BioAtla (BCAB)

BioAtla on one page: short interest, daily short volume, fails to deliver, large holders, 13F holders, earnings dates and insider trades. Listed on OTC, classified by the SEC as biological products, (no diagnostic substances).

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73K

Short interest

settlement 2026-10-15

6.3

Days to cover

+5.0 days vs prior

48.1%

Short share of volume

2026-08-28

5,580

Fails to deliver

settlement 2026-10-14

Thu 12 Nov

Next earnings

estimated date

Insider flow, 90 days

0 buys, 0 sells

As of 2026-10-15.

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 BCAB is 72,887 shares, down 21,173 shares over the last month. Over the last 48 readings it ranged from 72,887 shares (15 October 2026) to 6,612,587 shares (30 January 2026). The latest reading sits at the bottom of that range. At the reported average volume of 12K shares a day that is 6.3 days to cover.

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Settlement	Shares short	Change	Avg daily volume	Days to cover
2026-10-15	72,887	-3.5%	11,506	6.33
2026-09-30	75,558	-19.7%	54,698	1.38
2026-09-15	94,060	-53.9%	56,369	1.67
2026-08-31	204,122	+47.0%	169,731	1.20
2026-08-14	138,890	+31.7%	69,412	2.00
2026-07-31	105,433	-14.9%	24,091	4.38
2026-07-15	123,939	-18.4%	64,576	1.92
2026-06-30	151,847	-5.2%	63,351	2.40
2026-06-15	160,104	+8.4%	70,806	2.26
2026-05-29	147,632	-9.2%	42,259	3.49
2026-05-15	162,567	+10.4%	29,605	5.49
2026-04-30	147,268	+30.0%	40,348	3.65
2026-04-15	113,264	-95.2%	68,594	1.65
2026-03-31	2,365,733	+22.9%	1,292,068	1.83
2026-03-13	1,924,850	-5.9%	1,501,556	1.28
2026-02-27	2,045,751	-24.2%	1,871,928	1.09
2026-02-13	2,697,341	-59.2%	3,975,081	1.00
2026-01-30	6,612,587	+39.6%	2,545,992	2.60
2026-01-15	4,737,947	+9.8%	2,528,280	1.87
2025-12-31	4,316,860	-0.6%	2,041,933	2.11
2025-12-15	4,341,741	-29.9%	989,384	4.39
2025-11-28	6,190,599	+29.4%	3,004,374	2.06
2025-11-14	4,783,598	+5.8%	1,196,209	4.00
2025-10-31	4,521,208	+50.7%	1,209,960	3.74
2025-10-15	3,000,731	-29.9%	1,483,723	2.02
2025-09-30	4,282,858	-0.5%	644,023	6.65
2025-09-15	4,306,197	+8.3%	1,384,631	3.11
2025-08-29	3,978,046	-10.3%	742,399	5.36
2025-08-15	4,436,866	+13.2%	420,188	10.56
2025-07-31	3,919,687	-7.8%	957,927	4.09
2025-07-15	4,251,266	+3.0%	614,624	6.92
2025-06-30	4,126,301	+0.1%	490,218	8.42
2025-06-13	4,123,925	-2.7%	773,023	5.33
2025-05-30	4,237,342	-2.3%	284,587	14.89
2025-05-15	4,335,170	+0.9%	561,396	7.72
2025-04-30	4,297,685	+5.9%	571,697	7.52
2025-04-15	4,057,653	-6.3%	464,335	8.74
2025-03-31	4,329,921	+2.5%	613,060	7.06
2025-03-14	4,223,353	+33.0%	781,973	5.40
2025-02-28	3,175,716	-17.1%	946,974	3.35
2025-02-14	3,831,718	-12.5%	1,005,822	3.81
2025-01-31	4,377,924	-13.5%	506,470	8.64
2025-01-15	5,058,815	+15.1%	1,648,697	3.07
2024-12-31	4,395,572	+11.4%	1,691,007	2.60
2024-12-13	3,945,474	-0.9%	483,502	8.16
2024-11-29	3,982,735	-3.8%	899,383	4.43
2024-11-15	4,138,894	-15.0%	1,353,365	3.06
2024-10-31	4,868,885	-7.1%	699,705	6.96

Daily short volume

FINRA Reg SHO, the last 30 sessions. JSON

As of 28 August 2026, the short share of BCAB volume is 48.1%, down 20.6 points over the last five sessions. Over the last 30 readings it ranged from 9.8% (31 July 2026) to 68.8% (21 August 2026). The latest reading is 4.6 points above the 30-session average of 43.5%, on 428K shares reported.

