Monitor for any future conversion of this 13G to a 13D or for additional accumulation by Calamos, which would signal a shift from passive to activist intent. The presence of multiple passive filers (AQR, Barclays, W.R. Berkley) suggests broad institutional interest in SilverBox Corp IV ahead of a potential de-SPAC transaction.
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Executive Summary
Calamos Investment Trust disclosed a 7.8% passive stake in SilverBox Corp IV via a Schedule 13G filing, representing 500,000 Class A shares held by the Calamos Market Neutral Income Fund as of September 30, 2026. This is a new passive position in a blank-check company, indicating no intent to influence management.
Key Financial Metrics
Key Facts
- Calamos Investment Trust filed a new Schedule 13G disclosing beneficial ownership of 500,000 Class A shares of SilverBox Corp IV.
- The stake represents 7.8% of the outstanding Class A shares as of September 30, 2026.
- The filing is passive (Rule 13d-1(d)), with no intent to influence or change control at the issuer.
- SilverBox Corp IV is a blank-check company (SIC 6770) that has attracted multiple passive filers: AQR Capital Management, Barclays PLC, and W.R. Berkley Corp have previously filed 13G/A or 13G forms.
Financial Impact
7.8% passive stake in a SPAC; no dollar value disclosed in the filing.
Risk Factors
- Passive 13G filers may convert to activist 13D if they seek to influence a de-SPAC deal terms or liquidation.
- SPACs face inherent risk of failing to complete a business combination within the required timeframe.
- Multiple large passive holders could complicate any future vote or tender process.
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G Filing (Primary) | 0001104659-26-114884 |
| Document: 0001104659-26-114884-index.html | 0001104659-26-114884 |
| Document: 0001104659-26-114884.txt | 0001104659-26-114884 |
Track record builds as more directional reports settle.
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 9, 2026 17d ago | SC 13G | — | awaiting T+5 | — | — |
Sep 25, 2026 4w ago | 8-K | $11.39 $10.76 | ▲ +5.53% | ▲ +6.74% | — |
Aug 5, 2026 11w ago | 8-K | $10.86 $10.82 | ▼ −0.32% | ▼ −0.67% | — |
Jul 31, 2026 12w ago | DEFA14A | $10.85 $10.83 | ▼ −0.23% | ▼ −2.26% | — |
US Market Status
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