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$53.30 -0.06 (-0.11%) At close · Oct 21
Rebalance outlook locked
Market Cap
$4.98B
Shares
93.51M
Volume · Oct 21 256.23K Avg daily vol (3M) 504.15K

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 MAIN: 13F, 13D and 13G, insiders and funds →
Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
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.
Holders: 400
Total Value: $1,221,034,441
Total Shares: 23,512,518
Showing 1–100 of 406 holdings by value · page 1 of 5

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 404 13F filers
Top Holder
14.2%
Sep 2023 → Jun 2026 · range 11.1% – 19.6%
of institutional value
Top 5
35.1%
Sep 2023 → Jun 2026 · range 28.9% – 41.8%
of institutional value
Top 10
46.7%
Sep 2023 → Jun 2026 · range 40.0% – 51.0%
of institutional value
HHI
387
Sep 2023 → Jun 2026 · range 294 – 553
Broadly held

Who Holds MAIN

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: 401 filers, like-for-like change -2.2%; actively managed books -1.7%; index-like books -4.2%.

Holder type Share Filers Change
Registered adviser 52.0% 249 -5.2%
Exempt adviser 3.2% 3 +2.5%
Adviser 4.7% 8 +15.7%
Bank 11.8% 22 +4.8%
Broker-dealer 2.4% 3 -6.5%
Non-US 0.5% 3 +7.7%
Holding company 7.6% 7 -5.1%
Insurer 0.0% 0 —
Unknown 17.7% 106 -1.1%

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 4 holders with no observed 2026-03-31 13F and 3 holders with no observed 2026-06-30 13F.

Conviction and Crowding

401 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
7
1.75% of filers hold it in their top 10
Mar 31, 2026: 8
Holders above 5%
4
median weight 0.009%
Mar 31, 2026: 3
Crowding
9.92%
of shares outstanding, 30th percentile
Mar 31, 2026: 10.8%
Private-fund advisers
9.22%
of shares outstanding
Institutional ownership
24.4%
25.4% of the estimated free float
Top 10 holders
47.7%
of 13F shares, Herfindahl 0.041
Active holders
-1.7%
like-for-like share change of active filers
5% stakes on record
0
0 13D, 0 13G
How long holders have held it value-weighted 18.9 quarters
Under 1 year 8.68% 1 to 3 years 23.0% 3 years or more 68.3% 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
$53.35
estimated per share
Mar 31, 2026: $54.72
Quarter-end price
$51.75
implied by 13F values
Estimated gain or loss
-3.0%
price against the estimated cost
Estimated at a loss
64.0%
of costed 13F value

Estimated cost covers 33.3% 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.

Shared Holders

Companies MAIN's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 HTGC Hercules Capital, Inc. 16
2 CSWC Capital Southwest Corp 11
3 ARCC Ares Capital Corp 22
4 BXSL Blackstone Secured Lending Fund 14
5 XOM ExxonMobil Holdings Corp 65
6 CSCO Cisco Systems, Inc. 62
7 CVX Chevron Corp 60
8 COST Costco Wholesale Corp 61
9 TSLA Tesla, Inc. 60
10 AAPL Apple Inc. 75

Shareholder Targets

13F filers that own its peers but not MAIN, quarter ended Jun 30, 2026

Found through its holder-overlap peers: HTGC, CSWC, ARCC, BXSL, XOM, CSCO, CVX, COST, TSLA, AAPL, GOOGL, MSFT, OBDC, JNJ, NVDA, EPD, AMZN, JPM, HD, WMT. 6,882 filers in all.

# Filer In peers
1 VANGUARD CAPITAL MANAGEMENT LLC Registered adviser, Index-like $1,502,501,116,382 14 held
2 GEODE CAPITAL MANAGEMENT, LLC Registered adviser, Index-like $577,058,077,484 15 held
3 VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser, Diversified active $480,526,308,761 14 held
4 NORGES BANK Non-US, Index-like $319,679,114,733 14 held
5 NORTHERN TRUST CORP Bank, Index-like $245,202,759,380 19 held
6 Capital Research Global Investors Adviser, Diversified active $195,255,202,558 14 held
7 CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser, Diversified active $170,714,935,327 15 held
8 Capital World Investors Adviser, Diversified active $151,575,933,892 13 held
9 VANGUARD FIDUCIARY TRUST CO Unknown, Index-like $131,703,077,400 14 held
10 Amundi Holding company, Index-like $127,381,782,450 15 held