Date	Short volume	Total volume	Short share	Exempt
2026-08-28	206K	428K	48.1%	32,252
2026-08-27	5K	11K	46.8%	0
2026-08-26	5K	10K	49.0%	0
2026-08-25	10K	19K	52.0%	0
2026-08-24	116K	237K	49.1%	95
2026-08-21	38K	56K	68.8%	0
2026-08-20	7K	10K	67.2%	0
2026-08-19	20K	35K	56.7%	0
2026-08-18	6K	15K	41.2%	0
2026-08-17	95K	154K	61.5%	29,385
2026-08-14	39K	97K	39.8%	2,153
2026-08-13	20K	46K	42.7%	0
2026-08-12	20K	41K	48.7%	0
2026-08-11	13K	31K	39.9%	0
2026-08-10	19K	47K	39.7%	1,712
2026-08-07	18K	29K	63.2%	0
2026-08-06	12K	27K	43.0%	0
2026-08-05	14K	31K	43.7%	0
2026-08-04	12K	37K	33.0%	0
2026-08-03	8K	33K	25.4%	0
2026-07-31	1K	10K	9.8%	0
2026-07-30	3K	14K	17.9%	0
2026-07-29	3K	7K	47.4%	0
2026-07-28	2K	12K	16.9%	0
2026-07-27	3K	5K	57.7%	0
2026-07-24	9K	30K	31.3%	0
2026-07-23	8K	18K	43.8%	482
2026-07-22	5K	28K	18.7%	575
2026-07-21	7K	15K	45.6%	0
2026-07-20	3K	6K	56.5%	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 BCAB is 5,580 shares, up 5,480 shares over the last settlement date. Over the last 30 readings it ranged from 1 share (21 August 2026) to 35,333 shares (31 August 2026).

Settlement	Shares failed	Price	Value
2026-10-14	5,580	$1.28	$7K
2026-09-09	100	$1.26	$126
2026-09-02	75	$1.08	$81
2026-09-01	127	$1.69	$215
2026-08-31	35,333	$1.74	$61K
2026-08-21	1	$3.18	$3
2026-08-14	2,425	$3.45	$8K
2026-08-13	6	$3.38	$20
2026-07-31	381	$3.38	$1K
2026-07-30	137	$3.23	$443
2026-07-28	309	$3.40	$1K
2026-07-24	693	$3.46	$2K
2026-07-21	454	$3.70	$2K
2026-07-16	3,549	$4.26	$15K
2026-07-15	1,969	$4.06	$8K
2026-07-13	237	$3.82	$905
2026-07-06	57	$4.19	$239
2026-07-01	780	$4.14	$3K
2026-06-30	1,602	$3.83	$6K
2026-06-29	4,972	$3.68	$18K
2026-06-26	6,023	$3.55	$21K
2026-06-25	5,799	$3.79	$22K
2026-06-23	3,335	$3.62	$12K
2026-06-18	377	$3.55	$1K
2026-06-17	421	$3.45	$1K
2026-06-16	1,438	$3.62	$5K
2026-06-15	4,559	$3.86	$18K
2026-06-12	2,368	$3.56	$8K
2026-06-11	1,568	$3.65	$6K
2026-06-10	2,114	$3.44	$7K

Insider trades

SEC Form 4, newest first. JSON

No open-market insider trades were reported for BCAB in the last 90 days. The most recent filings are listed below. Latest filing: Sievers Eric (Chief Medical Officer) on 2026-08-31.

