iShares MBS

MBB • NASDAQ

iShares MBS is an exchange-traded fund on NASDAQ. As of Q3 2025, 899 institutional investors hold shares in this ETF, with total holdings valued at $36.3B. BANK OF AMERICA CORP /DE/ is the largest holder with a position valued at $6.8B.

Overview

Overview of institutional ownership in MBB as of Q3 2025

All Institutions

Institutions: 899
Value Held: $36.3B
Shares Held: 381.8M
Avg Position: $40.4M
Median Position: $1.3M

Hedge Funds

Hedge Funds: 12
Value Held: $151.1M
Shares Held: 1.6M
Avg Position: $12.6M
Median Position: $762.0K

Biggest Investors

Institutions with the largest positions in MBB as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
BANK OF AMERICA CORP /DE/ Institution	Brian T. Moynihan CEO	$6.8B 0.51% of portfolio	71.9M shares	≤ Q2 2013 Held for 12y 5m+	$1.33T
JPMORGAN CHASE & CO Institution	Jamie Dimon CEO	$4.9B 0.31% of portfolio	51.7M shares	≤ Q2 2013 Held for 12y 5m+	$1.56T
ENVESTNET ASSET MANAGEMENT INC Long Only Manager	Christopher Russell Todd CEO	$2.6B 0.76% of portfolio	27.5M shares	≤ Q2 2013 Held for 12y 5m+	$341.99B
L LPL Financial LLC Institution	-	$2.5B 0.75% of portfolio	26.8M shares	≤ Q2 2013 Held for 12y 5m+	$340.07B
T TIAA TRUST, NATIONAL ASSOCIATION Institution	-	$2.4B 5.86% of portfolio	25.4M shares	Q3 2023 Held for 2y 2m	$41.2B
F Fisher Asset Management, LLC Institution	-	$2.1B 0.78% of portfolio	22.5M shares	≤ Q2 2013 Held for 12y 5m+	$276.29B
AMERIPRISE FINANCIAL INC Institution	Jim Cracchiolo CEO	$1.4B 0.31% of portfolio	14.3M shares	≤ Q2 2013 Held for 12y 5m+	$433.11B
MORGAN STANLEY RIA/Wealth	Jed Finn CEO	$900.9M 0.05% of portfolio	9.5M shares	≤ Q2 2013 Held for 12y 5m+	$1.65T
BARCLAYS PLC Institution	-	$726.3M 0.27% of portfolio	7.6M shares	Q2 2025 Held for 5 months	$271.65B
RENAISSANCERE HOLDINGS LTD RIA/Wealth	Blake Thornton Headley President	$366.6M 49.46% of portfolio	3.9M shares	Q1 2025 Held for 8 months	$741.2M

Net Capital Flow

Institutional buying and selling activity for MBB in Q3 2025

Net Flow: +$1.6B
Buyers: 445
Sellers: 358
Total Bought: +$2.5B
Total Sold: −$847.8M
Avg Position: $40.1M

Biggest Buyers

Institution	Net Bought	Current Position
BANK OF AMERICA CORP /DE/ Institution	+$719.9M +7.6M shares	$6.8B 71.9M shares
BARCLAYS PLC Institution	+$316.2M +3.3M shares	$726.3M 7.6M shares
L LPL Financial LLC Institution	+$137.7M +1.4M shares	$2.5B 26.8M shares
T TIAA TRUST, NATIONAL ASSOCIATION Institution	+$133.2M +1.4M shares	$2.4B 25.4M shares
F Fisher Asset Management, LLC Institution	+$114.8M +1.2M shares	$2.1B 22.5M shares
JPMORGAN CHASE & CO Institution	+$112.5M +1.2M shares	$4.9B 51.7M shares
RENAISSANCERE HOLDINGS LTD RIA/Wealth	+$94.9M +997.0K shares	$366.6M 3.9M shares
MIDLAND WEALTH ADVISORS LLC RIA/Wealth	+$75.9M +797.2K shares	$252.6M 2.7M shares
ENVESTNET ASSET MANAGEMENT INC Long Only Manager	+$69.2M +727.1K shares	$2.6B 27.5M shares
Wright Fund Managment, LLC Long Only Manager	+$38.4M +403.3K shares	$39.6M 416.5K shares

Biggest Sellers

Institution	Net Sold	Current Position
R ROYAL BANK OF CANADA Institution	−$102.9M −1.1M shares	$170.2M 1.8M shares
Bank of New York Mellon Corp Institution	−$98.1M −1.0M shares	$193.9M 2.0M shares
GENWORTH FINANCIAL WEALTH MANAGEMENT, INC Long Only Manager	−$81.1M −852.8K shares	$17.6M 184.6K shares
S Sumitomo Mitsui Trust Holdings, Inc. Institution	−$51.8M −544.3K shares	$58.6M 615.7K shares
S STIFEL FINANCIAL CORP Long Only Manager	−$39.2M −411.5K shares	$338.7M 3.6M shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	−$35.4M −372.0K shares	$63.6M 668.1K shares
Change Path, LLC RIA/Wealth	−$26.9M −282.9K shares	$2.0M 20.9K shares
M Mitsubishi UFJ Trust & Banking Corp Institution	−$25.3M −266.2K shares	$21.6M 226.8K shares
R READYSTATE ASSET MANAGEMENT LP Hedge Fund•Multi-Strategy	−$20.3M −215.9K shares	Sold Off 0 shares
Centiva Capital, LP Hedge Fund•Multi-Strategy	−$20.2M −214.8K shares	Sold Off 0 shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited MBB in Q3 2025

