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 | |
|---|---|---|---|---|---|---|
3601
AudioCodes
AUDC
$239M
| $15K | ﹤0.01% |
+2,170
| New | +$16.2K |
|
3602
CALL
Aurinia Pharmaceuticals
AUPH
$1.95B
| $15K | ﹤0.01% |
75
-241
| -76% | -$1.29K |
|
3603
PUT
Axos Financial
AX
$5.58B
| $15K | ﹤0.01% |
372
+50
| +16% | +$1.82K |
|
3604
PUT
Brookfield
BN
$102B
| $15K | ﹤0.01% |
95
+70
| +280% | +$1.01K |
|
3605
CALL
Popular Inc
BPOP
$11B
| $15K | ﹤0.01% |
112
-400
| -78% | -$16.4K |
|
|
SLAI
3606
CALL
DELISTED
SOLAI Ltd ADS
SLAI
| $15K | ﹤0.01% |
+1
| New | +$1.06K |
|
3607
CALL
Cato Corp
CATO
$65.7M
| $15K | ﹤0.01% |
34
-20
| -37% | -$253 |
|
3608
CALL
Cullen/Frost Bankers
CFR
$10.5B
| $15K | ﹤0.01% |
53
-52
| -50% | -$5.43K |
|
3609
CALL
Church & Dwight Co
CHD
$23.7B
| $15K | ﹤0.01% |
52
-29
| -36% | -$1.43K |
|
3610
ClearSign Technologies
CLIR
$25.4M
| $15K | ﹤0.01% |
771
+448
| +139% | +$10.9K |
|
3611
PUT
CNA Financial
CNA
$14.9B
| $15K | ﹤0.01% |
84
+16
| +24% | +$837 |
|
3612
CALL
Corcept Therapeutics
CORT
$9.98B
| $15K | ﹤0.01% |
568
+235
| +71% | +$4.35K |
|
|
CTRA
3613
PUT
DELISTED
Coterra Energy
CTRA
| $15K | ﹤0.01% |
264
-732
| -73% | -$18.8K |
|
3614
CALL
Designer Brands
DBI
$315M
| $15K | ﹤0.01% |
157
-27
| -15% | -$555 |
|
3615
CALL
Dorman Products
DORM
$4.22B
| $15K | ﹤0.01% |
+50
| New | +$3.56K |
|
3616
CALL
Consolidated Edison
ED
$41.4B
| $15K | ﹤0.01% |
140
-44
| -24% | -$3.42K |
|
3617
PUT
Enova International
ENVA
$6.09B
| $15K | ﹤0.01% |
107
+72
| +206% | +$1.45K |
|
3618
PUT
Empire State Realty Trust
ESRT
$1B
| $15K | ﹤0.01% |
49
-49
| -50% | -$887 |
|
3619
iShares MSCI Switzerland ETF
EWL
$2.17B
| $15K | ﹤0.01% |
+441
| New | +$15.7K |
|
3620
CALL
Exelon
EXC
$48.1B
| $15K | ﹤0.01% |
245
+32
| +15% | +$864 |
|
3621
PUT
Diamondback Energy
FANG
$56B
| $15K | ﹤0.01% |
23
-94
| -80% | -$11.8K |
|
3622
US Global Investors
GROW
$36.3M
| $15K | ﹤0.01% |
5,987
+916
| +18% | +$3.19K |
|
3623
CALL
Hilton Worldwide
HLT
$72.4B
| $15K | ﹤0.01% |
274
+258
| +1,613% | +$21.2K |
|
3624
CALL
Hershey
HSY
$37.3B
| $15K | ﹤0.01% |
114
+65
| +133% | +$6.71K |
|
3625
PUT
InterDigital
IDCC
$6.75B
| $15K | ﹤0.01% |
88
-81
| -48% | -$6.2K |
|
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.