Who owns Martin Marietta Materials (MLM)
Which tracked institutional funds hold MLM, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MLM company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
168 tracked funds added or opened MLM while 279 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MLM’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.1% of theirs — a 0.0pp gap the other way — the median holder sizes MLM more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in MLM divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 1012 tracked filers holding MLM, 451 increased or opened the position and 541 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MLM between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 45
- TCI FUND MANAGEMENT LTD$758M
- 59 North Capital Management, LP$123M
- Freestone Grove Partners LP$72M
- Junto Capital Management LP$71M
- Bornite Capital Management LP$38M
- Jupiter Topco LLC$32M
Full exits 83
- T. Rowe Price Investment Management, Inc.$561M
- Amundi$155M
- DekaBank Deutsche Girozentrale$104M
- STEGINSKY CAPITAL LLC$76M
- NATIXIS ADVISORS, LLC$60M
- Lazard Freres Gestion S.A.S.$48M
Largest adds
- BlackRock, Inc.$586M
- GOLDMAN SACHS GROUP INC$149M
- STATE STREET CORP$128M
- VICTORY CAPITAL MANAGEMENT INC$65M
- PRICE T ROWE ASSOCIATES INC /MD/$46M
- NORGES BANK$44M
Largest trims
- FMR LLC$270M
- JPMORGAN CHASE & CO$214M
- MORGAN STANLEY$206M
- CONGRESS ASSET MANAGEMENT CO$105M
- Aristotle Capital Management, LLC$95M
- ALKEON CAPITAL MANAGEMENT LLC$78M
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. added | 4,692,446 | $2.7B | 9.0% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 3,929,705 | $2.3B | 7.5% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 3,197,395 | $1.8B | 6.1% | 2026-Q2 |
| STATE STREET CORP added | 3,159,639 | $1.8B | 6.0% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 2,446,762 | $1.4B | 4.7% | 2026-Q2 |
| FMR LLC trimmed | 2,192,603 | $1.3B | 4.2% | 2026-Q2 |
| PRINCIPAL FINANCIAL GROUP INC added | 2,116,369 | $1.2B | 4.0% | 2026-Q2 |
| Aristotle Capital Management, LLC trimmed | 1,831,597 | $1.1B | 3.5% | 2026-Q2 |
| VICTORY CAPITAL MANAGEMENT INC added | 1,783,432 | $1.0B | 3.4% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,601,490 | $920M | 3.0% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 1,599,324 | $922M | 3.1% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 1,466,887 | $853M | 2.8% | 2026-Q2 |
| TCI FUND MANAGEMENT LTD new | 1,315,109 | $758M | 2.5% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 1,163,330 | $671M | 2.2% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,012,016 | $584M | 1.9% | 2026-Q2 |
| Select Equity Group, L.P. trimmed | 1,011,255 | $583M | 1.9% | 2026-Q2 |
| BAILLIE GIFFORD & CO trimmed | 991,786 | $572M | 1.9% | 2026-Q2 |
| GARDNER RUSSO & QUINN LLC trimmed | 705,367 | $407M | 1.3% | 2026-Q2 |
| KING LUTHER CAPITAL MANAGEMENT CORP trimmed | 653,184 | $377M | 1.2% | 2026-Q2 |
| Invesco Ltd. trimmed | 649,575 | $375M | 1.2% | 2026-Q2 |
| ALKEON CAPITAL MANAGEMENT LLC trimmed | 627,351 | $362M | 1.2% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 586,145 | $338M | 1.1% | 2026-Q2 |
| NORTHERN TRUST CORP trimmed | 570,346 | $329M | 1.1% | 2026-Q2 |
| NORGES BANK trimmed | 557,143 | $321M | 1.1% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 492,536 | $284M | 0.9% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 486,058 | $280M | 0.9% | 2026-Q2 |
| FRANKLIN RESOURCES INC trimmed | 459,327 | $265M | 0.9% | 2026-Q2 |
| CIBC Bancorp USA Inc. trimmed | 390,665 | $226M | 0.7% | 2026-Q2 |
| UBS Group AG added | 390,429 | $225M | 0.7% | 2026-Q2 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 386,046 | $223M | 0.7% | 2026-Q2 |
| Bank of New York Mellon Corp trimmed | 345,624 | $199M | 0.7% | 2026-Q2 |
| D1 Capital Partners L.P. added | 345,060 | $199M | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO trimmed | 337,299 | $195M | 0.6% | 2026-Q2 |
| DAVENPORT & Co LLC trimmed | 336,791 | $195M | 0.6% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 278,806 | $161M | 0.5% | 2026-Q2 |
| Skye Global Management LP trimmed | 252,000 | $145M | 0.5% | 2026-Q2 |
| Legal & General Group Plc trimmed | 249,518 | $144M | 0.5% | 2026-Q2 |
| Mawer Investment Management Ltd. trimmed | 241,545 | $139M | 0.5% | 2026-Q2 |
| HAWK RIDGE CAPITAL MANAGEMENT LP added | 238,655 | $138M | 0.5% | 2026-Q2 |
| GREAT LAKES ADVISORS, LLC added | 226,586 | $131M | 0.4% | 2026-Q2 |
