Tecogen (TGEN)

Tecogen on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on NYSE, classified by the SEC as air-cond & warm air heatg equip & comm & indl refrig equip.

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1.2M

Short interest

settlement 2026-09-30

7.8

Days to cover

+0.5 days vs prior

24.3%

Short share of volume

2026-10-09

10,063

Fails to deliver

settlement 2026-09-09

Wed 11 Nov

Next earnings

estimated date

Insider flow, 90 days

0 buys, 0 sells

As of 2026-10-09.

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 TGEN is 1,159,159 shares, up 32,375 shares over the last month. Over the last 48 readings it ranged from 971 shares (31 October 2024) to 2,096,647 shares (28 November 2025). At the reported average volume of 149K shares a day that is 7.8 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-09-30	1,159,159	+5.0%	148,920	7.78
2026-09-15	1,104,361	-2.0%	151,608	7.28
2026-08-31	1,126,784	-4.7%	198,471	5.68
2026-08-14	1,182,335	+1.7%	184,573	6.41
2026-07-31	1,162,337	-8.9%	285,890	4.07
2026-07-15	1,275,570	+1.7%	251,488	5.07
2026-06-30	1,254,007	+10.6%	211,523	5.93
2026-06-15	1,133,587	+5.6%	380,083	2.98
2026-05-29	1,073,318	-13.4%	495,941	2.16
2026-05-15	1,238,804	-5.4%	755,532	1.64
2026-04-30	1,309,404	+18.5%	587,992	2.23
2026-04-15	1,104,890	+6.7%	526,671	2.10
2026-03-31	1,036,025	-15.8%	592,421	1.75
2026-03-13	1,230,740	-1.0%	309,720	3.97
2026-02-27	1,243,617	-0.1%	209,202	5.94
2026-02-13	1,244,200	-20.3%	313,638	3.97
2026-01-30	1,561,973	-2.5%	446,919	3.49
2026-01-15	1,601,168	+15.9%	1,004,118	1.59
2025-12-31	1,380,943	-25.2%	816,938	1.69
2025-12-15	1,847,105	-11.9%	419,209	4.41
2025-11-28	2,096,647	+15.0%	562,220	3.73
2025-11-14	1,823,694	+29.7%	723,062	2.52
2025-10-31	1,406,262	+15.2%	886,585	1.59
2025-10-15	1,220,298	-10.0%	996,254	1.22

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 9 October 2026, the short share of TGEN volume is 24.3%, down 19.5 points over the last five sessions. Over the last 30 readings it ranged from 7.1% (23 September 2026) to 62.9% (17 September 2026). The latest reading is 15.2 points below the 30-session average of 39.4%, on 31K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-10-09	8K	31K	24.3%	408
2026-10-08	39K	105K	37.5%	6,085
2026-10-07	54K	111K	49.2%	0
2026-10-06	18K	52K	34.0%	0
2026-10-05	15K	47K	31.4%	0
2026-10-02	23K	51K	43.8%	0
2026-10-01	46K	105K	44.4%	0
2026-09-30	50K	227K	21.8%	0
2026-09-29	89K	168K	52.5%	97
2026-09-28	31K	81K	38.3%	0
2026-09-25	4K	27K	16.8%	0
2026-09-24	24K	41K	59.4%	0
2026-09-23	4K	63K	7.1%	0
2026-09-22	21K	57K	37.0%	951
2026-09-21	38K	97K	38.9%	0
2026-09-18	11K	32K	33.4%	0
2026-09-17	47K	75K	62.9%	0
2026-09-16	14K	27K	50.6%	0
2026-09-15	12K	36K	33.7%	500
2026-09-14	15K	61K	24.0%	0
2026-09-11	23K	43K	54.2%	900
2026-09-10	25K	42K	60.8%	0
2026-09-09	26K	60K	43.7%	0
2026-09-08	53K	128K	41.3%	334
2026-09-04	18K	87K	20.8%	100
2026-09-03	32K	82K	38.7%	1
2026-09-02	10K	24K	42.2%	1,485
2026-09-01	96K	222K	43.1%	22,982
2026-08-31	41K	91K	44.7%	0
2026-08-28	25K	47K	52.3%	0

Fails to deliver

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

As of 9 September 2026, the fails-to-deliver balance in TGEN is 10,063 shares, up 7,676 shares over the last settlement date. Over the last 30 readings it ranged from 7 shares (29 June 2026) to 99,894 shares (14 April 2026).

