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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2001
Goodyear
GT
$2.07B
| $790K | ﹤0.01% |
33,933
-7,295
| -18% | -$187K |
|
2002
Lumentum
LITE
$59.4B
| $789K | ﹤0.01% |
+13,640
| New | +$813K |
|
2003
CALL
PTC
PTC
$13.7B
| $788K | ﹤0.01% |
84
+66
| +367% | +$5.71K |
|
|
APTI
2004
DELISTED
Apptio, Inc. Class A Common Stock
APTI
| $788K | ﹤0.01% |
+21,777
| New | +$699K |
|
2005
CALL
Team
TISI
$77.7M
| $783K | ﹤0.01% |
+34
| New | +$6.54K |
|
|
CERN
2006
PUT
DELISTED
Cerner Corp
CERN
| $783K | ﹤0.01% |
131
-365
| -74% | -$21.6K |
|
2007
Direxion Daily MSCI Brazil Bull 2X ETF
BRZU
$100M
| $781K | ﹤0.01% |
1,255
+1,227
| +4,382% | +$1.41M |
|
2008
CALL
Thor Industries
THO
$3.99B
| $779K | ﹤0.01% |
80
-585
| -88% | -$59.7K |
|
|
SRNE
2009
CALL
DELISTED
Sorrento Therapeutics, Inc.
SRNE
| $779K | ﹤0.01% |
1,082
+535
| +98% | +$3.64K |
|
|
ENV
2010
DELISTED
ENVESTNET, INC.
ENV
| $778K | ﹤0.01% |
+14,171
| New | +$787K |
|
2011
Axalta
AXTA
$7.01B
| $777K | ﹤0.01% |
25,655
-787
| -3% | -$24.7K |
|
2012
CALL
Cheesecake Factory
CAKE
$4.21B
| $776K | ﹤0.01% |
141
+108
| +327% | +$5.72K |
|
2013
PUT
GoDaddy
GDDY
$12.3B
| $776K | ﹤0.01% |
110
-89
| -45% | -$6.05K |
|
2014
CALL
Vanguard FTSE Developed Markets ETF
VEA
$226B
| $776K | ﹤0.01% |
181
+4
| +2% | +$178 |
|
2015
TechTarget
TTGT
$246M
| $775K | ﹤0.01% |
27,320
+25,077
| +1,118% | +$601K |
|
|
CONN
2016
CALL
DELISTED
Conn's Inc.
CONN
| $775K | ﹤0.01% |
235
-76
| -24% | -$2.18K |
|
|
ZNH
2017
CALL
DELISTED
China Southern Airlines Company Limited
ZNH
| $774K | ﹤0.01% |
196
-48
| -20% | -$2.47K |
|
2018
CALL
Murphy Oil
MUR
$5.58B
| $773K | ﹤0.01% |
229
+163
| +247% | +$5.03K |
|
2019
PUT
Owens Corning
OC
$11.5B
| $773K | ﹤0.01% |
122
+120
| +6,000% | +$8.29K |
|
|
KEM
2020
CALL
DELISTED
KEMET Corporation
KEM
| $772K | ﹤0.01% |
320
-462
| -59% | -$9.4K |
|
2021
PUT
Steel Dynamics
STLD
$35.6B
| $771K | ﹤0.01% |
168
-14
| -8% | -$662 |
|
|
ORBK
2022
DELISTED
Orbotech Ltd
ORBK
| $771K | ﹤0.01% |
12,484
-21,822
| -64% | -$1.35M |
|
2023
PUT
Howard Hughes
HHH
$3.93B
| $768K | ﹤0.01% |
+61
| New | +$7.77K |
|
2024
PUT
Alarm.com
ALRM
$2.56B
| $767K | ﹤0.01% |
190
-126
| -40% | -$5.23K |
|
2025
CALL
KKR & Co
KKR
$89.2B
| $767K | ﹤0.01% |
309
-303
| -50% | -$6.73K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.