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Taiwan Steel Union Co., Ltd. — Investor Relations & Filings

Ticker · 6581 TW Water supply; sewerage, waste management and remediation activities
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Filings indexed 30 across all filing types
Latest filing 2026-04-08 Earnings Release
Country TW Taiwan
Listing TW 6581

About Taiwan Steel Union Co., Ltd.

https://www.tsutw.com.tw/

Taiwan Steel Union Co., Ltd. (TSU) is a resource recycling enterprise dedicated to the circular economy through "urban mining" and advanced smelting technologies. The company specializes in the treatment of electric arc furnace (EAF) dust and various zinc-containing industrial wastes. Utilizing high-temperature Waelz kiln processes and waste heat recovery, TSU transforms hazardous by-products into valuable resources, primarily crude zinc oxide. It holds the distinction of being the first hazardous waste recycling organization to obtain UL2809 verification for recycled material content. Beyond zinc recovery, the company has expanded its capabilities to process diverse industrial waste streams, converting them into renewable construction materials. With over three decades of operational expertise, TSU provides technical solutions that address waste disposal challenges while promoting resource sustainability and carbon emission reduction.

Recent filings

Filing Released Lang Actions
公告115年3月份合併自結損益
Earnings Release Classification · 1% confidence The document is a corporate disclosure from a listed Taiwan company announcing its March consolidated self-calculated profit and loss figures, including single-month and year-to-date revenue and P/L metrics. It provides key high-level results (unreviewed by auditors) rather than a full interim report. This aligns with an initial announcement of periodic financial results (an earnings release), so it matches the ER category. Q1 2026
2026-04-08 Chinese
115年3月背書保證與資金貸與
Regulatory Filings Classification · 1% confidence The document is a short mandatory monthly disclosure of the company’s funding loans and guarantee/endorsement balances (including intra‐group and China region), published on Taiwan’s Market Observation Post System. It is not an earnings release, capital change, or an annual/interim report but rather a routine regulatory update. Thus it falls under the generic “Regulatory Filings” category (RNS).
2026-04-08 Chinese
115年3月營業收入
Earnings Release Classification · 1% confidence The document is a monthly revenue summary (net operating income for the month and year‐to‐date) provided directly in tabular form with year‐over‐year comparisons and brief notes. It is not a full quarterly or interim report, nor is it announcing the publication of a longer document—it simply states key financial figures. This aligns with an “Earnings Release” (ER) style communication, which delivers periodical financial highlights only. Q1 2026
2026-04-08 Chinese
115年03月內部人持股異動(事後)
Director's Dealing Classification · 1% confidence The document is a detailed disclosure of shareholdings and monthly changes for insiders (chairman, directors, managers, independent directors) provided to the public information observatory. It lists identity, share class, holdings at appointment, increases and decreases during the period, and current balances. This aligns with “Director’s Dealing” filings (insider share transactions and holdings) rather than a general regulatory announcement or other report type. Therefore, the appropriate classification is DIRS.
2026-04-08 Chinese
115年03月董事會成員及持股
Director's Dealing Classification · 1% confidence The document is a periodic insider shareholding disclosure from Taiwan’s Market Observation Post System, detailing current holdings and pledged shares of directors, officers, and major shareholders. This matches the “Director’s Dealing” category, which covers filings reporting personal shareholdings and transactions by directors and executives. It is not an annual or quarterly report, but a regulatory insider transaction/holdings disclosure.
2026-04-08 Chinese
114年第4季財務報告書 — 202504_6581_AIC.pdf
Audit Report / Information Classification · 1% confidence The document is titled “Independent Auditors’ Report” and includes the auditor’s opinion, basis for opinion, key audit matters, auditors’ responsibilities, and full audited financial statements (balance sheets, statements of comprehensive income, notes, etc.) for the years ended December 31, 2025 and 2024. It is not a full corporate Annual Report (10-K) but a standalone audit report with accompanying financial statements. This matches the definition of Audit Report / Information (AR). FY 2025
2026-03-30 English

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