Settlement	Shares failed	Price	Value
2026-09-09	10,063	$3.23	$33K
2026-08-19	2,387	$3.50	$8K
2026-08-17	610	$3.65	$2K
2026-07-17	66	$3.73	$246
2026-07-02	14,672	$4.93	$72K
2026-06-30	400	$5.23	$2K
2026-06-29	7	$5.17	$36
2026-06-22	12,135	$6.03	$73K
2026-06-17	1,535	$5.67	$9K
2026-06-02	99	$6.86	$679
2026-05-29	1,427	$6.37	$9K
2026-05-18	22,532	$6.52	$147K
2026-05-15	200	$6.22	$1K
2026-05-07	157	$5.35	$840
2026-05-04	17,099	$4.95	$85K
2026-05-01	46,514	$4.78	$222K
2026-04-27	527	$4.29	$2K
2026-04-22	201	$4.45	$894
2026-04-20	17,672	$4.30	$76K
2026-04-14	99,894	$3.63	$363K
2026-04-08	210	$2.62	$550
2026-03-25	812	$2.75	$2K
2026-03-23	5,671	$2.23	$13K
2026-03-20	5,629	$2.18	$12K
2026-03-19	2,498	$2.00	$5K
2026-03-02	6,998	$3.47	$24K
2026-02-05	3,954	$3.60	$14K
2026-01-28	577	$4.25	$2K
2026-01-16	39	$4.99	$195
2026-01-12	546	$4.76	$3K

Insider trades

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

No open-market insider trades were reported for TGEN in the last 90 days. The most recent filings are listed below. Latest filing: Rangesh Abinand (Chief Executive Officer) on 2026-06-26.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-06-26	Rangesh Abinand	Chief Executive Officer	Grant	174K	price not stated in the filing	not stated	174K
2026-06-26	Panora Robert	COO and President	Grant	10K	price not stated in the filing	not stated	10K
2026-06-26	Deschenes Roger P.	CAO	Grant	29K	price not stated in the filing	not stated	29K
2026-06-26	Lafaille Stephen	VP of Business Development	Grant	29K	price not stated in the filing	not stated	29K
2026-06-26	Whiting John Kimball IV	General Counsel & Secretary	Grant	19K	price not stated in the filing	not stated	19K
2026-04-24	Ghoniem Ahmed	Director	Buy	13K	$0.79	$10K	13K
2026-04-13	Hirsch Susan B	Director	Buy	5K	$3.73	$19K	265K
2026-03-27	Lewis Earl	Director	Buy	5K	$2.52	$13K	1.0M
2026-03-27	Hirsch Susan B	Director	Buy	10K	$2.54	$25K	260K
2026-03-26	Lewis Earl	Director	Buy	5K	$2.88	$14K	1.0M
2026-03-23	Whiting John Kimball IV	General Counsel & Secretary	Buy	10K	$2.38	$24K	23K
2026-03-20	Rangesh Abinand	Chief Executive Officer	Buy	3K	$2.30	$7K	67K
2026-03-20	Hatsopoulos John	Director	Option exercise	50K	$0.88	$44K	1.0M
2026-03-20	Deschenes Roger P.	CAO	Buy	10K	$2.23	$22K	53K
2025-07-24	Whiting John Kimball IV	General Counsel & Secretary	Grant	12K	$0.00	$0	13K
2025-07-24	Rangesh Abinand	Chief Executive Officer	Grant	54K	$0.00	$0	64K
2025-07-24	Lafaille Stephen	VP of Business Development	Grant	12K	$0.00	$0	12K
2025-07-24	Deschenes Roger P.	CAO	Grant	18K	$0.00	$0	43K
2025-06-24	PANORA ROBERT A	COO and President	Sell	900	$6.86	$6K	63K
2025-06-23	PANORA ROBERT A	COO and President	Sell	32K	$6.36	$202K	63K
2025-06-23	Lafaille Stephen	VP of Business Development	Sell	10K	$7.25	$73K	400
2025-06-23	Lafaille Stephen	VP of Business Development	X	10K	$1.10	$11K	10K
2025-06-18	PANORA ROBERT A	COO and President	Sell	13K	$5.03	$65K	95K
2025-06-16	PANORA ROBERT A	COO and President	Option exercise	53K	$1.10	$58K	108K
2025-06-16	PANORA ROBERT A	COO and President	Option exercise	30K	$0.71	$21K	56K
2025-06-16	PANORA ROBERT A	COO and President	Option exercise	13K	$0.79	$10K	26K
2025-06-16	PANORA ROBERT A	COO and President	X	53K	$1.10	$58K	165K
2025-06-16	PANORA ROBERT A	COO and President	X	30K	$0.71	$21K	113K
2025-06-16	PANORA ROBERT A	COO and President	X	13K	$0.79	$10K	83K
2025-06-06	Lafaille Stephen	VP of Business Development	Sell	25K	$5.98	$150K	400
2025-06-06	Lafaille Stephen	VP of Business Development	X	25K	$1.10	$28K	25K
2025-06-04	PANORA ROBERT A	COO and President	Sell	31K	$5.00	$155K	13K
2025-06-04	Lafaille Stephen	VP of Business Development	Sell	15K	$5.00	$75K	400
2025-06-04	Lafaille Stephen	VP of Business Development	X	15K	$0.71	$11K	15K
2025-06-03	PANORA ROBERT A	COO and President	Sell	26K	$4.69	$122K	44K
2025-06-03	Lafaille Stephen	VP of Business Development	Sell	10K	$4.88	$49K	400
2025-06-03	Lafaille Stephen	VP of Business Development	X	10K	$0.71	$7K	10K
2025-05-27	PANORA ROBERT A	COO and President	Option exercise	70K	$0.71	$50K	70K
2025-05-06	LEWIS EARL R	Director	X	6K	$1.10	$7K	1.0M
2025-05-06	LEWIS EARL R	Director	X	15K	$1.75	$26K	982K
2025-05-06	LEWIS EARL R	Director	X	13K	$1.20	$15K	995K
2025-05-01	LEWIS EARL R	Director	J	240K	$2.14	$514K	967K
2025-03-03	Lafaille Stephen	VP of Business Development	Buy	400	$2.50	$1K	400
2024-11-22	LEWIS EARL R	Director	X	100K	$0.71	$71K	727K
2024-11-22	LEWIS EARL R	Director	Buy	100K	$0.71	$71K	737K
2024-09-27	HATSOPOULOS JOHN	Director	Buy	10K	$0.84	$8K	989K
2024-09-25	HATSOPOULOS JOHN	Director	Buy	10K	$0.86	$9K	979K
2024-08-19	HATSOPOULOS JOHN	Director	Buy	10K	$0.90	$9K	969K
2024-07-15	LEWIS EARL R	Director	Buy	10K	$0.68	$7K	625K
2024-07-15	LEWIS EARL R	Director	Buy	10K	$0.68	$7K	635K

