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 | |
|---|---|---|---|---|---|---|
|
SEP
1176
DELISTED
Spectra Engy Parters Lp
SEP
| $221K | 0.01% |
6,592
+1,954
| +42% | +$78K |
|
1177
Acacia Research
ACTG
$450M
| $220K | 0.01% |
63,040
+36,696
| +139% | +$135K |
|
1178
Viasat
VSAT
$9.79B
| $219K | 0.01% |
+3,339
| New | +$244K |
|
1179
Heron Therapeutics
HRTX
$86.3M
| $218K | 0.01% |
+7,909
| New | +$179K |
|
|
STAY
1180
DELISTED
Extended Stay America, Inc. Paired Share Unit
STAY
| $218K | 0.01% |
11,034
-1,155
| -9% | -$22.8K |
|
1181
CALL
LCI Industries
LCII
$2.51B
| $217K | 0.01% |
2,144
+2,091
| +3,945% | +$240K |
|
1182
PUT
iShares MSCI Global Gold Miners ETF
RING
$2.31B
| $217K | 0.01% |
2,706
+1,554
| +135% | +$28.4K |
|
1183
CALL
Vanguard FTSE Europe ETF
VGK
$30B
| $217K | 0.01% |
2,510
+2,134
| +568% | +$128K |
|
1184
PUT
Blackstone
BX
$104B
| $216K | 0.01% |
2,653
+1,175
| +79% | +$40.1K |
|
1185
CALL
DuPont de Nemours
DD
$18.6B
| $216K | 0.01% |
595
-339
| -36% | -$61.3K |
|
1186
iShares MSCI Taiwan ETF
EWT
$10B
| $216K | 0.01% |
+5,647
| New | +$213K |
|
1187
MillerKnoll
MLKN
$1.5B
| $215K | 0.01% |
+6,760
| New | +$256K |
|
1188
ProShares Ultra Technology
ROM
$1.13B
| $215K | 0.01% |
+18,672
| New | +$228K |
|
1189
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$746M
| $215K | 0.01% |
1,306
+635
| +95% | +$14.2K |
|
1190
PUT
Wayfair
W
$11.1B
| $215K | 0.01% |
414
-901
| -69% | -$75.7K |
|
1191
FirstCash
FCFS
$8.55B
| $214K | 0.01% |
2,636
+1,192
| +83% | +$88.9K |
|
1192
CALL
Hormel Foods
HRL
$13.9B
| $214K | 0.01% |
5,951
+5,768
| +3,152% | +$196K |
|
1193
MakeMyTrip
MMYT
$4.67B
| $214K | 0.01% |
6,195
+4,048
| +189% | +$129K |
|
1194
Comstock Resources
CRK
$3.97B
| $213K | 0.01% |
29,265
-84
| -0.3% | -$678 |
|
1195
Helmerich & Payne
HP
$3.53B
| $213K | 0.01% |
3,215
+1,195
| +59% | +$80.6K |
|
1196
LPL Financial
LPLA
$26.3B
| $213K | 0.01% |
+3,490
| New | +$216K |
|
1197
PUT
Lumen
LUMN
$6.53B
| $213K | 0.01% |
1,256
+357
| +40% | +$6.19K |
|
1198
CALL
Shutterstock
SSTK
$205M
| $213K | 0.01% |
240
-91
| -27% | -$4.3K |
|
|
OPTU
1199
PUT
Optimum Communications Inc
OPTU
$316M
| $211K | 0.01% |
507
+216
| +74% | +$4.42K |
|
1200
CALL
Capital One
COF
$124B
| $211K | 0.01% |
624
-263
| -30% | -$26.2K |
|
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.