Marten Transport (MRTN)

Marten Transport on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as trucking (no local).

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3.2M

Short interest

settlement 2026-09-30

3.3

Days to cover

-3.5 days vs prior

42.3%

Short share of volume

2026-10-12

600

Fails to deliver

settlement 2026-09-14

Thu 15 Oct

Next earnings

estimated date

Insider flow, 90 days

0 buys, 0 sells

As of 2026-10-12.

Short interest

FINRA, twice a month. The newest 24 settlements in the table, 48 in the chart. JSON

As of 30 September 2026, short interest in MRTN is 3,153,388 shares, down 201,892 shares over the last month. Over the last 48 readings it ranged from 620,160 shares (15 October 2024) to 3,565,604 shares (15 September 2026). At the reported average volume of 971K shares a day that is 3.3 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	3,153,388	-11.6%	970,690	3.25
2026-09-15	3,565,604	+6.3%	529,464	6.73
2026-08-31	3,355,280	-1.4%	430,057	7.80
2026-08-14	3,402,397	-3.3%	696,922	4.88
2026-07-31	3,519,434	+0.3%	723,068	4.87
2026-07-15	3,510,635	+7.9%	571,103	6.15
2026-06-30	3,253,266	+4.2%	1,085,724	3.00
2026-06-15	3,122,801	+28.4%	807,814	3.87
2026-05-29	2,432,052	+6.6%	939,173	2.59
2026-05-15	2,282,071	+18.8%	937,981	2.43
2026-04-30	1,920,833	+25.0%	938,317	2.05
2026-04-15	1,536,278	-1.2%	779,883	1.97
2026-03-31	1,554,571	+9.0%	807,944	1.92
2026-03-13	1,425,721	-29.9%	624,613	2.28
2026-02-27	2,032,909	+20.9%	590,990	3.44
2026-02-13	1,681,018	-12.9%	794,083	2.12
2026-01-30	1,929,638	-3.2%	887,869	2.17
2026-01-15	1,993,268	+21.2%	1,206,190	1.65
2025-12-31	1,645,096	+18.8%	669,728	2.46
2025-12-15	1,384,881	+5.4%	870,047	1.59
2025-11-28	1,314,216	-8.1%	662,289	1.98
2025-11-14	1,429,483	+1.8%	571,777	2.50
2025-10-31	1,403,614	-6.4%	933,216	1.50
2025-10-15	1,500,197	+24.7%	608,800	2.46

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 12 October 2026, the short share of MRTN volume is 42.3%, up 4.3 points over the last five sessions. Over the last 30 readings it ranged from 16.3% (16 September 2026) to 73.4% (15 September 2026). The latest reading is 10.7 points below the 30-session average of 53.0%, on 235K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-12	100K	235K	42.3%	0
2026-10-09	175K	413K	42.2%	0
2026-10-08	60K	207K	28.8%	30
2026-10-07	64K	179K	35.9%	92
2026-10-06	80K	191K	41.7%	0
2026-10-05	75K	196K	38.0%	0
2026-10-02	127K	208K	61.1%	0
2026-10-01	138K	214K	64.6%	0
2026-09-30	144K	235K	61.1%	0
2026-09-29	92K	171K	53.6%	0
2026-09-28	95K	185K	51.5%	0
2026-09-25	111K	253K	43.6%	0
2026-09-24	88K	204K	43.0%	0
2026-09-23	90K	216K	41.7%	35
2026-09-22	66K	132K	50.0%	0
2026-09-21	100K	265K	37.8%	4
2026-09-18	133K	244K	54.4%	0
2026-09-17	138K	270K	51.2%	0
2026-09-16	202K	1.2M	16.3%	0
2026-09-15	148K	202K	73.4%	0
2026-09-14	112K	173K	64.9%	0
2026-09-11	77K	107K	72.1%	0
2026-09-10	95K	140K	67.7%	0
2026-09-09	49K	75K	65.9%	0
2026-09-08	85K	118K	72.0%	0
2026-09-04	73K	105K	69.0%	0
2026-09-03	87K	165K	52.9%	13,694
2026-09-02	213K	292K	72.9%	0
2026-09-01	99K	160K	62.2%	0
2026-08-31	98K	166K	59.2%	0

