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 | |
|---|---|---|---|---|---|---|
151
CALL
Shopify
SHOP
$160B
| $2.61M | 0.11% |
176,920
+169,010
| +2,137% | +$2.19M |
|
152
Whirlpool
WHR
$2.36B
| $2.6M | 0.11% |
16,983
+13,584
| +400% | +$2.27M |
|
153
CALL
Goldman Sachs
GS
$320B
| $2.58M | 0.11% |
4,437
+1,212
| +38% | +$316K |
|
154
ProShares Trust UltraShort Lehman 20+ Year Treasury
TBT
$291M
| $2.57M | 0.11% |
+70,898
| New | +$2.63M |
|
155
Illumina
ILMN
$27.9B
| $2.57M | 0.11% |
11,168
-1,972
| -15% | -$452K |
|
156
Dollar Tree
DLTR
$24.3B
| $2.56M | 0.11% |
26,997
+3,991
| +17% | +$418K |
|
157
CALL
Union Pacific
UNP
$176B
| $2.53M | 0.11% |
3,109
-1,146
| -27% | -$154K |
|
158
PUT
NetEase
NTES
$82.9B
| $2.48M | 0.11% |
5,465
+605
| +12% | +$38K |
|
|
PF
159
CALL
DELISTED
Pinnacle Foods, Inc.
PF
| $2.47M | 0.11% |
45,673
+45,342
| +13,698% | +$2.62M |
|
160
eBay
EBAY
$50.7B
| $2.46M | 0.11% |
61,120
+9,466
| +18% | +$392K |
|
161
SAP
SAP
$180B
| $2.44M | 0.11% |
23,157
+22,090
| +2,070% | +$2.39M |
|
162
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.32B
| $2.43M | 0.11% |
60,435
+25,743
| +74% | +$1.07M |
|
163
Lennar Class A
LEN
$20B
| $2.43M | 0.11% |
42,580
+16,095
| +61% | +$971K |
|
164
PUT
Citigroup
C
$223B
| $2.42M | 0.11% |
8,057
-1,461
| -15% | -$110K |
|
165
CALL
Cisco
CSCO
$442B
| $2.42M | 0.11% |
6,119
+1,404
| +30% | +$59.5K |
|
|
UCD
166
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $2.42M | 0.11% |
5,960
-16,410
| -73% | -$6.66M |
|
167
Dell
DELL
$261B
| $2.36M | 0.1% |
114,772
+112,010
| +4,055% | +$2.41M |
|
168
Madison Square Garden
MSGS
$9.58B
| $2.35M | 0.1% |
13,410
+11,726
| +696% | +$1.9M |
|
169
PUT
Kraft Heinz
KHC
$30.6B
| $2.35M | 0.1% |
2,649
+494
| +23% | +$35.4K |
|
170
Fomento Económico Mexicano
FMX
$44.4B
| $2.32M | 0.1% |
25,336
+24,913
| +5,890% | +$2.33M |
|
171
Direxion Daily Small Cap Bull 3x ETF
TNA
$1.42B
| $2.29M | 0.1% |
+33,943
| New | +$2.44M |
|
|
MOMO
172
CALL
Hello Group
MOMO
$886M
| $2.28M | 0.1% |
57,778
+57,205
| +9,983% | +$1.82M |
|
173
PUT
SLB Ltd
SLB
$69.7B
| $2.26M | 0.1% |
4,110
-1,313
| -24% | -$91.7K |
|
174
CALL
JPMorgan Chase
JPM
$918B
| $2.25M | 0.1% |
6,200
+1,154
| +23% | +$131K |
|
175
Salesforce
CRM
$139B
| $2.21M | 0.1% |
+19,012
| New | +$2.18M |
|
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.