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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
76
Gilead Sciences
GILD
$164B
| $5.63M | 0.24% |
+78,525
| New | +$5.96M |
|
|
77
PUT
NVIDIA
NVDA
$5.01T
| $5.63M | 0.24% |
350,320
-110,840
| -24% | -$551K |
|
78
iShares MSCI Japan ETF
EWJ
$22B
| $5.58M | 0.24% |
+93,173
| New | +$5.47M |
|
|
79
PUT
Amazon
AMZN
$2.63T
| $5.49M | 0.24% |
115,720
-20,380
| -15% | -$1.12M |
|
80
Regeneron Pharmaceuticals
REGN
$70.4B
| $5.43M | 0.23% |
14,443
+10,270
| +246% | +$4.16M |
|
81
Halliburton
HAL
$28B
| $5.3M | 0.23% |
108,510
+91,962
| +556% | +$4.05M |
|
82
ExxonMobil
XOM
$638B
| $5.3M | 0.23% |
+63,372
| New | +$5.24M |
|
83
Procter & Gamble
PG
$349B
| $5.23M | 0.23% |
+56,971
| New | +$5.12M |
|
|
84
PUT
Alphabet (Google) Class A
GOOGL
$4.24T
| $5.21M | 0.22% |
99,760
-2,240
| -2% | -$116K |
|
85
CALL
Microsoft
MSFT
$2.9T
| $4.97M | 0.21% |
9,178
+1,146
| +14% | +$94K |
|
|
86
PUT
Apple
AAPL
$4.77T
| $4.95M | 0.21% |
50,956
-252
| -0.5% | -$10.5K |
|
87
Analog Devices
ADI
$187B
| $4.83M | 0.21% |
+54,262
| New | +$4.81M |
|
88
Skyworks Solutions
SWKS
$9.51B
| $4.69M | 0.2% |
+49,419
| New | +$5.15M |
|
89
DuPont de Nemours
DD
$19.1B
| $4.66M | 0.2% |
25,853
-62,363
| -71% | -$11.2M |
|
90
Cummins
CMI
$91.8B
| $4.64M | 0.2% |
26,272
+17,262
| +192% | +$2.95M |
|
91
CALL
State Street Materials Select Sector SPDR ETF
XLB
$8.44B
| $4.62M | 0.2% |
34,612
-428
| -1% | -$12.6K |
|
92
CALL
Micron Technology
MU
$1.09T
| $4.53M | 0.2% |
15,535
+7,295
| +89% | +$314K |
|
93
CALL
Caterpillar
CAT
$411B
| $4.51M | 0.19% |
2,402
+112
| +5% | +$15.5K |
|
94
Take-Two Interactive
TTWO
$43.6B
| $4.5M | 0.19% |
41,007
+25,508
| +165% | +$2.79M |
|
95
PUT
Invesco QQQ Trust
QQQ
$470B
| $4.5M | 0.19% |
25,611
-2,479
| -9% | -$378K |
|
96
PUT
Netflix
NFLX
$293B
| $4.4M | 0.19% |
107,880
+3,860
| +4% | +$74.3K |
|
97
Biogen
BIIB
$29.8B
| $4.4M | 0.19% |
13,807
+5,928
| +75% | +$1.9M |
|
98
CVS Health
CVS
$141B
| $4.34M | 0.19% |
59,844
+59,129
| +8,270% | +$4.3M |
|
99
American Airlines Group
AAL
$9.93B
| $4.24M | 0.18% |
+81,501
| New | +$4.06M |
|
100
WisdomTree Japan Hedged Equity Fund
DXJ
$7.19B
| $4.24M | 0.18% |
71,416
+23,481
| +49% | +$1.35M |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.