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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
101
Energy Transfer Partners
ET
$69.7B
| $1.7M | 0.2% |
53,734
+50,988
| +1,857% | +$1.51M |
|
|
LNKD
102
CALL
DELISTED
LinkedIn Corporation
LNKD
| $1.69M | 0.2% |
647
-246
| -28% | -$61.1K |
|
103
PUT
NOV
NOV
$7.02B
| $1.67M | 0.19% |
1,353
+396
| +41% | +$21.5K |
|
104
Vipshop
VIPS
$7.01B
| $1.63M | 0.19% |
55,527
-6,535
| -11% | -$158K |
|
|
105
CALL
Baidu
BIDU
$36.8B
| $1.63M | 0.19% |
+2,499
| New | +$535K |
|
106
lululemon athletica
LULU
$13.2B
| $1.62M | 0.19% |
+25,332
| New | +$1.62M |
|
|
107
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $1.61M | 0.19% |
+1,660
| New | +$244K |
|
|
SNDK
108
DELISTED
SANDISK CORP
SNDK
| $1.6M | 0.19% |
+25,168
| New | +$2.05M |
|
109
Regeneron Pharmaceuticals
REGN
$70.5B
| $1.59M | 0.18% |
3,514
+2,404
| +217% | +$1.02M |
|
110
PUT
State Street SPDR NYSE Technology ETF
XNTK
$2.16B
| $1.57M | 0.18% |
8,600
-12,120
| -58% | -$613K |
|
|
111
NOV
NOV
$7.02B
| $1.56M | 0.18% |
31,251
+17,164
| +122% | +$931K |
|
|
VXX
112
CALL
DELISTED
iPath S&P 500 VIX Short-Term Futures ETN due 1/30/2019
VXX
| $1.54M | 0.18% |
368
-61
| -14% | -$29.6K |
|
113
JD.com
JD
$41.1B
| $1.54M | 0.18% |
52,461
+25,490
| +95% | +$684K |
|
|
114
PUT
Booking.com
BKNG
$139B
| $1.48M | 0.17% |
31,200
-6,500
| -17% | -$291K |
|
115
ProShares Ultra QQQ
QLD
$13.5B
| $1.48M | 0.17% |
+332,064
| New | +$1.46M |
|
|
RCPT
116
DELISTED
RECEPTOS INC COM STK (DE)
RCPT
| $1.48M | 0.17% |
+8,974
| New | +$1.14M |
|
117
Wynn Resorts
WYNN
$9.93B
| $1.47M | 0.17% |
11,650
+6,002
| +106% | +$856K |
|
118
Trip.com Group
TCOM
$27.5B
| $1.45M | 0.17% |
49,408
-35,028
| -41% | -$846K |
|
119
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.6B
| $1.43M | 0.17% |
133,800
+127,500
| +2,024% | +$360K |
|
120
Home Depot
HD
$332B
| $1.42M | 0.16% |
12,481
+10,260
| +462% | +$1.13M |
|
121
Prudential Financial
PRU
$41B
| $1.41M | 0.16% |
17,583
+14,625
| +494% | +$1.18M |
|
|
GMCR
122
PUT
DELISTED
KEURIG GREEN MTN INC
GMCR
| $1.41M | 0.16% |
945
+12
| +1% | +$1.5K |
|
123
American Express
AXP
$240B
| $1.39M | 0.16% |
+17,799
| New | +$1.48M |
|
124
VanEck Gold Miners ETF
GDX
$22.7B
| $1.38M | 0.16% |
75,866
+12,613
| +20% | +$257K |
|
125
Vertex Pharmaceuticals
VRTX
$122B
| $1.38M | 0.16% |
+11,681
| New | +$1.4M |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.