iShares Core 1-5 Year USD Bond ETF
ISTB
389 hedge funds and large institutions have $3.34B invested in iShares Core 1-5 Year USD Bond ETF in 2025 Q4 according to their latest regulatory filings, with 41 funds opening new positions, 172 increasing their positions, 113 reducing their positions, and 29 closing their positions.
52% more repeat investments, than reductions
Existing positions increased: 172 | Existing positions reduced: 113
41% more first-time investments, than exits
New positions opened: 41 | Existing positions closed: 29
30% more funds holding in top 10
Funds holding in top 10: 30 → 39 (+9)
6% more capital invested
Capital invested by funds: $3.14B → $3.34B (+$202M)
2% more funds holding
Funds holding: 380 → 389 (+9)
1.04% more ownership
Funds ownership: 68.96% → 70.01% (+1%)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
AA
Acorns Advisers
Irvine,
California
|
+$27.4M |
| 2 |
Ameriprise
Minneapolis,
Minnesota
|
+$16.9M |
| 3 |
BWM
Boyd Wealth Management
Sacramento,
California
|
+$13.2M |
| 4 |
Jones Financial Companies
Des Peres,
Missouri
|
+$12.4M |
| 5 |
JP Morgan Chase
New York
|
+$10.3M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
-$48.7M |
| 2 |
Renaissance Technologies
New York
|
-$11.3M |
| 3 |
Russell Investments Group
London,
United Kingdom
|
-$6.28M |
| 4 |
FPAS
Focus Partners Advisor Solutions
Saint Louis,
Missouri
|
-$3.15M |
| 5 |
MFA
McClarren Financial Advisors
State College,
Pennsylvania
|
-$2.79M |
ISTB Hedge Fund Activity: Q4 2025 in Review
389 of the 8,284 institutional investors tracked by Wall St. Rank reported a position in iShares Core 1-5 Year USD Bond ETF (ISTB) for Q4 2025, worth a combined $3.34B — up 6.4% from $3.14B a quarter earlier.
Buyers outnumbered sellers: 41 funds opened new ISTB positions and 29 closed out — a net gain of 12 holders — while 172 added to existing stakes and 113 trimmed.
The largest buyer was Acorns Advisers, adding an estimated $27.4M. The largest seller was BlackRock, cutting an estimated $48.7M.
- 389 institutional investors held iShares Core 1-5 Year USD Bond ETF (ISTB) as of Q4 2025, up from 380 in Q3 2025.
- Funds reported $3.34B of iShares Core 1-5 Year USD Bond ETF stock for Q4 2025, up 6.4% quarter-over-quarter.
- 41 funds opened new iShares Core 1-5 Year USD Bond ETF positions in Q4 2025 and 29 closed out, a net change of +12 holders.
- The largest iShares Core 1-5 Year USD Bond ETF buyer in Q4 2025 was Acorns Advisers, an estimated $27.4M added.
- The largest iShares Core 1-5 Year USD Bond ETF seller in Q4 2025 was BlackRock, an estimated $48.7M sold.
Based on aggregated 13F filings for Q4 2025.