iShares MBS ETF
1,022 hedge funds and large institutions have $35.1B invested in iShares MBS ETF in 2026 Q2 according to their latest regulatory filings, with 93 funds opening new positions, 555 increasing their positions, 247 reducing their positions, and 78 closing their positions.
125% more repeat investments, than reductions
Existing positions increased: 555 | Existing positions reduced: 247
19% more first-time investments, than exits
New positions opened: 93 | Existing positions closed: 78
0% more capital invested
Capital invested by funds: $34.9B → $35.1B (+$173M)
0% less funds holding
Funds holding: 1,027 → 1,022 (-5)
1.6% less ownership
Funds ownership: 90.17% → 88.58% (-1.6%)
8% less funds holding in top 10
Funds holding in top 10: 62 → 57 (-5)
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
1,022 of the 8,305 institutional investors tracked by Wall St. Rank reported a position in iShares MBS ETF (MBB) for Q2 2026, worth a combined $35.1B — up 0.49% from $34.9B a quarter earlier.
Buyers outnumbered sellers: 93 funds opened new MBB positions and 78 closed out — a net gain of 15 holders — while 555 added to existing stakes and 247 trimmed.
The largest buyer was Bank of America, adding an estimated $194M. The largest seller was UBS Group, cutting an estimated $316M.
- 1,022 institutional investors held iShares MBS ETF (MBB) as of Q2 2026, down from 1,027 in Q1 2026.
- Funds reported $35.1B of iShares MBS ETF stock for Q2 2026, up 0.49% quarter-over-quarter.
- 93 funds opened new iShares MBS ETF positions in Q2 2026 and 78 closed out, a net change of +15 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.