Monitor UMC's share price relative to the conversion price thresholds (NT$202.06 and NT$179.19). If the stock trades above 130% of these for 20/30 consecutive trading days, the company can force conversion, accelerating dilution. The 18-month Tranche B maturity creates near-term overhang.
Price Chart
Executive Summary
UMC priced a US$1.8 billion zero-coupon convertible bond offering (Tranche A: US$900M, 5yr maturity, -0.25% yield; Tranche B: US$900M, 18-month maturity, -1.35% yield). Proceeds will fund machinery/equipment and plant construction. Full conversion would dilute existing shareholders by ~2.34%. The negative yields imply investors are paying a premium for the conversion option, reflecting confidence in UMC's equity upside.
Key Facts
- Issued US$1.8 billion in 7th Unsecured Overseas Convertible Bonds (US$900M Tranche A, US$900M Tranche B).
- Coupon rate: 0% per annum on both tranches.
- Tranche A matures 2031/10/13 (5yr); Tranche B matures 2028/04/13 (18 months).
- Initial conversion price: Tranche A at NT$202.06/share (132.5% of NT$152.50 close); Tranche B at NT$179.19/share (117.5% of NT$152.50 close).
- Full conversion dilution: approximately 2.34% of existing shareholders' equity.
- Proceeds used for machinery/equipment and plant facilities.
- Negative redemption yields: Tranche A -0.25% p.a.; Tranche B -1.35% p.a.
- Bondholders can put Tranche A on 2027/10/13 and 2029/10/13 at -0.25% yield.
Financial Impact
US$1.8 billion convertible bond issuance with 2.34% potential dilution
Risk Factors
- Potential equity dilution of ~2.34% upon full conversion.
- Negative yields indicate investors are paying for optionality, not credit — if UMC stock underperforms, bonds may trade at a discount, pressuring the stock.
- Large debt issuance (US$1.8B) increases leverage and interest cost exposure.
Investment Themes
Documents Analyzed
This report is based on 5 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| 6-K Filing (Primary) | 0001193125-26-413371 |
| Document: 6k_on_10052026.htm | 0001193125-26-413371 |
| Document: 0001193125-26-413371-index-headers.html | 0001193125-26-413371 |
| Document: 0001193125-26-413371-index.html | 0001193125-26-413371 |
| Document: 0001193125-26-413371.txt | 0001193125-26-413371 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 23, 2026 4d ago | 6-K | $18.89 | awaiting T+5 | — | $19.00 (+0.60%) |
Oct 13, 2026 14d ago | 6-K | $22.39 $19.67 | ▼ −12.15% | ▼ −11.00% | $19.00 (−15.13%) |
Oct 7, 2026 20d ago | Court Ruling | $22.82 $20.92 | ▼ −8.33% | ▼ −8.05% | $19.00 (−16.73%) |
Oct 6, 2026 21d ago | 6-K | $23.19 $22.39 | ▼ −3.45% | ▼ −3.31% | $19.00 (−18.06%) |
Oct 5, 2026 22d ago | 6-K | $23.92 $22.55 | ▲ +5.73% | ▲ +6.15% | $19.00 (+20.56%) |
Sep 29, 2026 28d ago | 6-K | $24.72 $23.19 | ▼ −6.19% | ▼ −8.14% | $19.00 (−23.13%) |
Sep 22, 2026 5w ago | Insider Cluster | $25.77 $24.72 | ▲ +4.07% | ▲ +2.89% | $19.00 (+26.26%) |
Sep 4, 2026 7w ago | 6-K | $20.77 $21.90 | ▲ +5.44% | ▲ +6.65% | $19.00 (−8.51%) |
Sep 2, 2026 7w ago | 6-K | $19.97 $22.12 | ▲ +10.77% | ▲ +11.72% | $19.00 (−4.84%) |
Aug 26, 2026 8w ago | 6-K | $19.03 $19.97 | ▼ −4.94% | ▼ −5.06% | $19.00 (+0.14%) |
US Market Status
Subscribe to SecBot
Get Real-Time SEC Filing Intelligence
Comprehensive SEC filing analysis delivered the moment filings hit EDGAR. Sentiment scoring, impact analysis, and actionable insights for every material event.
Create a free account Live analysis, Telegram alerts, watchlists and the MCP server for subscribers