysilicon at 三重県四日市市 and in 米国. The parent's own 売上高 for 2025 was ¥334,368 million (US$2,041.3 million), in the 提出会社 indicator table on page 4; the group's consolidated 売上高 was ¥409,670 million (US$2,501.0 million), on page 2. The salary, age and tenure figures belong to the staff of the first of these two entities.

The first table on page 11, (1) 連結会社の状況, has one row. Above it the report says 当社グループの事業は「高純度シリコン」のみの単一セグメントであり、セグメント情報に関連付けては記載しておりません — the group's business is the single segment 高純度シリコン, so the headcount is not tied to segment information. The row reads セグメントの名称 高純度シリコン, 従業員数(人) 9,714 (769), as of December 31, 2025. The group's headcount in this item is therefore a single figure, with no split by company, region or product in the table itself; the places where some of those people work appear in a different section, read below.

The note under the consolidated table says what 従業員数 counts. 従業員数は就業人員(当社グループからグループ外部への出向者を除き、グループ外部から当社グループへの出向者を含むほか、常用パートを含む。)であり — the headcount is persons at work, excluding those seconded from the group to outside it, including those seconded into the group from outside, and including 常用パート, regular part-time staff. The temporary figure is defined in the same sentence: 臨時雇用者数(人材派遣会社からの派遣社員は含み、常用パートは除く。)は、年間の平均人員を( )に、外数で記載しております — temporary staff, including workers dispatched by staffing agencies and excluding regular part-timers, are shown in parentheses as an annual average and as 外数, a figure outside the main one. So 9,714 contains regular part-timers and incoming secondees, and does not contain the 769; the 769 is an average over the year, while the 9,714 is a count at the year-end.

The 提出会社 table is a single row under four headings: 従業員数(人) 5,065 (386), 平均年齢(才) 42.7, 平均勤続年数(年) 14.0, 平均年間給与(円) 6,411,907. Note 1 repeats the headcount definition at company level — secondees out of the company excluded, secondees into it included, regular part-timers included, dispatched staff in the parenthesised annual average. Note 2 is the sentence a reader of the salary column needs: 平均年間給与は、賞与及び基準外賃金を含んでおります — the average annual salary includes bonuses and 基準外賃金, pay outside the base wage. The column is headed in 円, so the printed figure is yen, not thousands of yen: ¥6,411,907 (US$39,145). The note says what the average includes; it does not break the figure down, and this piece reports it under its printed label.

Note 3 under the same table explains the 14.0 years. 当社は2002年２月６日付三菱マテリアルシリコン株式会社との合併により従業員を引き継いでおり、2003年１月１日付で住友金属工業株式会社(現 日本製鉄株式会社)及び三菱マテリアル株式会社からの出向者は全員が転籍しておりますが、平均勤続年数は両社からの通算で算出しております — the company took over employees in its merger with 三菱マテリアルシリコン株式会社 dated February 6, 2002; on January 1, 2003 all the staff seconded from 住友金属工業株式会社 (now 日本製鉄株式会社) and 三菱マテリアル株式会社 were transferred to it; and the average length of service is calculated by carrying over service at those two companies. The printed average can thus include years worked at the two former parents before the transfer. The 2024 report carries the same note.

The report for the 26th fiscal year, calendar 2024, filed on March 27, 2025, prints the same two tables on its own page 10 of 136. The group then counted 9,850 (953); the filing company 4,992 (500), with an average age of 42.6, an average tenure of 13.6 years and an average annual salary of 6,673,384 円 — ¥6,673,384 (US$40,741). Set side by side, the group's headcount went from 9,850 to 9,714 and its temporary average from 953 to 769; the parent's headcount went from 4,992 to 5,065, its temporary average from 500 to 386, its average age from 42.6 to 42.7, its average tenure from 13.6 to 14.0, and its printed average salary from ¥6,673,384 (US$40,741) to ¥6,411,907 (US$39,145). The notes printed under the two tables in both years are the three definitional ones quoted above; they define the figures and do not comment on the movements.

