iShares MBS ETF
1,029 hedge funds and large institutions have $35.1B invested in iShares MBS ETF in 2026 Q2 according to their latest regulatory filings, with 92 funds opening new positions, 560 increasing their positions, 249 reducing their positions, and 79 closing their positions.
125% more repeat investments, than reductions
Existing positions increased: 560 | Existing positions reduced: 249
16% more first-time investments, than exits
New positions opened: 92 | Existing positions closed: 79
1% more capital invested
Capital invested by funds: $34.9B → $35.1B (+$203M)
0% less funds holding
Funds holding: 1,031 → 1,029 (-2)
1.52% less ownership
Funds ownership: 90.22% → 88.69% (-1.5%)
5% less funds holding in top 10
Funds holding in top 10: 62 → 59 (-3)
56% less call options, than puts
Call options by funds: $350K | Put options by funds: $803K
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Bank of America
Charlotte,
North Carolina
|
+$194M |
| 2 |
Envestnet Asset Management
Chicago,
Illinois
|
+$190M |
| 3 |
Goldman Sachs
New York
|
+$134M |
| 4 |
MCM
MAI Capital Management
Independence,
Ohio
|
+$75.9M |
| 5 |
Pathstone Holdings
Englewood,
New Jersey
|
+$75.1M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
UBS Group
Zurich,
Switzerland
|
-$316M |
| 2 |
Barclays
London,
United Kingdom
|
-$163M |
| 3 |
EW
Evoke Wealth
Los Angeles,
California
|
-$84.1M |
| 4 |
LPL Financial
San Diego,
California
|
-$81M |
| 5 |
Bank of Montreal
Toronto,
Ontario, Canada
|
-$58.8M |
MBB Hedge Fund Activity: Q2 2026 in Review
1,029 of the 8,349 institutional investors tracked by Wall St. Rank reported a position in iShares MBS ETF (MBB) for Q2 2026, worth a combined $35.1B — up 0.58% from $34.9B a quarter earlier.
Buyers outnumbered sellers: 92 funds opened new MBB positions and 79 closed out — a net gain of 13 holders — while 560 added to existing stakes and 249 trimmed.
The largest buyer was Bank of America, adding an estimated $194M. The largest seller was UBS Group, cutting an estimated $316M.
- 1,029 institutional investors held iShares MBS ETF (MBB) as of Q2 2026, down from 1,031 in Q1 2026.
- Funds reported $35.1B of iShares MBS ETF stock for Q2 2026, up 0.58% quarter-over-quarter.
- 92 funds opened new iShares MBS ETF positions in Q2 2026 and 79 closed out, a net change of +13 holders.
- The largest iShares MBS ETF buyer in Q2 2026 was Bank of America, an estimated $194M added.
- The largest iShares MBS ETF seller in Q2 2026 was UBS Group, an estimated $316M sold.
Based on aggregated 13F filings for Q2 2026.