Fund Ownership of MAIN by Fund Type

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

Index funds and index ETFs hold 2.33% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 0.00% 2,051
Index ETFs 2.33% 2,179,675
Active ETFs 0.59% 548,084
Active funds 2.08% 1,943,506
Unclassified 0.00% 160
All registered funds 5.00% 4,673,476
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 248 Exempt adviser 3 Adviser 8 Bank 23 Broker-dealer 3 Non-US 3 Holding company 7 Unknown 105
Showing 100 of 406
All Common Calls Puts
Export CSV
Holder Value (USD) % of 13F Shares Open
PRICE T ROWE ASSOCIATES INC /MD/ $173,408,847 14.20% 3,342,499
VAN ECK ASSOCIATES CORP $97,808,014 8.01% 1,885,274
UBS Group AG $71,995,482 5.90% 1,387,731
Legal & General Group Plc $43,322,757 3.55% 835,057
MORGAN STANLEY $40,792,412 3.34% 786,284
Qube Research & Technologies Ltd $33,938,132 2.78% 654,166
Invesco Ltd. $28,739,807 2.35% 553,967
ADELL HARRIMAN & CARPENTER INC $25,888,016 2.12% 498,998
Muzinich & Co., Inc. $25,728,485 2.11% 495,923
BlackRock, Inc. $20,939,959 1.71% 403,623
Sumitomo Mitsui Trust Group, Inc. $19,481,406 1.60% 375,509
D. E. Shaw & Co., Inc. $19,471,497 1.59% 375,318
LPL Financial LLC $18,033,488 1.48% 347,600
FRANKLIN RESOURCES INC $17,782,544 1.46% 342,763
GOLDMAN SACHS GROUP INC $17,239,257 1.41% 332,291
PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO $14,598,876 1.20% 281,397
SUSQUEHANNA INTERNATIONAL GROUP, LLP $14,054,292 1.15% 270,900
CHILDRESS CAPITAL ADVISORS, LLC $13,371,188 1.10% 257,733
RAYMOND JAMES FINANCIAL INC $12,379,449 1.01% 238,617
SUSQUEHANNA INTERNATIONAL GROUP, LLP $11,496,608 0.94% 221,600
Trinity Legacy Partners, LLC $11,301,746 0.93% 217,844
SANDERS MORRIS HARRIS LLC $10,950,711 0.90% 198,923
Bridgelight Financial Advisors, Inc. $9,256,877 0.76% 168,154
ROYAL BANK OF CANADA $9,068,363 0.74% 174,795
Private Advisor Group, LLC $8,428,580 0.69% 162,463
OSAIC HOLDINGS, INC. $8,416,387 0.69% 162,228
Cambridge Investment Research Advisors, Inc. $7,986,874 0.65% 153,949
Arax Advisory Partners $7,848,095 0.64% 151,274
BENJAMIN EDWARDS INC $7,556,581 0.62% 145,655
TECTONIC ADVISORS LLC $7,545,685 0.62% 145,445
JPMORGAN CHASE & CO $7,360,734 0.60% 141,880
MILLENNIUM MANAGEMENT LLC $6,978,015 0.57% 134,503
WELLS FARGO & COMPANY/MN $6,924,579 0.57% 133,473
Balyasny Asset Management L.P. $6,906,525 0.57% 133,125
TCTC Holdings, LLC $6,884,009 0.56% 132,691
STATE STREET CORP $6,766,967 0.55% 130,435
AMERIPRISE FINANCIAL INC $6,705,022 0.55% 129,241
Joel Isaacson & Co., LLC $6,703,207 0.55% 129,206
HOURGLASS CAPITAL, LLC $6,311,202 0.52% 121,650
BANK OF AMERICA CORP /DE/ $6,093,927 0.50% 117,462
Segment Wealth Management, LLC $5,953,126 0.49% 114,748
Hamilton Point Investment Advisors, LLC $5,899,015 0.48% 113,705
CANADA LIFE ASSURANCE Co $5,884,904 0.48% 113,433
TUDOR INVESTMENT CORP ET AL $5,788,614 0.47% 111,577
Beacon Pointe Advisors, LLC $5,664,569 0.46% 109,186
