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 | |
|---|---|---|---|---|---|---|
|
CALA
1951
DELISTED
Calithera Biosciences, Inc
CALA
| $84K | ﹤0.01% |
+673
| New | +$105K |
|
|
NRE
1952
DELISTED
NorthStar Realty Europe Corp.
NRE
| $84K | ﹤0.01% |
6,503
+6,395
| +5,921% | +$75.1K |
|
|
SGG
1953
DELISTED
iPath Bloomberg Sugar Subindex Total Return ETN due June 24, 2038
SGG
| $84K | ﹤0.01% |
3,433
+3,282
| +2,174% | +$88.9K |
|
|
CRC
1954
DELISTED
California Resources Corporation
CRC
| $84K | ﹤0.01% |
+4,901
| New | +$92K |
|
1955
Ally Financial
ALLY
$13.1B
| $83K | ﹤0.01% |
+3,076
| New | +$88.2K |
|
|
FOLD
1956
CALL
DELISTED
Amicus Therapeutics
FOLD
| $83K | ﹤0.01% |
386
+8
| +2% | +$122 |
|
1957
CALL
Genesco
GCO
$396M
| $83K | ﹤0.01% |
164
-212
| -56% | -$7.87K |
|
1958
PUT
IPG Photonics
IPGP
$3.89B
| $83K | ﹤0.01% |
132
-90
| -41% | -$22.2K |
|
1959
CALL
MBIA
MBI
$288M
| $83K | ﹤0.01% |
312
-1,410
| -82% | -$11.3K |
|
1960
PUT
Ovintiv
OVV
$17.5B
| $83K | ﹤0.01% |
89
-12
| -12% | -$712 |
|
1961
PUT
Vodafone
VOD
$34.9B
| $83K | ﹤0.01% |
631
+393
| +165% | +$11.7K |
|
1962
PUT
Axalta
AXTA
$7.01B
| $82K | ﹤0.01% |
455
-322
| -41% | -$10.1K |
|
1963
Conduent
CNDT
$230M
| $82K | ﹤0.01% |
4,449
-30,744
| -87% | -$541K |
|
1964
PUT
Covenant Logistics
CVLG
$1.18B
| $82K | ﹤0.01% |
+1,336
| New | +$18.7K |
|
1965
CALL
Dell
DELL
$283B
| $82K | ﹤0.01% |
1,461
+837
| +134% | +$18K |
|
1966
PUT
DaVita
DVA
$15.1B
| $82K | ﹤0.01% |
144
-112
| -44% | -$8.23K |
|
1967
CALL
Oneok
OKE
$58.7B
| $82K | ﹤0.01% |
1,180
+1,048
| +794% | +$60.1K |
|
1968
PUT
RH
RH
$3.3B
| $82K | ﹤0.01% |
857
-433
| -34% | -$38.4K |
|
1969
CALL
iShares Silver Trust
SLV
$28.1B
| $82K | ﹤0.01% |
1,133
-1,298
| -53% | -$20.5K |
|
1970
Xylem
XYL
$28.5B
| $82K | ﹤0.01% |
+1,077
| New | +$79.6K |
|
|
NAV
1971
PUT
DELISTED
Navistar International
NAV
| $82K | ﹤0.01% |
379
-698
| -65% | -$28.1K |
|
1972
AAR Corp
AIR
$5.15B
| $81K | ﹤0.01% |
1,837
-2,236
| -55% | -$92.8K |
|
1973
PUT
Pultegroup
PHM
$24.5B
| $81K | ﹤0.01% |
660
-241
| -27% | -$7.47K |
|
1974
Stewart Information Services
STC
$2.05B
| $81K | ﹤0.01% |
1,844
+1,686
| +1,067% | +$72.6K |
|
1975
Standex International
SXI
$3.68B
| $81K | ﹤0.01% |
+852
| New | +$85.3K |
|
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.