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 | |
|---|---|---|---|---|---|---|
726
CALL
NetApp
NTAP
$32.9B
| $491K | 0.02% |
544
-75
| -12% | -$4.58K |
|
|
SOHU
727
Sohu.com
SOHU
$336M
| $491K | 0.02% |
15,889
+12,970
| +444% | +$495K |
|
728
CALL
Gilead Sciences
GILD
$161B
| $490K | 0.02% |
4,058
-2,027
| -33% | -$161K |
|
729
Smith & Wesson
SWBI
$655M
| $487K | 0.02% |
61,405
+8,677
| +16% | +$73.1K |
|
|
ICPT
730
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $487K | 0.02% |
7,931
+4,075
| +106% | +$246K |
|
731
Fair Isaac
FICO
$28.7B
| $485K | 0.02% |
+2,868
| New | +$479K |
|
732
Green Dot
GDOT
$753M
| $485K | 0.02% |
+7,561
| New | +$477K |
|
733
Canadian Imperial Bank of Commerce
CM
$107B
| $484K | 0.02% |
+10,984
| New | +$515K |
|
734
PUT
Lockheed Martin
LMT
$134B
| $483K | 0.02% |
590
-488
| -45% | -$166K |
|
735
PUT
Delta Air Lines
DAL
$55.9B
| $482K | 0.02% |
2,663
-188
| -7% | -$10.4K |
|
736
CALL
SLB Ltd
SLB
$78.4B
| $481K | 0.02% |
2,530
-606
| -19% | -$42.3K |
|
|
COHR
737
PUT
DELISTED
Coherent Inc
COHR
| $481K | 0.02% |
139
+62
| +81% | +$15K |
|
738
Unilever
UL
$131B
| $480K | 0.02% |
7,691
-19,657
| -72% | -$1.2M |
|
739
CALL
Marathon Petroleum
MPC
$90.3B
| $478K | 0.02% |
654
-288
| -31% | -$19.8K |
|
740
PUT
Philip Morris
PM
$301B
| $478K | 0.02% |
1,744
-1,349
| -44% | -$141K |
|
|
HA
741
CALL
DELISTED
Hawaiian Holdings, Inc.
HA
| $478K | 0.02% |
9,770
+9,631
| +6,929% | +$360K |
|
742
Mattel
MAT
$4.17B
| $477K | 0.02% |
36,310
-39,289
| -52% | -$613K |
|
743
Dentsply Sirona
XRAY
$2.59B
| $476K | 0.02% |
+9,480
| New | +$558K |
|
744
International Flavors & Fragrances
IFF
$19.4B
| $474K | 0.02% |
3,466
+2,716
| +362% | +$394K |
|
745
EQT Corp
EQT
$33.2B
| $472K | 0.02% |
18,263
+6,679
| +58% | +$192K |
|
746
CALL
Capri Holdings
CPRI
$1.77B
| $471K | 0.02% |
880
-431
| -33% | -$27.4K |
|
|
AXON
747
CALL
Axon Enterprise
AXON
$40.5B
| $470K | 0.02% |
365
+95
| +35% | +$2.96K |
|
|
GES
748
DELISTED
Guess Inc
GES
| $470K | 0.02% |
22,705
+17,393
| +327% | +$290K |
|
749
PUT
Applied Materials
AMAT
$426B
| $469K | 0.02% |
2,912
-667
| -19% | -$37.1K |
|
750
CALL
Ulta Beauty
ULTA
$20.4B
| $469K | 0.02% |
1,392
+634
| +84% | +$137K |
|
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.