RMM · RiverNorth Managed Duration Municipal Income Fund, Inc. · Holdings

$13.29 +0.01 (+0.08%) At close · Oct 27

Market Cap

$262.14M

19.74M

Volume · Oct 27 48.92K Avg daily vol (3M) 64.32K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of RMM: 13F, 13D and 13G, insiders and funds →

The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.

Quarter:

Holders: 53

Total Value: $54,672,407

Total Shares: 3,749,851

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 53 13F filers

Top Holder

10.8%

of institutional value

Top 5

43.7%

of institutional value

Top 10

68.1%

of institutional value

HHI

575

Broadly held

Who Holds RMM

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 51 filers, like-for-like change +13.5%; actively managed books +14.1%; index-like books +5.0%.

Holder type	Share	Filers	Change	New	Exited
Registered adviser	33.3%	26	+9.4%	4	3
Adviser	1.4%	1	+101.8%	0	0
Bank	22.2%	5	+3.4%	0	0
Broker-dealer	2.4%	1	+3.1%	0	0
Holding company	8.2%	2	+10.0%	0	0
Unknown	32.5%	16	+26.4%	3	2

Style	Share	Filers	Change	New	Exited
Index-like	6.4%	1	+5.0%	0	0
Systematic-like	0.3%	1	new	1	0
Concentrated	4.5%	4	+11.3%	1	1
Diversified active	88.8%	45	+13.9%	5	4
Not measured	0.0%	0	—	0	0
Unknown	0.0%	0	—	0	0

Turnover	Share	Filers	Change	New	Exited
Low turnover	76.9%	38	+11.6%	3	3
Medium turnover	21.1%	7	+23.7%	2	0
High turnover	0.3%	1	-8.8%	1	1
Unknown	1.6%	5	-6.1%	1	1
Not measured	0.0%	0	—	0	0

Holding horizon	Share	Filers	Change	New	Exited
Short horizon	1.5%	4	-1.9%	1	1
Medium horizon	5.5%	7	-24.8%	2	1
Long horizon	82.1%	39	+21.8%	4	2
Unknown	10.8%	1	-8.0%	0	1
Not measured	0.0%	0	—	0	0

13F book size	Share	Filers	Change	New	Exited
Under $1B	18.2%	14	-3.4%	1	1
$1B to $10B	20.1%	13	-14.1%	1	4
$10B to $100B	25.7%	14	+136.0%	3	0
$100B or more	36.0%	10	+2.9%	2	0
Not measured	0.0%	0	—	0	0

Client base	Share	Filers	Change	New	Exited
Individuals and high net worth	25.3%	24	+5.2%	3	2
Pooled investment vehicles	0.3%	1	new	1	0
Registered funds and BDCs	7.6%	1	+20.4%	0	1
Pension and profit sharing plans	0.0%	0	—	0	0
Unknown	66.7%	25	+15.7%	3	2

Private funds	Share	Filers	Change	New	Exited
Hedge funds	0.3%	1	-8.8%	1	1
Private equity funds	0.0%	1	0.0%	0	0
Real estate funds	4.6%	2	+2787.1%	1	0
Other private funds	12.9%	4	+11.1%	0	0
No private funds	15.5%	18	-15.1%	2	1
Mixed private funds	0.0%	0	-100.0%	0	1
Unknown	66.7%	25	+15.7%	3	2

Location	Share	Filers	Change	New	Exited
United States	88.7%	49	+14.8%	7	5
Outside the US	11.3%	2	+4.4%	0	0

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 1 holder with no observed 2026-06-30 13F.

Conviction and Crowding

51 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders

0.000% of filers hold it in their top 10

Mar 31, 2026: 0

Holders above 5%

median weight 0.002%

Mar 31, 2026: 0

Crowding

—

no cover-page share count is dated within about a year of the quarter end

Private-fund advisers

—

of shares outstanding

Institutional ownership

—

no cover-page share count is dated within about a year of the quarter end

Top 10 holders

68.1%

of 13F shares, Herfindahl 0.057

Active holders

+14.1%

like-for-like share change of active filers

5% stakes on record

0 13D, 0 13G

How long holders have held it value-weighted 14.0 quarters

Under 1 year 21.6% 1 to 3 years 31.1% 3 years or more 47.3% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost

$14.35

estimated per share

Mar 31, 2026: $14.32

Quarter-end price

$14.78

implied by 13F values

Estimated gain or loss

+3.0%

price against the estimated cost

Estimated at a loss

12.2%

of costed 13F value

Estimated cost covers 62.5% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Fund Ownership of RMM by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 0.00% of shares outstanding.

Fund type	Of shares outstanding	Change	Shares	Funds
Index funds	0.00%	0.00 pp	0	0
Index ETFs	0.00%	0.00 pp	0	0
Active ETFs	0.00%	0.00 pp	0	0
Active funds	2.07%	-0.11 pp	409,360	1
Unclassified	0.00%	0.00 pp	0	0
All registered funds	2.07%	-0.11 pp	409,360	1

How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 26 Adviser 1 Bank 6 Broker-dealer 1 Holding company 2 Unknown 17

Showing 53 of 53

All Common Calls Puts

Compact Export CSV

Holder

Value (USD)

% of 13F

ROBINSON CAPITAL MANAGEMENT, LLC

$6,051,978

11.07%

409,360

WELLS FARGO & COMPANY/MN

$5,986,425

10.95%

404,926

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
WELLS FARGO ADVISORS FINANCIAL NETWORK, LLC	125,426	$1,854,297	31.0%	Defined
WELLS FARGO CLEARING SERVICES, LLC	279,500	$4,132,128	69.0%	Defined

GUGGENHEIM CAPITAL LLC

$4,447,633

8.14%

300,841

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
GUGGENHEIM FUNDS DISTRIBUTORS, LLC	300,841	$4,447,633	100.0%	Defined

Advisors Asset Management, Inc.