Date	Insider	Title	Type	Shares	Price	Value	Owned after
2026-08-31	Sievers Eric	Chief Medical Officer	Tax withholding	134	$1.69	$226	11K
2026-08-31	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	259	$1.69	$438	52K
2026-08-31	Vasquez Christian	Chief Financial Officer	Tax withholding	71	$1.69	$120	10K
2026-05-31	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	259	$3.93	$1K	52K
2026-05-31	Vasquez Christian	Chief Financial Officer	Tax withholding	82	$3.93	$322	10K
2026-05-31	Sievers Eric	Chief Medical Officer	Tax withholding	134	$3.93	$527	12K
2026-03-12	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	639	$0.17	$107	53K
2026-03-11	SHORT JAY M PHD	Chief Executive Officer	Grant	430K	$0.00	$0	2.7M
2026-03-11	Vasquez Christian	Chief Financial Officer	Tax withholding	175	$0.17	$30	10K
2026-03-11	Sievers Eric	Chief Medical Officer	Tax withholding	360	$0.17	$61	12K
2026-03-10	Sievers Eric	Chief Medical Officer	Grant	240K	$0.00	$0	599K
2026-03-10	Vasquez Christian	Chief Financial Officer	Grant	240K	$0.00	$0	530K
2026-02-28	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	8K	$0.25	$2K	2.2M
2026-02-28	Vasquez Christian	Chief Financial Officer	Tax withholding	2K	$0.25	$445	290K
2026-02-28	WALDRON RICHARD A	Former Chief Financial Officer	Tax withholding	3K	$0.25	$674	343K
2026-02-28	Sievers Eric	Chief Medical Officer	Tax withholding	3K	$0.25	$776	359K
2025-11-30	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	2K	$0.90	$2K	346K
2025-11-30	Sievers Eric	Chief Medical Officer	Tax withholding	3K	$0.90	$2K	362K
2025-11-30	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	6K	$0.90	$6K	2.2M
2025-11-30	Vasquez Christian	See Remarks	Tax withholding	2K	$0.90	$1K	292K
2025-08-31	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	6K	$0.46	$3K	2.2M
2025-08-31	Vasquez Christian	See Remarks	Tax withholding	2K	$0.46	$713	284K
2025-08-31	Sievers Eric	Chief Medical Officer	Tax withholding	3K	$0.46	$1K	365K
2025-08-31	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	2K	$0.46	$1K	339K
2025-06-18	Moran Susan	Director	Grant	24K	$0.00	$0	52K
2025-06-18	Williams Eddie	Director	Grant	24K	$0.00	$0	60K
2025-06-18	STEINMAN LAWRENCE	Director	Grant	24K	$0.00	$0	78K
2025-06-18	GRAY MARY ANN	Director	Grant	24K	$0.00	$0	77K
2025-06-18	MCBRINN SYLVIA	Director	Grant	24K	$0.00	$0	59K
2025-06-18	Smith Scott Andrew	Director	Grant	24K	$0.00	$0	322K
2025-05-31	Vasquez Christian	See Remarks	Tax withholding	2K	$0.41	$642	285K
2025-05-31	Sievers Eric	Chief Medical Officer	Tax withholding	3K	$0.41	$1K	367K
2025-05-31	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	2K	$0.41	$972	341K
2025-05-31	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	6K	$0.41	$3K	2.3M
2025-03-12	SHORT JAY M PHD	Chief Executive Officer	Grant	431K	$0.00	$0	2.3M
2025-03-11	Sievers Eric	Chief Medical Officer	Grant	175K	$0.00	$0	370K
2025-03-11	WALDRON RICHARD A	Chief Financial Officer	Grant	100K	$0.00	$0	333K
2025-03-11	Vasquez Christian	See Remarks	Grant	85K	$0.00	$0	277K
2025-02-16	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	31K	$0.46	$14K	1.8M
2025-02-15	Vasquez Christian	See Remarks	Tax withholding	7K	$0.46	$3K	192K
2025-02-15	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	11K	$0.46	$5K	233K
2025-02-15	Sievers Eric	Chief Medical Officer	Tax withholding	13K	$0.46	$6K	195K
2024-08-31	Sievers Eric	Chief Medical Officer	Tax withholding	572	$1.77	$1K	208K
2024-08-31	Smith Scott Andrew	Director	Tax withholding	2K	$1.77	$4K	298K
2024-07-31	Sievers Eric	Chief Medical Officer	Tax withholding	572	$1.81	$1K	208K
2024-07-31	Smith Scott Andrew	Director	Tax withholding	2K	$1.81	$4K	300K
2024-06-30	Sievers Eric	Chief Medical Officer	Tax withholding	572	$1.37	$784	209K
2024-06-30	Smith Scott Andrew	Director	Tax withholding	2K	$1.37	$3K	302K
