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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
Autodesk
ADSK
$44.3B
| $3.02M | ﹤0.01% |
+12,415
| New | +$2.68M |
|
2002
PUT
Penske Automotive Group
PAG
$14.3B
| $3.02M | ﹤0.01% |
18,800
+7,400
| +65% | +$1.13M |
|
2003
CALL
Inspire Medical Systems
INSP
$1.42B
| $3.01M | ﹤0.01% |
14,800
-200
| -1% | -$32.4K |
|
2004
CALL
Sensient Technologies
SXT
$5.4B
| $3M | ﹤0.01% |
+45,500
| New | +$2.7M |
|
2005
Camping World
CWH
$363M
| $3M | ﹤0.01% |
114,273
+81,364
| +247% | +$1.7M |
|
2006
Freeport-McMoran
FCX
$90B
| $3M | ﹤0.01% |
+70,404
| New | +$2.6M |
|
2007
QuantumScape Corp
QS
$3B
| $3M | ﹤0.01% |
431,056
-363,180
| -46% | -$2.29M |
|
2008
CALL
Martin Marietta Materials
MLM
$33.6B
| $2.99M | ﹤0.01% |
6,000
-20,200
| -77% | -$9.11M |
|
2009
PUT
Murphy Oil
MUR
$5.58B
| $2.99M | ﹤0.01% |
70,100
+57,300
| +448% | +$2.51M |
|
2010
CALL
Infosys
INFY
$45B
| $2.99M | ﹤0.01% |
162,500
+23,200
| +17% | +$404K |
|
2011
CALL
PagSeguro Digital
PAGS
$2.57B
| $2.99M | ﹤0.01% |
239,500
+400
| +0.2% | +$3.68K |
|
2012
CALL
Gran Tierra Energy
GTE
$260M
| $2.98M | ﹤0.01% |
529,100
-800
| -0.2% | -$4.97K |
|
2013
PUT
Consolidated Edison
ED
$41.6B
| $2.98M | ﹤0.01% |
32,800
+5,900
| +22% | +$527K |
|
|
EH
2014
PUT
EHang Holdings
EH
$372M
| $2.98M | ﹤0.01% |
177,500
+113,400
| +177% | +$1.85M |
|
2015
CALL
CVR Partners
UAN
$1.3B
| $2.98M | ﹤0.01% |
45,500
+22,700
| +100% | +$1.7M |
|
2016
PUT
Fastenal
FAST
$54B
| $2.98M | ﹤0.01% |
92,000
+55,600
| +153% | +$1.68M |
|
2017
CALL
Organon & Co
OGN
$3.55B
| $2.97M | ﹤0.01% |
205,800
+15,600
| +8% | +$212K |
|
2018
United States Natural Gas Fund
UNG
$470M
| $2.97M | ﹤0.01% |
146,312
+82,447
| +129% | +$2.05M |
|
2019
PUT
iQIYI
IQ
$1.18B
| $2.96M | ﹤0.01% |
607,500
-540,700
| -47% | -$2.56M |
|
2020
CALL
Axsome Therapeutics
AXSM
$12.4B
| $2.96M | ﹤0.01% |
37,200
+4,400
| +13% | +$294K |
|
2021
CALL
Jacobs Solutions
J
$15.9B
| $2.96M | ﹤0.01% |
27,565
-967
| -3% | -$105K |
|
2022
PUT
Vertiv
VRT
$112B
| $2.96M | ﹤0.01% |
61,600
+14,500
| +31% | +$617K |
|
2023
ProShares UltraPro S&P 500
UPRO
$5.1B
| $2.96M | ﹤0.01% |
53,990
-993
| -2% | -$45.5K |
|
2024
PVH
PVH
$3.71B
| $2.95M | ﹤0.01% |
24,140
+6,188
| +34% | +$554K |
|
|
SRG
2025
CALL
Seritage Growth Properties
SRG
$130M
| $2.95M | ﹤0.01% |
315,100
-49,200
| -14% | -$414K |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.