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 | |
|---|---|---|---|---|---|---|
2201
PUT
Prologis
PLD
$138B
| $650K | ﹤0.01% |
+99
| New | +$6.37K |
|
|
SFIX
2202
CALL
Stitch Fix
SFIX
$478M
| $650K | ﹤0.01% |
237
+171
| +259% | +$3.87K |
|
2203
PUT
Designer Brands
DBI
$277M
| $648K | ﹤0.01% |
251
+59
| +31% | +$1.41K |
|
|
SPPI
2204
CALL
DELISTED
Spectrum Pharmaceuticals Inc
SPPI
| $647K | ﹤0.01% |
309
+201
| +186% | +$3.72K |
|
2205
CALL
Enphase Energy
ENPH
$4.84B
| $646K | ﹤0.01% |
960
+144
| +18% | +$745 |
|
|
GRMN
2206
CALL
Garmin
GRMN
$46.9B
| $646K | ﹤0.01% |
106
-149
| -58% | -$8.95K |
|
2207
Stratasys
SSYS
$697M
| $646K | ﹤0.01% |
33,799
+24,297
| +256% | +$480K |
|
|
USCR
2208
CALL
DELISTED
U S Concrete, Inc.
USCR
| $645K | ﹤0.01% |
123
+69
| +128% | +$4.1K |
|
|
CLDR
2209
PUT
DELISTED
Cloudera, Inc.
CLDR
| $643K | ﹤0.01% |
472
+415
| +728% | +$6.33K |
|
2210
CALL
Axos Financial
AX
$5.45B
| $642K | ﹤0.01% |
157
-171
| -52% | -$7.11K |
|
2211
PUT
B&G Foods
BGS
$285M
| $642K | ﹤0.01% |
215
-53
| -20% | -$1.42K |
|
2212
Ericsson
ERIC
$30.7B
| $642K | ﹤0.01% |
83,759
+62,817
| +300% | +$459K |
|
|
ORBK
2213
CALL
DELISTED
Orbotech Ltd
ORBK
| $642K | ﹤0.01% |
104
-47
| -31% | -$2.9K |
|
2214
CALL
Editas Medicine
EDIT
$399M
| $641K | ﹤0.01% |
179
-40
| -18% | -$1.42K |
|
2215
CALL
H&R Block
HRB
$5.18B
| $640K | ﹤0.01% |
281
+67
| +31% | +$1.78K |
|
2216
Hexcel
HXL
$8.32B
| $640K | ﹤0.01% |
+9,655
| New | +$659K |
|
2217
PUT
Medifast
MED
$108M
| $640K | ﹤0.01% |
40
+33
| +471% | +$4.22K |
|
2218
PUT
HubSpot
HUBS
$10.5B
| $639K | ﹤0.01% |
51
-319
| -86% | -$37.8K |
|
|
ARRY
2219
DELISTED
Array Biopharma Inc
ARRY
| $639K | ﹤0.01% |
38,087
+36,564
| +2,401% | +$582K |
|
|
VRNT
2220
CALL
DELISTED
Verint Systems
VRNT
| $638K | ﹤0.01% |
283
-33
| -10% | -$717 |
|
|
ITCI
2221
CALL
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $637K | ﹤0.01% |
361
+157
| +77% | +$3.19K |
|
2222
Trinity Industries
TRN
$2.97B
| $636K | ﹤0.01% |
+25,810
| New | +$621K |
|
2223
CALL
Arch Capital
ACGL
$36.1B
| $635K | ﹤0.01% |
240
-237
| -50% | -$6.37K |
|
2224
PUT
Kirby Corp
KEX
$7.95B
| $635K | ﹤0.01% |
+76
| New | +$6.6K |
|
2225
CALL
Ashland
ASH
$3.04B
| $633K | ﹤0.01% |
81
-407
| -83% | -$30.3K |
|
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.