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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
BBRG
2926
DELISTED
Bravo Brio Restaurant Group Inc.
BBRG
| $31K | ﹤0.01% |
+7,900
| New | +$26.3K |
|
|
CRC
2927
PUT
DELISTED
California Resources Corporation
CRC
| $31K | ﹤0.01% |
160
+124
| +344% | +$2.33K |
|
2928
PUT
Advanced Energy
AEIS
$10.9B
| $30K | ﹤0.01% |
94
-198
| -68% | -$13.7K |
|
2929
PUT
Ameriprise Financial
AMP
$48.3B
| $30K | ﹤0.01% |
66
+19
| +40% | +$3.1K |
|
2930
CALL
Bank of Montreal
BMO
$127B
| $30K | ﹤0.01% |
91
+55
| +153% | +$4.33K |
|
2931
PUT
Chemours
CC
$2.57B
| $30K | ﹤0.01% |
635
-612
| -49% | -$30.6K |
|
2932
PUT
Century Aluminum
CENX
$4.35B
| $30K | ﹤0.01% |
+136
| New | +$2.84K |
|
2933
PUT
Carlyle Group
CG
$16.7B
| $30K | ﹤0.01% |
283
-69
| -20% | -$1.62K |
|
2934
CALL
Conduent
CNDT
$251M
| $30K | ﹤0.01% |
163
-285
| -64% | -$5.02K |
|
2935
PUT
Cenovus Energy
CVE
$51.6B
| $30K | ﹤0.01% |
504
+339
| +205% | +$2.99K |
|
2936
PUT
CoreCivic
CXW
$3.03B
| $30K | ﹤0.01% |
224
+74
| +49% | +$1.6K |
|
2937
CALL
Duke Energy
DUK
$101B
| $30K | ﹤0.01% |
916
+471
| +106% | +$36.4K |
|
2938
CALL
Energy Transfer Partners
ET
$69.5B
| $30K | ﹤0.01% |
1,286
-182
| -12% | -$3.02K |
|
2939
CALL
FIVE9
FIVN
$2.08B
| $30K | ﹤0.01% |
221
+97
| +78% | +$2.66K |
|
|
FLNT
2940
Fluent
FLNT
$103M
| $30K | ﹤0.01% |
2,000
+1,044
| +109% | +$22.6K |
|
2941
PUT
Geron
GERN
$930M
| $30K | ﹤0.01% |
151
+73
| +94% | +$197 |
|
|
B
2942
CALL
Barrick Mining
B
$61.5B
| $30K | ﹤0.01% |
403
+213
| +112% | +$2.83K |
|
2943
CALL
Guidewire Software
GWRE
$13.3B
| $30K | ﹤0.01% |
70
+7
| +11% | +$563 |
|
2944
PUT
Helmerich & Payne
HP
$3.31B
| $30K | ﹤0.01% |
295
-68
| -19% | -$4.59K |
|
2945
CALL
Ionis Pharmaceuticals
IONS
$9.14B
| $30K | ﹤0.01% |
138
-244
| -64% | -$12.4K |
|
2946
PUT
Itaú Unibanco
ITUB
$91.6B
| $30K | ﹤0.01% |
748
-1,406
| -65% | -$10.5K |
|
2947
CALL
Jack in the Box
JACK
$308M
| $30K | ﹤0.01% |
66
+10
| +18% | +$895 |
|
2948
Medifast
MED
$108M
| $30K | ﹤0.01% |
+327
| New | +$24.4K |
|
2949
Methode Electronics
MEI
$525M
| $30K | ﹤0.01% |
779
+591
| +314% | +$24K |
|
2950
Mueller Water Products
MWA
$4.05B
| $30K | ﹤0.01% |
+2,776
| New | +$32K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.