Lucid Diagnostics (LUCD)

Lucid Diagnostics 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 surgical & medical instruments & apparatus.

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13.6M

Short interest

settlement 2026-10-15

5.8

Days to cover

-4.5 days vs prior

66.9%

Short share of volume

2026-11-02

6,962

Fails to deliver

settlement 2026-10-14

Wed 11 Nov

Next earnings

estimated date

Insider flow, 90 days

0 buys, 0 sells

As of 2026-11-02.

Short interest

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

As of 15 October 2026, short interest in LUCD is 13,630,379 shares, up 800,076 shares over the last month. Over the last 48 readings it ranged from 293,070 shares (15 November 2024) to 13,630,379 shares (15 October 2026). The latest reading sits at the top of that range. At the reported average volume of 2.3M shares a day that is 5.8 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-10-15	13,630,379	+1.3%	2,344,243	5.81
2026-09-30	13,455,236	+4.9%	1,303,769	10.32
2026-09-15	12,830,303	+7.9%	1,028,104	12.48
2026-08-31	11,890,023	-7.3%	818,619	14.52
2026-08-14	12,830,666	+5.8%	1,044,682	12.28
2026-07-31	12,130,525	+11.3%	1,462,805	8.29
2026-07-15	10,895,223	+15.6%	1,552,475	7.02
2026-06-30	9,423,985	+26.8%	2,586,394	3.64
2026-06-15	7,430,070	+21.6%	844,177	8.80
2026-05-29	6,109,202	-7.8%	1,054,674	5.79
2026-05-15	6,622,490	+11.4%	866,822	7.64
2026-04-30	5,943,308	-4.6%	960,129	6.19
2026-04-15	6,228,117	+4.9%	729,363	8.54
2026-03-31	5,935,036	+2.4%	565,685	10.49
2026-03-13	5,797,071	-13.8%	696,565	8.32
2026-02-27	6,727,046	-7.4%	783,281	8.59
2026-02-13	7,266,948	+3.6%	814,071	8.93
2026-01-30	7,014,153	+84.7%	4,345,378	1.61
2026-01-15	3,797,518	-20.0%	519,285	7.31
2025-12-31	4,747,257	+10.5%	662,324	7.17
2025-12-15	4,294,863	+8.8%	711,455	6.04
2025-11-28	3,948,288	+30.5%	714,341	5.53
2025-11-14	3,024,898	+3.1%	611,543	4.95
2025-10-31	2,933,483	-20.3%	670,342	4.38
2025-10-15	3,682,727	-31.1%	1,717,065	2.14
2025-09-30	5,342,005	-12.1%	969,285	5.51
2025-09-15	6,076,942	+15.6%	2,181,664	2.79
2025-08-29	5,257,234	-3.9%	973,661	5.40
2025-08-15	5,469,430	+3.6%	568,131	9.63
2025-07-31	5,281,264	+10.3%	962,262	5.49
2025-07-15	4,790,040	-1.3%	1,205,414	3.97
2025-06-30	4,854,331	+193.1%	1,888,974	2.57
2025-06-13	1,656,077	+53.1%	1,041,894	1.59
2025-05-30	1,081,448	-39.2%	1,372,096	1.00
2025-05-15	1,779,213	+33.1%	888,012	2.00
2025-04-30	1,336,989	-16.6%	989,421	1.35
2025-04-15	1,603,011	+17.2%	1,831,350	1.00
2025-03-31	1,368,048	+12.4%	945,724	1.45
2025-03-14	1,217,358	-32.1%	841,940	1.45
2025-02-28	1,792,879	+72.5%	776,927	2.31
2025-02-14	1,039,385	+95.1%	875,662	1.19
2025-01-31	532,700	-1.7%	206,945	2.57
2025-01-15	542,007	+24.9%	231,224	2.34
2024-12-31	433,778	+30.4%	402,593	1.08
2024-12-13	332,726	-21.1%	717,789	1.00
2024-11-29	421,841	+43.9%	548,218	1.00
2024-11-15	293,070	-30.6%	506,427	1.00
2024-10-31	422,417	-61.1%	363,943	1.16

