Vault-13

BIOATLA INC BCAB

COM · Common Stock · CUSIP 09077B104

34 institutional holders -7 vs Q4 2025
15,379,48315.4m shares reported held*
$2.5mreported value*
5 new 8 added 8 reduced 13 sold out net bought ≈ $355.5k (+2.2m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once. Holder counts are more reliable. Implied quarter-end price ≈ $0.16. Options: 3 managers hold calls ($17.5k notional), 1 hold puts ($32).

Trends to Q1 2026

Institutional holders

Managers reporting a position, each quarter

050100Q3 22: 74Q4 22: 92Q1 23: 82Q2 23: 88Q3 23: 83Q4 23: 80Q1 24: 85Q2 24: 81Q3 24: 66Q4 24: 68Q1 25: 44Q2 25: 40Q3 25: 43Q4 25: 41Q1 26: 3434Q3 22Q3 23Q3 24Q3 25Q1 26
Numbers
QuarterHolders
Q3 202274
Q4 202292
Q1 202382
Q2 202388
Q3 202383
Q4 202380
Q1 202485
Q2 202481
Q3 202466
Q4 202468
Q1 202544
Q2 202540
Q3 202543
Q4 202541
Q1 202634

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
1000100Q2 24: 41 bought or addedQ2 24: 58 cut or sold outQ3 24: 22 bought or addedQ3 24: 54 cut or sold outQ3 24Q4 24: 33 bought or addedQ4 24: 39 cut or sold outQ1 25: 16 bought or addedQ1 25: 41 cut or sold outQ1 25Q2 25: 13 bought or addedQ2 25: 20 cut or sold outQ3 25: 21 bought or addedQ3 25: 11 cut or sold outQ3 25Q4 25: 21 bought or addedQ4 25: 13 cut or sold outQ1 26: 13 bought or addedQ1 26: 21 cut or sold outQ1 26
Numbers
QuarterBought or addedCut or sold out
Q2 20244158
Q3 20242254
Q4 20243339
Q1 20251641
Q2 20251320
Q3 20252111
Q4 20252113
Q1 20261321

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$20k$40k$60kQ2 25 calls: $12.8kQ2 25 puts: $0Q2 25P/C 0.00Q3 25 calls: $48.8kQ3 25 puts: $0Q3 25P/C 0.00Q4 25 calls: $6.8kQ4 25 puts: $340Q4 25P/C 0.05Q1 26 calls: $17.5kQ1 26 puts: $32Q1 26P/C 0.00
Numbers
QuarterCallsPutsP/C
Q2 2025$12.8k$00.00
Q3 2025$48.8k$00.00
Q4 2025$6.8k$3400.05
Q1 2026$17.5k$320.00

Biggest buyers

MILLENNIUM MANAGEMENT LLC Added +1,994,280+2.0m
ACORN CAPITAL ADVISORS, LLC Added +571,234+571.2k
ACADIAN ASSET MANAGEMENT LLC Added +476,248+476.2k
CITADEL ADVISORS LLC New +435,675+435.7k
GEODE CAPITAL MANAGEMENT, LLC Added +188,854+188.9k
UBS Group AG Added +149,885+149.9k
Stonepine Capital Management, LLC New +65,387+65.4k
ADAR1 Capital Management, LLC Added +45,000+45.0k
Kestra Advisory Services, LLC New +44,250+44.2k
StoneX Group Inc. New +29,466+29.5k

Biggest sellers

MARSHALL WACE, LLP Sold out -891,580-891.6k
JANE STREET GROUP, LLC Reduced -323,632-323.6k
RENAISSANCE TECHNOLOGIES LLC Reduced -196,700-196.7k
TWO SIGMA INVESTMENTS, LP Sold out -81,330-81.3k
PVG ASSET MANAGEMENT CORP Sold out -69,000-69.0k
Virtu Financial LLC Sold out -55,460-55.5k
HRT FINANCIAL LP Sold out -54,742-54.7k
SIMPLEX TRADING, LLC Reduced -46,490-46.5k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced -42,631-42.6k
COLUMBIA ADVISORY PARTNERS LLC Sold out -26,070-26.1k

Biggest calls

JANE STREET GROUP, LLC New $11.3k70.2k shares
CITADEL ADVISORS LLC Added $6.1k37.9k shares
SIMPLEX TRADING, LLC Added $144900 shares

Biggest puts

SIMPLEX TRADING, LLC Reduced $32200 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Major shareholders (over 5%)

Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.

