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 |
AMC Entertainment Holdings
AMC
|
+$39.3M |
| 2 |
AT&T
T
|
+$29.8M |
| 3 |
NVIDIA
NVDA
|
+$28.3M |
| 4 |
Micron Technology
MU
|
+$22.9M |
| 5 |
Baidu
BIDU
|
+$22.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$36.1M |
| 2 |
Tesla
TSLA
|
+$35.2M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$25.9M |
| 4 |
Palantir
PLTR
|
+$25.7M |
| 5 |
Wells Fargo
WFC
|
+$20.4M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.47% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.26% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
MGP
6051
DELISTED
MGM Growth Properties LLC Class A common shares representing limited liability company interests
MGP
| $160K | ﹤0.01% |
4,385
+305
| +7% | +$10.9K |
|
6052
CALL
CalciMedica
CALC
$15.8M
| $159K | ﹤0.01% |
+2,093
| New | +$137K |
|
|
HEES
6053
CALL
DELISTED
H&E Equipment Services
HEES
| $159K | ﹤0.01% |
4,800
+4,728
| +6,567% | +$173K |
|
6054
CALL
Natural Resource Partners
NRP
$1.3B
| $159K | ﹤0.01% |
7,500
+7,496
| +187,400% | +$140K |
|
|
THS
6055
DELISTED
Treehouse Foods
THS
| $159K | ﹤0.01% |
+3,581
| New | +$177K |
|
|
TPC
6056
PUT
Tutor Perini Cor
TPC
$4.41B
| $159K | ﹤0.01% |
11,500
+11,332
| +6,745% | +$181K |
|
|
VRTV
6057
PUT
DELISTED
VERITIV CORPORATION
VRTV
| $159K | ﹤0.01% |
2,600
+2,595
| +51,900% | +$136K |
|
6058
Encompass Health
EHC
$11B
| $158K | ﹤0.01% |
+2,545
| New | +$170K |
|
|
ESPR
6059
PUT
DELISTED
Esperion Therapeutics
ESPR
| $158K | ﹤0.01% |
7,500
+6,830
| +1,019% | +$164K |
|
6060
Janus International
JBI
$700M
| $158K | ﹤0.01% |
+11,218
| New | +$155K |
|
6061
PUT
Opko Health
OPK
$985M
| $158K | ﹤0.01% |
+39,200
| New | +$154K |
|
6062
State Street SPDR S&P 600 Small Cap Value ETF
SLYV
$4.89B
| $158K | ﹤0.01% |
1,846
+140
| +8% | +$11.9K |
|
6063
CALL
Emergent Biosolutions
EBS
$373M
| $157K | ﹤0.01% |
2,500
+2,349
| +1,556% | +$151K |
|
|
GP
6064
PUT
GreenPower Motor Co
GP
$10.5M
| $157K | ﹤0.01% |
800
+792
| +9,900% | +$143K |
|
6065
PUT
NETGEAR
NTGR
$648M
| $157K | ﹤0.01% |
4,100
+3,999
| +3,959% | +$155K |
|
6066
CALL
Oceaneering
OII
$4.86B
| $157K | ﹤0.01% |
10,100
+9,998
| +9,802% | +$139K |
|
6067
Champion Homes
SKY
$4.37B
| $157K | ﹤0.01% |
2,950
+2,319
| +368% | +$109K |
|
6068
Snowflake
SNOW
$102B
| $157K | ﹤0.01% |
650
-1,053
| -62% | -$245K |
|
6069
PUT
Visteon
VC
$2.79B
| $157K | ﹤0.01% |
+1,300
| New | +$156K |
|
6070
Wrap Technologies
WRAP
$103M
| $157K | ﹤0.01% |
20,090
+16,180
| +414% | +$111K |
|
|
ZEV
6071
PUT
DELISTED
Lightning eMotors, Inc.
ZEV
| $157K | ﹤0.01% |
950
+905
| +2,011% | +$154K |
|
|
QIWI
6072
CALL
DELISTED
QIWI PLC
QIWI
| $157K | ﹤0.01% |
14,800
+13,832
| +1,429% | +$149K |
|
6073
CALL
Autoliv
ALV
$9.02B
| $156K | ﹤0.01% |
1,600
+1,595
| +31,900% | +$161K |
|
6074
CALL
CEVA Inc
CEVA
$910M
| $156K | ﹤0.01% |
3,300
+3,202
| +3,267% | +$158K |
|
6075
CALL
Caesarstone
CSTE
$72.3M
| $156K | ﹤0.01% |
10,600
+10,443
| +6,652% | +$158K |
|
Similar funds
Simplex Trading's Q2 2021 Portfolio in Review
As of Q2 2021, Simplex Trading held 11,184 positions worth $104B, up 86% from $55.7B the previous quarter. Its ten largest holdings account for 40% of the portfolio.
Simplex Trading deployed $97.5B of net new capital in Q2 2021, opening 2,250 new positions and adding to 6,673 existing holdings. Its largest new stake was AT&T: 1,311,180 shares worth $28.5M.
By sector, the portfolio is most concentrated in Technology at 0.47% of assets, down from 0.65% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, an estimated $25.9M trimmed.
- Simplex Trading's largest Q2 2021 buy was AT&T: 1,311,180 shares worth $28.5M.
- Simplex Trading added most to AMC Entertainment Holdings in Q2 2021, an estimated $39.3M increase.
- Simplex Trading's biggest Q2 2021 reduction was State Street SPDR Dow Jones Industrial Average ETF Trust, cutting an estimated $25.9M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2021, selling an estimated $36.1M.
- Simplex Trading's ten largest holdings make up 40% of its $104B portfolio in Q2 2021.
- Simplex Trading opened 2,250 new positions and closed 1,197 in Q2 2021.
- Simplex Trading's portfolio value rose 86% quarter-over-quarter to $104B.
Based on Simplex Trading's 13F filing for Q2 2021, filed 12 Aug 2021.