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 2 November 2026, the short share of LUCD volume is 66.9%, up 15.5 points over the last five sessions. Over the last 30 readings it ranged from 34.8% (8 October 2026) to 79.6% (13 October 2026). The latest reading is 8.0 points above the 30-session average of 58.9%, on 667K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-11-02	447K	667K	66.9%	0
2026-10-30	562K	988K	56.9%	0
2026-10-29	1.8M	3.2M	55.0%	184,926
2026-10-28	2.2M	3.4M	63.6%	460,260
2026-10-27	3.0M	5.7M	53.0%	362,081
2026-10-26	16.0M	31.1M	51.5%	374,996
2026-10-23	24.9M	46.0M	54.1%	280,428
2026-10-22	1.1M	1.9M	58.4%	0
2026-10-21	1.8M	2.4M	75.3%	201,348
2026-10-20	2.6M	4.2M	61.5%	256,492
2026-10-19	1.4M	3.1M	43.5%	161,465
2026-10-16	776K	1.2M	67.3%	0
2026-10-15	1.5M	2.4M	63.5%	470,307
2026-10-14	746K	1.1M	68.5%	67,250
2026-10-13	602K	755K	79.6%	0
2026-10-12	568K	1.2M	47.2%	0
2026-10-09	574K	1.1M	53.9%	0
2026-10-08	563K	1.6M	34.8%	0
2026-10-07	669K	1.2M	54.8%	3,774
2026-10-06	654K	979K	66.8%	4,001
2026-10-05	857K	1.2M	69.2%	535
2026-10-02	919K	1.5M	61.4%	156,663
2026-10-01	2.4M	4.4M	55.8%	284,271
2026-09-30	799K	1.2M	64.7%	1,800
2026-09-29	279K	432K	64.5%	0
2026-09-28	228K	448K	50.8%	2
2026-09-25	465K	858K	54.3%	28,992
2026-09-24	391K	656K	59.6%	0
2026-09-23	417K	654K	63.7%	5,036
2026-09-22	522K	1.1M	47.3%	0

Fails to deliver

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

As of 14 October 2026, the fails-to-deliver balance in LUCD is 6,962 shares, down 1,833 shares over the last settlement date. Over the last 30 readings it ranged from 6 shares (31 August 2026) to 85,636 shares (10 September 2026). The latest reading sits at the bottom of that range.

Settlement	Shares failed	Price	Value
2026-10-14	6,962	$0.61	$4K
2026-10-13	8,795	$0.60	$5K
2026-10-06	988	$0.59	$583
2026-09-24	4,347	$0.84	$4K
2026-09-16	38	$0.79	$30
2026-09-15	4,813	$0.78	$4K
2026-09-14	11,364	$0.78	$9K
2026-09-11	20,710	$0.80	$17K
2026-09-10	85,636	$0.82	$70K
2026-09-03	1,861	$0.99	$2K
2026-09-02	13,144	$0.97	$13K
2026-09-01	6,268	$0.98	$6K
2026-08-31	6	$0.99	$6
2026-08-20	8,538	$1.01	$9K
2026-08-19	18	$0.99	$18
2026-08-18	3,075	$0.98	$3K
2026-08-13	10	$0.98	$10
2026-08-10	564	$0.97	$547
2026-08-07	564	$0.95	$536
2026-08-06	3,383	$1.00	$3K
2026-07-20	6,633	$0.95	$6K
2026-07-14	1,288	$0.99	$1K
2026-07-10	32	$0.99	$32
2026-06-26	25,468	$1.04	$26K
2026-06-18	59,363	$0.98	$58K
2026-06-17	59,143	$1.02	$60K
2026-06-16	11,558	$1.00	$12K
2026-06-15	16,297	$0.96	$16K
2026-06-12	1,740	$0.98	$2K
2026-06-10	4,993	$0.99	$5K

