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 | |
|---|---|---|---|---|---|---|
|
FABC
6301
CALL
Fabric.AI Inc
FABC
$16.6M
| $134K | ﹤0.01% |
216
+210
| +3,500% | +$138K |
|
|
BRFS
6302
CALL
DELISTED
BRF SA
BRFS
| $134K | ﹤0.01% |
+24,600
| New | +$117K |
|
|
DOO
6303
Bombardier Recreational Products
DOO
$4.54B
| $134K | ﹤0.01% |
+1,711
| New | +$145K |
|
6304
CALL
Quanex
NX
$819M
| $134K | ﹤0.01% |
5,400
+5,399
| +539,900% | +$144K |
|
|
ODP
6305
PUT
DELISTED
ODP
ODP
| $134K | ﹤0.01% |
2,800
+2,749
| +5,390% | +$121K |
|
|
BCEL
6306
DELISTED
Atreca, Inc. Class A Common Stock
BCEL
| $134K | ﹤0.01% |
+15,758
| New | +$161K |
|
|
SYNH
6307
CALL
DELISTED
Syneos Health, Inc. Class A Common Stock
SYNH
| $134K | ﹤0.01% |
1,500
+1,425
| +1,900% | +$120K |
|
|
LFLY
6308
PUT
DELISTED
Leafly Holdings, Inc. Common Stock
LFLY
| $134K | ﹤0.01% |
675
+650
| +2,600% | +$130K |
|
|
JOBS
6309
DELISTED
51job Inc
JOBS
| $134K | ﹤0.01% |
+1,727
| New | +$121K |
|
6310
CALL
Axcelis
ACLS
$4.01B
| $133K | ﹤0.01% |
3,300
+3,240
| +5,400% | +$134K |
|
6311
CALL
Benchmark Electronics
BHE
$2.87B
| $133K | ﹤0.01% |
4,700
+4,695
| +93,900% | +$142K |
|
6312
PUT
Innodata
INOD
$2.05B
| $133K | ﹤0.01% |
19,100
+18,801
| +6,288% | +$127K |
|
6313
CALL
NN Inc
NNBR
$255M
| $133K | ﹤0.01% |
+18,200
| New | +$137K |
|
6314
CALL
PDS Biotechnology
PDSB
$38.4M
| $133K | ﹤0.01% |
+10,600
| New | +$82.8K |
|
6315
PUT
Surgery Partners
SGRY
$2.01B
| $133K | ﹤0.01% |
2,000
+1,993
| +28,471% | +$108K |
|
|
SVC
6316
PUT
Service Properties Trust
SVC
$1.04B
| $133K | ﹤0.01% |
+2,120
| New | +$131K |
|
6317
Universal Corp
UVV
$1.31B
| $133K | ﹤0.01% |
2,342
+1,689
| +259% | +$97.5K |
|
|
VIVO
6318
CALL
VivoPower PLC
VIVO
$110M
| $133K | ﹤0.01% |
1,830
+1,820
| +18,200% | +$141K |
|
6319
CALL
AudioCodes
AUDC
$244M
| $132K | ﹤0.01% |
4,000
+3,381
| +546% | +$108K |
|
6320
Casey's General Stores
CASY
$32.2B
| $132K | ﹤0.01% |
679
+145
| +27% | +$31.2K |
|
6321
Designer Brands
DBI
$307M
| $132K | ﹤0.01% |
8,030
+4,967
| +162% | +$87.5K |
|
|
FRSX
6322
PUT
Foresight Autonomous Holdings
FRSX
$3.9M
| $132K | ﹤0.01% |
248
+245
| +8,167% | +$140K |
|
6323
Corning
GLW
$119B
| $132K | ﹤0.01% |
3,243
-4,157
| -56% | -$181K |
|
6324
Warrior Met Coal
HCC
$4.19B
| $132K | ﹤0.01% |
7,712
-27,543
| -78% | -$480K |
|
6325
CALL
NewtekOne
NEWT
$428M
| $132K | ﹤0.01% |
3,800
+3,720
| +4,650% | +$117K |
|
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.