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 | |
|---|---|---|---|---|---|---|
4051
PUT
Brunswick
BC
$5.23B
| $122K | ﹤0.01% |
19
-25
| -57% | -$1.56K |
|
|
DVAX
4052
CALL
DELISTED
Dynavax Technologies
DVAX
| $122K | ﹤0.01% |
80
-5,484
| -99% | -$94.8K |
|
|
LITS
4053
CALL
Lite Strategy Inc
LITS
$32.4M
| $122K | ﹤0.01% |
16
+11
| +220% | +$674 |
|
4054
OneMain Financial
OMF
$7.27B
| $122K | ﹤0.01% |
+3,665
| New | +$119K |
|
|
TWTR
4055
DELISTED
Twitter, Inc.
TWTR
| $122K | ﹤0.01% |
2,800
-310,308
| -99% | -$10.9M |
|
4056
PUT
Cadence Design Systems
CDNS
$91.8B
| $121K | ﹤0.01% |
28
+23
| +460% | +$946 |
|
4057
CALL
CDW
CDW
$18.9B
| $121K | ﹤0.01% |
15
-10
| -40% | -$774 |
|
|
CTLP
4058
DELISTED
Cantaloupe
CTLP
| $121K | ﹤0.01% |
8,687
+3,315
| +62% | +$37.7K |
|
4059
CALL
Future Fuel
FF
$205M
| $121K | ﹤0.01% |
+87
| New | +$1.12K |
|
4060
CALL
Warrior Met Coal
HCC
$4.17B
| $121K | ﹤0.01% |
44
-246
| -85% | -$6.48K |
|
4061
CALL
Hilltop Holdings
HTH
$2.26B
| $121K | ﹤0.01% |
55
+1
| +2% | +$23 |
|
4062
CALL
Vicor
VICR
$8.33B
| $121K | ﹤0.01% |
28
-21
| -43% | -$812 |
|
4063
PUT
Cincinnati Financial
CINF
$27.8B
| $120K | ﹤0.01% |
+18
| New | +$1.28K |
|
4064
LGI Homes
LGIH
$1.35B
| $120K | ﹤0.01% |
2,080
-1,761
| -46% | -$114K |
|
4065
Pampa Energía
PAM
$4.57B
| $120K | ﹤0.01% |
+3,360
| New | +$173K |
|
4066
Pentair
PNR
$10.8B
| $120K | ﹤0.01% |
2,870
+2,097
| +271% | +$94.2K |
|
4067
Simply Good Foods
SMPL
$907M
| $120K | ﹤0.01% |
+8,342
| New | +$112K |
|
|
WCN
4068
Waste Connections
WCN
$43.6B
| $120K | ﹤0.01% |
+1,598
| New | +$119K |
|
|
AJRD
4069
DELISTED
Aerojet Rocketdyne Holdings
AJRD
| $120K | ﹤0.01% |
4,091
-2,948
| -42% | -$85.1K |
|
|
BPT
4070
CALL
DELISTED
BP Prudhoe Bay Royalty Trust
BPT
| $119K | ﹤0.01% |
40
-36
| -47% | -$930 |
|
4071
CALL
Essex Property Trust
ESS
$19.1B
| $119K | ﹤0.01% |
+5
| New | +$1.19K |
|
4072
CALL
Flex
FLEX
$37.7B
| $119K | ﹤0.01% |
113
-14
| -11% | -$157 |
|
4073
PUT
Globant
GLOB
$1.65B
| $119K | ﹤0.01% |
+21
| New | +$1.05K |
|
|
LOMA
4074
Loma Negra
LOMA
$1.34B
| $119K | ﹤0.01% |
11,621
-34,308
| -75% | -$565K |
|
|
NOAH
4075
CALL
Noah Holdings
NOAH
$590M
| $119K | ﹤0.01% |
23
+16
| +229% | +$905 |
|
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.