Main Street Capital CORP

MAIN

Exchange: NYSE
SEC CIK: 0001396440

SEC filings (opens in a new tab)

In the last 90 days, Main Street Capital CORP insiders filed 1 open-market purchase and 1 sale; 401 institutions reported holding it in 13F filings for Q2 2026, worth $1.18B in total; no superinvestor holds it.

13F holders, Q3 2026

Institutional positions in Main Street Capital CORP as of Sep 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Q3 2026 data is still coming in (13F filing deadline: Nov 16, 2026), so these numbers are incomplete.

Institutional holders: 5; +2 vs. Q2 2026
Shares held: 97.7K; +3.23K (+3.4%) vs. Q2 2026
Total value: $5.38M; +$476.7K (+9.7%) vs. Q2 2026
New holders: 2; 1 more added
Sold out: 0; 1 more reduced

398 institutions that held it in Q2 2026 haven't filed for Q3 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q2 2026: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting MAIN on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holders

Value held

Institutions holding MAIN and their total value by quarter
Quarter	Holders	Value
Q2 2026	401	$1.18B
Q1 2026	423	$1.24B
Q4 2025	431	$1.26B
Q3 2025	408	$1.27B
Q2 2025	405	$1.17B
Q1 2025	393	$1.07B
Q4 2024	401	$1.10B
Q3 2024	354	$931.0M
Q2 2024	340	$869.4M
Q1 2024	326	$804.4M
Q4 2023	313	$752.3M
Q3 2023	292	$716.5M
Q2 2023	289	$660.3M
Q1 2023	273	$617.8M
Q4 2022	273	$571.7M
Q3 2022	248	$491.5M
Q2 2022	244	$533.6M
Q1 2022	256	$546.5M
Q4 2021	257	$558.7M
Q3 2021	236	$508.1M
Q2 2021	228	$488.5M
Q1 2021	230	$511.5M

Institutions, Q3 2026

Shares, value and share of portfolio for each institution holding Main Street Capital CORP; share changes are against Q2 2026.