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for LUCD in the last 90 days. The most recent filings are listed below. Latest filing: Matheis Dennis (Director) on 2026-05-20.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-05-20	Matheis Dennis	Director	Buy	245K	$1.00	$245K	1.0M
2026-02-20	Matheis Dennis	Director	Grant	123K	$0.00	$0	788K
2026-02-20	White Debra	Director	Grant	123K	$0.00	$0	236K
2026-02-20	Sparks Ronald M	Director	Grant	123K	$0.00	$0	320K
2026-02-20	SOKOLOV JACQUE J	Director	Grant	123K	$0.00	$0	320K
2026-02-20	PALUMBO JOHN R	Director	Grant	123K	$0.00	$0	338K
2026-02-20	MCGRATH DENNIS M	Chief Financial Officer	Grant	470K	$0.00	$0	1.8M
2026-02-20	O'Neil Shaun	President and COO	Grant	620K	$0.00	$0	1.4M
2026-02-20	Lapidus Stanley	Director	Grant	123K	$0.00	$0	337K
2026-02-20	Gordon Michael Adam	General Counsel and Secretary	Grant	300K	$0.00	$0	1.0M
2026-02-20	Cox James L	Director	Grant	123K	$0.00	$0	405K
2026-02-20	Aklog Lishan	Chief Executive Officer	Grant	2.2M	$0.00	$0	3.6M
2025-08-20	Matheis Dennis	Director	Buy	100K	$1.02	$102K	665K
2025-05-22	Matheis Dennis	Director	Buy	33K	$1.32	$44K	350K
2025-05-22	Matheis Dennis	Director	Buy	33K	$1.32	$44K	565K
2025-05-21	Matheis Dennis	Director	Buy	130K	$1.32	$171K	317K
2025-05-21	Matheis Dennis	Director	Buy	130K	$1.32	$171K	532K
2025-05-20	Matheis Dennis	Director	Buy	187K	$1.30	$243K	187K
2025-05-20	Matheis Dennis	Director	Buy	187K	$1.30	$243K	403K
2025-02-20	Sparks Ronald M	Director	Grant	113K	$0.00	$0	197K
2025-02-20	White Debra	Director	Grant	113K	$0.00	$0	113K
2025-02-20	Gordon Michael Adam	General Counsel and Secretary	Grant	300K	$0.00	$0	700K
2025-02-20	MCGRATH DENNIS M	Chief Financial Officer	Grant	300K	$0.00	$0	1.3M
2025-02-20	Cox James L	Director	Grant	113K	$0.00	$0	282K
2025-02-20	Matheis Dennis	Director	Grant	113K	$0.00	$0	163K
2025-02-20	Lapidus Stanley	Director	Grant	113K	$0.00	$0	214K
2025-02-20	SOKOLOV JACQUE J	Director	Grant	113K	$0.00	$0	197K
2025-02-20	Aklog Lishan	Chief Executive Officer	Grant	300K	$0.00	$0	1.5M
2025-02-20	O'Neil Shaun	President and COO	Grant	300K	$0.00	$0	827K
2024-05-07	Aklog Lishan	Chief Executive Officer	Grant	400K	$0.00	$0	1.2M
2024-05-07	MCGRATH DENNIS M	Chief Financial Officer	Grant	400K	$0.00	$0	1.0M
2024-05-07	O'Neil Shaun	President and COO	Grant	400K	$0.00	$0	527K
2024-05-07	Gordon Michael Adam	General Counsel and Secretary	Grant	400K	$0.00	$0	400K
2024-02-15	PAVmed Inc.	TenPercentOwner	Other transaction	3.3M	price not stated in the filing	not stated	31.3M
2024-01-26	PAVmed Inc.	TenPercentOwner	Other transaction	3.3M	$1.40	$4.7M	34.6M
2023-09-26	Lapidus Stanley	Director	Sell	10K	$1.43	$14K	111K
2023-09-26	Lapidus Stanley	Director	Sell	10K	$1.45	$14K	102K
2023-09-26	Lapidus Stanley	Director	Sell	10K	$1.47	$15K	121K
2023-09-25	Lapidus Stanley	Director	Sell	200	$1.43	$286	131K
2023-09-21	Lapidus Stanley	Director	Sell	100	$1.44	$144	132K
2023-09-20	Lapidus Stanley	Director	Sell	3K	$1.45	$5K	132K
2023-09-20	Lapidus Stanley	Director	Sell	412	$1.44	$593	132K
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	1.5M	$1.84	$2.7M	31.3M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	331K	$1.66	$550K	29.8M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	222K	$2.48	$550K	29.5M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	1.1M	$1.84	$2.1M	29.1M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	198K	$2.78	$549K	29.3M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	222K	$2.48	$550K	40.7M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	331K	$1.66	$550K	41.0M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	1.5M	$1.84	$2.7M	42.5M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	198K	$2.78	$549K	40.5M
2022-11-30	PAVmed Inc.	TenPercentOwner	Other transaction	1.1M	$1.84	$2.1M	40.3M
2022-09-20	Lapidus Stanley	Director	Sell	17K	$1.70	$29K	135K
2022-09-20	Lapidus Stanley	Director	Sell	17K	$1.71	$29K	152K
2022-01-07	Aklog Lishan	Chief Executive Officer	Grant	60K	$0.00	$0	624K
2022-01-07	MCGRATH DENNIS M	Chief Financial Officer	Grant	60K	$0.00	$0	624K
2021-10-18	PAVmed Inc.	TenPercentOwner	Buy	571K	$14.00	$8.0M	27.9M
2021-10-18	Sparks Ronald M	Director	Grant	85K	$0.00	$0	85K

