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 | |
|---|---|---|---|---|---|---|
951
Southern Copper
SCCO
$141B
| $326K | 0.01% |
6,496
-1,959
| -23% | -$92.8K |
|
952
PUT
ProShares UltraShort Industrials
SIJ
$5.74M
| $326K | 0.01% |
49
+11
| +29% | +$2.83K |
|
953
Gyre Therapeutics
GYRE
$662M
| $325K | 0.01% |
+1,680
| New | +$313K |
|
|
SFIX
954
Stitch Fix
SFIX
$478M
| $325K | 0.01% |
16,031
+10,581
| +194% | +$229K |
|
955
MPLX
MPLX
$59.5B
| $323K | 0.01% |
9,781
+2,151
| +28% | +$77.1K |
|
956
PUT
YPF
YPF
$20.2B
| $323K | 0.01% |
2,229
-1,586
| -42% | -$36.7K |
|
957
CALL
Okta
OKTA
$24.1B
| $322K | 0.01% |
235
+186
| +380% | +$6.21K |
|
958
Rithm Capital
RITM
$5.09B
| $321K | 0.01% |
19,567
-11,414
| -37% | -$194K |
|
959
CALL
Truist Financial
TFC
$63.2B
| $320K | 0.01% |
982
+155
| +19% | +$8.35K |
|
|
NXTM
960
CALL
DELISTED
NxStage Medical Inc.
NXTM
| $320K | 0.01% |
12,277
+11,903
| +3,183% | +$290K |
|
961
EPAM Systems
EPAM
$4.69B
| $317K | 0.01% |
2,774
-6,045
| -69% | -$691K |
|
962
PUT
SM Energy
SM
$7.96B
| $317K | 0.01% |
422
-152
| -26% | -$3.29K |
|
963
Cheniere Energy
CQP
$31.8B
| $316K | 0.01% |
+10,870
| New | +$326K |
|
964
Public Storage
PSA
$60.2B
| $315K | 0.01% |
+1,575
| New | +$307K |
|
965
CALL
Mettler-Toledo International
MTD
$26.8B
| $312K | 0.01% |
+544
| New | +$342K |
|
|
HTT
966
PUT
High Templar Tech Ltd
HTT
$377M
| $312K | 0.01% |
828
+361
| +77% | +$4.91K |
|
|
ONC
967
CALL
BeOne Medicines Ltd
ONC
$33.8B
| $312K | 0.01% |
239
+227
| +1,892% | +$30.7K |
|
|
WCG
968
CALL
DELISTED
Wellcare Health Plans, Inc.
WCG
| $312K | 0.01% |
1,623
+1,579
| +3,589% | +$316K |
|
|
KYNB
969
PUT
Kyntra Bio
KYNB
$28.5M
| $311K | 0.01% |
16
| – | – |
|
970
El Pollo Loco
LOCO
$485M
| $310K | 0.01% |
+32,657
| New | +$324K |
|
971
Martin Marietta Materials
MLM
$33.6B
| $310K | 0.01% |
+1,497
| New | +$324K |
|
972
PUT
Electronic Arts
EA
$52.4B
| $309K | 0.01% |
1,471
-1,274
| -46% | -$154K |
|
973
Direxion Daily MSCI Emerging Markets Bull 3X ETF
EDC
$147M
| $309K | 0.01% |
+2,431
| New | +$337K |
|
974
PUT
MiMedx Group
MDXG
$626M
| $309K | 0.01% |
629
-325
| -34% | -$3.78K |
|
975
DXC Technology
DXC
$1.63B
| $308K | 0.01% |
3,548
-3,069
| -46% | -$269K |
|
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.