Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$42.6M |
| 2 |
Shopify
SHOP
|
+$39.6M |
| 3 |
iShares China Large-Cap ETF
FXI
|
+$35.4M |
| 4 |
Verizon
VZ
|
+$34.1M |
| 5 |
KraneShares CSI China Internet ETF
KWEB
|
+$34.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
AMC Entertainment Holdings
AMC
|
+$49.5M |
| 2 |
GE Aerospace
GE
|
+$35.2M |
| 3 |
Carnival Corporation Ltd
CCL
|
+$30.5M |
| 4 |
Advanced Micro Devices
AMD
|
+$28.8M |
| 5 |
Micron Technology
MU
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.61% |
| 2 | Consumer Discretionary | 0.43% |
| 3 | Healthcare | 0.35% |
| 4 | Communication Services | 0.23% |
| 5 | Financials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
Box
BOX
$4.02B
| $2.08M | ﹤0.01% |
79,645
+23,462
| +42% | +$604K |
|
2002
CALL
Chemours
CC
$2.59B
| $2.08M | ﹤0.01% |
62,100
-28,200
| -31% | -$878K |
|
2003
CALL
LyondellBasell Industries
LYB
$19.5B
| $2.08M | ﹤0.01% |
22,600
+9,700
| +75% | +$900K |
|
|
VZIO
2004
CALL
DELISTED
VIZIO Holding Corp.
VZIO
| $2.08M | ﹤0.01% |
107,200
+49,900
| +87% | +$984K |
|
2005
CALL
CSX Corp
CSX
$98.6B
| $2.08M | ﹤0.01% |
55,300
-212,900
| -79% | -$7.51M |
|
2006
CALL
LegalZoom.com
LZ
$1.23B
| $2.08M | ﹤0.01% |
+129,400
| New | +$2.75M |
|
2007
CALL
Rithm Capital
RITM
$5.09B
| $2.08M | ﹤0.01% |
194,200
-190,400
| -50% | -$2.12M |
|
2008
CALL
Raymond James Financial
RJF
$32.5B
| $2.08M | ﹤0.01% |
20,700
+3,800
| +22% | +$376K |
|
2009
PUT
StoneCo
STNE
$2.62B
| $2.08M | ﹤0.01% |
123,200
+59,300
| +93% | +$1.5M |
|
2010
PUT
Quest Diagnostics
DGX
$25.1B
| $2.08M | ﹤0.01% |
12,000
-14,400
| -55% | -$2.19M |
|
|
RDFN
2011
PUT
DELISTED
Redfin
RDFN
| $2.08M | ﹤0.01% |
54,100
-74,000
| -58% | -$3.36M |
|
2012
PUT
Crane NXT
CXT
$3.04B
| $2.08M | ﹤0.01% |
58,732
+51,247
| +685% | +$1.78M |
|
2013
United States Natural Gas Fund
UNG
$470M
| $2.08M | ﹤0.01% |
41,535
+11,409
| +38% | +$742K |
|
|
AYX
2014
CALL
DELISTED
Alteryx Inc
AYX
| $2.08M | ﹤0.01% |
34,300
-33,300
| -49% | -$2.3M |
|
2015
Cedar Fair
FUN
$1.78B
| $2.07M | ﹤0.01% |
41,431
-11,898
| -22% | -$569K |
|
2016
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $2.07M | ﹤0.01% |
18,600
-7,900
| -30% | -$613K |
|
|
EMBJ
2017
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $2.07M | ﹤0.01% |
116,700
+22,200
| +23% | +$359K |
|
2018
CALL
Omega Healthcare
OHI
$15.4B
| $2.07M | ﹤0.01% |
70,000
+33,900
| +94% | +$990K |
|
2019
CALL
Service Corp International
SCI
$11.4B
| $2.06M | ﹤0.01% |
29,100
-45,800
| -61% | -$3.04M |
|
2020
PUT
State Street SPDR Portfolio Europe ETF
SPEU
$712M
| $2.06M | ﹤0.01% |
44,000
+9,800
| +29% | +$414K |
|
2021
O'Reilly Automotive
ORLY
$72.4B
| $2.06M | ﹤0.01% |
43,830
-38,580
| -47% | -$1.67M |
|
|
SGI
2022
Somnigroup International
SGI
$15.1B
| $2.06M | ﹤0.01% |
43,787
-19,357
| -31% | -$877K |
|
2023
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.24B
| $2.06M | ﹤0.01% |
+18,951
| New | +$2.05M |
|
2024
State Street SPDR Portfolio S&P 1500 Composite Stock Market ETF
SPTM
$13.5B
| $2.06M | ﹤0.01% |
+35,160
| New | +$1.99M |
|
|
GOEV
2025
CALL
DELISTED
Canoo Inc. Class A Common Stock
GOEV
| $2.05M | ﹤0.01% |
578
+55
| +11% | +$220K |
|
Similar funds
Simplex Trading's Q4 2021 Portfolio in Review
As of Q4 2021, Simplex Trading held 12,077 positions worth $99B, down 7.5% from $107B the previous quarter. Its ten largest holdings account for 33% of the portfolio.
Simplex Trading withdrew a net $10.8B in Q4 2021, closing 1,645 positions and reducing 4,258 holdings. Its most notable exit was Carnival Corporation Ltd, an estimated $30.5M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.61% of assets, up from 0.49% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares China Large-Cap ETF worth $33M.
- Simplex Trading's largest Q4 2021 buy was iShares China Large-Cap ETF: 902,666 shares worth $33M.
- Simplex Trading added most to State Street Financial Select Sector SPDR ETF in Q4 2021, an estimated $42.6M increase.
- Simplex Trading's biggest Q4 2021 reduction was AMC Entertainment Holdings, cutting an estimated $49.5M.
- Simplex Trading fully exited Carnival Corporation Ltd in Q4 2021, selling an estimated $30.5M.
- Simplex Trading's ten largest holdings make up 33% of its $99B portfolio in Q4 2021.
- Simplex Trading opened 2,269 new positions and closed 1,645 in Q4 2021.
- Simplex Trading's portfolio value fell 7.5% quarter-over-quarter to $99B.
Based on Simplex Trading's 13F filing for Q4 2021, filed 4 Feb 2022.