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 | |
|---|---|---|---|---|---|---|
51
Bank of America
BAC
$430B
| $7.84M | 0.34% |
+261,342
| New | +$8.21M |
|
52
CALL
Microsoft
MSFT
$2.95T
| $7.73M | 0.34% |
9,264
+86
| +0.9% | +$7.87K |
|
53
CALL
Intuitive Surgical
ISRG
$124B
| $7.6M | 0.33% |
28,284
+24,810
| +714% | +$3.46M |
|
54
Baidu
BIDU
$36.8B
| $7.58M | 0.33% |
33,951
-56,172
| -62% | -$13.8M |
|
|
55
PUT
Boeing
BA
$161B
| $7.47M | 0.33% |
7,991
+2,563
| +47% | +$866K |
|
56
Bristol-Myers Squibb
BMY
$124B
| $7.42M | 0.33% |
+117,278
| New | +$7.54M |
|
57
CALL
Invesco QQQ Trust
QQQ
$471B
| $7.38M | 0.32% |
18,142
+2,464
| +16% | +$407K |
|
58
PUT
State Street Materials Select Sector SPDR ETF
XLB
$8.31B
| $7.04M | 0.31% |
84,614
+20,780
| +33% | +$630K |
|
|
59
PUT
Micron Technology
MU
$1.1T
| $6.93M | 0.3% |
18,410
+3,390
| +23% | +$162K |
|
60
Goldman Sachs
GS
$320B
| $6.91M | 0.3% |
+27,446
| New | +$7.15M |
|
61
PUT
NVIDIA
NVDA
$5.02T
| $6.84M | 0.3% |
340,680
-9,640
| -3% | -$56.6K |
|
62
State Street Energy Select Sector SPDR ETF
XLE
$38.7B
| $6.84M | 0.3% |
+202,898
| New | +$7.18M |
|
63
CALL
American Tower
AMT
$77.8B
| $6.84M | 0.3% |
45,244
+45,072
| +26,205% | +$6.35M |
|
64
Colgate-Palmolive
CL
$72.4B
| $6.75M | 0.3% |
94,238
+6,422
| +7% | +$462K |
|
65
IBM
IBM
$198B
| $6.74M | 0.3% |
45,976
-40,767
| -47% | -$6.17M |
|
|
ESRX
66
DELISTED
Express Scripts Holding Company
ESRX
| $6.72M | 0.3% |
+97,296
| New | +$7.42M |
|
|
RTN
67
DELISTED
Raytheon Company
RTN
| $6.63M | 0.29% |
30,714
+24,145
| +368% | +$5M |
|
68
McDonald's
MCD
$188B
| $6.53M | 0.29% |
41,762
-15,067
| -27% | -$2.48M |
|
69
Johnson & Johnson
JNJ
$603B
| $6.53M | 0.29% |
+50,942
| New | +$6.89M |
|
|
CELG
70
PUT
DELISTED
Celgene Corp
CELG
| $6.02M | 0.26% |
5,159
+477
| +10% | +$45.8K |
|
71
UnitedHealth
UNH
$396B
| $6.02M | 0.26% |
28,118
-15,112
| -35% | -$3.45M |
|
72
State Street Technology Select Sector SPDR ETF
XLK
$118B
| $5.87M | 0.26% |
+179,514
| New | +$6.03M |
|
73
ProShares UltraPro QQQ
TQQQ
$34.7B
| $5.84M | 0.26% |
973,488
-183,504
| -16% | -$1.24M |
|
|
74
Microsoft
MSFT
$2.95T
| $5.67M | 0.25% |
62,183
-85,386
| -58% | -$7.81M |
|
75
Wells Fargo
WFC
$266B
| $5.61M | 0.25% |
+107,029
| New | +$6.36M |
|
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.