Monitor future 13G filings to see if Vanguard continues to reduce its position; a drop below 5% would remove the filing obligation and could signal further unwinding. No immediate catalyst from this routine index rebalancing adjustment.
Price Chart
Executive Summary
Vanguard Portfolio Management LLC filed an amended Schedule 13G disclosing a 4.65% passive stake in Martin Marietta Materials as of September 30, 2026, down from the 6.41% stake previously reported by Vanguard Capital Management LLC in an earlier filing. The reduction is routine for a large index/asset manager and does not signal activist intent.
Key Financial Metrics
Key Facts
- Vanguard Portfolio Management LLC reported beneficial ownership of 3,304,239 shares of Martin Marietta Materials common stock as of September 30, 2026.
- The stake represents 4.65% of shares outstanding, a decrease from the 6.41% stake previously disclosed by Vanguard Capital Management LLC.
- The filing is an amendment to Schedule 13G, confirming passive investment intent under Rule 13d-1(b).
- The filer certifies the securities were acquired and held in the ordinary course of business, not for changing or influencing control.
Financial Impact
Stake reduction from 6.41% to 4.65% of shares outstanding; no dollar value stated in the filing.
Risk Factors
- Continued selling by a major passive holder could indicate broader index-driven rebalancing, but no active bearish signal is present.
- No material financial data or corporate events accompany this filing.
Market Snapshot
Investment Themes
Documents Analyzed
This report is based on 3 SEC documents filed with EDGAR.
| Document | Accession Number |
|---|---|
| SC 13G/A Filing (Primary) | 0002100121-26-001086 |
| Document: 0002100121-26-001086-index.html | 0002100121-26-001086 |
| Document: 0002100121-26-001086.txt | 0002100121-26-001086 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 30, 2026 2d ago | SC 13G/A | $535.91 | awaiting T+5 | awaiting T+5 | $540.41 (+0.84%) |
Oct 30, 2026 2d ago | SC 13G/A | $537.10 | awaiting T+5 | awaiting T+5 | $540.41 (+0.62%) |
Oct 21, 2026 11d ago | Press Release | $517.67 | awaiting T+5 | awaiting T+5 | $540.41 (+4.39%) |
Oct 21, 2026 11d ago | Institutional Cluster | $517.67 $534.39 | ▼ −3.23% | ▼ −2.52% | $540.41 (−4.39%) |
Aug 24, 2026 9w ago | 8-K | $533.11 $518.70 | ▼ −2.70% | ▼ −3.17% | $540.41 (+1.37%) |
Aug 18, 2026 10w ago | 8-K | $535.53 $532.18 | ▼ −0.63% | ▼ −0.24% | $540.41 (+0.91%) |
Aug 14, 2026 11w ago | 8-K | $538.66 $533.11 | ▼ −1.03% | ▲ +0.16% | $540.41 (+0.32%) |
Aug 12, 2026 11w ago | 8-K | $544.76 $525.27 | ▼ −3.58% | ▼ −1.61% | $540.41 (−0.80%) |
Aug 10, 2026 11w ago | 424B5 | $549.54 $538.66 | ▼ −1.98% | ▼ −1.93% | $540.41 (−1.66%) |
Aug 10, 2026 11w ago | 8-K | $549.54 $538.66 | ▼ −1.98% | ▼ −1.93% | $540.41 (−1.66%) |
US Market Status
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