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 | |
|---|---|---|---|---|---|---|
76
CALL
Home Depot
HD
$332B
| $47M | 0.18% |
2,410
-701
| -23% | -$131K |
|
77
PUT
Deere & Co
DE
$158B
| $46.8M | 0.18% |
3,348
+1,999
| +148% | +$295K |
|
78
PUT
Walt Disney
DIS
$167B
| $46.3M | 0.18% |
4,421
+1,099
| +33% | +$112K |
|
79
PUT
Costco
COST
$412B
| $45.2M | 0.18% |
2,162
-434
| -17% | -$85.7K |
|
80
CALL
PayPal
PYPL
$49.3B
| $45.1M | 0.18% |
5,420
+1,008
| +23% | +$80.3K |
|
|
81
CALL
Walt Disney
DIS
$167B
| $45.1M | 0.18% |
4,303
+779
| +22% | +$79.7K |
|
|
82
Amazon
AMZN
$2.66T
| $45M | 0.18% |
529,440
-393,300
| -43% | -$31.2M |
|
|
83
Micron Technology
MU
$1.1T
| $45M | 0.18% |
857,462
+627,573
| +273% | +$33.9M |
|
|
84
Apple
AAPL
$4.81T
| $44.4M | 0.17% |
959,700
+760,724
| +382% | +$34.5M |
|
85
PUT
Chipotle Mexican Grill
CMG
$42.5B
| $44.3M | 0.17% |
51,350
+2,900
| +6% | +$23.7K |
|
86
CALL
McDonald's
MCD
$188B
| $44.2M | 0.17% |
2,821
+31
| +1% | +$5.03K |
|
|
AGN
87
CALL
DELISTED
Allergan plc
AGN
| $43.7M | 0.17% |
2,620
-532
| -17% | -$85.4K |
|
88
CALL
Adobe
ADBE
$90.3B
| $43.6M | 0.17% |
1,787
+577
| +48% | +$136K |
|
89
CALL
AbbVie
ABBV
$448B
| $43.3M | 0.17% |
4,675
-160
| -3% | -$15.6K |
|
|
90
Berkshire Hathaway Class B
BRK.B
$1.06T
| $43.2M | 0.17% |
231,691
+158,231
| +215% | +$30.8M |
|
|
91
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
$46B
| $42.2M | 0.17% |
173,733
+90,620
| +109% | +$22.2M |
|
|
92
CALL
Costco
COST
$412B
| $41.1M | 0.16% |
1,968
+250
| +15% | +$49.4K |
|
|
STZ.B
93
CALL
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $40.9M | 0.16% |
1,867
-13,708
| -88% | -$3.1M |
|
|
94
CALL
Chipotle Mexican Grill
CMG
$42.5B
| $40.7M | 0.16% |
47,150
-24,600
| -34% | -$201K |
|
95
CALL
JPMorgan Chase
JPM
$901B
| $40.4M | 0.16% |
3,962
-2,238
| -36% | -$246K |
|
|
AGN
96
PUT
DELISTED
Allergan plc
AGN
| $39.9M | 0.16% |
2,392
+414
| +21% | +$66.5K |
|
97
PUT
Lam Research
LRCX
$403B
| $38.5M | 0.15% |
22,290
+7,740
| +53% | +$149K |
|
|
TWTR
98
PUT
DELISTED
Twitter, Inc.
TWTR
| $38M | 0.15% |
8,698
+1,142
| +15% | +$40.1K |
|
99
CALL
Visa
V
$677B
| $38M | 0.15% |
2,866
-2,509
| -47% | -$323K |
|
100
CALL
Wynn Resorts
WYNN
$9.93B
| $37.9M | 0.15% |
2,265
-124
| -5% | -$22.9K |
|
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.