Tsakos Energy Navigation (TEN)

Tsakos Energy Navigation on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders and insider trades. Listed on NYSE, classified by the SEC as deep sea foreign transportation of freight.

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291K

Short interest

settlement 2026-09-30

1.0

Days to cover

unchanged vs prior

53.6%

Short share of volume

2026-10-12

100

Fails to deliver

settlement 2026-09-11

-$735K

Insider flow, 90 days

0 buys, 2 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 TEN is 291,215 shares, up 67,396 shares over the last month. Over the last 48 readings it ranged from 204,453 shares (14 August 2026) to 972,550 shares (15 July 2025). At the reported average volume of 565K shares a day that is 1.0 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	291,215	+1.6%	564,979	1.00
2026-09-15	286,599	+28.1%	507,848	1.00
2026-08-31	223,819	+9.5%	224,347	1.00
2026-08-14	204,453	-37.7%	209,472	1.00
2026-07-31	328,207	+2.7%	195,042	1.68
2026-07-15	319,617	+6.7%	241,191	1.33
2026-06-30	299,678	+1.9%	330,387	1.00
2026-06-15	294,088	-18.3%	302,414	1.00
2026-05-29	360,117	-7.5%	382,909	1.00
2026-05-15	389,199	-10.8%	308,942	1.26
2026-04-30	436,238	-2.9%	268,868	1.62
2026-04-15	449,319	+4.0%	427,544	1.05
2026-03-31	432,110	+44.6%	519,654	1.00
2026-03-13	298,727	-14.9%	908,003	1.00
2026-02-27	350,896	-22.8%	515,131	1.00
2026-02-13	454,518	+20.1%	253,200	1.80
2026-01-30	378,601	-14.3%	311,860	1.21
2026-01-15	441,979	-23.5%	418,616	1.06
2025-12-31	577,811	-28.0%	223,782	2.58
2025-12-15	803,013	+38.8%	219,313	3.66
2025-11-28	578,572	+34.1%	418,382	1.38
2025-11-14	431,469	-15.7%	205,293	2.10
2025-10-31	511,607	+15.3%	244,602	2.09
2025-10-15	443,730	-3.8%	262,836	1.69

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 12 October 2026, the short share of TEN volume is 53.6%, up 6.9 points over the last five sessions. Over the last 30 readings it ranged from 20.4% (25 September 2026) to 62.8% (8 September 2026). The latest reading is 12.5 points above the 30-session average of 41.1%, on 313K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-12	168K	313K	53.6%	1
2026-10-09	57K	105K	54.3%	0
2026-10-08	93K	182K	51.0%	5
2026-10-07	33K	85K	38.6%	0
2026-10-06	85K	161K	52.7%	0
2026-10-05	107K	229K	46.7%	105
2026-10-02	49K	153K	32.1%	0
2026-10-01	47K	135K	34.6%	0
2026-09-30	46K	162K	28.4%	291
2026-09-29	44K	154K	28.9%	0
2026-09-28	70K	223K	31.4%	1,120
2026-09-25	24K	119K	20.4%	0
2026-09-24	54K	189K	28.8%	0
2026-09-23	90K	252K	35.6%	0
2026-09-22	116K	272K	42.7%	213
2026-09-21	111K	265K	42.0%	0
2026-09-18	115K	213K	54.0%	0
2026-09-17	113K	210K	54.0%	0
2026-09-16	132K	288K	45.9%	0
2026-09-15	132K	286K	46.0%	25,266
2026-09-14	126K	324K	39.0%	0
2026-09-11	116K	400K	28.9%	0
2026-09-10	108K	339K	31.9%	1,782
2026-09-09	54K	113K	48.3%	0
2026-09-08	47K	76K	62.8%	0
2026-09-04	29K	80K	35.7%	0
2026-09-03	39K	87K	44.5%	0
2026-09-02	25K	95K	26.5%	0
2026-09-01	33K	63K	52.2%	0
2026-08-31	29K	71K	40.5%	0

Fails to deliver

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

As of 11 September 2026, the fails-to-deliver balance in TEN is 100 shares, up 90 shares over the last settlement date. Over the last 30 readings it ranged from 9 shares (4 August 2026) to 5,900 shares (23 March 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-09-11	100	$44.71	$4K
2026-08-27	10	$40.25	$403
2026-08-04	9	$39.61	$356
2026-07-23	554	$39.45	$22K
2026-07-07	345	$37.86	$13K
2026-07-06	979	$37.37	$37K
2026-06-30	45	$35.76	$2K
2026-06-29	265	$36.72	$10K
2026-06-26	644	$37.68	$24K
2026-06-25	388	$39.14	$15K
2026-06-24	61	$41.15	$3K
2026-06-22	131	$38.29	$5K
2026-06-17	235	$38.52	$9K
2026-05-28	1,488	$40.10	$60K
2026-05-26	409	$42.61	$17K
2026-05-21	389	$44.11	$17K
2026-05-20	389	$42.92	$17K
2026-05-19	389	$42.91	$17K
2026-05-18	400	$42.55	$17K
2026-05-14	726	$42.76	$31K
2026-05-13	2,873	$43.31	$124K
2026-04-17	109	$38.70	$4K
2026-04-09	500	$39.41	$20K
2026-03-24	5,476	$38.04	$208K
2026-03-23	5,900	$35.68	$211K
2026-03-12	30	$37.16	$1K
2026-03-04	237	$36.32	$9K
2026-02-23	200	$31.15	$6K
2026-02-20	394	$30.35	$12K
2026-02-19	5,116	$29.73	$152K