2024-06-13	Moran Susan	Director	Grant	17K	$0.00	$0	29K
2024-06-13	Williams Eddie	Director	Grant	17K	$0.00	$0	37K
2024-06-13	STEINMAN LAWRENCE	Director	Grant	17K	$0.00	$0	55K
2024-06-13	Smith Scott Andrew	Director	Grant	17K	$0.00	$0	305K
2024-06-13	MCBRINN SYLVIA	Director	Grant	17K	$0.00	$0	36K
2024-06-13	GRAY MARY ANN	Director	Grant	17K	$0.00	$0	54K
2024-05-31	Sievers Eric	Chief Medical Officer	Tax withholding	572	$1.51	$864	209K
2024-05-31	Smith Scott Andrew	Director	Tax withholding	2K	$1.51	$3K	288K
2024-04-30	Smith Scott Andrew	Director	Tax withholding	2K	$2.26	$5K	290K
2024-04-30	Sievers Eric	Chief Medical Officer	Tax withholding	572	$2.26	$1K	210K
2024-03-31	Sievers Eric	Chief Medical Officer	Tax withholding	572	$3.44	$2K	210K
2024-03-31	Smith Scott Andrew	Director	Tax withholding	2K	$3.44	$8K	292K
2024-02-29	Sievers Eric	Chief Medical Officer	Tax withholding	572	$2.70	$2K	211K
2024-02-29	Smith Scott Andrew	Director	Tax withholding	2K	$2.70	$6K	295K
2024-02-16	SHORT JAY M PHD	Chief Executive Officer	Grant	417K	$0.00	$0	1.9M
2024-02-15	Sievers Eric	Chief Medical Officer	Grant	122K	$0.00	$0	212K
2024-02-15	Vasquez Christian	See Remarks	Grant	70K	$0.00	$0	186K
2024-02-15	WALDRON RICHARD A	Chief Financial Officer	Grant	106K	$0.00	$0	231K
2024-01-31	Sievers Eric	Chief Medical Officer	Tax withholding	657	$1.92	$1K	90K
2024-01-31	Smith Scott Andrew	Director	Tax withholding	2K	$1.92	$4K	297K
2023-12-31	Sievers Eric	Chief Medical Officer	Tax withholding	555	$2.46	$1K	90K
2023-12-31	Smith Scott Andrew	Director	Tax withholding	2K	$2.46	$4K	299K
2023-12-31	GRAY MARY ANN	Director	Grant	6K	$0.00	$0	37K
2023-12-31	Williams Eddie	Director	Grant	5K	$0.00	$0	20K
2023-12-26	MCBRINN SYLVIA	Director	Buy	4K	$2.33	$9K	15K
2023-12-20	SHORT JAY M PHD	Chief Executive Officer	Buy	50K	$2.14	$107K	1.4M
2023-12-19	Vasquez Christian	See Remarks	Buy	7K	$2.04	$15K	116K
2023-12-19	STEINMAN LAWRENCE	Director	Buy	20K	$2.05	$41K	38K
2023-11-30	Sievers Eric	Chief Medical Officer	Tax withholding	554	$1.77	$981	91K
2023-11-30	Smith Scott Andrew	Director	Tax withholding	2K	$1.77	$3K	301K
2023-10-31	Vasquez Christian	See Remarks	Tax withholding	194	$1.47	$285	101K
2023-10-31	Smith Scott Andrew	Director	Tax withholding	2K	$1.47	$3K	303K
2023-10-31	Sievers Eric	Chief Medical Officer	Tax withholding	555	$1.47	$816	91K
2023-10-31	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	970	$1.47	$1K	125K
2023-10-31	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	3K	$1.47	$4K	1.4M
2023-09-30	Sievers Eric	Chief Medical Officer	Tax withholding	554	$1.70	$942	92K
2023-09-30	Smith Scott Andrew	Director	Tax withholding	2K	$1.70	$3K	304K
2023-09-30	Vasquez Christian	See Remarks	Tax withholding	194	$1.70	$330	101K
2023-09-30	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	970	$1.70	$2K	126K
2023-09-30	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	3K	$1.70	$5K	1.4M
2023-09-30	GRAY MARY ANN	Director	Grant	9K	$0.00	$0	31K
2023-09-30	Williams Eddie	Director	Grant	7K	$0.00	$0	15K
2023-09-08	MCBRINN SYLVIA	Director	Buy	2K	$2.54	$5K	11K
2023-08-31	SHORT JAY M PHD	Chief Executive Officer	Tax withholding	3K	$2.51	$7K	1.4M
2023-08-31	Sievers Eric	Chief Medical Officer	Tax withholding	555	$2.51	$1K	92K
2023-08-31	Smith Scott Andrew	Director	Tax withholding	2K	$2.51	$4K	306K
2023-08-31	Vasquez Christian	See Remarks	Tax withholding	194	$2.51	$487	102K
2023-08-31	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	970	$2.51	$2K	127K
2023-07-31	Vasquez Christian	See Remarks	Tax withholding	194	$2.99	$580	102K
2023-07-31	Smith Scott Andrew	Director	Tax withholding	2K	$2.99	$5K	308K
2023-07-31	Sievers Eric	Chief Medical Officer	Tax withholding	554	$2.99	$2K	93K
2023-07-31	WALDRON RICHARD A	Chief Financial Officer	Tax withholding	970	$2.99	$3K	128K

