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MRTN · Marten Transport Ltd

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$14.73 -0.10 (-0.67%) At close · Aug 20
Market Cap
$1.21B
Shares
81.66M

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.

Holders: 229
Total Value: $1,064,542,735
Total Shares: 61,357,150

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 229 13F filers · Δ vs Mar 31, 2026
Top Holder
16.4%
Sep 2023 → Jun 2026 · range 15.0% – 17.0%
−0.4 pts
Top 5
37.9%
Sep 2023 → Jun 2026 · range 37.9% – 49.7%
−4.5 pts
Top 10
54.2%
Sep 2023 → Jun 2026 · range 54.2% – 66.1%
−3.6 pts
HHI
503
Sep 2023 → Jun 2026 · range 503 – 628
Broadly held−52

Quarterly Activity

vs Mar 31, 2026
New
40
Increased
79
Decreased
75
Sold Out
37
Unchanged
35
Holder count: +3
Institutional value: +39.5%
Shares held: +5.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 232
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 799167 CUSIP 573075108 13F (30d) 205 filings 205 filers Visit website