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 | |
|---|---|---|---|---|---|---|
3951
CALL
Citi Trends
CTRN
$559M
| $565K | ﹤0.01% |
6,500
+6,498
| +324,900% | +$598K |
|
|
NOVA
3952
CALL
DELISTED
Sunnova Energy
NOVA
| $564K | ﹤0.01% |
15,000
+14,590
| +3,559% | +$485K |
|
3953
Synaptics
SYNA
$4.33B
| $564K | ﹤0.01% |
+3,629
| New | +$491K |
|
3954
PUT
Energous
WATT
$72.8M
| $564K | ﹤0.01% |
328
+325
| +10,833% | +$590K |
|
3955
CALL
ALX Oncology
ALXO
$268M
| $563K | ﹤0.01% |
10,300
+10,254
| +22,291% | +$614K |
|
3956
PUT
Protalix BioTherapeutics
PLX
$188M
| $563K | ﹤0.01% |
295,000
+294,657
| +85,906% | +$1.01M |
|
3957
PUT
Ziff Davis
ZD
$1.95B
| $563K | ﹤0.01% |
4,715
+4,254
| +923% | +$467K |
|
|
ZYXI
3958
PUT
DELISTED
Zynex
ZYXI
| $563K | ﹤0.01% |
39,930
+39,719
| +18,824% | +$549K |
|
|
XLNX
3959
DELISTED
Xilinx Inc
XLNX
| $563K | ﹤0.01% |
3,894
-20,043
| -84% | -$2.55M |
|
3960
Xenon Pharmaceuticals
XENE
$6.28B
| $562K | ﹤0.01% |
30,207
+10,065
| +50% | +$186K |
|
|
EGIO
3961
PUT
DELISTED
Edgio, Inc. Common Stock
EGIO
| $562K | ﹤0.01% |
4,465
+4,387
| +5,624% | +$579K |
|
|
VNE
3962
CALL
DELISTED
Veoneer, Inc.
VNE
| $562K | ﹤0.01% |
24,400
+24,333
| +36,318% | +$578K |
|
3963
CALL
Banc of California
BANC
$3.27B
| $561K | ﹤0.01% |
32,000
+31,659
| +9,284% | +$565K |
|
3964
eHealth
EHTH
$43.2M
| $560K | ﹤0.01% |
9,602
-11,273
| -54% | -$741K |
|
3965
CALL
Playtika
PLTK
$1.51B
| $560K | ﹤0.01% |
23,500
+23,279
| +10,533% | +$609K |
|
3966
Vanguard Mid-Cap Growth ETF
VOT
$19.1B
| $560K | ﹤0.01% |
2,370
+2,327
| +5,412% | +$522K |
|
|
CARM
3967
CALL
DELISTED
Carisma Therapeutics
CARM
| $559K | ﹤0.01% |
6,055
+5,988
| +8,937% | +$382K |
|
|
SOS
3968
PUT
SOS Limited
SOS
$17.8M
| $559K | ﹤0.01% |
225
+221
| +5,525% | +$648K |
|
3969
PUT
Viper Energy
VNOM
$8.21B
| $559K | ﹤0.01% |
29,700
+29,273
| +6,856% | +$525K |
|
|
CADE
3970
CALL
DELISTED
Cadence Bancorporation
CADE
| $559K | ﹤0.01% |
26,800
+26,210
| +4,442% | +$574K |
|
3971
PUT
Children's Place
PLCE
$55.8M
| $558K | ﹤0.01% |
6,000
+5,921
| +7,495% | +$503K |
|
|
IS
3972
CALL
DELISTED
ironSource Ltd.
IS
| $558K | ﹤0.01% |
+53,200
| New | +$572K |
|
|
ADVM
3973
PUT
DELISTED
Adverum Biotechnologies
ADVM
| $557K | ﹤0.01% |
15,930
+15,769
| +9,794% | +$849K |
|
3974
Direxion Daily Junior Gold Miners Index Bull 2X ETF
JNUG
$361M
| $557K | ﹤0.01% |
+6,836
| New | +$663K |
|
3975
PUT
Signet Jewelers
SIG
$3.81B
| $557K | ﹤0.01% |
6,900
+6,828
| +9,483% | +$442K |
|
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.