New Positions: 37
New Value: $166.1M
Exited Positions: 80
Exited Value: $95.3M

New Positions

Institution	Position Value
A Annex Advisory Services, LLC Institution	$81.9M 860.4K shares
D DYMON ASIA CAPITAL PTE. LTD. Institution	$49.8M 523.7K shares
Pictet Asset Management Holding SA Long Only Manager	$10.1M 106.0K shares
Forefront Wealth Partners, LLC RIA/Wealth	$6.8M 71.7K shares
Siligmueller & Norvid Wealth Advisors LLC RIA/Wealth	$4.7M 49.0K shares
Integrity Advisory Solutions, LLC RIA/Wealth	$2.6M 27.0K shares
Compass Financial Group, Inc. RIA/Wealth	$2.5M 26.0K shares
Traveka Wealth, LLC RIA/Wealth	$1.1M 12.1K shares
S STEINBERGANNA WEALTH MANAGEMENT RIA/Wealth	$809.9K 8.5K shares
E Exit Wealth Advisors, LLC. RIA/Wealth	$737.4K 7.8K shares

Exited Positions

Institution	Previous Position
R READYSTATE ASSET MANAGEMENT LP Hedge Fund•Multi-Strategy	$20.3M 215.9K shares
Centiva Capital, LP Hedge Fund•Multi-Strategy	$20.2M 214.8K shares
P Pictet North America Advisors SA Institution	$13.4M 142.2K shares
M MANUFACTURERES LIFE INSURANCE CO Institution	$8.0M 85.0K shares
Duncan Williams Asset Management, LLC RIA/Wealth	$3.7M 39.0K shares
ARQ WEALTH ADVISORS, LLC RIA/Wealth	$3.5M 37.4K shares
W WealthPlan Investment Management, LLC RIA/Wealth	$2.3M 24.3K shares
L Laurel Wealth Advisors LLC RIA/Wealth	$1.8M 18.8K shares
VisionPoint Advisory Group, LLC RIA/Wealth	$1.6M 17.1K shares
PREVAIL INNOVATIVE WEALTH ADVISORS, LLC RIA/Wealth	$1.6M 17.0K shares

Options Activity

Institutions with the largest Call and Put options positions in MBB as of Q3 2025

Call Positions: 3
Call Value: $12.3M
Put Positions: 3
Put Value: $2.8M

Call Positions

Institution	Position Value
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$7.4M 776.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$2.9M 308.0 contracts
J JANE STREET GROUP, LLC Institution	$2.0M 211.0 contracts

Put Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$1.0M 110.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$951.5K 100.0 contracts
Meteora Capital, LLC Hedge Fund•Event Driven	$812.5K 2.5K contracts

Most Committed Institutions

Institutions with MBB as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
RENAISSANCERE HOLDINGS LTD RIA/Wealth	Blake Thornton Headley President	49.46% $366.6M	3.9M shares	Q1 2025 Held for 8 months	$741.2M
D DYMON ASIA CAPITAL PTE. LTD. Institution	-	19.95% $49.8M	523.7K shares	Q3 2025 Held for 2 months	$249.8M
A Avanda Investment Management Pte. Ltd. Institution	-	18.47% $23.5M	246.6K shares	Q2 2025 Held for 5 months	$127.0M
Sensible Financial Planning & Management, LLC. RIA/Wealth	Jr. Frederick Miller CEO	13.76% $75.7M	796.1K shares	Q1 2022 Held for 3y 8m	$550.7M
MIDLAND WEALTH ADVISORS LLC RIA/Wealth	Danny Leon Stevenson CEO	13.51% $252.6M	2.7M shares	Q4 2023 Held for 1y 11m	$1.9B
N NOTTINGHAM ADVISORS, INC. RIA/Wealth	Michael Thomas Cerminaro President	8.28% $59.6M	626.6K shares	Q4 2023 Held for 1y 11m	$719.8M
Tandem Wealth Advisors LLC RIA/Wealth	Chester Angus Schaal Managing Partner	7.07% $14.9M	156.4K shares	Q4 2022 Held for 2y 11m	$210.3M
Spectrum Investment Advisors, Inc. RIA/Wealth	James Francis Marshall Founder	7.00% $11.8M	123.5K shares	Q4 2023 Held for 1y 11m	$167.9M
A AAFMAA Wealth Management & Trust LLC Institution	-	6.62% $16.7M	175.4K shares	Q4 2023 Held for 1y 11m	$252.1M
T TIAA TRUST, NATIONAL ASSOCIATION Institution	-	5.86% $2.4B	25.4M shares	Q3 2023 Held for 2y 2m	$41.2B