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Martin Marietta Materials

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MLM in the last 90 days

Martin Marietta Materials (MLM) had 5 congress transactions by 1 member and no insider purchases in filings from the last 90 days.

FINRA’s latest report (settlement 15 SEPT 2026) shows 2,906,618 shares held short, 3.5 days to cover, up 7.4% from the report before.

  • Congress: 4 purchases and 1 sale reported, amounts in the bands the law requires.
  • Delay: each filing below shows how many days passed between the trade and its publication. None of this is real-time.

Latest filing on file: 09 SEPT 2026 · FINRA settlement 15 SEPT 2026 · public filings, reported as filed

What the price is doing

$479$598 → $479 · -20% over six months

MLM is down 20%. Short sellers still aren't backing off.

Bets against it — they pay off if the price falls — are up 73% over the same stretch.

$598 STARTAPRMAYJUNJULAUGSEPTOCT09 APR 2026 — Hon. Josh Gottheimer — $15,001 – $50,00028 MAY 2026 — Hon. April McClain Delaney — $1,001 – $15,00017 JUL 2026 — Hon. April McClain Delaney — $1,001 – $15,00020 JUL 2026 — Hon. April McClain Delaney — $1,001 – $15,00024 JUL 2026 — Hon. April McClain Delaney — $15,001 – $50,00019 AUG 2026 — Hon. April McClain Delaney — $1,001 – $15,00025 AUG 2026 — Hon. April McClain Delaney — $250,001 – $500,000NOW $479

Politician activityBoughtSold

Short sellers

11 reports · twice a month

APR 0%15 SEPT +73%APRMAYJUNJULAUGSEPTOCT

Money betting MLM falls. Reported twice a month, and it shows up seven working days late.

Politicians

5 buys · 2 sales

Traded over six months

View activity →

Short sellers

Bets up 73%

Over six months · newest 15 SEPT 2026

See the numbers →

Insiders

Nothing reported

Traded over six months

Quiet Money

Our take on how well MLM holds up when sellers show up.

How it holds up · last 60 trading days

Through 21 SEPT 2026

Mixed

When MLM gets hit lately, it goes both ways.

Lately, MLM holds firm some days and gives way on others.

That's been true for the last 3 trading days.

The last 6 months

ResilientMixedVulnerable
MAYJUNJULAUGSEPT
31 MAR 2026Now · 21 SEPT 2026

What the filings show

What the filings show · last 90 days

2 of 4 sources

-11Balanced

Leaning outBalancedLeaning in

The disclosed money is split, on what has actually been filed. This reads on two of the four sources we track.

Short interest
Short interest rose 18.8% — 2,445,770 to 2,906,618 shares between 15 JUL 2026 and 15 SEPT 2026. See the filings →
-47
Congress
1 member of Congress disclosed 4 purchases and 1 sale. See the filings →
+60

This summarises filings that have already been published — it is not a forecast, a rating of the company, or advice. Every figure above is listed in full further down this page, with the document it came from.

FINRA short interest

Settlement 15 SEPT 2026 · shares held short

2,906,618shares held short

Days to cover

3.46

Avg daily volume

838,879

Since last report

+7.38%

As of 15 September 2026, 2,906,618 Martin Marietta Materials shares were held short — the total across every reporting firm, not one fund's position. That is 199,836 shares more than the previous report, a 7.38% increase. At the average daily volume of 838,879 shares, that position represents 3.46 days of trading — what the filing calls days to cover.

This is the most recent figure that exists, and it is 17 days old. FINRA collects short interest twice a month, on a settlement date, and publishes it about eight business days later. So nobody has a live short-interest number for MLM — not us, and not anyone quoting one. We print the settlement date on the figure so you always know which day you are looking at.

Across the 12 reports we hold, the position has risen from 1,890,998 shares on 31 March 2026 to 2,906,618 today, a change of 53.7%. The highest reading in that window was 2,906,618 shares on 15 September 2026.

SettlementShares shortDays to cover
15 SEPT 20262,906,6183.46
31 AUG 20262,706,7824.36
14 AUG 20262,262,4034.71
31 JUL 20262,380,6333.67
15 JUL 20262,445,7704.22
30 JUN 20262,229,1873.02
15 JUN 20262,160,9464.27
29 MAY 20262,215,3053.36
15 MAY 20261,664,1803.47
30 APR 20261,439,4132.76
15 APR 20261,677,0134.96
31 MAR 20261,890,9983.37
What is MLM's short interest?
2,906,618 shares, as of the 15 September 2026 settlement date. That is the figure FINRA published, unadjusted.
What percentage of the float is short?
We do not publish that, because FINRA does not publish float. The regulator reports the number of shares held short; turning it into a percentage needs a share count from somewhere else, and different sources disagree about what counts as float. We would rather give you the number that was actually filed than a percentage built on an assumption.
How current is this?
It is 17 days old, and that is as fresh as short interest gets. FINRA measures it twice a month and publishes it seven business days after the settlement date. Any site showing you a "live" short interest figure is showing you something else.
What does days to cover mean?
It is the short position divided by average daily trading volume — here, 3.46. It describes how many days of ordinary trading the position is equivalent to. It is arithmetic from the filing, not a prediction about what will happen.
Where does this come from?
FINRA's consolidated short interest file, which is public. We read it directly and store it unchanged, except that we blank the days-to-cover placeholder FINRA writes when a stock has almost no volume.

Disclosed insider buying on file

—no purchase on file passed the price check

Open-market purchases only — the amount is a fact, not a verdict.

On file here

Short positions0

Insider purchases0

Congress transactions14

Latest change09 SEPT 2026

SHORT POSITIONS · 0INSIDER BUYS · 0CONGRESS · 14

Congress transactions on file

14 disclosed · newest first · every row links to its filing

WhoAmount as filedTradedFiledLag
Hon. April McClain DelaneyBOUGHT$1,001 – $15,00019 AUG 202609 SEPT 202621 days
Hon. April McClain DelaneySOLD$250,001 – $500,00025 AUG 202609 SEPT 202615 days
Hon. April McClain DelaneyBOUGHT$1,001 – $15,00017 JUL 202603 AUG 202617 days
Hon. April McClain DelaneyBOUGHT$15,001 – $50,00024 JUL 202603 AUG 202610 days
Hon. April McClain DelaneyBOUGHT$1,001 – $15,00020 JUL 202603 AUG 202614 days
Hon. April McClain DelaneyBOUGHT$1,001 – $15,00028 MAY 202605 JUN 20268 days
Hon. Josh GottheimerSOLD$15,001 – $50,00009 APR 202619 MAY 202640 days
Hon. April McClain DelaneyBOUGHT$1,001 – $15,00009 MAR 202606 APR 202628 days
Hon. April McClain DelaneyBOUGHT$1,001 – $15,00002 DEC 202505 JAN 202634 days
Hon. Valerie HoyleSOLD$1,001 – $15,00023 SEPT 202510 OCT 202517 days
Hon. Valerie HoyleBOUGHT$1,001 – $15,00029 OCT 202412 SEPT 2025318 days — the law says 45
Hon. April McClain DelaneySOLD$1,001 – $15,000 · partial01 AUG 202502 SEPT 202532 days
Hon. Lisa McClainSOLD$1,001 – $15,00010 JUN 202513 AUG 202564 days — the law says 45
Hon. Lisa McClainBOUGHT$1,001 – $15,00011 DEC 202413 AUG 2025245 days — the law says 45
What this page will never showNo price targetsNo score out of 100No buy or sell callsNo predictionsDocuments, dates, and how late they were.