# Portfolio overlap — VBTLX vs IUSB Comparing **VANGUARD TOTAL BOND MARKET INDEX FUND** (2026-03-31) and **iShares Core Universal USD Bond ETF** (2026-01-31). - Shared positions: 8758 - VANGUARD TOTAL BOND MARKET INDEX FUND covered by iShares Core Universal USD Bond ETF: 0.5558975539614412729033688610 - iShares Core Universal USD Bond ETF covered by VANGUARD TOTAL BOND MARKET INDEX FUND: 0.5558975539614412729033688608 ## VANGUARD TOTAL BOND MARKET INDEX FUND — top positions | Security | Weight | Shared | |----------|--------|--------| | Vanguard Market Liquidity Fund | 0.010685 | | | US TREASURY N/B | 0.004799 | ✓ | | US TREASURY N/B | 0.004211 | ✓ | | US TREASURY N/B | 0.004208 | ✓ | | US TREASURY N/B | 0.004193 | ✓ | | US TREASURY N/B | 0.004153 | ✓ | | US TREASURY N/B | 0.004130 | ✓ | | US TREASURY N/B | 0.004051 | ✓ | | US TREASURY N/B | 0.003950 | ✓ | | US TREASURY N/B | 0.003933 | ✓ | | US TREASURY N/B | 0.003650 | ✓ | | US TREASURY N/B | 0.003636 | ✓ | | US TREASURY N/B | 0.003633 | ✓ | | US TREASURY N/B | 0.003529 | ✓ | | US TREASURY N/B | 0.003528 | ✓ | | US TREASURY N/B | 0.003509 | ✓ | | US TREASURY N/B | 0.003423 | ✓ | | US TREASURY N/B | 0.003304 | ✓ | | US TREASURY N/B | 0.003245 | ✓ | | US TREASURY N/B | 0.003239 | ✓ | | US TREASURY N/B | 0.003235 | ✓ | | US TREASURY N/B | 0.003207 | ✓ | | US TREASURY N/B | 0.003188 | ✓ | | US TREASURY N/B | 0.003167 | ✓ | | US TREASURY N/B | 0.003117 | ✓ | | US TREASURY N/B | 0.003086 | ✓ | | US TREASURY N/B | 0.002885 | ✓ | | US TREASURY N/B | 0.002751 | ✓ | | US TREASURY N/B | 0.002746 | ✓ | | US TREASURY N/B | 0.002725 | ✓ | | US TREASURY N/B | 0.002602 | ✓ | | US TREASURY N/B | 0.002428 | ✓ | | US TREASURY N/B | 0.002421 | ✓ | | US TREASURY N/B | 0.002415 | ✓ | | US TREASURY N/B | 0.002412 | ✓ | | US TREASURY N/B | 0.002401 | ✓ | | US TREASURY N/B | 0.002394 | ✓ | | US TREASURY N/B | 0.002392 | ✓ | | US TREASURY N/B | 0.002360 | ✓ | | US TREASURY N/B | 0.002358 | ✓ | | US TREASURY N/B | 0.002330 | ✓ | | US TREASURY N/B | 0.002312 | ✓ | | US TREASURY N/B | 0.002295 | ✓ | | US TREASURY N/B | 0.002286 | ✓ | | US TREASURY N/B | 0.002284 | ✓ | | US TREASURY N/B | 0.002276 | ✓ | | US TREASURY N/B | 0.002272 | ✓ | | US TREASURY N/B | 0.002256 | ✓ | | US TREASURY N/B | 0.002244 | | | US TREASURY N/B | 0.002240 | ✓ | ## iShares Core Universal USD Bond ETF — top positions | Security | Weight | Shared | |----------|--------|--------| | Blackrock Liquidity TempCash Inst | 0.023010 | | | BlackRock Cash Funds: Treasury, SL Agency Shares | 0.007770 | | | US TREASURY N/B | 0.003831 | ✓ | | US TREASURY N/B | 0.003785 | ✓ | | US TREASURY N/B | 0.003777 | ✓ | | US TREASURY N/B | 0.003775 | ✓ | | US TREASURY N/B | 0.003711 | ✓ | | US TREASURY N/B | 0.003708 | ✓ | | US TREASURY N/B | 0.003548 | ✓ | | US TREASURY N/B | 0.003495 | ✓ | | US TREASURY N/B | 0.003432 | ✓ | | US TREASURY N/B | 0.003366 | ✓ | | FN MA4018 | 0.003335 | ✓ | | US TREASURY N/B | 0.003275 | ✓ | | US TREASURY N/B | 0.003210 | ✓ | | US TREASURY N/B | 0.003197 | ✓ | | US TREASURY N/B | 0.003052 | ✓ | | US TREASURY N/B | 0.002966 | ✓ | | US TREASURY N/B | 0.002932 | ✓ | | US TREASURY N/B | 0.002756 | ✓ | | US TREASURY N/B | 0.002756 | ✓ | | US TREASURY N/B | 0.002717 | ✓ | | US TREASURY N/B | 0.002668 | ✓ | | US TREASURY N/B | 0.002655 | ✓ | | US TREASURY N/B | 0.002640 | ✓ | | US TREASURY N/B | 0.002620 | ✓ | | US TREASURY N/B | 0.002614 | ✓ | | US TREASURY N/B | 0.002590 | ✓ | | US TREASURY N/B | 0.002588 | ✓ | | US TREASURY N/B | 0.002547 | ✓ | | US TREASURY N/B | 0.002547 | ✓ | | US TREASURY N/B | 0.002473 | ✓ | | US TREASURY N/B | 0.002452 | ✓ | | US TREASURY N/B | 0.002428 | | | US TREASURY N/B | 0.002422 | ✓ | | US TREASURY N/B | 0.002419 | ✓ | | US TREASURY N/B | 0.002404 | ✓ | | US TREASURY N/B | 0.002394 | ✓ | | US TREASURY N/B | 0.002390 | ✓ | | US TREASURY N/B | 0.002343 | | | US TREASURY N/B | 0.002333 | ✓ | | US TREASURY N/B | 0.002294 | ✓ | | US TREASURY N/B | 0.002260 | ✓ | | US TREASURY N/B | 0.002248 | ✓ | | US TREASURY N/B | 0.002241 | ✓ | | US TREASURY N/B | 0.002226 | ✓ | | US TREASURY N/B | 0.002211 | ✓ | | G2 MA7192 | 0.002184 | ✓ | | US TREASURY N/B | 0.002144 | ✓ | | US TREASURY N/B | 0.002127 | ✓ | ## Sources - N-PORT (fund A) — accession `0000794105-26-000185` (as of 2026-03-31) - N-PORT (fund B) — accession `0002071691-26-007327` (as of 2026-01-31) --- _Informational only — not investment advice. FundWatcher presents publicly available data and makes no recommendation to buy or sell any security. Verify all figures against the source filing before relying on them._ _Data sourced from U.S. SEC EDGAR filings (Forms N-PORT, N-CEN, and prospectus Risk/Return summaries). FundWatcher is not affiliated with the SEC._ _Use of this data is subject to the FundWatcher Terms of Service. Information may be used only for personal, non-commercial research and may not be redistributed. See _