iShares Core Universal USD Bond ETF
IUSB
844 hedge funds and large institutions have $33.4B invested in iShares Core Universal USD Bond ETF in 2025 Q4 according to their latest regulatory filings, with 152 funds opening new positions, 372 increasing their positions, 246 reducing their positions, and 45 closing their positions.
238% more first-time investments, than exits
New positions opened: 152 | Existing positions closed: 45
51% more repeat investments, than reductions
Existing positions increased: 372 | Existing positions reduced: 246
12% more funds holding
Funds holding: 754 → 844 (+90)
12% more funds holding in top 10
Funds holding in top 10: 86 → 96 (+10)
1.95% more ownership
Funds ownership: 95.6% → 97.55% (+1.9%)
5% more capital invested
Capital invested by funds: $31.9B → $33.4B (+$1.51B)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
BlackRock
New York
|
+$443M |
| 2 |
Jones Financial Companies
Des Peres,
Missouri
|
+$243M |
| 3 |
Northwestern Mutual Wealth Management
Milwaukee,
Wisconsin
|
+$109M |
| 4 |
SP
Symmetry Partners
Glastonbury,
Connecticut
|
+$104M |
| 5 |
Mariner
Overland Park,
Kansas
|
+$98.9M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Envestnet Asset Management
Chicago,
Illinois
|
-$193M |
| 2 |
JP Morgan Chase
New York
|
-$86.3M |
| 3 |
Citadel Advisors
Miami,
Florida
|
-$59.9M |
| 4 |
IWC
Integrated Wealth Concepts
Waltham,
Massachusetts
|
-$22.6M |
| 5 |
PAS
Park Avenue Securities
New York
|
-$15.1M |
IUSB Hedge Fund Activity: Q4 2025 in Review
844 of the 8,284 institutional investors tracked by Wall St. Rank reported a position in iShares Core Universal USD Bond ETF (IUSB) for Q4 2025, worth a combined $33.4B — up 4.7% from $31.9B a quarter earlier.
Buyers outnumbered sellers: 152 funds opened new IUSB positions and 45 closed out — a net gain of 107 holders — while 372 added to existing stakes and 246 trimmed.
The largest buyer was BlackRock, adding an estimated $443M. The largest seller was Envestnet Asset Management, cutting an estimated $193M.
- 844 institutional investors held iShares Core Universal USD Bond ETF (IUSB) as of Q4 2025, up from 754 in Q3 2025.
- Funds reported $33.4B of iShares Core Universal USD Bond ETF stock for Q4 2025, up 4.7% quarter-over-quarter.
- 152 funds opened new iShares Core Universal USD Bond ETF positions in Q4 2025 and 45 closed out, a net change of +107 holders.
- The largest iShares Core Universal USD Bond ETF buyer in Q4 2025 was BlackRock, an estimated $443M added.
- The largest iShares Core Universal USD Bond ETF seller in Q4 2025 was Envestnet Asset Management, an estimated $193M sold.
Based on aggregated 13F filings for Q4 2025.