SIMPLEX TRADING, LLC

Q4 2018 13F Holdings Report, Stock Holdings

Holdings as of: 31 Dec 2018
13F market value: $1,144,153,000
13F holdings: 1,811
Largest 13F holdings: GOOG IWM AMZN SPY NFLX QQQ AAPL XLF SQ V XOP WYNN
+8 more
SMH NVDA EA SLB ROKU FXE RDSA DAL
What this filing covers: Period
Q4 2018
Calendar quarter covered by the filing.
13F holdings
1,811
Parsed equity rows, excluding option-only view rows.
Reported value
$1,144,153,000
SEC Form 13F market value, not total AUM.
Accepted by SEC
16 Jan 2019
EDGAR acceptance date.
How to read this filing
Start with the largest positions and changes, then open issuer-level rows for CUSIP-specific history.
Form 13F market value excludes cash and many non-13F assets, so it should not be treated as total assets under management.
SEC classifies this as a holdings report: this manager reports its visible U.S.-listed equity holdings in this filing.
Signature and title: Erik Swanson - Chief Executive Officer
Location: Chicago, IL
Accepted by SEC: 16 Jan 2019, 14:43:23 UTC
Form type: 13F-HR
Previous filing: Q3 2018 - 23 Oct 2018
Next filing: Q1 2019 - 18 Apr 2019
SEC filing: View on sec.gov
Options holdings: Showing equity holdings. Open options holdings.

Key filing fact

SIMPLEX TRADING, LLC reported $1,144,153,000 across 1,811 holdings in Q4 2018.

Key facts

SIMPLEX TRADING, LLC reported 13f holdings report, stock holdings for Q4 2018.
13F holdings value: $1,144,153,000.
1,811 holdings are listed in this filing snapshot.

Change

Previous comparable filing: Q3 2018.
Value moved from $1,706,473,000 to $1,144,153,000.

Research use

This filing-level page explains what the portfolio report tells you before the holdings table.
You can cite quarter, value, and filing timestamp directly from SEC-linked data.

Evidence

Backed by Form 13F

Portfolio-level numbers on this page come from the original SEC Form 13F filing.

See Original Filing

13F holdings

Security, weight, value, share count, and activity in one filing-backed table.

Holdings

1,811

Value

$1,144,153,000

Period

Q4 2018

Sym	Weight	Trade Impact	Company	Class	Share Change	Activity	Value change	SEC-reported value	SEC-reported price	Shares	Principal

This view compares filing 2018 Q4 with 2018 Q3. Changes are calculated against the previous SEC filing.

Compare Q4 2018 to

SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held.
^* marks a reported price that did not pass the local price check.

Person Signing this Report on Behalf of Reporting Manager:

Name	Title	City, State	Date
Erik Swanson	Chief Executive Officer	Chicago, Illinois	16 Jan 2019