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 LUCD in its latest filing, on Schedule 13D (active intent). The holder is PAVmed Inc. at 27.5% of the class (38,816,903 shares), filed 2026-02-09 for an event on 2026-02-03.

Filed	Form	Holder	Shares	Of class	Event
2026-02-09	13D/Ano. 6	PAVmed Inc.corporation	38.8M	27.5%	2026-02-03

13F holders

Tracked managers holding LUCD at their latest 13F. JSON

3 of the 30 tracked managers held LUCD at their latest 13F, $889K in total at quarter-end prices. AQR Capital Management is the largest at $774K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 2 added shares and 1 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
AQR Capital Management	2026-06-30	723K	$774K	0.00%	+488K
Renaissance Technologies	2026-06-30	71K	$76K	0.00%	-428K
Citadel Advisors	2026-06-30	36K	$39K	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

Lucid Diagnostics 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 Lucid Diagnostics (LUCD), SEC CIK 1799011, listed on Nasdaq, classified by the SEC as surgical & medical instruments & apparatus. 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 2026-10-15.JSON and CSV
Daily short volume: FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-11-02.JSON and CSV
Fails to deliver: SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-10-14.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 2026-02-09.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 2026-08-13.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 2026-05-20.JSON and CSV
Company record: EDGAR filing index for CIK 1799011Ticker, 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 surgical & medical instruments & apparatus

Other company pages

Datasets

Frequently Asked Questions

How much of LUCD is sold short?

13,630,379 shares were held short at the 2026-10-15 settlement, 5.8 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 LUCD's daily short volume?

On 2026-11-02, 446,635 of the 667,208 LUCD shares reported to FINRA were sold short, 66.9% of the day's reported volume. Short volume is a flow for one day, not a position.

Does LUCD have fails to deliver?

The SEC's latest file shows 6,962 LUCD shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.

Are LUCD insiders buying or selling?

No open-market insider trades were reported for LUCD in the last 90 days. The most recent filings are listed below. Latest filing: Matheis Dennis (Director) on 2026-05-20.

Who owns 5% or more of LUCD?

Which tracked 13F managers own LUCD?

3 of the 30 tracked 13F managers held LUCD shares at their latest filing, $889K in all. The largest: Cliff Asness's AQR Capital Management (723K shares, $774K), Renaissance Technologies (71K shares, $76K), Ken Griffin's Citadel Advisors (36K shares, $39K).

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