Institutions holding MAIN in Q3 2026
Institution	Shares	Value	% of portfolio	Change in shares	Action
AE Wealth Management LLC	–	–	–	–	Not filed
Foundations Investment Advisors, LLC	–	–	–	–	Not filed
Geneos Wealth Management Inc.	–	–	–	–	Not filed
Coldstream Capital Management Inc	–	–	–	–	Not filed
Legacy Capital Wealth Partners, LLC	–	–	–	–	Not filed
Citadel Advisors LLC	–	–	–	–	Not filed
Susquehanna Fundamental Investments, LLC	–	–	–	–	Not filed
Arkadios Wealth Advisors	–	–	–	–	Not filed
Universal- Beteiligungs- und Servicegesellschaft mbH	–	–	–	–	Not filed
Manufacturers Life Insurance Company, The	–	–	–	–	Not filed
Entropy Technologies, LP	–	–	–	–	Not filed
Wealth Enhancement Advisory Services, LLC	–	–	–	–	Not filed
Dearborn Partners LLC	–	–	–	–	Not filed
Sigma Planning Corp	–	–	–	–	Not filed
National Asset Management, Inc.	–	–	–	–	Not filed
Neuberger Berman Group LLC	–	–	–	–	Not filed
Quantinno Capital Management LP	–	–	–	–	Not filed
Bokf, NA	–	–	–	–	Not filed
Mackenzie Financial Corp	–	–	–	–	Not filed
Widmann Financial Services, Inc.	–	–	–	–	Not filed
Castleview Partners, LLC	–	–	–	–	Not filed
AQR Capital Management LLC	–	–	–	–	Not filed
Atom Investors LP	–	–	–	–	Not filed
Savvy Advisors, Inc.	–	–	–	–	Not filed
SMH Capital Advisors Inc	–	–	–	–	Not filed
CI Private Wealth, LLC	–	–	–	–	Not filed
Strategy Asset Managers LLC	–	–	–	–	Not filed
Arete Wealth Advisors, LLC	–	–	–	–	Not filed
MAI Capital Management	–	–	–	–	Not filed
Cerity Partners LLC	–	–	–	–	Not filed
Generali Investments CEE, investicni spolecnost, a.s.	–	–	–	–	Not filed
Baird Financial Group, Inc.	–	–	–	–	Not filed
Simon Quick Advisors, LLC	–	–	–	–	Not filed
WealthPLAN Partners, LLC	–	–	–	–	Not filed
Natixis	–	–	–	–	Not filed
Ronald Blue Trust, Inc.	–	–	–	–	Not filed
TCG Advisory Services, LLC	–	–	–	–	Not filed
Delta Investment Management, LLC	–	–	–	–	Not filed
DnB Asset Management AS	–	–	–	–	Not filed
MML Investors Services, LLC	–	–	–	–	Not filed
Callahan Advisors, LLC	–	–	–	–	Not filed
SS&H Financial Advisors, Inc.	–	–	–	–	Not filed
Mercer Global Advisors Inc	–	–	–	–	Not filed
Janney Montgomery Scott LLC	–	–	–	–	Not filed
Captrust Financial Advisors	–	–	–	–	Not filed
Sanctuary Advisors, LLC	–	–	–	–	Not filed
Truist Financial Corp	–	–	–	–	Not filed
Uncommon Cents Investing LLC	–	–	–	–	Not filed
Wedmont Private Capital	–	–	–	–	Not filed
Advisory Advocates, LLC	–	–	–	–	Not filed
Cordoba Advisory Partners LLC	–	–	–	–	Not filed
Chilton Capital Management LLC	–	–	–	–	Not filed
Steward Partners Investment Advisory, LLC	–	–	–	–	Not filed
Americana Partners, LLC	–	–	–	–	Not filed
Greenland Capital Management LP	–	–	–	–	Not filed
Signature Equity Partners, LLC	–	–	–	–	Not filed
ProShare Advisors LLC	–	–	–	–	Not filed
Venturi Wealth Management, LLC	–	–	–	–	Not filed
Belpointe Asset Management LLC	–	–	–	–	Not filed
Fortis Capital Advisors, LLC	–	–	–	–	Not filed
Stifel Financial Corp	–	–	–	–	Not filed
NewEdge Wealth, LLC	–	–	–	–	Not filed
HB Wealth Management, LLC	–	–	–	–	Not filed
Mindset Wealth Management, LLC	–	–	–	–	Not filed
WCG Wealth Advisors LLC	–	–	–	–	Not filed
Wiley Bros.-Aintree Capital, LLC	–	–	–	–	Not filed
Financial Security Advisor, Inc.	–	–	–	–	Not filed
PFG Investments, LLC	–	–	–	–	Not filed
Independent Financial Group, LLC	–	–	–	–	Not filed
Smartleaf Asset Management LLC	–	–	–	–	Not filed
JustInvest LLC	–	–	–	–	Not filed
Tradition Wealth Management, LLC	–	–	–	–	Not filed
Colony Group, LLC	–	–	–	–	Not filed
Allworth Financial LP	–	–	–	–	Not filed
Guggenheim Capital LLC	–	–	–	–	Not filed
Equitable Holdings, Inc.	–	–	–	–	Not filed
AlTi Global, Inc.	–	–	–	–	Not filed
Westbourne Investment Advisors, Inc.	–	–	–	–	Not filed
Eagle Global Advisors LLC	–	–	–	–	Not filed
Catalyst Capital Advisors LLC	–	–	–	–	Not filed
Fiduciary Group LLC	–	–	–	–	Not filed
RMR Wealth Builders	–	–	–	–	Not filed
Inscription Capital, LLC	–	–	–	–	Not filed
Triumph Capital Management	–	–	–	–	Not filed
Vise Technologies, Inc.	–	–	–	–	Not filed
D.B. Root & Company, LLC	–	–	–	–	Not filed
Krane Funds Advisors LLC	–	–	–	–	Not filed
Newbridge Financial Services Group, Inc.	–	–	–	–	Not filed
Capital Performance Advisors LLP	–	–	–	–	Not filed
Two Sigma Investments, LP	–	–	–	–	Not filed
Icon Wealth Advisors, LLC	–	–	–	–	Not filed
LGT Group Foundation	–	–	–	–	Not filed
Bartlett & Co. Wealth Management LLC	–	–	–	–	Not filed
Balboa Wealth Partners	–	–	–	–	Not filed
Kingsview Wealth Management, LLC	–	–	–	–	Not filed
Merit Financial Group, LLC	–	–	–	–	Not filed
Archer Investment Corp	–	–	–	–	Not filed
Mutual Advisors, LLC	–	–	–	–	Not filed
Vertex Planning Partners, LLC	–	–	–	–	Not filed
Jones Financial Companies LLLP	–	–	–	–	Not filed