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 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2551
PUT
Ichor Holdings
ICHR
$3.02B
| $454K | ﹤0.01% |
214
+91
| +74% | +$2.17K |
|
|
UCTT
2552
CALL
Ultra Clean Holdings
UCTT
$4.16B
| $454K | ﹤0.01% |
274
+142
| +108% | +$2.49K |
|
|
CTRL
2553
CALL
DELISTED
Control4 Corporation
CTRL
| $454K | ﹤0.01% |
187
+118
| +171% | +$2.76K |
|
2554
ASML
ASML
$675B
| $453K | ﹤0.01% |
+2,289
| New | +$460K |
|
2555
PUT
PetMed Express
PETS
$42.5M
| $453K | ﹤0.01% |
103
+46
| +81% | +$1.78K |
|
2556
PUT
Stewart Information Services
STC
$2.05B
| $452K | ﹤0.01% |
105
+21
| +25% | +$901 |
|
2557
CALL
Webster Financial
WBS
$12.3B
| $452K | ﹤0.01% |
71
+43
| +154% | +$2.68K |
|
|
ITCI
2558
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $452K | ﹤0.01% |
25,587
-6,255
| -20% | -$127K |
|
|
BMCH
2559
CALL
DELISTED
BMC Stock Holdings, Inc
BMCH
| $452K | ﹤0.01% |
217
+67
| +45% | +$1.33K |
|
|
FRAN
2560
DELISTED
Francesca's Holdings Corporation
FRAN
| $452K | ﹤0.01% |
4,994
+4,499
| +909% | +$309K |
|
2561
PUT
Iron Mountain
IRM
$38.2B
| $451K | ﹤0.01% |
129
-40
| -24% | -$1.35K |
|
|
HCR
2562
CALL
DELISTED
Hi-Crush Inc. Common Stock
HCR
| $451K | ﹤0.01% |
383
+31
| +9% | +$385 |
|
2563
GDS Holdings
GDS
$6.34B
| $450K | ﹤0.01% |
11,226
+8,761
| +355% | +$301K |
|
2564
Natural Health Trends
NHTC
$15.4M
| $450K | ﹤0.01% |
18,020
+7,664
| +74% | +$160K |
|
2565
PUT
Toyota
TM
$210B
| $450K | ﹤0.01% |
35
+12
| +52% | +$1.58K |
|
2566
CALL
Charles River Laboratories
CRL
$10.9B
| $449K | ﹤0.01% |
40
+26
| +186% | +$2.81K |
|
|
GRMN
2567
Garmin
GRMN
$46.9B
| $449K | ﹤0.01% |
+7,372
| New | +$443K |
|
|
TWOU
2568
DELISTED
2U Inc
TWOU
| $449K | ﹤0.01% |
179
+104
| +139% | +$276K |
|
|
QIWI
2569
DELISTED
QIWI PLC
QIWI
| $449K | ﹤0.01% |
28,520
+10,292
| +56% | +$176K |
|
2570
CALL
Casella Waste Systems
CWST
$5.69B
| $448K | ﹤0.01% |
175
+111
| +173% | +$2.74K |
|
|
ACR
2571
PUT
ACRES Commercial Realty
ACR
$126M
| $447K | ﹤0.01% |
+147
| New | +$4.43K |
|
2572
PUT
Cooper Companies
COO
$13.7B
| $447K | ﹤0.01% |
76
-244
| -76% | -$13.9K |
|
|
FITB
2573
PUT
Fifth Third Bancorp
FITB
$52B
| $447K | ﹤0.01% |
156
-82
| -34% | -$2.6K |
|
2574
CALL
Inogen
INGN
$167M
| $447K | ﹤0.01% |
24
+20
| +500% | +$3.33K |
|
2575
CALL
Dave & Buster's
PLAY
$343M
| $447K | ﹤0.01% |
94
-16,515
| -99% | -$731K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.