The 主要な経営指標等の推移 tables at the front of the 2025 report carry headcount for five year-ends. Consolidated, page 2: 8,469, 9,189, 9,847, 9,850 and 9,714 for December 2021 through December 2025, with the parenthesised 外、平均臨時雇用者数 at 1,011, 1,182, 1,113, 953 and 769. Filing company, page 4: 4,168, 4,622, 4,938, 4,992 and 5,065, with 584, 682, 620, 500 and 386. Read along the rows, the group figure rose at the first three steps and fell at the fourth; the parent's rose at each of the four steps; and both temporary averages fell at each of the last three steps. The chart below plots these twenty printed values.

The report names some of the places behind the 9,714 in ２【主要な設備の状況】, page 33, whose tables carry a 従業員数 column as of December 31, 2025. (1) 提出会社 has three rows: 九州事業所伊万里 (佐賀県伊万里市) 3,296 (257); 九州事業所佐賀 (佐賀県杵島郡江北町) 497 (23); 米沢工場 (山形県米沢市) 318 (12). (2) 国内子会社 has one: SUMCO TECHXIV株式会社, 本社・工場 (長崎県大村市), 1,043 (26). (3) 在外子会社 has one: FORMOSA SUMCO TECHNOLOGY CORPORATION, 本社・工場 (台湾雲林縣), 1,480 with a dash in the parentheses. Note 2 to the table: 従業員数欄の( )は、年間平均臨時従業員数を外数で記載しております. These are the rows of a table of principal facilities, each labelled 半導体用ウェーハ製造設備; the 5,065 is the company-wide figure, and this piece does not add the plant rows or assign the remainder. The same page of the 2024 report printed 3,174 (336), 527 (26) and 325 (21) for the three parent rows, 1,186 (87) for 大村 and 1,490 with a dash for 雲林.

４【関係会社の状況】, page 10, gives the weight of the subsidiaries whose staff fall under the consolidated row and not the filing-company row. SUMCO TECHXIV株式会社, 長崎県大村市, is 100 percent owned, with 半導体用シリコンウェーハの製造 as its business and 役員の兼任等 有 and 融資 有 in the relationship column. 高純度シリコン株式会社, 三重県四日市市, is 100 percent owned and makes and sells 半導体用多結晶シリコン等. FORMOSA SUMCO TECHNOLOGY CORPORATION, 台湾雲林縣, is listed with 議決権の所有割合又は被所有割合 of 43 percent, all of it indirect, with note 3 saying 持分は、100分の50以下でありますが、実質的に支配しているため子会社としております — the holding is 50 percent or less but the company is treated as a subsidiary because it is in substance controlled; note 4, which names the company as FORMOSA SUMCO TECHNOLOGY CORPORATION(連結), says its 売上高 on that consolidated basis, excluding sales between consolidated companies, exceeds 10 percent of the group's consolidated sales and prints it at ¥59,327 million (US$362.2 million). By the notes on page 11, the staff of these companies are counted in the consolidated row, while the filing-company row counts persons at work at 株式会社ＳＵＭＣＯ itself, incoming secondees included; the ¥6,411,907 (US$39,145) is printed in that second row.

(3) 労働組合の状況, page 11, names three unions and their membership. 当社及び一部グループ会社には、SUMCO労働組合(組合員数4,183人)が組織されております — at the company and some group companies the SUMCO労働組合 has 4,183 members. SUMCO TECHXIV ユニオン, organised mainly around the employees of SUMCO TECHXIV株式会社, has 1,819; 高純度シリコン労働組合, mainly around the employees of 高純度シリコン株式会社, has 124. All three belong to 日本基幹産業労働組合連合会, and the passage closes 労使関係は円満であり、特記すべき事項はありません. The 2024 report printed 4,219, 1,881 and 119. Membership counts are the unions' figures and are not the headcounts above; the report prints them in the same item without relating one to the other, and neither does this piece.