$4,268,746

7.81%

288,741

ROYAL BANK OF CANADA

$3,697,980

6.76%

250,134

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RBC Capital Markets, LLC	241,360	$3,568,266	96.5%	Defined
RBC Trust Co (Delaware) Ltd	8,774	$129,714	3.5%	Defined

MORGAN STANLEY

$3,566,624

6.52%

241,249

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
MORGAN STANLEY SMITH BARNEY LLC	241,249	$3,566,624	100.0%	Defined

UBS Group AG

$2,604,629

4.76%

176,179

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
UBS Financial Services Inc	176,178	$2,604,615	100.0%	Defined
UBS Securities LLC	1	$14	0.0%	Defined

ProVise Management Group, LLC

$2,521,041

4.61%

170,525

Arax Advisory Partners

$2,472,298

4.52%

167,228

Kestra Advisory Services, LLC

$2,450,921

4.48%

165,782

Rockefeller Capital Management L.P.

$1,874,064

3.43%

126,763

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
ROCKEFELLER FINANCIAL LLC	126,763	$1,874,064	100.0%	Defined

Wagner Wealth Management, LLC

$1,640,871

3.00%

130,851

RAYMOND JAMES FINANCIAL INC

$1,379,154

2.52%

93,287

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
RAYMOND JAMES & ASSOCIATES	65,313	$965,587	70.0%	Defined
Raymond James Financial Services Advisors, Inc.	27,974	$413,567	30.0%	Defined

LPL Financial LLC

$1,352,381

2.47%

91,476

OSAIC HOLDINGS, INC.

$994,963

1.82%

67,300

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
OSAIC WEALTH, INC.	67,300	$994,963	100.0%	Defined

Gateway Wealth Partners, LLC

$852,593

1.56%

57,670

Janney Montgomery Scott LLC

$778,495

1.42%

52,658

STIFEL FINANCIAL CORP

$775,775

1.42%

52,474

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
STIFEL NICOLAUS & CO INC \MO\	52,474	$775,775	100.0%	Defined

WEDBUSH SECURITIES INC

$698,979

1.28%

55,740

Estate Planners Group, LLC

$621,918

1.14%

42,067

Apollon Wealth Management, LLC

$555,772

1.02%

44,320

OPPENHEIMER & CO INC

$549,302

1.00%

43,804

&PARTNERS

$444,096

0.81%

30,039

HighTower Advisors, LLC

$386,025

0.71%

26,111

Stratos Wealth Partners, LTD.

$375,883

0.69%

25,425

XML Financial, LLC

$365,164

0.67%

24,700

COMMONWEALTH EQUITY SERVICES, LLC

$276,179

0.51%

18,681

Abel Hall, LLC

$250,800

0.46%

20,000

River Street Advisors LLC

$247,376

0.45%

19,727

NewEdge Advisors, LLC

$244,675

0.45%

16,550

Samalin Investment Counsel, LLC

$237,469

0.43%

18,937

HUB Investment Partners, LLC

$207,434

0.38%

14,031

CreativeOne Wealth, LLC

$192,857

0.35%

13,045

AE Wealth Management LLC

$187,756

0.34%

12,700

CITADEL ADVISORS LLC

$180,350

0.33%

12,199

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Citadel Securities GP LLC	12,199	$180,350	100.0%	Defined

Closed-End Fund Advisors, Inc.

$175,988

0.32%

11,904

Cetera Investment Advisers

$168,478

0.31%

11,396

MELFA WEALTH MANAGEMENT, INC.

$162,727

0.30%

11,007

FIFTH THIRD BANCORP

$88,704

0.16%

6,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
Fifth Third Bank, National Association	6,000	$88,704	100.0%	Defined

EverSource Wealth Advisors, LLC

$88,704

0.16%

6,000

Steward Partners Investment Advisory, LLC

$88,674

0.16%

5,998

Noble Wealth Management PBC

$40,755

0.07%

3,250

Advocate Investing Services LLC

$31,350

0.06%

2,500

US BANCORP \DE\

$29,568

0.05%

2,000

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
US BANK NATIONAL ASSOCIATION	2,000	$29,568	100.0%	Defined

HARBOUR INVESTMENTS, INC.

$18,480

0.03%

1,250

Clear Street Group Inc.

$12,285

0.02%

831

Bank of New Hampshire

$6,270

0.01%

500

West Branch Capital LLC

$6,270

0.01%

500

Triumph Capital Management

$6,270

0.01%

500

HIGHLINE WEALTH PARTNERS LLC

$5,643

0.01%

450

HOLLENCREST CAPITAL MANAGEMENT

$3,622

0.01%

245

Allworth Financial LP

0.00%

JPMORGAN CHASE & CO

0.00%

This filing is a combination report: the position is filed across the managers below.

Manager	Shares	Value (USD)	% of position	Discretion
55I, LLC	0	$0	0.0%	Other

Key facts CIK 1771226 CUSIP 76882H105 13F (30d) 13 filings 13 filers Visit website Investor relations