Meridian Wealth Management, LLC $5,645,010 0.46% 108,809
JANE STREET GROUP, LLC $5,465,660 0.45% 105,352
CONFLUENCE INVESTMENT MANAGEMENT LLC $5,287,552 0.43% 96,050
Naviter Wealth, LLC $5,232,720 0.43% 100,862
J.W. COLE ADVISORS, INC. $5,218,764 0.43% 100,593
BNP PARIBAS ARBITRAGE, SA $5,189,556 0.43% 100,030
Cetera Investment Advisers $5,033,708 0.41% 97,026
DENALI ADVISORS LLC $4,959,261 0.41% 95,591
ALBION FINANCIAL GROUP /UT $4,850,565 0.40% 88,112
HighTower Advisors, LLC $4,813,426 0.39% 92,780
Integrated Wealth Concepts LLC $4,672,105 0.38% 90,056
FIRST TRUST ADVISORS LP $4,630,082 0.38% 89,246
Trexquant Investment LP $4,489,850 0.37% 86,543
CITADEL ADVISORS LLC $4,326,792 0.35% 83,400
Advisors Asset Management, Inc. $4,011,828 0.33% 77,329
Texas Yale Capital Corp. $3,961,712 0.32% 76,363
JANE STREET GROUP, LLC $3,849,496 0.32% 74,200
Creative Planning $3,813,957 0.31% 73,515
Ilex Capital Partners (UK) LLP $3,797,979 0.31% 73,207
Pembroke Management, LTD $3,788,651 0.31% 68,822
JANE STREET GROUP, LLC $3,558,968 0.29% 68,600
Baker Avenue Asset Management, LP $3,450,020 0.28% 66,500
CITADEL ADVISORS LLC $3,439,644 0.28% 66,300
Kestra Advisory Services, LLC $3,228,699 0.26% 62,234
IHT Wealth Management, LLC $3,190,204 0.26% 61,492
Larson Financial Group LLC $3,164,887 0.26% 61,004
COMMONWEALTH EQUITY SERVICES, LLC $3,100,296 0.25% 59,759
Fund Advisors of America Inc/FL $2,996,173 0.25% 57,752
Concurrent Investment Advisors, LLC $2,979,361 0.24% 54,121
Midwest Professional Planners, LTD. $2,965,875 0.24% 57,168
Sound Income Strategies, LLC $2,920,512 0.24% 53,052
HRT FINANCIAL LP $2,912,698 0.24% 56,143
Clear Trail Advisors, LLC $2,843,883 0.23% 51,660
Rockefeller Capital Management L.P. $2,812,725 0.23% 54,216
FJ Capital Management LLC $2,754,049 0.23% 53,085
Focus Financial Network, Inc. $2,741,765 0.22% 49,805
Mariner, LLC $2,717,163 0.22% 52,374
M&T Bank Corp $2,684,790 0.22% 51,750
Taylor Frigon Capital Management LLC $2,631,768 0.22% 50,728
ENVESTNET ASSET MANAGEMENT INC $2,597,112 0.21% 50,060
Russell Investments Group, Ltd. $2,561,263 0.21% 49,369
Prospera Financial Services Inc $2,552,340 0.21% 49,197
Bank of New York Mellon Corp $2,382,224 0.20% 45,918
SUSQUEHANNA INTERNATIONAL GROUP, LLP $2,342,744 0.19% 45,157
Capital Investment Advisors, LLC $2,322,563 0.19% 44,768
NewEdge Advisors, LLC $2,311,669 0.19% 44,558
BARCLAYS PLC $2,285,935 0.19% 44,062
First Financial Bankshares Inc $2,258,907 0.18% 43,541
KING LUTHER CAPITAL MANAGEMENT CORP $2,200,230 0.18% 42,410
ExodusPoint Capital Management, LP $2,098,234 0.17% 40,444
BLAIR WILLIAM & CO/IL $2,006,459 0.16% 38,675
Squarepoint Ops LLC $1,981,141 0.16% 38,187
SHARPEPOINT LLC $1,976,783 0.16% 38,103
Advisory Services Network, LLC $1,962,983 0.16% 37,837
LGT Fund Management Co Ltd. $1,915,980 0.16% 36,931

Showing the top 100 of 406 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 1396440 CUSIP 56035L104 13F (30d) 73 filings 69 filers Visit website Investor relations