MTBA additions & removals
Changes are observation-bounded: an addition is the first retained official snapshot containing a security after an earlier absence; a removal is its first retained absence. Baseline holdings receive no invented addition date.
Additions
| Ticker | Issuer | Observed date | Change |
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| DTRXX | DREYFUS TRSY OBLIG CASH M | 2026-03-31 | Added / first present |
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| Federal National Mortgage Association | Federal National Mortgage Association | 2026-03-31 | Added / first present |
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| Federal National Mortgage Association | Federal National Mortgage Association | 2026-03-31 | Added / first present |
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| Federal National Mortgage Association | Federal National Mortgage Association | 2026-03-31 | Added / first present |
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| United States Treasury Bills | United States Treasury Bills | 2026-03-31 | Added / first present |
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| United States Treasury Bills | United States Treasury Bills | 2026-03-31 | Added / first present |
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| United States Treasury Bills | United States Treasury Bills | 2026-03-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-12-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-12-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-12-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-12-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-12-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-12-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-09-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-09-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-09-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Added / first present |
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| SBIL | Simplify Government Money Market ETF | 2025-09-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-06-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-06-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-06-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-03-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-03-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-03-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-03-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-03-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-03-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-03-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2025-03-31 | Added / first present |
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| FIDELITY INV MMTRSY 1 680 | FIDELITY INV MMTRSY 1 680 | 2024-12-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-12-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-12-31 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2024-12-31 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Added / first present |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Added / first present |
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| WI TREASURY BILL | WI TREASURY BILL | 2024-09-30 | Added / first present |
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| TREASURY BILL | TREASURY BILL | 2024-09-30 | Added / first present |
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Removals
| Ticker | Issuer | Observed date | Change |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2026-03-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2026-03-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2026-03-31 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2026-03-31 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2026-03-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-12-31 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-12-31 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-09-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-09-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-06-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-06-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-06-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-06-30 | Removed / first absent |
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| FIDELITY INV MMTRSY 1 680 | FIDELITY INV MMTRSY 1 680 | 2026-03-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-03-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2025-03-31 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2025-03-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-12-31 | Removed / first absent |
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| WI TREASURY BILL | WI TREASURY BILL | 2024-12-31 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2024-12-31 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Removed / first absent |
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| Fannie Mae or Freddie Mac | Fannie Mae or Freddie Mac | 2024-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2024-09-30 | Removed / first absent |
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| TREASURY BILL | TREASURY BILL | 2024-09-30 | Removed / first absent |
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