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 |
Amazon
AMZN
|
+$83.1M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$37.2M |
| 3 |
Amgen
AMGN
|
+$30.5M |
| 4 |
Micron Technology
MU
|
+$28.8M |
| 5 |
Qualcomm
QCOM
|
+$18.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$29.5M |
| 2 |
Goldman Sachs
GS
|
+$27.8M |
| 3 |
Gilead Sciences
GILD
|
+$27.6M |
| 4 |
Booking.com
BKNG
|
+$25.4M |
| 5 |
AT&T
T
|
+$19.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 39.87% |
| 2 | Technology | 13.76% |
| 3 | Communication Services | 11.79% |
| 4 | Consumer Discretionary | 10.02% |
| 5 | Healthcare | 7.62% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
|
1
Amazon
AMZN
$2.69T
| $119M | 5.17% |
2,461,120
+1,741,220
| +242% | +$83.1M |
2016 Q3
3 quarters
|
|
|
2
Alphabet (Google) Class A
GOOGL
$3.95T
| $56.1M | 2.44% |
1,207,840
+796,220
| +193% | +$37.2M |
2015 Q4
6 quarters
|
|
|
3
Micron Technology
MU
$975B
| $54.8M | 2.38% |
1,834,712
+985,505
| +116% | +$28.8M |
2016 Q4
2 quarters
|
|
4
NVIDIA
NVDA
$5.13T
| $49.3M | 2.14% |
13,652,200
+4,015,080
| +42% | +$12.8M |
2016 Q2
4 quarters
|
|
5
Apple
AAPL
$5.05T
| $48.7M | 2.12% |
1,353,804
+292,360
| +28% | +$10.8M |
2016 Q2
4 quarters
|
|
6
Alphabet (Google) Class C
GOOG
$3.91T
| $48.6M | 2.11% |
1,070,620
+94,260
| +10% | +$4.32M |
2016 Q3
3 quarters
|
|
|
7
State Street SPDR S&P 500 ETF Trust
SPY
$813B
| $42.8M | 1.86% |
176,879
-123,304
| -41% | -$29.5M |
2016 Q4
2 quarters
|
|
8
Meta Platforms (Facebook)
META
$1.64T
| $41.1M | 1.79% |
272,347
-127,608
| -32% | -$19M |
2014 Q4
10 quarters
|
|
9
Netflix
NFLX
$279B
| $33.6M | 1.46% |
2,247,950
+792,310
| +54% | +$12.2M |
2016 Q3
3 quarters
|
|
|
10
Amgen
AMGN
$243B
| $32.3M | 1.4% |
+187,633
| New | +$30.5M |
2017 Q2
0 quarters
|
|
11
CALL
Tesla
TSLA
$1.49T
| $25.3M | 1.1% |
126,600
+25,425
| +25% | +$560K |
2014 Q4
10 quarters
|
|
|
12
Qualcomm
QCOM
$184B
| $22.8M | 0.99% |
412,414
+326,465
| +380% | +$18.2M |
2017 Q1
1 quarter
|
|
|
13
CALL
State Street SPDR S&P 500 ETF Trust
SPY
$813B
| $20.2M | 0.88% |
25,686
-2,610
| -9% | -$625K |
2015 Q1
9 quarters
|
|
|
14
PUT
State Street SPDR S&P 500 ETF Trust
SPY
$813B
| $19M | 0.83% |
44,375
-1,622
| -4% | -$389K |
2015 Q1
9 quarters
|
|
15
Baidu
BIDU
$26.4B
| $18.8M | 0.82% |
105,026
+64,893
| +162% | +$11.8M |
2016 Q4
2 quarters
|
|
|
16
CALL
Meta Platforms (Facebook)
META
$1.64T
| $16.1M | 0.7% |
18,176
+2,375
| +15% | +$353K |
2014 Q4
10 quarters
|
|
17
CALL
Alibaba
BABA
$253B
| $16.1M | 0.7% |
12,867
+5,803
| +82% | +$717K |
2014 Q4
10 quarters
|
|
18
Western Digital
WDC
$132B
| $16M | 0.69% |
238,716
+120,132
| +101% | +$7.98M |
2016 Q2
4 quarters
|
|
19
Constellation Brands
STZ
$23.4B
| $15.9M | 0.69% |
82,269
+64,141
| +354% | +$11.4M |
2015 Q1
9 quarters
|
|
20
Microsoft
MSFT
$3.88T
| $15.2M | 0.66% |
+221,193
| New | +$15.2M |
2017 Q2
0 quarters
|
|
|
21
PUT
Alphabet (Google) Class A
GOOGL
$3.95T
| $15.1M | 0.66% |
98,380
+15,220
| +18% | +$712K |
2015 Q4
6 quarters
|
|
22
NetEase
NTES
$75.7B
| $15.1M | 0.66% |
251,220
+164,675
| +190% | +$9.44M |
2016 Q3
3 quarters
|
|
23
SLB Ltd
SLB
$73.4B
| $14.7M | 0.64% |
223,695
+177,787
| +387% | +$12.7M |
2016 Q3
3 quarters
|
|
24
Mondelez International
MDLZ
$82.7B
| $13.7M | 0.59% |
316,653
+153,369
| +94% | +$6.92M |
2016 Q4
2 quarters
|
|
25
Regeneron Pharmaceuticals
REGN
$84.4B
| $13.2M | 0.57% |
+26,921
| New | +$11.8M |
2017 Q2
0 quarters
|
|
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Simplex Trading's Q2 2017 Portfolio in Review
As of Q2 2017, Simplex Trading held 7,527 positions worth $2.3B, down 0.39% from $2.31B the previous quarter. Its ten largest holdings account for 23% of the portfolio.
Simplex Trading withdrew a net $118M in Q2 2017, closing 1,474 positions and reducing 2,319 holdings. Its most notable exit was AT&T, an estimated $19.6M position sold in full.
By sector, the portfolio is most concentrated in Miscellaneous at 40% of assets, up from 40% a quarter earlier, followed by Technology and Communication Services.
Against the trend, Simplex Trading opened a new position in Amgen worth $32.3M.
- Simplex Trading's largest Q2 2017 buy was Amgen: 187,633 shares worth $32.3M.
- Simplex Trading added most to Amazon in Q2 2017, an estimated $83.1M increase.
- Simplex Trading's biggest Q2 2017 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $29.5M.
- Simplex Trading fully exited AT&T in Q2 2017, selling an estimated $19.6M.
- Simplex Trading's ten largest holdings make up 23% of its $2.3B portfolio in Q2 2017.
- Simplex Trading opened 1,408 new positions and closed 1,474 in Q2 2017.
- Simplex Trading's portfolio value fell 0.39% quarter-over-quarter to $2.3B.
Based on Simplex Trading's 13F filing for Q2 2017, filed 12 Jul 2017.