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 | |
|---|---|---|---|---|---|---|
|
ALXN
76
DELISTED
Alexion Pharmaceuticals
ALXN
| $5.57M | 0.24% |
49,991
+49,838
| +32,574% | +$5.96M |
|
77
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $5.48M | 0.24% |
+16,042
| New | +$5.58M |
|
78
PUT
Baidu
BIDU
$36.8B
| $5.42M | 0.24% |
3,356
-756
| -18% | -$186K |
|
79
Chevron
CVX
$381B
| $5.4M | 0.24% |
47,384
-11,715
| -20% | -$1.4M |
|
80
WisdomTree Japan Hedged Equity Fund
DXJ
$7.21B
| $5.29M | 0.23% |
94,364
+22,948
| +32% | +$1.34M |
|
81
iShares MSCI Japan ETF
EWJ
$22.1B
| $5.01M | 0.22% |
82,555
-10,618
| -11% | -$652K |
|
82
Target
TGT
$63.4B
| $4.98M | 0.22% |
+71,700
| New | +$5.22M |
|
83
CVS Health
CVS
$141B
| $4.97M | 0.22% |
79,902
+20,058
| +34% | +$1.44M |
|
|
84
CALL
Tesla
TSLA
$1.42T
| $4.83M | 0.21% |
79,140
-18,540
| -19% | -$408K |
|
|
AABA
85
DELISTED
Altaba Inc
AABA
| $4.82M | 0.21% |
65,055
-137,294
| -68% | -$10.3M |
|
86
ExxonMobil
XOM
$629B
| $4.76M | 0.21% |
63,767
+395
| +0.6% | +$31.6K |
|
87
iShares MSCI Brazil ETF
EWZ
$9.02B
| $4.73M | 0.21% |
105,333
-150,906
| -59% | -$6.75M |
|
88
Pfizer
PFE
$142B
| $4.58M | 0.2% |
+135,875
| New | +$4.67M |
|
89
CALL
PG&E
PCG
$38.5B
| $4.53M | 0.2% |
102,006
+101,160
| +11,957% | +$4.29M |
|
90
PUT
GE Aerospace
GE
$353B
| $4.49M | 0.2% |
2,274
+9
| +0.4% | +$667 |
|
91
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
$3.42B
| $4.47M | 0.2% |
+31,771
| New | +$4.55M |
|
|
VMW
92
CALL
DELISTED
VMware, Inc
VMW
| $4.42M | 0.19% |
34,663
+34,084
| +5,887% | +$4.29M |
|
93
Delta Air Lines
DAL
$55.7B
| $4.37M | 0.19% |
+79,700
| New | +$4.4M |
|
94
General Motors
GM
$71.7B
| $4.33M | 0.19% |
119,110
+43,072
| +57% | +$1.75M |
|
95
PUT
Universal Display
OLED
$3.81B
| $4.29M | 0.19% |
1,288
+870
| +208% | +$131K |
|
96
CALL
Home Depot
HD
$331B
| $4.21M | 0.19% |
3,111
-207
| -6% | -$38.8K |
|
97
Amgen
AMGN
$198B
| $4.2M | 0.18% |
24,637
+2,850
| +13% | +$523K |
|
98
CALL
iShares MSCI Australia ETF
EWA
$1.34B
| $4.13M | 0.18% |
45,056
+35,905
| +392% | +$828K |
|
|
AGN
99
PUT
DELISTED
Allergan plc
AGN
| $4.07M | 0.18% |
1,978
-1,709
| -46% | -$287K |
|
|
STZ.B
100
CALL
DELISTED
CONSTELLATION BRANDS, INC. CLASS B
STZ.B
| $4M | 0.18% |
15,575
+14,738
| +1,761% | +$3.24M |
|
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.