| Futures Contracts | |||||
| Description | Number of Contracts | Position | Expiration Date | Notional Amount | Value/Unrealized Appreciation (Depreciation) |
| Interest Rate Futures | |||||
| U.S. 10-Year Treasury Note | (175) | Short | 6/21/22 | $(20,852,344) | $1,262,952 |
| U.S. Long Treasury Bond | (112) | Short | 6/21/22 | (15,756,999) | 1,496,040 |
| $2,758,992 | |||||
| Abbreviations: | |
| AGC | – Assured Guaranty Corp. |
| AGM | – Assured Guaranty Municipal Corp. |
| AMBAC | – AMBAC Financial Group, Inc. |
| AMT | – Interest earned from these securities may be considered a tax preference item for purposes of the Federal Alternative Minimum Tax. |
| BAM | – Build America Mutual Assurance Co. |
| LOC | – Letter of Credit |
| NPFG | – National Public Finance Guarantee Corp. |
| SPA | – Standby Bond Purchase Agreement |
| • | Level 1 – quoted prices in active markets for identical investments |
| • | Level 2 – other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.) |
| • | Level 3 – significant unobservable inputs (including a fund's own assumptions in determining the fair value of investments) |
| Asset Description | Level 1 | Level 2 | Level 3 | Total |
| Corporate Bonds | $ — | $ 38,206,400 | $ — | $ 38,206,400 |
| Tax-Exempt Municipal Obligations | — | 1,283,713,329 | — | 1,283,713,329 |
| Taxable Municipal Obligations | — | 76,960,661 | — | 76,960,661 |
| Total Investments | $ — | $1,398,880,390 | $ — | $1,398,880,390 |
| Futures Contracts | $2,758,992 | $ — | $ — | $ 2,758,992 |
| Total | $2,758,992 | $1,398,880,390 | $ — | $1,401,639,382 |