DOSSIER · 13F Holders · Q2 2026

PLUG POWER INC

7 institutions still hold PLUG POWER INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 72919P902·7 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$17M
visible holders
Holders
7
filers reporting
Concentration
49.03%
SIMPLEX TRADING, LLC #1
top holder share
AI Holders Summary · Q2 2026

7 institutions reported PLUG POWER INC in Q2 2026. SIMPLEX TRADING, LLC leads at 49.0% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
SIMPLEX TRADING, LLC
CIK 0001488542
$8M3.0M0.00%Q2 2026
02
IMC-Chicago, LLC
CIK 0001452861· Market maker
$5M1.7M0.00%Q2 2026
03
GROUP ONE TRADING LLC
CIK 0000932540
$4M1.4M0.01%Q2 2026
04
Sender Co & Partners, Inc.
CIK 0001659380
$244K90K0.07%Q2 2026
05
Caitlin John, LLC
CIK 0002010947
$49K18K0.03%Q2 2026
06
Marathon Trading Investment Management LLC
CIK 0001572748
$5422000.00%Q2 2026
07
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025