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 | |
|---|---|---|---|---|---|---|
5226
PUT
Urban Edge Properties
UE
$2.87B
| $259K | ﹤0.01% |
13,600
+13,497
| +13,104% | +$254K |
|
5227
CALL
Vishay Intertechnology
VSH
$5.18B
| $259K | ﹤0.01% |
11,500
+11,439
| +18,752% | +$274K |
|
|
CTEV
5228
PUT
Claritev Corp
CTEV
$402M
| $259K | ﹤0.01% |
683
+672
| +6,109% | +$208K |
|
|
ORTX
5229
DELISTED
Orchard Therapeutics plc American Depositary Shares
ORTX
| $259K | ﹤0.01% |
5,922
+4,376
| +283% | +$244K |
|
|
ZNTE
5230
DELISTED
Zanite Acquisition Corp. Class A Common Stock
ZNTE
| $259K | ﹤0.01% |
25,838
-105,866
| -80% | -$1.06M |
|
5231
CALL
Amcor
AMCR
$20.9B
| $258K | ﹤0.01% |
4,520
+4,499
| +21,424% | +$268K |
|
5232
CALL
Future Fuel
FF
$218M
| $258K | ﹤0.01% |
27,000
+26,845
| +17,319% | +$325K |
|
5233
PUT
Full House Resorts
FLL
$79.4M
| $258K | ﹤0.01% |
26,000
+25,990
| +259,900% | +$252K |
|
5234
W.W. Grainger
GWW
$64B
| $258K | ﹤0.01% |
590
+260
| +79% | +$115K |
|
5235
Hudbay
HBM
$10.1B
| $258K | ﹤0.01% |
38,836
+8,205
| +27% | +$61.3K |
|
5236
CALL
Madison Square Garden
MSGS
$9.75B
| $258K | ﹤0.01% |
1,500
+1,486
| +10,614% | +$269K |
|
|
PROF
5237
CALL
Profound Medical
PROF
$263M
| $258K | ﹤0.01% |
15,800
+15,749
| +30,880% | +$293K |
|
5238
PUT
Transmedics
TMDX
$2.63B
| $258K | ﹤0.01% |
7,800
+7,739
| +12,687% | +$214K |
|
5239
Metallus
MTUS
$826M
| $258K | ﹤0.01% |
18,289
+10,133
| +124% | +$137K |
|
|
OIG
5240
CALL
DELISTED
Orbital Infrastructure Group, Inc. Common Stock
OIG
| $258K | ﹤0.01% |
1,480
+1,460
| +7,300% | +$255K |
|
|
EQOS
5241
CALL
DELISTED
EQONEX LIMITED Ordinary Shares
EQOS
| $258K | ﹤0.01% |
39,400
+39,199
| +19,502% | +$272K |
|
|
AMRN
5242
Amarin Corp
AMRN
$298M
| $257K | ﹤0.01% |
2,941
-7,914
| -73% | -$777K |
|
5243
CALL
Churchill Downs
CHDN
$5.76B
| $257K | ﹤0.01% |
+2,600
| New | +$267K |
|
5244
PUT
Chefs' Warehouse
CHEF
$4.58B
| $257K | ﹤0.01% |
8,100
+8,029
| +11,308% | +$257K |
|
5245
PUT
Concentrix
CNXC
$1.52B
| $257K | ﹤0.01% |
1,600
+1,599
| +159,900% | +$246K |
|
|
IGMS
5246
CALL
DELISTED
IGM Biosciences
IGMS
| $257K | ﹤0.01% |
3,100
+3,099
| +309,900% | +$230K |
|
5247
PUT
NewMarket
NEU
$7.97B
| $257K | ﹤0.01% |
+800
| New | +$280K |
|
5248
CALL
NiSource
NI
$21.6B
| $257K | ﹤0.01% |
10,500
+10,439
| +17,113% | +$265K |
|
5249
Recursion Pharmaceuticals
RXRX
$1.61B
| $257K | ﹤0.01% |
+7,066
| New | +$209K |
|
5250
Spotify
SPOT
$107B
| $257K | ﹤0.01% |
936
-10,910
| -92% | -$2.77M |
|
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.