OWMBX — Old Westbury Municipal Bond Fund
Data updated: 2026-06-26
OWMBX — Old Westbury Municipal Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Intermediate Municipal - National Bond · $4.54B AUM · 0.57% expense ratio · 4.4% 1-yr return. From SEC regulatory filings.
OWMBX Fund Overview
OWMBX — Old Westbury Municipal Bond Fund is a US mutual fund managed by Old Westbury Funds INC, categorised as Intermediate Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Old Westbury Funds INC
- Category: Intermediate Municipal - National Bond
- Assets under management: $4.54B
- 1-year return: 4.4%
- Ticker: OWMBX
- SEC CIK: 0000909994
- SEC series ID: S000001861
- Share class ID: C000004838
OWMBX Holdings
Top 10 holdings of Old Westbury Municipal Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Federated Hermes Money Market Obligations Trust | 2.80% |
| Denver (co), City And County Of | 0.64% |
| Brookhaven Ga Dev Auth | 0.59% |
| Washington St | 0.59% |
| New York N Y | 0.55% |
| Washington St | 0.50% |
| New Hampshire Health And Educational Facilities Authority (nh) | 0.50% |
| New York State Urban Development Corp. (ny) | 0.49% |
| Washington St | 0.49% |
| New Jersey Educational Facilities Authority (nj) | 0.47% |
OWMBX Portfolio Allocation
Asset-class allocation of Old Westbury Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 97.3% |
| Cash & Equivalents | 2.8% |
OWMBX Performance
Total returns for OWMBX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.1% |
| 1 year | 4.4% |
| 3 years (annualised) | 2.4% |
| 5 years (annualised) | 0.6% |
OWMBX Risk Information
Risk metrics for OWMBX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 2.9%
OWMBX Costs and Fees
OWMBX costs about $57 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.57%
- Gross expense ratio: 0.65%
- Portfolio turnover: 52%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
OWMBX Cashflows
Over the 12 months to 2026-04, Old Westbury Municipal Bond Fund had net inflows of $301.57M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-04 | $27.47M |
| 2026-03 | $38.97M |
| 2026-02 | $48.22M |
| 2026-01 | $91.00M |
| 2025-12 | $45.26M |
| 2025-11 | −$9.17M |
OWMBX Debt Constituents
Largest debt holdings of Old Westbury Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Denver (co), City And County Of | 0.64% |
| Brookhaven Ga Dev Auth | 0.59% |
| Washington St | 0.59% |
| New York N Y | 0.55% |
| Washington St | 0.50% |
| New Hampshire Health And Educational Facilities Authority (nh) | 0.50% |
| New York State Urban Development Corp. (ny) | 0.49% |
| Washington St | 0.49% |
| New Jersey Educational Facilities Authority (nj) | 0.47% |
| Maryland (md), State Of | 0.46% |
OWMBX Prospectus and SEC Filings
Official Old Westbury Municipal Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Intermediate Municipal - National 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.