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 | |
|---|---|---|---|---|---|---|
|
26
CALL
Alibaba
BABA
$283B
| $11.6M | 0.51% |
11,195
-5,571
| -33% | -$1.05M |
|
27
Qualcomm
QCOM
$183B
| $11.6M | 0.51% |
209,004
+187,363
| +866% | +$11.9M |
|
28
CALL
Apple
AAPL
$4.81T
| $11.4M | 0.5% |
69,052
+10,520
| +18% | +$453K |
|
29
CALL
Lockheed Martin
LMT
$117B
| $11.1M | 0.49% |
31,583
+31,050
| +5,826% | +$10.6M |
|
|
30
PUT
Netflix
NFLX
$286B
| $11M | 0.48% |
96,460
-11,420
| -11% | -$311K |
|
31
SLB Ltd
SLB
$69.7B
| $10.9M | 0.48% |
168,323
+149,648
| +801% | +$10.5M |
|
|
32
CALL
Alphabet (Google) Class A
GOOGL
$4.24T
| $10.7M | 0.47% |
107,080
+23,880
| +29% | +$1.32M |
|
33
CALL
NVIDIA
NVDA
$5.02T
| $10.4M | 0.46% |
215,280
-93,840
| -30% | -$551K |
|
34
American International
AIG
$42.5B
| $10.2M | 0.45% |
+188,009
| New | +$11.1M |
|
35
Advanced Micro Devices
AMD
$888B
| $10.2M | 0.45% |
1,014,115
+698,706
| +222% | +$8.28M |
|
36
Adobe
ADBE
$90.3B
| $9.67M | 0.43% |
+44,759
| New | +$9.1M |
|
37
JPMorgan Chase
JPM
$918B
| $9.33M | 0.41% |
+84,819
| New | +$9.6M |
|
|
38
CALL
Boeing
BA
$161B
| $9.18M | 0.4% |
6,573
+3,639
| +124% | +$1.23M |
|
|
TWTR
39
DELISTED
Twitter, Inc.
TWTR
| $9.08M | 0.4% |
+313,108
| New | +$9.18M |
|
40
State Street Consumer Discretionary Select Sector SPDR ETF
XLY
$22.5B
| $9.01M | 0.4% |
+177,878
| New | +$9.27M |
|
41
Caterpillar
CAT
$410B
| $8.95M | 0.39% |
60,718
+39,002
| +180% | +$6.16M |
|
|
VXX
42
CALL
DELISTED
iPath S&P 500 VIX Short-Term Futures ETN due 1/30/2019
VXX
| $8.87M | 0.39% |
19,545
+9,884
| +102% | +$375K |
|
43
MetLife
MET
$59.8B
| $8.76M | 0.39% |
190,954
+174,159
| +1,037% | +$8.45M |
|
44
Expedia Group
EXPE
$31.8B
| $8.69M | 0.38% |
+78,716
| New | +$9.16M |
|
|
45
CALL
Micron Technology
MU
$1.1T
| $8.66M | 0.38% |
20,392
+4,857
| +31% | +$232K |
|
|
46
PUT
Apple
AAPL
$4.81T
| $8.61M | 0.38% |
48,208
-2,748
| -5% | -$118K |
|
|
CELG
47
DELISTED
Celgene Corp
CELG
| $8.36M | 0.37% |
93,724
-186,470
| -67% | -$17.9M |
|
|
48
Apple
AAPL
$4.81T
| $8.35M | 0.37% |
198,976
-141,400
| -42% | -$6.09M |
|
49
AT&T
T
$155B
| $8.01M | 0.35% |
297,528
-98,585
| -25% | -$2.74M |
|
50
CALL
Berkshire Hathaway Class B
BRK.B
$1.06T
| $8M | 0.35% |
2,678
-801
| -23% | -$164K |
|
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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.