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 | |
|---|---|---|---|---|---|---|
|
FTR
2351
PUT
DELISTED
Frontier Communications Corp.
FTR
| $561K | ﹤0.01% |
1,049
-146
| -12% | -$1.19K |
|
|
EGN
2352
PUT
DELISTED
Energen
EGN
| $560K | ﹤0.01% |
+77
| New | +$5.05K |
|
|
EDR
2353
CALL
DELISTED
Education Realty Trust Inc
EDR
| $560K | ﹤0.01% |
+135
| New | +$4.81K |
|
2354
PUT
AGCO
AGCO
$8.78B
| $558K | ﹤0.01% |
92
+74
| +411% | +$4.72K |
|
2355
CALL
SPS Commerce
SPSC
$2.25B
| $558K | ﹤0.01% |
152
-194
| -56% | -$6.88K |
|
2356
PUT
AXIS Capital
AXS
$8.59B
| $556K | ﹤0.01% |
100
| – | – |
|
|
B
2357
PUT
Barrick Mining
B
$62.2B
| $556K | ﹤0.01% |
424
-11
| -3% | -$144 |
|
2358
Nabors Industries
NBR
$1.23B
| $556K | ﹤0.01% |
1,736
+955
| +122% | +$350K |
|
2359
CALL
Zscaler
ZS
$23B
| $554K | ﹤0.01% |
+155
| New | +$4.73K |
|
|
WPX
2360
CALL
DELISTED
WPX Energy, Inc.
WPX
| $553K | ﹤0.01% |
307
+191
| +165% | +$3.27K |
|
2361
EQT Corp
EQT
$33.2B
| $552K | ﹤0.01% |
18,388
+125
| +0.7% | +$3.49K |
|
|
DISH
2362
DELISTED
DISH Network Corp.
DISH
| $552K | ﹤0.01% |
16,426
-6,949
| -30% | -$237K |
|
2363
PUT
Griffon
GFF
$4.16B
| $551K | ﹤0.01% |
310
+306
| +7,650% | +$6.3K |
|
2364
PUT
Gerdau
GGB
$9.44B
| $551K | ﹤0.01% |
1,962
+594
| +43% | +$2.07K |
|
2365
Dave & Buster's
PLAY
$343M
| $550K | ﹤0.01% |
+11,572
| New | +$512K |
|
2366
PUT
Travelers Companies
TRV
$80.8B
| $550K | ﹤0.01% |
45
-189
| -81% | -$24.8K |
|
|
PE
2367
DELISTED
PARSLEY ENERGY INC
PE
| $550K | ﹤0.01% |
+18,183
| New | +$536K |
|
2368
CALL
Flowers Foods
FLO
$1.64B
| $549K | ﹤0.01% |
264
-55
| -17% | -$1.17K |
|
2369
PUT
Canadian Natural Resources
CNQ
$96.9B
| $548K | ﹤0.01% |
310
+151
| +95% | +$2.56K |
|
2370
CALL
Travel + Leisure Co
TNL
$4.54B
| $547K | ﹤0.01% |
144
-23,946
| -99% | -$1.18M |
|
|
XNET
2371
PUT
Xunlei
XNET
$351M
| $546K | ﹤0.01% |
511
-60
| -11% | -$746 |
|
2372
CALL
Zimmer Biomet
ZBH
$17.7B
| $546K | ﹤0.01% |
50
-644
| -93% | -$70.1K |
|
|
WPZ
2373
DELISTED
Williams Partners L.P.
WPZ
| $546K | ﹤0.01% |
13,454
-8,153
| -38% | -$310K |
|
|
PSXP
2374
CALL
DELISTED
PHILLIPS 66 PARTNERS LP
PSXP
| $546K | ﹤0.01% |
+107
| New | +$5.42K |
|
2375
Brunswick
BC
$5.19B
| $545K | ﹤0.01% |
8,464
-2,356
| -22% | -$147K |
|
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.