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 | |
|---|---|---|---|---|---|---|
2801
PUT
Spok Holdings
SPOK
$221M
| $361K | ﹤0.01% |
240
-76
| -24% | -$1.14K |
|
|
FIT
2802
CALL
DELISTED
Fitbit, Inc. Class A common stock
FIT
| $361K | ﹤0.01% |
553
+283
| +105% | +$1.62K |
|
|
IPHS
2803
CALL
DELISTED
Innophos Holdings, Inc.
IPHS
| $361K | ﹤0.01% |
76
+17
| +29% | +$773 |
|
|
CY
2804
PUT
DELISTED
Cypress Semiconductor
CY
| $361K | ﹤0.01% |
232
+141
| +155% | +$2.33K |
|
2805
PUT
BJ's Restaurants
BJRI
$1.41B
| $360K | ﹤0.01% |
+60
| New | +$3.22K |
|
2806
CALL
Commercial Metals
CMC
$7.63B
| $360K | ﹤0.01% |
171
-137
| -44% | -$3.05K |
|
2807
PUT
Floor & Decor
FND
$5.81B
| $360K | ﹤0.01% |
73
+33
| +83% | +$1.7K |
|
2808
PUT
LCI Industries
LCII
$2.51B
| $360K | ﹤0.01% |
40
-75
| -65% | -$6.97K |
|
2809
Casey's General Stores
CASY
$31.9B
| $359K | ﹤0.01% |
+3,417
| New | +$346K |
|
2810
SiriusXM
SIRI
$10B
| $359K | ﹤0.01% |
5,306
+4,805
| +959% | +$325K |
|
2811
CALL
MBIA
MBI
$288M
| $358K | ﹤0.01% |
397
+85
| +27% | +$767 |
|
2812
CALL
Semtech
SMTC
$11.7B
| $357K | ﹤0.01% |
76
-42
| -36% | -$1.88K |
|
|
ERF
2813
PUT
DELISTED
Enerplus Corporation
ERF
| $357K | ﹤0.01% |
284
+189
| +199% | +$2.27K |
|
|
CRON
2814
CALL
Cronos Group
CRON
$1.05B
| $356K | ﹤0.01% |
547
+352
| +181% | +$2.31K |
|
2815
PUT
Trinity Industries
TRN
$2.97B
| $356K | ﹤0.01% |
144
+18
| +14% | +$433 |
|
2816
State Street Materials Select Sector SPDR ETF
XLB
$8.51B
| $356K | ﹤0.01% |
12,280
-33,570
| -73% | -$984K |
|
|
MZOR
2817
DELISTED
Mazor Robotics Ltd.
MZOR
| $356K | ﹤0.01% |
6,420
-7,893
| -55% | -$456K |
|
2818
AutoNation
AN
$6.97B
| $355K | ﹤0.01% |
+7,317
| New | +$347K |
|
|
HUYA
2819
PUT
Huya Inc
HUYA
$542M
| $355K | ﹤0.01% |
+108
| New | +$3.24K |
|
2820
CALL
Omeros
OMER
$709M
| $355K | ﹤0.01% |
196
-470
| -71% | -$8.14K |
|
|
XENT
2821
CALL
DELISTED
Intersect ENT, Inc
XENT
| $355K | ﹤0.01% |
95
+84
| +764% | +$3.3K |
|
|
SORL
2822
CALL
DELISTED
SORL Auto Parts, Inc.
SORL
| $355K | ﹤0.01% |
762
+684
| +877% | +$3.21K |
|
2823
FirstEnergy
FE
$28.9B
| $354K | ﹤0.01% |
9,863
-45,545
| -82% | -$1.56M |
|
2824
CALL
Jabil
JBL
$32.8B
| $354K | ﹤0.01% |
128
-42
| -25% | -$1.18K |
|
2825
CALL
Pediatrix Medical
MD
$2.16B
| $354K | ﹤0.01% |
82
-8
| -9% | -$383 |
|
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.