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 | |
|---|---|---|---|---|---|---|
351
Lincoln National
LNC
$7.81B
| $1.12M | 0.05% |
+15,292
| New | +$1.2M |
|
352
CALL
Five Below
FIVE
$11.1B
| $1.11M | 0.05% |
594
+93
| +19% | +$6.27K |
|
|
AABA
353
CALL
DELISTED
Altaba Inc
AABA
| $1.11M | 0.05% |
3,103
+472
| +18% | +$35.6K |
|
354
CALL
Valero Energy
VLO
$90.6B
| $1.11M | 0.05% |
2,434
+557
| +30% | +$52K |
|
355
CALL
Cummins
CMI
$91.8B
| $1.11M | 0.05% |
5,803
+5,594
| +2,677% | +$961K |
|
356
PUT
Deutsche Bank
DB
$65.3B
| $1.11M | 0.05% |
1,890
-35
| -2% | -$590 |
|
357
Burlington
BURL
$21.4B
| $1.1M | 0.05% |
+8,286
| New | +$1.02M |
|
358
Lamb Weston
LW
$6.79B
| $1.1M | 0.05% |
+18,828
| New | +$1.07M |
|
359
PUT
Shopify
SHOP
$145B
| $1.1M | 0.05% |
9,630
-7,780
| -45% | -$101K |
|
360
Goodyear
GT
$2.02B
| $1.09M | 0.05% |
41,228
+24,580
| +148% | +$760K |
|
361
BlackBerry
BB
$5.06B
| $1.09M | 0.05% |
95,125
+59,534
| +167% | +$757K |
|
362
CALL
RH
RH
$3.14B
| $1.09M | 0.05% |
1,167
+468
| +67% | +$41.5K |
|
363
CALL
Fastenal
FAST
$53B
| $1.09M | 0.05% |
3,880
-1,080
| -22% | -$14.9K |
|
|
HES
364
DELISTED
Hess
HES
| $1.09M | 0.05% |
21,545
-5,521
| -20% | -$271K |
|
365
CALL
Chipotle Mexican Grill
CMG
$41.1B
| $1.09M | 0.05% |
71,750
-181,150
| -72% | -$1.14M |
|
366
Walt Disney
DIS
$161B
| $1.09M | 0.05% |
+10,843
| New | +$1.15M |
|
367
PUT
Berkshire Hathaway Class B
BRK.B
$1.06T
| $1.09M | 0.05% |
4,017
+1,333
| +50% | +$274K |
|
368
PUT
Wynn Resorts
WYNN
$10B
| $1.08M | 0.05% |
2,120
-2,598
| -55% | -$449K |
|
|
MNK
369
DELISTED
MALLINCKRODT PUBLIC LIMITED COMPANY
MNK
| $1.07M | 0.05% |
74,241
+43,763
| +144% | +$790K |
|
|
WW
370
CALL
DELISTED
WW International
WW
| $1.07M | 0.05% |
574
-228
| -28% | -$14.6K |
|
371
PUT
Gilead Sciences
GILD
$162B
| $1.07M | 0.05% |
2,265
-3,111
| -58% | -$247K |
|
372
Ashland
ASH
$3.05B
| $1.07M | 0.05% |
15,322
+9,021
| +143% | +$650K |
|
373
CALL
AutoZone
AZO
$47.7B
| $1.07M | 0.05% |
284
-889
| -76% | -$636K |
|
374
CALL
Qualcomm
QCOM
$180B
| $1.06M | 0.05% |
7,512
-2,048
| -21% | -$130K |
|
|
IMMU
375
DELISTED
Immunomedics Inc
IMMU
| $1.05M | 0.05% |
+72,147
| New | +$1.18M |
|
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.