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

2 holders report 5% or more of TGEN in their latest filing, all on Schedule 13G (passive). The largest reported stake is George McCabe at 5.2% of the class (1,552,232 shares), filed 2026-06-10 for an event on 2026-06-03.

Filed	Form	Holder	Shares	Of class	Event
2026-06-10	13G	George McCabeindividual	1.6M	5.2%	2026-06-03
2026-06-10	13G	Portolan Capital Management, LLCinvestment adviser	1.6M	5.2%	2026-06-03

13F holders

Tracked managers holding TGEN at their latest 13F. JSON

2 of the 30 tracked managers held TGEN at their latest 13F, $1.3M in total at quarter-end prices. Citadel Advisors is the largest at $1.3M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 0 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Citadel Advisors	2026-06-30	242K	$1.3M	0.00%	+95K
D. E. Shaw & Co.	2026-06-30	15K	$80K	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

Tecogen 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 Tecogen (TGEN), SEC CIK 1537435, listed on NYSE, classified by the SEC as air-cond & warm air heatg equip & comm & indl refrig equip. 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 2026-10-09.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-09.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 2026-06-10.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 2026-08-12.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 2026-06-26.JSON and CSV
Company record: EDGAR filing index for CIK 1537435Ticker, 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 air-cond & warm air heatg equip & comm & indl refrig equip

Datasets

Frequently Asked Questions

How much of TGEN is sold short?

1,159,159 shares were held short at the 2026-09-30 settlement, 7.8 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 TGEN's daily short volume?

On 2026-10-09, 7,639 of the 31,481 TGEN shares reported to FINRA were sold short, 24.3% of the day's reported volume. Short volume is a flow for one day, not a position.

Does TGEN have fails to deliver?

The SEC's latest file shows 10,063 TGEN shares failed to deliver at settlement 2026-09-09. Fails are reported per settlement date and published twice a month with a lag.

Are TGEN insiders buying or selling?

No open-market insider trades were reported for TGEN in the last 90 days. The most recent filings are listed below. Latest filing: Rangesh Abinand (Chief Executive Officer) on 2026-06-26.

Who owns 5% or more of TGEN?

Which tracked 13F managers own TGEN?

2 of the 30 tracked 13F managers held TGEN shares at their latest filing, $1.3M in all. The largest: Ken Griffin's Citadel Advisors (242K shares, $1.3M), D. E. Shaw & Co. (15K shares, $80K).

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

Tecogen (TGEN)

Short interest

Daily short volume

Fails to deliver

Insider trades

Large holders (13D and 13G)

13F holders

Tecogen in the regulatory record

Source and updates

How to read it

Other companies the SEC classifies as air-cond & warm air heatg equip & comm & indl refrig equip

Other company pages

Datasets

Frequently Asked Questions