DOSSIER · 13F Holders · Q3 2026

MUELLER WTR PRODS INC

3 institutions still hold MUELLER WTR PRODS INC as of Q3 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 624758958·3 13F holders·last filed Sep 30, 2026
Market cap
—
13F value held
$72K
visible holders
Holders
3
filers reporting
Concentration
64.71%
SIMPLEX TRADING, LLC #1
top holder share
AI Holders Summary · Q3 2026

3 institutions reported MUELLER WTR PRODS INC in Q3 2026. SIMPLEX TRADING, LLC leads at 64.7% 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
$47K2K0.00%Q3 2026
02
GROUP ONE TRADING LLC
CIK 0000932540
$25K1K0.00%Q3 2026
03
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00—Q2 2025