MUBWX — Unconstrained Bond Series
Data updated: 2026-08-21
MUBWX — Unconstrained Bond Series. Long Securitized (MBS/ABS/CMBS) Bond · $768.32M AUM · 0.06% expense ratio. Holdings, fees, performance and SEC filings.
MUBWX Fund Overview
MUBWX — Unconstrained Bond Series is a US mutual fund managed by Manning & Napier Fund, Inc., categorised as Long Securitized (MBS/ABS/CMBS) Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Manning & Napier Fund, Inc.
- Category: Long Securitized (MBS/ABS/CMBS) Bond
- Assets under management: $768.32M
- 1-year return: 3.9%
- Ticker: MUBWX
- SEC CIK: 0000751173
- SEC series ID: S000003632
- Share class ID: C000206448
MUBWX Holdings
Top 10 holdings of Unconstrained Bond Series by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| United States Of America - Bureau Of The Public Debt | 6.02% |
| United States Of America - Bureau Of The Public Debt | 5.11% |
| United States Of America - Bureau Of The Public Debt | 4.39% |
| United States Of America - Bureau Of The Public Debt | 4.10% |
| Dreyfus Government Cash Management Funds | 3.17% |
| Vaneck ETF Trust | 2.11% |
| United States Of America - Bureau Of The Public Debt | 1.16% |
| Alexander Funding Trust Ii | 1.12% |
| Bourzou Issuer LLC | 1.07% |
| Slm Student Loan Trust 2012-7 | 0.98% |
MUBWX Portfolio Allocation
Asset-class allocation of Unconstrained Bond Series by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Securitized | 53.7% |
| Fixed Income | 39.0% |
| Cash & Equivalents | 3.2% |
| Equity | 2.2% |
| Loans | 1.1% |
MUBWX Performance
Total returns for MUBWX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.2% |
| 1 year | 3.9% |
| 3 years (annualised) | 5.9% |
| 5 years (annualised) | 2.7% |
MUBWX Risk Information
Risk metrics for MUBWX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 2.0%
MUBWX Costs and Fees
MUBWX costs about $6 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.06%
- Gross expense ratio: 0.39%
- Portfolio turnover: 53%
- Brokerage commissions: 0.34 bps of average net assets (SEC N-CEN)
MUBWX Cashflows
Over the 12 months to 2026-06, Unconstrained Bond Series had net outflows of $53.73M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$5.88M |
| 2026-05 | −$3.24M |
| 2026-04 | −$16.75M |
| 2026-03 | −$382.11K |
| 2026-02 | $813.22K |
| 2026-01 | $10.37M |
MUBWX Debt Constituents
Largest debt holdings of Unconstrained Bond Series by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Of America - Bureau Of The Public Debt | 6.02% |
| United States Of America - Bureau Of The Public Debt | 5.11% |
| United States Of America - Bureau Of The Public Debt | 4.39% |
| United States Of America - Bureau Of The Public Debt | 4.10% |
| United States Of America - Bureau Of The Public Debt | 1.16% |
| Alexander Funding Trust Ii | 1.12% |
| International Seaways, Inc. | 0.66% |
| Contships Logistics Corp | 0.61% |
| Eagle Funding Luxco Sarl | 0.60% |
| Slm Corp. (sallie Mae) | 0.57% |
MUBWX Prospectus and SEC Filings
Official Unconstrained Bond Series filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-03-13
- Prospectus (485BPOS) — filed 2025-02-27
- Prospectus (485BPOS) — filed 2024-02-28
- Portfolio holdings (N-PORT) — filed 2026-08-21
- Portfolio holdings (N-PORT) — filed 2026-05-28
- Portfolio holdings (N-PORT) — filed 2026-02-23
- Annual census (N-CEN) — filed 2026-03-05
- Annual census (N-CEN) — filed 2025-03-11
Related Funds
Other Long Securitized (MBS/ABS/CMBS) 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.