| DEUTSCHE BANK AG\ trimmed | 225,927 | $130M | 0.4% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC trimmed | 222,584 | $128M | 0.4% | 2026-Q2 |
| Douglass Winthrop Advisors, LLC trimmed | 217,073 | $125M | 0.4% | 2026-Q2 |
| 59 North Capital Management, LP new | 214,146 | $123M | 0.4% | 2026-Q2 |
| Diamond Hill Capital Management, LLC (Investment Advisor) trimmed | 213,905 | $123M | 0.4% | 2026-Q2 |
| Findlay Park Partners LLP added | 207,262 | $120M | 0.4% | 2026-Q2 |
| Clearbridge Investments, LLC trimmed | 190,867 | $110M | 0.4% | 2026-Q2 |
| LONDON CO OF VIRGINIA trimmed | 187,051 | $108M | 0.4% | 2026-Q2 |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC trimmed | 181,902 | $105M | 0.3% | 2026-Q2 |
| Nuveen, LLC added | 173,430 | $100M | 0.3% | 2026-Q2 |
| Swiss National Bank trimmed | 169,950 | $98M | 0.3% | 2026-Q2 |
| RDST Capital LLC added | 163,550 | $94M | 0.3% | 2026-Q2 |
| Rathbones Group PLC trimmed | 160,365 | $92M | 0.3% | 2026-Q2 |
| ROYAL BANK OF CANADA trimmed | 157,881 | $91M | 0.3% | 2026-Q2 |
| NOMURA ASSET MANAGEMENT INTERNATIONAL INC. added | 157,083 | $91M | 0.3% | 2026-Q2 |
| ENVESTNET ASSET MANAGEMENT INC trimmed | 151,797 | $88M | 0.3% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 147,387 | $85M | 0.3% | 2026-Q2 |
| Camrose Capital Investment Partners LLP added | 146,170 | $84M | 0.3% | 2026-Q2 |
| MCDONALD CAPITAL INVESTORS INC/CA trimmed | 138,976 | $80M | 0.3% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 136,930 | $79M | 0.3% | 2026-Q2 |
| Sumitomo Mitsui Trust Group, Inc. added | 129,390 | $75M | 0.2% | 2026-Q2 |
| Vanguard Global Advisers, LLC trimmed | 129,228 | $75M | 0.2% | 2026-Q2 |
| FEDERATED HERMES, INC. trimmed | 125,494 | $72M | 0.2% | 2026-Q2 |
| Freestone Grove Partners LP trimmed | 124,262 | $72M | 0.2% | 2026-Q2 |
| Junto Capital Management LP new | 123,546 | $71M | 0.2% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 118,981 | $69M | 0.2% | 2026-Q2 |
| Progeny 3, Inc. | 113,150 | $65M | 0.2% | 2026-Q2 |
| Corient Private Wealth LP added | 111,997 | $65M | 0.2% | 2026-Q2 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC trimmed | 111,220 | $64M | 0.2% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 110,649 | $64M | 0.2% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd added | 109,207 | $63M | 0.2% | 2026-Q2 |
| M.D. Sass, LLC added | 107,511 | $62M | 0.2% | 2026-Q2 |
| BARCLAYS PLC trimmed | 101,852 | $59M | 0.2% | 2026-Q2 |
| National Pension Service added | 95,221 | $55M | 0.2% | 2026-Q2 |
| Quantum Capital Management, LLC / NJ added | 93,716 | $54M | 0.2% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS added | 91,559 | $53M | 0.2% | 2026-Q2 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 90,018 | $52M | 0.2% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 88,562 | $51M | 0.2% | 2026-Q2 |
| Fenimore Asset Management Inc trimmed | 88,146 | $51M | 0.2% | 2026-Q2 |
| Harvey Partners, LLC added | 87,035 | $50M | 0.2% | 2026-Q2 |
| CITIGROUP INC added | 83,747 | $48M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 83,255 | $48M | 0.2% | 2026-Q2 |
| GLENMEDE TRUST CO NA trimmed | 82,181 | $47M | 0.2% | 2026-Q2 |
| Pictet Asset Management Holding SA added | 82,136 | $47M | 0.2% | 2026-Q2 |
| California Public Employees Retirement System trimmed | 79,047 | $46M | 0.2% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 77,015 | $44M | 0.1% | 2026-Q2 |
| TimesSquare Capital Management, LLC added | 73,311 | $42M | 0.1% | 2026-Q2 |
| TD Asset Management Inc trimmed | 71,200 | $41M | 0.1% | 2026-Q2 |
| Mitsubishi UFJ Trust & Banking Corp trimmed | 70,684 | $41M | 0.1% | 2026-Q2 |
| GILDER GAGNON HOWE & CO LLC trimmed | 68,114 | $39M | 0.1% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 67,001 | $39M | 0.1% | 2026-Q2 |
| Bornite Capital Management LP added | 65,200 | $38M | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC trimmed | 64,342 | $37M | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. trimmed | 63,917 | $38M | 0.1% | 2026-Q2 |
| CONGRESS ASSET MANAGEMENT CO trimmed | 60,950 | $35M | 0.1% | 2026-Q2 |
| One Madison Group LLC trimmed | 60,000 | $35M | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 59,516 | $34M | 0.1% | 2026-Q2 |
| Jupiter Topco LLC new | 56,106 | $32M | 0.1% | 2026-Q2 |
| CREDIT AGRICOLE S A added | 55,620 | $32M | 0.1% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC added | 54,131 | $31M | 0.1% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.