# Portfolio overlap — ISTB vs IUSB Comparing **iShares Core 1-5 Year USD Bond ETF** (2026-01-31) and **iShares Core Universal USD Bond ETF** (2026-01-31). - Shared positions: 6847 - iShares Core 1-5 Year USD Bond ETF covered by iShares Core Universal USD Bond ETF: 0.3710768032116363784294401956 - iShares Core Universal USD Bond ETF covered by iShares Core 1-5 Year USD Bond ETF: 0.3710768032116363784294401955 ## iShares Core 1-5 Year USD Bond ETF — top positions | Security | Weight | Shared | |----------|--------|--------| | BlackRock Cash Funds: Treasury, SL Agency Shares | 0.013071 | ✓ | | US TREASURY N/B | 0.011152 | ✓ | | US TREASURY N/B | 0.009952 | ✓ | | US TREASURY N/B | 0.009801 | ✓ | | US TREASURY N/B | 0.009154 | ✓ | | US TREASURY N/B | 0.008731 | ✓ | | US TREASURY N/B | 0.008628 | ✓ | | US TREASURY N/B | 0.008313 | ✓ | | US TREASURY N/B | 0.008145 | ✓ | | US TREASURY N/B | 0.007320 | ✓ | | US TREASURY N/B | 0.007131 | ✓ | | US TREASURY N/B | 0.007089 | ✓ | | US TREASURY N/B | 0.006865 | ✓ | | US TREASURY N/B | 0.006761 | ✓ | | US TREASURY N/B | 0.006583 | ✓ | | US TREASURY N/B | 0.006398 | ✓ | | US TREASURY N/B | 0.006390 | ✓ | | US TREASURY N/B | 0.006316 | ✓ | | US TREASURY N/B | 0.006150 | ✓ | | US TREASURY N/B | 0.006047 | ✓ | | US TREASURY N/B | 0.005979 | ✓ | | US TREASURY N/B | 0.005937 | ✓ | | US TREASURY N/B | 0.005833 | ✓ | | US TREASURY N/B | 0.005649 | ✓ | | US TREASURY N/B | 0.005474 | ✓ | | US TREASURY N/B | 0.005456 | ✓ | | US TREASURY N/B | 0.005406 | ✓ | | US TREASURY N/B | 0.005404 | ✓ | | US TREASURY N/B | 0.005319 | ✓ | | US TREASURY N/B | 0.005303 | ✓ | | US TREASURY N/B | 0.005170 | ✓ | | US TREASURY N/B | 0.005126 | ✓ | | US TREASURY N/B | 0.005068 | ✓ | | US TREASURY N/B | 0.005059 | ✓ | | US TREASURY N/B | 0.004988 | ✓ | | US TREASURY N/B | 0.004965 | ✓ | | US TREASURY N/B | 0.004924 | ✓ | | US TREASURY N/B | 0.004751 | ✓ | | US TREASURY N/B | 0.004742 | ✓ | | US TREASURY N/B | 0.004731 | ✓ | | US TREASURY N/B | 0.004619 | ✓ | | US TREASURY N/B | 0.004603 | ✓ | | US TREASURY N/B | 0.004561 | ✓ | | US TREASURY N/B | 0.004540 | ✓ | | US TREASURY N/B | 0.004533 | ✓ | | US TREASURY N/B | 0.004489 | ✓ | | US TREASURY N/B | 0.004450 | ✓ | | US TREASURY N/B | 0.004437 | ✓ | | US TREASURY N/B | 0.004433 | ✓ | | US TREASURY N/B | 0.004299 | ✓ | ## 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 `0001410368-26-031810` (as of 2026-01-31) - 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 _