Insider trades

SEC Form 4, newest first. JSON

Insiders at TEN reported 2 open-market sells worth $735K in the last 90 days and no open-market buys. Latest filing: Kosmatos Theoharrys Evgenios (CFO and CAO) on 2026-09-18.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-09-18	Kosmatos Theoharrys Evgenios	CFO and CAO	Sell	10K	$53.00	$530K	15K
2026-08-13	Hatzimichalis Clio	Director	Sell	5K	$41.07	$205K	5K
2026-07-14	Tommasino Nicholas Francis	Director	Sell	2K	$40.06	$100K	3K
2026-07-08	TSAKOS NIKOLAOS	Chief Executive Officer	Gift	500K	$0.00	$0	500K
2026-07-08	TSAKOS NIKOLAOS	Chief Executive Officer	Gift	500K	$0.00	$0	82K
2026-04-29	TSAKOS NIKOLAOS	Chief Executive Officer	Buy	13K	$39.95	$499K	919K
2026-04-28	TSAKOS NIKOLAOS	Chief Executive Officer	Buy	13K	$39.92	$499K	906K

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.

Planned sales (Form 144)

Newest first. JSON

4 Form 144 notices on file for TEN worth $1.4M at the prices reported; 3 in the last 90 days worth $1.3M. Latest: Kosmatos Theoharrys Evgenios filed on 2026-09-21 to sell 10,000 shares ($530K) from 2026-09-18.

Filed	Seller	Shares	Market value	Of outstanding	Sale from	Broker
2026-09-21	Kosmatos Theoharrys EvgeniosCFO and CAO	10K	$530K	0.033%	2026-09-18	Beta Securities SA 29 Alexandras Ave,
2026-09-18	Kosmatos Theoharrys EvgeniosDirector	5K	$530K	0.017%	2026-09-18	Beta Securities SA
2026-08-14	Hatzimichalis ClioDirector	5K	$205K	0.017%	2026-08-13	Beta Securities SA
2026-07-14	Tommasino Nicholas FrancisDirector	2K	$100K	0.008%	2026-07-14	Vanguard Marketing Corporation

Large holders (13D and 13G)

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

No holder on file reports 5% or more of TEN in its latest filing.

Filed	Form	Holder	Shares	Of class	Event
2026-02-17	13G/Ano. 1	CastleKnight Master Fund LPpartnership	1.2M	4.1%	2025-12-31
2026-02-17	13G/Ano. 1	CastleKnight Fund GP LLCother entity	1.2M	4.1%	2025-12-31
2026-02-17	13G/Ano. 1	CastleKnight Management LPinvestment adviser, partnership	1.2M	4.1%	2025-12-31
2026-02-17	13G/Ano. 1	CastleKnight Management GP LLCother entity	1.2M	4.1%	2025-12-31
2026-02-17	13G/Ano. 1	Weitman Capital LLCother entity	1.2M	4.1%	2025-12-31
2026-02-17	13G/Ano. 1	Aaron Weitmanparent holding company, individual	1.2M	4.1%	2025-12-31

13F holders

Tracked managers holding TEN at their latest 13F. JSON

5 of the 30 tracked managers held TEN at their latest 13F, $59.8M in total at quarter-end prices. Two Sigma Investments is the largest at $24.6M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 3 added shares and 2 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Two Sigma Investments	2026-06-30	694K	$24.6M	0.02%	+337K
Renaissance Technologies	2026-06-30	472K	$16.7M	0.02%	+6K
D. E. Shaw & Co.	2026-06-30	203K	$7.2M	0.00%	-142K
Point72 Asset Management	2026-06-30	202K	$7.1M	0.01%	+122K
Millennium Management	2026-06-30	120K	$4.2M	0.00%	-26K

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

Tsakos Energy Navigation 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 Tsakos Energy Navigation (TEN), SEC CIK 1166663, listed on NYSE, classified by the SEC as deep sea foreign transportation of freight. 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 2026-09-11.JSON and CSV
Planned sales: SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2026-09-21.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 2026-02-17.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
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 2026-09-18.JSON and CSV
Company record: EDGAR filing index for CIK 1166663Ticker, 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 deep sea foreign transportation of freight

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Datasets

Frequently Asked Questions

How much of TEN is sold short?

291,215 shares were held short at the 2026-09-30 settlement, 1.0 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 TEN's daily short volume?

On 2026-10-12, 167,758 of the 313,159 TEN shares reported to FINRA were sold short, 53.6% of the day's reported volume. Short volume is a flow for one day, not a position.

Does TEN have fails to deliver?

The SEC's latest file shows 100 TEN shares failed to deliver at settlement 2026-09-11. Fails are reported per settlement date and published twice a month with a lag.

Are TEN insiders buying or selling?

Insiders at TEN reported 2 open-market sells worth $735K in the last 90 days and no open-market buys. Latest filing: Kosmatos Theoharrys Evgenios (CFO and CAO) on 2026-09-18.

Have TEN insiders filed to sell?

Who owns 5% or more of TEN?

No holder on file reports 5% or more of TEN in its latest filing.

Which tracked 13F managers own TEN?

5 of the 30 tracked 13F managers held TEN shares at their latest filing, $59.8M in all. The largest: Two Sigma Investments (694K shares, $24.6M), Renaissance Technologies (472K shares, $16.7M), D. E. Shaw & Co. (203K shares, $7.2M), Steve Cohen's Point72 Asset Management (202K shares, $7.1M), Izzy Englander's Millennium Management (120K shares, $4.2M).

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