Fails to deliver

SEC, the last 30 settlement dates with a fail. JSON

As of 14 September 2026, the fails-to-deliver balance in MRTN is 600 shares, down 649 shares over the last settlement date. Over the last 30 readings it ranged from 5 shares (3 August 2026) to 39,900 shares (29 June 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-14	600	$13.80	$8K
2026-09-10	1,249	$14.01	$17K
2026-09-08	155	$14.40	$2K
2026-09-04	49	$14.16	$694
2026-08-04	8	$14.91	$119
2026-08-03	5	$14.79	$74
2026-07-08	1,005	$17.24	$17K
2026-06-29	39,900	$17.47	$697K
2026-06-25	28	$16.84	$472
2026-06-24	4,977	$17.15	$85K
2026-06-12	9,232	$18.28	$169K
2026-06-02	1,012	$17.55	$18K
2026-05-28	59	$17.25	$1K
2026-05-15	1,012	$15.55	$16K
2026-05-13	19,267	$14.79	$285K
2026-05-06	626	$14.68	$9K
2026-04-27	9,141	$14.80	$135K
2026-04-24	14	$14.83	$208
2026-04-16	10	$13.75	$138
2026-04-15	714	$14.11	$10K
2026-04-09	211	$14.14	$3K
2026-04-07	957	$13.75	$13K
2026-04-06	475	$13.77	$7K
2026-04-02	455	$13.37	$6K
2026-03-27	7	$12.86	$90
2026-03-20	134	$12.10	$2K
2026-02-17	41	$13.24	$543
2026-02-11	65	$13.57	$882
2026-02-06	6	$13.62	$82
2026-02-03	791	$13.33	$11K

Insider trades

SEC Form 4, newest first, 50 of 100 shown. JSON

No open-market insider trades were reported for MRTN in the last 90 days. The most recent filings are listed below. Latest filing: MARTEN RANDOLPH L (Chairman of the Board and CEO) on 2026-07-30.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-07-30	MARTEN RANDOLPH L	Chairman of the Board and CEO	Gift	1K	$0.00	$0	17.7M
2026-05-05	Phillips Adam Daniel	EVP & Chief Operating Officer	Grant	5K	$0.00	$0	15K
2026-05-05	Petit Douglas Paul	President	Grant	6K	$0.00	$0	41K
2026-05-05	MARTEN RANDOLPH L	Chairman of the Board and CEO	Grant	12K	$0.00	$0	17.7M
2026-05-05	Jones Patricia L	Director	Grant	4K	$0.00	$0	15K
2026-05-05	IVERSON KATHLEEN P	Director	Grant	4K	$0.00	$0	23K
2026-05-05	Hinnendael James J	EVP & Chief Financial Officer	Grant	7K	$0.00	$0	162K
2026-05-05	HAGNESS LARRY B	Director	Grant	4K	$0.00	$0	211K
2026-05-05	DEMOREST ROBERT L	Director	Grant	4K	$0.00	$0	59K
2026-05-05	Booth Ronald Richard	Director	Grant	4K	$0.00	$0	32K
2026-05-05	Baier Randall John	Exec. VP & Chief Tech. Officer	Grant	5K	$0.00	$0	23K
2026-05-05	BAUER JERRY M	Director	Grant	4K	$0.00	$0	185K
2026-02-20	Phillips Adam Daniel	EVP & Chief Operating Officer	Tax withholding	1K	$13.90	$16K	11K
2026-02-20	Petit Douglas Paul	President	Tax withholding	2K	$13.90	$32K	34K
2026-02-20	MARTEN RANDOLPH L	Chairman of the Board and CEO	Tax withholding	5K	$13.90	$65K	17.7M
2026-02-20	Hinnendael James J	Exec. VP and CFO	Tax withholding	3K	$13.90	$40K	155K
2026-02-20	Baier Randall John	Exec. VP & Chief Tech. Officer	Tax withholding	1K	$13.90	$18K	18K
2025-12-24	DEMOREST ROBERT L	Director	Gift	7K	$0.00	$0	55K
2025-08-19	MARTEN RANDOLPH L	Executive Chairman of Board	Gift	2K	$0.00	$0	17.7M
2025-05-06	BAUER JERRY M	Director	Grant	5K	$0.00	$0	181K
2025-05-06	Booth Ronald Richard	Director	Grant	5K	$0.00	$0	28K
2025-05-06	DEMOREST ROBERT L	Director	Grant	5K	$0.00	$0	61K
2025-05-06	HAGNESS LARRY B	Director	Grant	5K	$0.00	$0	206K
2025-05-06	IVERSON KATHLEEN P	Director	Grant	5K	$0.00	$0	19K
2025-05-06	Jones Patricia L	Director	Grant	5K	$0.00	$0	11K
2025-05-06	Baier Randall John	Exec. VP & Chief Tech. Officer	Grant	5K	$0.00	$0	19K
2025-05-06	Hinnendael James J	Exec. VP and CFO	Grant	7K	$0.00	$0	158K
2025-05-06	MARTEN RANDOLPH L	Exec. Chairman of the Board	Grant	14K	$0.00	$0	17.7M
2025-05-06	Petit Douglas Paul	President	Grant	7K	$0.00	$0	36K
2025-05-06	Phillips Adam Daniel	EVP & Chief Operating Officer	Grant	5K	$0.00	$0	12K
2025-05-06	KOHL TIMOTHY M	Chief Executive Officer	Grant	12K	$0.00	$0	291K
2025-04-28	BAUER JERRY M	Director	Buy	20K	$12.88	$258K	176K
2025-03-11	MARTEN RANDOLPH L	Exec. Chairman of the Board	Tax withholding	4K	$14.01	$53K	17.7M
2025-03-11	KOHL TIMOTHY M	Chief Executive Officer	Tax withholding	4K	$14.01	$54K	279K
2025-03-11	Hinnendael James J	Exec. VP and CFO	Tax withholding	2K	$14.01	$34K	151K
2025-03-11	Petit Douglas Paul	President	Tax withholding	2K	$14.01	$25K	30K
2025-03-11	Phillips Adam Daniel	EVP & Chief Operating Officer	Tax withholding	816	$14.01	$11K	7K
2025-03-11	Baier Randall John	Exec. VP & Chief Tech. Officer	Tax withholding	927	$14.01	$13K	14K
2024-10-30	BAUER JERRY M	Director	Buy	10K	$15.81	$158K	156K
2024-08-21	MARTEN RANDOLPH L	Exec. Chairman of the Board	Gift	1K	$0.00	$0	17.7M
2024-07-25	Phillips Adam Daniel	EVP & Chief Operating Officer	Option exercise	5K	$10.87	$49K	12K
2024-07-25	Phillips Adam Daniel	EVP & Chief Operating Officer	Sell	5K	$18.34	$83K	7K
2024-06-12	Petit Douglas Paul	President	Option exercise	5K	$10.87	$49K	36K
2024-06-12	Petit Douglas Paul	President	Sell	5K	$18.22	$82K	32K
2024-05-07	BAUER JERRY M	Director	Grant	4K	$0.00	$0	146K
2024-05-07	Booth Ronald Richard	Director	Grant	4K	$0.00	$0	24K
2024-05-07	DEMOREST ROBERT L	Director	Grant	4K	$0.00	$0	57K
2024-05-07	HAGNESS LARRY B	Director	Grant	4K	$0.00	$0	202K
2024-05-07	IVERSON KATHLEEN P	Director	Grant	4K	$0.00	$0	14K
2024-05-07	Jones Patricia L	Director	Grant	4K	$0.00	$0	7K

Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.

Large holders (13D and 13G)

One row per reporting person with its latest filing, newest first. JSON

1 holder reports 5% or more of MRTN in its latest filing, on Schedule 13G (passive). The holder is Dimensional Fund Advisors LP at 6.0% of the class (4,855,737 shares), filed 2026-01-21 for an event on 2025-12-31.

Filed	Form	Holder	Shares	Of class	Event
2026-07-06	13G/Ano. 3	Nuance Investments LLCinvestment adviser	0	4.9%	2026-04-10
2026-01-30	13G/Ano. 2	The Vanguard Groupinvestment adviser	4.0M	4.9%	2025-12-31
2026-01-21	13G/Ano. 17	Dimensional Fund Advisors LPinvestment adviser	4.9M	6.0%	2025-12-31

13F holders

Tracked managers holding MRTN at their latest 13F. JSON

4 of the 30 tracked managers held MRTN at their latest 13F, $52.1M in total at quarter-end prices. Two Sigma Investments is the largest at $31.8M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 4 added shares and 0 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Two Sigma Investments	2026-06-30	1.8M	$31.8M	0.02%	+401K
Citadel Advisors	2026-06-30	722K	$12.5M	0.00%	+53K
AQR Capital Management	2026-06-30	395K	$6.9M	0.00%	+49K
Millennium Management	2026-06-30	55K	$962K	0.00%	new

Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.

What this page is

Marten Transport in the regulatory record

Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.

Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.

This page follows Marten Transport (MRTN), SEC CIK 799167, listed on Nasdaq, classified by the SEC as trucking (no local). The cross-market tables live on the short interest and insider transactions hubs.

Source and updates

Short interest: FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-12.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-14.JSON and CSV
Large holders: SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-07-06.JSON and CSV
13F holders: SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
Earnings dates: SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-23.JSON and CSV
Insider trades: SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-07-30.JSON and CSV
Company record: EDGAR filing index for CIK 799167Ticker, name and exchange from the SEC's company list, refreshed weekly.
Rate limits: 10 requests a minute without a key, 30 with a free key from a free account.

How to read it

Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.

Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.

Other companies the SEC classifies as trucking (no local)

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Datasets

Frequently Asked Questions

How much of MRTN is sold short?

3,153,388 shares were held short at the 2026-09-30 settlement, 3.3 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.

What is MRTN's daily short volume?

On 2026-10-12, 99,575 of the 235,251 MRTN shares reported to FINRA were sold short, 42.3% of the day's reported volume. Short volume is a flow for one day, not a position.

Does MRTN have fails to deliver?

The SEC's latest file shows 600 MRTN shares failed to deliver at settlement 2026-09-14. Fails are reported per settlement date and published twice a month with a lag.

Are MRTN insiders buying or selling?

No open-market insider trades were reported for MRTN in the last 90 days. The most recent filings are listed below. Latest filing: MARTEN RANDOLPH L (Chairman of the Board and CEO) on 2026-07-30.

Who owns 5% or more of MRTN?

Which tracked 13F managers own MRTN?

4 of the 30 tracked 13F managers held MRTN shares at their latest filing, $52.1M in all. The largest: Two Sigma Investments (1.8M shares, $31.8M), Ken Griffin's Citadel Advisors (722K shares, $12.5M), Cliff Asness's AQR Capital Management (395K shares, $6.9M), Izzy Englander's Millennium Management (55K shares, $962K).

Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.