HolderStakeChangeShares Last filed
ACORN BIOVENTURES, L.P. 13G · passive investor filed 2025-05-20 8.3% 4.8m 2025-05-20
HIGHBRIDGE CAPITAL MANAGEMENT LLC 13G · institution -2.2 pts · filed 2025-04-25 7.7% -2.2 pts 4.8m 2025-04-25
SHORT JAY M PHD 13G · exempt (held before listing) filed 2025-02-07 6.6% 3.9m 2025-02-07

Insider purchases and sales in Q1 2026

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

None reported in Q1 2026.

Holders, Q1 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 ACORN CAPITAL ADVISORS, LLC 0.25% of their portfolio NEW YORK, NY 5,406,3455.4m $865.0k $865.0k 0.25% Added +571.2k +571,234
2 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 2,756,6742.8m $443.8k $443.8k 0.00% Added +2.0m +1,994,280
3 VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio MALVERN, PA 1,649,2521.6m $265.5k $265.5k 0.00% First filing
4 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 1,233,9191.2m $198.0k $198.0k 0.00% Added +476.2k +476,248
5 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 689,182689.2k $111.0k $111.0k 0.00% Added +188.9k +188,854
6 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 525,352525.4k $84.1k $84.1k 0.00% Reduced -1 -1
7 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 510,514510.5k $82.2k $82.2k 0.00% Reduced -196.7k -196,700
8 BlackRock, Inc. 0.00% of their portfolio New York, NY 480,931480.9k $77.4k $77.4k 0.00% Reduced -2 -2
9 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 435,675435.7k $70.1k $70.1k 0.00% New
10 UBS Group AG 0.00% of their portfolio ZURICH, V8 375,569375.6k $60.5k $60.5k 0.00% Added +149.9k +149,885
11 VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio MALVERN, PA 273,427273.4k $44.0k $44.0k 0.00% First filing
12 ADAR1 Capital Management, LLC 0.00% of their portfolio AUSTIN, TX 228,107228.1k $36.7k $36.7k 0.00% Added +45.0k +45,000
13 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 151,377151.4k $24.4k $24.4k 0.00% Unchanged
14 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 103,494103.5k $16.7k $16.7k 0.00% Unchanged
15 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 73,90173.9k $11.9k $11.9k 0.00% Reduced -46.5k -46,490
16 Stonepine Capital Management, LLC 0.01% of their portfolio Bend, OR 65,38765.4k $10.5k $10.5k 0.01% New
17 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 56,61456.6k $9.1k $9.1k 0.00% Reduced -3.8k -3,781
18 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 55,42655.4k $8.9k $8.9k 0.00% Added +11.8k +11,773
19 MAI Capital Management 0.00% of their portfolio INDEPENDENCE, OH 51,50451.5k $8.3k $8.3k 0.00% Unchanged
20 Kestra Advisory Services, LLC 0.00% of their portfolio AUSTIN, TX 44,25044.2k $7.1k $7.1k 0.00% New
21 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 39,05639.1k $6.3k $6.3k 0.00% Reduced -42.6k -42,631
22 StoneX Group Inc. 0.00% of their portfolio NEW YORK, NY 29,46629.5k $4.7k $4.7k 0.00% New
23 COMMONWEALTH EQUITY SERVICES, LLC 0.00% of their portfolio WALTHAM, MA 25,30025.3k $4.1k $4.1k 0.00% Unchanged
24 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 23,14223.1k $3.7k $3.7k 0.00% Reduced -323.6k -323,632
25 Magnus Financial Group LLC 0.00% of their portfolio NEW YORK, NY 20,00020.0k $3.2k $3.2k 0.00% Unchanged
26 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 16,99617.0k $2.7k $2.7k 0.00% Added +11.7k +11,678
27 Vanguard Global Advisers, LLC 0.00% of their portfolio MALVERN, PA 16,63516.6k $2.7k $2.7k 0.00% First filing
28 Mariner, LLC 0.00% of their portfolio Overland Park, KS 16,00016.0k $2.6k $2.6k 0.00% New
29 Torrey Growth & Income Advisors 0.00% of their portfolio DEL MAR, CA 15,68715.7k $2.4k $2.4k 0.00% Unchanged
30 Twin Lakes Capital Management, LLC 0.00% of their portfolio REDWOOD SHORES, CA 7,2007.2k $1.2k $1.2k 0.00% Reduced -1.8k -1,800
31 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 2,0002.0k $306 $306 0.00% Unchanged
32 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 500500 $80 $80 0.00% Unchanged
33 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 472472 $76 $76 0.00% Unchanged
34 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 129129 $20 $20 0.00% Unchanged