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 | |
|---|---|---|---|---|---|---|
701
CALL
Kimberly-Clark
KMB
$36.1B
| $3.8M | 0.01% |
361
+29
| +9% | +$3.01K |
|
702
PUT
Children's Place
PLCE
$60.4M
| $3.79M | 0.01% |
314
+105
| +50% | +$13.6K |
|
703
CALL
F5
FFIV
$22.6B
| $3.78M | 0.01% |
219
+37
| +20% | +$6.17K |
|
|
TSRO
704
PUT
DELISTED
TESARO, Inc.
TSRO
| $3.76M | 0.01% |
846
+670
| +381% | +$32.5K |
|
705
PUT
Bunge Global
BG
$24B
| $3.76M | 0.01% |
539
-433
| -45% | -$31K |
|
706
ServiceNow
NOW
$98.4B
| $3.76M | 0.01% |
108,930
+64,700
| +146% | +$2.24M |
|
707
PUT
Marriott Vacations Worldwide
VAC
$3.33B
| $3.75M | 0.01% |
332
+230
| +225% | +$28.4K |
|
708
Trip.com Group
TCOM
$26.8B
| $3.75M | 0.01% |
78,729
+17,187
| +28% | +$777K |
|
709
CALL
Vail Resorts
MTN
$5.16B
| $3.73M | 0.01% |
136
-30
| -18% | -$7.35K |
|
710
CALL
Cheniere Energy
LNG
$56B
| $3.72M | 0.01% |
571
-169
| -23% | -$10.4K |
|
711
CALL
McKesson
MCK
$95.3B
| $3.72M | 0.01% |
279
-394
| -59% | -$57.6K |
|
712
United Airlines
UAL
$38.1B
| $3.72M | 0.01% |
53,326
+31,798
| +148% | +$2.21M |
|
713
CALL
Baxter International
BAX
$11.2B
| $3.71M | 0.01% |
503
+259
| +106% | +$18.3K |
|
714
CALL
Intercontinental Exchange
ICE
$80.6B
| $3.71M | 0.01% |
505
+302
| +149% | +$22K |
|
715
PUT
Church & Dwight Co
CHD
$23B
| $3.69M | 0.01% |
695
-324
| -32% | -$15.7K |
|
716
PUT
Rio Tinto
RIO
$150B
| $3.69M | 0.01% |
666
-406
| -38% | -$22.7K |
|
717
CALL
O'Reilly Automotive
ORLY
$71.7B
| $3.69M | 0.01% |
2,025
+345
| +21% | +$6.01K |
|
718
CALL
Trane Technologies
TT
$105B
| $3.69M | 0.01% |
411
+241
| +142% | +$21.2K |
|
719
CALL
EPR Properties
EPR
$4.75B
| $3.69M | 0.01% |
569
+510
| +864% | +$30.2K |
|
720
PUT
Helmerich & Payne
HP
$3.52B
| $3.69M | 0.01% |
578
+283
| +96% | +$19.3K |
|
721
PUT
Synchrony
SYF
$23.7B
| $3.68M | 0.01% |
1,103
+519
| +89% | +$17.8K |
|
|
ABMD
722
PUT
DELISTED
Abiomed Inc
ABMD
| $3.68M | 0.01% |
90
+48
| +114% | +$17.4K |
|
|
DOCU
723
PUT
DocuSign
DOCU
$9.14B
| $3.66M | 0.01% |
+692
| New | +$34.9K |
|
724
CALL
WIX.com
WIX
$2.04B
| $3.66M | 0.01% |
365
+201
| +123% | +$17.9K |
|
725
Ulta Beauty
ULTA
$20.8B
| $3.65M | 0.01% |
+15,617
| New | +$3.77M |
|
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.