Vault-13

BIOATLA INC BCAB

COM · Common Stock · CUSIP 09077B104

1 institutional holders -33 vs Q1 2026
108,126108.1k shares reported held*
$447.6kreported value*
0 new 0 added 1 reduced 33 sold out net sold ≈ $63.2m (-15.3m 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 ≈ $4.14.

Trends to Q2 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: 34Q2 26: 11Q3 22Q3 23Q3 24Q3 25Q2 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
Q2 20261

Buyers vs sellers

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

Bought or addedCut or sold out
1000100Q3 24: 22 bought or addedQ3 24: 54 cut or sold outQ4 24: 33 bought or addedQ4 24: 39 cut or sold outQ4 24Q1 25: 16 bought or addedQ1 25: 41 cut or sold outQ2 25: 13 bought or addedQ2 25: 20 cut or sold outQ2 25Q3 25: 21 bought or addedQ3 25: 11 cut or sold outQ4 25: 21 bought or addedQ4 25: 13 cut or sold outQ4 25Q1 26: 13 bought or addedQ1 26: 21 cut or sold outQ2 26: 0 bought or addedQ2 26: 34 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 20242254
Q4 20243339
Q1 20251641
Q2 20251320
Q3 20252111
Q4 20252113
Q1 20261321
Q2 2026034

Calls vs puts

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

CallsPuts
$0$20k$40k$60kQ3 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 0.00Q2 26 calls: $0Q2 26 puts: $0Q2 26P/C —
Numbers
QuarterCallsPutsP/C
Q3 2025$48.8k$00.00
Q4 2025$6.8k$3400.05
Q1 2026$17.5k$320.00
Q2 2026$0$0—

Biggest buyers

None

Biggest sellers

ACORN CAPITAL ADVISORS, LLC Reduced -5,298,219-5.3m
MILLENNIUM MANAGEMENT LLC Sold out -2,756,674-2.8m
VANGUARD CAPITAL MANAGEMENT LLC Sold out -1,649,252-1.6m
ACADIAN ASSET MANAGEMENT LLC Sold out -1,233,919-1.2m
GEODE CAPITAL MANAGEMENT, LLC Sold out -689,182-689.2k
DEUTSCHE BANK AG\ Sold out -525,352-525.4k
RENAISSANCE TECHNOLOGIES LLC Sold out -510,514-510.5k
BlackRock, Inc. Sold out -480,931-480.9k
CITADEL ADVISORS LLC Sold out -435,675-435.7k
UBS Group AG Sold out -375,569-375.6k

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 since 1 Apr 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 since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 ACORN CAPITAL ADVISORS, LLC 0.12% of their portfolio NEW YORK, NY 108,126108.1k $447.6k $447.6k 0.12% Reduced -5.3m -5,298,219