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

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

Filed	Form	Holder	Shares	Of class	Event
2025-10-15	13G	OPOKA INVESTMENT FUND Conon-US institution	2.8M	4.8%	2025-07-09

13F holders

Tracked managers holding BCAB at their latest 13F. JSON

1 of the 30 tracked managers held BCAB at their latest 13F, $292K in total at quarter-end prices. Millennium Management is the largest at $292K (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 0 cut.

Fund	Quarter	Shares	Value	Of portfolio	Change in shares
Millennium Management	2026-06-30	71K	$292K	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

BioAtla 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 BioAtla (BCAB), SEC CIK 1826892, listed on OTC, classified by the SEC as biological products, (no diagnostic substances). 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 2026-08-28.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 2025-10-15.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 2025-11-13.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 2026-08-31.JSON and CSV
Company record: EDGAR filing index for CIK 1826892Ticker, 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 biological products, (no diagnostic substances)

Other company pages

Datasets

Frequently Asked Questions

How much of BCAB is sold short?

72,887 shares were held short at the 2026-10-15 settlement, 6.3 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 BCAB's daily short volume?

On 2026-08-28, 206,066 of the 428,138 BCAB shares reported to FINRA were sold short, 48.1% of the day's reported volume. Short volume is a flow for one day, not a position.

Does BCAB have fails to deliver?

The SEC's latest file shows 5,580 BCAB shares failed to deliver at settlement 2026-10-14. Fails are reported per settlement date and published twice a month with a lag.

Are BCAB insiders buying or selling?

No open-market insider trades were reported for BCAB in the last 90 days. The most recent filings are listed below. Latest filing: Sievers Eric (Chief Medical Officer) on 2026-08-31.

Who owns 5% or more of BCAB?

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

Which tracked 13F managers own BCAB?

1 of the 30 tracked 13F managers held BCAB shares at their latest filing, $292K in all. The largest: Izzy Englander's Millennium Management (71K shares, $292K).

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