(4), on pages 11 and 12, carries the indicators required under the 女性活躍推進法 and the 育児・介護休業法. ① 提出会社, 当事業年度: 管理職に占める女性労働者の割合 2.6 percent; 男性労働者の育児休業取得率 100.0 percent; 労働者の男女の賃金の差異, women's pay as a percentage of men's, 72.1 for 全労働者, 72.8 for うち正規雇用労働者 and 69.8 for うちパート・有期従業員. Note 1 says the management ratio is computed 当社から社外への出向者を含め、社外から当社への出向者を除いて — including secondees out and excluding secondees in, the reverse of the headcount rule. Note 3 adds the company's own sentence on the pay gap: 管理職比率、労務構成など男女間に差異があることで１名当たり賃金に差が出ておりますが、人事体系、報酬制度、評価制度、人材育成などにおいて性別による処遇差はありません. The 2024 figures were 1.9, 99.3, 75.7, 75.7 and 88.7. ② 連結子会社, page 12, prints one company, SUMCO TECHXIV株式会社: 0.0, 93.8, 82.1, 83.8 and 58.0, against 6.7, 95.1, 80.6, 81.4 and 59.3 on page 11 of the 2024 report.

The sustainability section reads the workforce through targets. (3) 人的資本, pages 19 to 21, opens with the four lines of the ＳＵＭＣＯビジョン, one of them 従業員が活き活きとした利益マインドの高い会社, and names the SUMCO CEO AWARD, the on-site nursery SUMCOいまり保育園, the 退職者カムバック制度 for staff who left for childcare and the 健康経営優良法人ホワイト500 certification, ８年連続. The table ② 指標及び目標 on page 21 has three rows. 研修の充実: the KPI is 人事部門主催の全社教育延べ受講時間, the target 前年度以上, the 2025 result 31,451時間 against 29,228時間 in 2024, with note 1 saying the figure is 提出会社ベース. 女性活躍推進: 女性管理職比率, target for 2030年 単体 10％ and 連結 12％, results 単体 2.6％ and 連結 8.8％ for 2025, 単体 1.9％ and 連結 7.5％ for 2024 — the 単体 figures are the ones printed in (4) ①. 健康経営: ERI調整後総合健康リスク, target 100以下の維持, results 90 and 87, note 3 saying the figure is 国内連結子会社ベース. Across the three rows, the training hours are reported on a 提出会社 basis under note 1, the 女性管理職比率 is printed separately as 単体 and 連結 in the table, and the health risk is reported on a 国内連結子会社 basis under note 3; note 2 states the statutory basis on which the 女性管理職比率 is calculated.

Two other passages touch the people counted at SUMCO TECHXIV. The notes to the consolidated income statement, ※５ 特別損失の内容 on page 89, describe for the previous fiscal year, 2024, a 事業構造改善費用: 200mm以下の小径シリコンウェーハ生産体制再編により、連結子会社であるSUMCO TECHXIV株式会社 宮崎工場におけるウェーハ生産の終了を決定したため — because of a reorganisation of production of wafers of 200mm and below, the decision was taken to end wafer production at SUMCO TECHXIV's 宮崎工場 — with an impairment loss of ¥4,624 million (US$28.2 million) and a further ¥1,189 million (US$7.3 million) of reorganisation losses; for 2025 the same note reads 該当事項はありません. Page 28 says of 200mm and below that 生産体制の見直しを進め, the production set-up was being reviewed. The facilities table's SUMCO TECHXIV row is the 大村 plant, 1,186 (87) in 2024 and 1,043 (26) in 2025; the report does not relate that row to the 宮崎 passage in the pages read, and this piece places the two side by side without drawing a line between them. In ３【事業等のリスク】, page 27, the enumerated events that could affect results include ④ 当社グループの事業に必要な人材を確保できない場合 — the case in which the group cannot secure the people its business needs.

This desk retrieved both reports as PDFs through the EDINET document API — S100XRR5 for 2025 and S100VFYA for 2024 — and read the 従業員の状況 tables on page 11 and page 10 with pdfplumber's table extraction, keeping the whitespace so that cells stayed apart; the five-year headcounts were checked against the indicator tables on pages 2 and 4, and the plant rows against page 33 of each report. Page numbers are those printed on the PDF pages, in the form N/140 and N/136. The English name SUMCO CORPORATION is the 提出者名（英字） in the EDINET code list. Yen are converted at ¥163.8 = US$1 for reference. No other figure is computed: the plant rows are not added, no year is differenced, no ratio is taken, and no group-wide salary is derived, because the reports print none in the pages read.