Estimated market cap $5.29BShares outstanding from the company’s latest SEC filing (all share classes, each priced at its own close; ADRs converted to ADS) × last close from Tiingo. Updated daily. This figure: shares as of Nov 5, 2026, last close Nov 13, 2026.93.85M shares, shares as of Nov 5, 2026CIK 1396440The SEC’s Central Index Key, the number it uses to identify every company and person that files.
Insider trades, 12 mo
2 buys · 2 sells
$2.40M sold, open market
Congress trades, 24 mo
—
No disclosed trades
13F holders
…
Lobbying, 12 mo
—
No lobbying filings
Federal contracts, 12 mo
—
None matched
Ask your AI:
Latest 10-Q
What changed in Main Street Capital Corporation's latest quarterly report, compared with the one before.
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Insider trades
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
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13F holders
Funds that report this stock, checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
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Top 10 holders.Premium lists every holder, with CSV downloads.
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
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Lobbying
What Main Street Capital Corporation and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
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Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
13F holders, Q3 2026Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
301
14.9% of shares · 111 added
Latest 10-Q
Q3 2026
What changed in Main Street Capital Corporation's latest quarterly report, compared with the one before.
Filed Nov 6, 2026 · Quarter ended Sep 30, 2026
AI No AI summary for this 10-Q: management's discussion could not be compared, and the other sections did not change.
Compared with the 10-Q for the quarter ended Jun 30, 2026. Sections compared: risk factors and legal proceedings.
Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.
No open-market insider trades reported since Aug 21, 2026. Insiders have two business days to file.
Recent insider trades
How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss.
301 funds report MAIN. Values checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.
Funds own 25% of shares (Q2 2026)Fund managers with more than $100 million in US-listed stocks file a 13F each quarter. It lists their long stock positions only (shorts, options and bonds are left out) and can arrive up to 45 days after the quarter ends, so this is a snapshot of the quarter end. We add up the shares every fund reports in this class and divide by the shares outstanding. The total can pass 100%: the same shares are often reported by more than one manager (an adviser and the fund it runs), lent shares can be reported twice, and the share count can be out of date after buybacks. We divided 22.95M reported shares by 93.51M shares, from the company’s SEC filing as of Aug 6, 2026.
403 funds hold the stock.
Q3 2026: 15% · 5,560 of ~8,900 funds reported so farFunds have 45 days after a quarter ends to file. This quarter’s reports are still arriving, so the figure only counts the funds that have filed so far and will usually rise.
Q2 202522%
Q3 202523%
Q4 202524%
Q1 202626%
Q2 202625%
Q3 2026 (so far)15%
Q3 2026. 34 new, 111 added to, 79 trimmed, 136 exited since Q2 2026.
Download CSVEvery fund that holds MAIN, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.
Trades by members of Congress
Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.
Recent congressional trades
How the stock has done since the trade date, measured against the S&P 500 over the same days. It describes the stock, not the trader's actual gain or loss.
What Main Street Capital Corporation and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.
No recent lobbying filings for this company.
Institutional ownership over time
How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.
Funds holding the stock
Shares they report
Funds holding the stock by quarter
Q2 2013
111
—
8.18M
$232.4M
Q3 2013
117
+6
10.78M
$328.2M
Q4 2013
124
+7
11.32M
$376.6M
Q1 2014
128
+4
12.01M
$398.7M
Q2 2014
133
+5
11.72M
$390.5M
Q3 2014
122
-11
11.19M
$348.6M
Q4 2014
134
+12
11.51M
$397.4M
Q1 2015
131
-3
13.26M
$414.8M
Q2 2015
132
+1
13.18M
$420.7M
Q3 2015
126
-6
14.34M
$384.4M
Q4 2015
135
+9
15.04M
$437.5M
Q1 2016
139
+4
14.45M
$453.0M
Q2 2016
145
+6
15.07M
$495.0M
Q3 2016
147
+2
13.96M
$479.3M
Q4 2016
171
+24
14.07M
$517.3M
Q1 2017
177
+6
15.20M
$581.7M
Q2 2017
176
-1
14.99M
$582.3M
Q3 2017
179
+3
15.71M
$623.8M
Q4 2017
204
+25
16.28M
$646.3M
Q1 2018
206
+2
15.19M
$559.8M
Q2 2018
204
-2
14.64M
$555.9M
Q3 2018
215
+11
14.56M
$589.9M
Q4 2018
218
+3
14.41M
$487.2M
Q1 2019
220
+2
14.16M
$525.7M
Q2 2019
223
+3
16.23M
$667.6M
Q3 2019
230
+7
14.49M
$627.3M
Q4 2019
252
+22
14.87M
$638.4M
Q1 2020
219
-33
14.30M
$282.4M
Q2 2020
208
-11
12.91M
$401.8M
Q3 2020
200
-8
13.30M
$393.5M
Q4 2020
211
+11
14.59M
$470.8M
Q1 2021
230
+19
13.05M
$511.8M
Q2 2021
228
-2
11.89M
$488.5M
Q3 2021
236
+8
12.34M
$508.3M
Q4 2021
256
+20
12.46M
$558.7M
Q1 2022
256
0
12.91M
$550.0M
Q2 2022
243
-13
13.81M
$532.7M
Q3 2022
248
+5
14.59M
$491.5M
Q4 2022
273
+25
15.53M
$571.7M
Q1 2023
273
0
15.66M
$617.8M
Q2 2023
289
+16
16.52M
$660.6M
Q3 2023
292
+3
17.64M
$716.5M
Q4 2023
311
+19
18.36M
$791.6M
Q1 2024
324
+13
18.84M
$887.7M
Q2 2024
338
+14
17.39M
$876.3M
Q3 2024
353
+15
18.69M
$933.8M
Q4 2024
400
+47
18.91M
$1.1B
Q1 2025
393
-7
18.93M
$1.1B
Q2 2025
406
+13
20.00M
$1.3B
Q3 2025
409
+3
20.43M
$1.3B
Q4 2025
433
+24
21.77M
$1.3B
Q1 2026
427
-6
23.39M
$1.2B
Q2 2026
403
-24
22.95M
$1.2B
Q3 2026
301
-102
14.03M
$800.6M
Each point is a quarter-end, from Q2 2013 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.
Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.
The history follows the company's current CUSIP number (56035L104). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q2 2013) can be later than the stock's first appearance in 13F reports.
Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.
A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.