GARDNER RUSSO & QUINN LLC: MARTIN MARIETTA MATLS INC (MLM): Quarterly 13F Position History
As of Q1 2026, GARDNER RUSSO & QUINN LLC reported 715,411 shares of MARTIN MARIETTA MATLS INC (MLM), worth $421.1M and representing 5.0% of its 13F equity book. Quarter-over-quarter share count change: 11,201 (-1.5%) . The position first appeared in Q1 2016 and has been disclosed across 41 13F-HR filings in Pactolio's tracked window.
- 715,411Shares Held (Latest Filing)
- $421.1MReported Market Value (Latest Filing)
- 5.0%Portfolio Weight (% of 13F Equity Book)
- 11,201Quarter-over-Quarter Share Change
- -$31.3MQuarter-over-Quarter Value Change
- 2,103,643Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 41 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 715,411 | 11,201 | -1.5% | $421.1M | 5.0% | $588.7 |
| Q4 2025 | 726,612 | +39,075 | +5.7% | $452.4M | 4.9% | $622.7 |
| Q3 2025 | 687,537 | 25,242 | -3.5% | $433.3M | 4.6% | $630.3 |
| Q2 2025 | 712,779 | 1,473 | -0.2% | $391.3M | 4.2% | $549.0 |
| Q1 2025 | 714,252 | +7,242 | +1.0% | $341.5M | 3.8% | $478.1 |
| Q4 2024 | 707,010 | 43,062 | -5.7% | $365.2M | 4.1% | $516.5 |
| Q3 2024 | 750,072 | 13,987 | -1.8% | $403.7M | 4.1% | $538.2 |
| Q2 2024 | 764,059 | 23,421 | -3.0% | $414.0M | 4.4% | $541.8 |
| Q1 2024 | 787,480 | 153,088 | -16.3% | $483.5M | 5.0% | $613.9 |
| Q4 2023 | 940,568 | 18,195 | -1.9% | $469.3M | 4.8% | $498.9 |
| Q3 2023 | 958,763 | 14,757 | -1.5% | $393.6M | 4.3% | $410.5 |
| Q2 2023 | 973,520 | 27,818 | -2.8% | $449.5M | 4.4% | $461.7 |
| Q1 2023 | 1,001,338 | 9,065 | -0.9% | $355.5M | 3.7% | $355.1 |
| Q4 2022 | 1,010,403 | 57,380 | -5.4% | $341.5M | 3.8% | $338.0 |
| Q3 2022 | 1,067,783 | 12,044 | -1.1% | $343.9M | 4.2% | $322.1 |
| Q2 2022 | 1,079,827 | 13,144 | -1.2% | $323.1M | 3.6% | $299.2 |
| Q1 2022 | 1,092,971 | 75,707 | -6.5% | $420.7M | 4.0% | $384.9 |
| Q4 2021 | 1,168,678 | 23,619 | -2.0% | $514.8M | 4.6% | $440.5 |
| Q3 2021 | 1,192,297 | 43,478 | -3.5% | $407.4M | 3.8% | $341.7 |
| Q2 2021 | 1,235,775 | 34,775 | -2.7% | $434.8M | 3.7% | $351.8 |
| Q1 2021 | 1,270,550 | 125,283 | -9.0% | $426.7M | 3.9% | $335.8 |
| Q4 2020 | 1,395,833 | 105,105 | -7.0% | $396.4M | 3.6% | $284.0 |
| Q3 2020 | 1,500,938 | 62,998 | -4.0% | $353.3M | 3.4% | $235.4 |
| Q2 2020 | 1,563,936 | 85,880 | -5.2% | $323.1M | 3.3% | $206.6 |
| Q1 2020 | 1,649,816 | 37,438 | -2.2% | $312.2M | 3.2% | $189.2 |
| Q4 2019 | 1,687,254 | 50,423 | -2.9% | $471.8M | 3.6% | $279.6 |
| Q3 2019 | 1,737,677 | 56,773 | -3.2% | $476.3M | 3.7% | $274.1 |
| Q2 2019 | 1,794,450 | 58,720 | -3.2% | $412.9M | 3.1% | $230.1 |
| Q1 2019 | 1,853,170 | 91,767 | -4.7% | $372.8M | 2.9% | $201.2 |
| Q4 2018 | 1,944,937 | 42,343 | -2.1% | $334.3M | 2.8% | $171.9 |
| Q3 2018 | 1,987,280 | 3,908 | -0.2% | $361.6M | 2.6% | $182.0 |
| Q2 2018 | 1,991,188 | 24,410 | -1.2% | $444.7M | 3.2% | $223.3 |
| Q1 2018 | 2,015,598 | +3,841 | +0.2% | $417.8M | 2.9% | $207.3 |
| Q4 2017 | 2,011,757 | 22,394 | -1.1% | $444.7M | 3.1% | $221.0 |
| Q3 2017 | 2,034,151 | +268,198 | +15.2% | $419.5M | 3.0% | $206.2 |
| Q2 2017 | 1,765,953 | 13,719 | -0.8% | $393.1M | 2.9% | $222.6 |
| Q1 2017 | 1,779,672 | 34,667 | -1.9% | $388.4M | 3.0% | $218.2 |
| Q4 2016 | 1,814,339 | 254,997 | -12.3% | $401.9M | 3.4% | $221.5 |
| Q3 2016 | 2,069,336 | 16,222 | -0.8% | $370.6M | 3.1% | $179.1 |
| Q2 2016 | 2,085,558 | 18,085 | -0.9% | $400.4M | 3.4% | $192.0 |
| Q1 2016 | 2,103,643 | — | — | $335.6M | 2.8% | $159.5 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did GARDNER RUSSO & QUINN LLC first disclose a MLM position in 13F-HR filings?
GARDNER RUSSO & QUINN LLC first reported MARTIN MARIETTA MATLS INC (MLM) on its 13F-HR filing for the period ending 2016-03-31 (Q1 2016). The position has appeared on 41 reported quarters within Pactolio's tracked window.
What was GARDNER RUSSO & QUINN LLC's most recent quarter-over-quarter share-count change in MLM?
Between Q4 2025 and Q1 2026, GARDNER RUSSO & QUINN LLC reduced its MLM position by 11,201 shares (-1.5%), leaving 715,411 shares at a market value of $421.1M.
Does the implied price-per-share represent GARDNER RUSSO & QUINN LLC's cost basis in MLM?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.