MBOIX — Madison Core Bond Fund
Data updated: 2026-06-23
MBOIX — Madison Core Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $225.33M AUM · 0.36% expense ratio · 4.4% 1-yr return. From SEC regulatory filings.
MBOIX Fund Overview
MBOIX — Madison Core Bond Fund is a US mutual fund managed by Madison Funds, categorised as Long Total / Aggregate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Madison Funds
- Category: Long Total / Aggregate Bond
- Assets under management: $225.33M
- 1-year return: 4.4%
- Ticker: MBOIX
- SEC CIK: 0001040612
- SEC series ID: S000020646
- Share class ID: C000227346
MBOIX Holdings
Top 10 holdings of Madison Core Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| United States Treasury | 2.48% |
| United States Treasury | 2.44% |
| United States Treasury | 2.24% |
| United States Treasury | 2.01% |
| United States Treasury | 1.89% |
| United States Treasury | 1.77% |
| United States Treasury | 1.77% |
| United States Treasury | 1.74% |
| United States Treasury | 1.71% |
| United States Treasury | 1.67% |
MBOIX Portfolio Allocation
Asset-class allocation of Madison Core Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 55.5% |
| Securitized | 43.0% |
| Cash & Equivalents | 2.1% |
MBOIX Performance
Total returns for MBOIX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.1% |
| 1 year | 4.4% |
| 3 years (annualised) | 3.8% |
| 5 years (annualised) | 0.4% |
MBOIX Risk Information
Risk metrics for MBOIX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.4%
MBOIX Costs and Fees
MBOIX costs about $36 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.36%
- Gross expense ratio: 0.36%
- Portfolio turnover: 10%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
MBOIX Cashflows
Over the 12 months to 2026-04, Madison Core Bond Fund had net inflows of $23.36M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-04 | −$402.18K |
| 2026-03 | −$1.60M |
| 2026-02 | $5.53M |
| 2026-01 | −$216.24K |
| 2025-12 | $1.95M |
| 2025-11 | $1.06M |
MBOIX Debt Constituents
Largest debt holdings of Madison Core Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury | 2.48% |
| United States Treasury | 2.44% |
| United States Treasury | 2.24% |
| United States Treasury | 2.01% |
| United States Treasury | 1.89% |
| United States Treasury | 1.77% |
| United States Treasury | 1.77% |
| United States Treasury | 1.74% |
| United States Treasury | 1.71% |
| United States Treasury | 1.67% |
MBOIX Prospectus and SEC Filings
Official Madison Core Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long Total / Aggregate Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.