DOSSIER · 13F Holders · Q1 2026

ZSCALER INC

8 institutions still hold ZSCALER INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 98980G952·8 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$401M
visible holders
Holders
8
filers reporting
Concentration
47.97%
SG Americas Securities, LLC #1
top holder share
AI Holders Summary · Q1 2026

8 institutions reported ZSCALER INC in Q1 2026. SG Americas Securities, LLC leads at 48.0% of the visible book.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
SG Americas Securities, LLC
CIK 0001313360
$192M738K0.21%Q1 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$94M669K0.02%Q2 2026
03
Optiver Holding B.V.
CIK 0001859606· Market maker
$76M541K0.02%Q2 2026
04
SIMPLEX TRADING, LLC
CIK 0001488542
$22M155K0.01%Q2 2026
05
GROUP ONE TRADING LLC
CIK 0000932540
$9M66K0.01%Q2 2026
06
Maven Securities LTD
CIK 0001633046
$5M34K0.09%Q2 2026
07
JPMORGAN CHASE & CO
CIK 0000019617
$2M14K0.00%Q2 2026
08
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025