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 | |
|---|---|---|---|---|---|---|
5476
PUT
XWELL
XWEL
$8.53M
| $228K | ﹤0.01% |
7,425
+7,396
| +25,503% | +$211K |
|
|
ENG
5477
CALL
DELISTED
ENGlobal Corp
ENG
| $228K | ﹤0.01% |
9,413
+9,386
| +34,763% | +$236K |
|
|
IEA
5478
DELISTED
Infrastructure and Energy Alternatives, Inc. Common Stock
IEA
| $228K | ﹤0.01% |
17,772
+3,896
| +28% | +$48.8K |
|
5479
Alliant Energy
LNT
$18.2B
| $227K | ﹤0.01% |
4,076
+3,938
| +2,854% | +$223K |
|
5480
Pentair
PNR
$10.5B
| $227K | ﹤0.01% |
3,372
+869
| +35% | +$57.5K |
|
5481
CALL
Reynolds Consumer Products
REYN
$5.31B
| $227K | ﹤0.01% |
7,500
+7,354
| +5,037% | +$223K |
|
5482
CALL
Safety Insurance
SAFT
$1.52B
| $227K | ﹤0.01% |
+2,900
| New | +$242K |
|
5483
CALL
Scholastic
SCHL
$767M
| $227K | ﹤0.01% |
6,000
+5,862
| +4,248% | +$198K |
|
5484
Wipro
WIT
$19.7B
| $227K | ﹤0.01% |
+58,364
| New | +$218K |
|
|
ALLK
5485
DELISTED
Allakos
ALLK
| $226K | ﹤0.01% |
2,655
-2,060
| -44% | -$206K |
|
|
DMC
5486
CALL
Del Monte Corp
DMC
$1.41B
| $226K | ﹤0.01% |
6,900
+6,875
| +27,500% | +$222K |
|
5487
CALL
Graphic Packaging
GPK
$3.2B
| $226K | ﹤0.01% |
12,500
+12,480
| +62,400% | +$228K |
|
5488
Lincoln Educational Services
LINC
$1.34B
| $226K | ﹤0.01% |
+29,113
| New | +$208K |
|
5489
PTC
PTC
$15.9B
| $226K | ﹤0.01% |
+1,606
| New | +$220K |
|
5490
Vanguard FTSE Pacific ETF
VPL
$8.1B
| $226K | ﹤0.01% |
2,746
+700
| +34% | +$58.1K |
|
|
BEST
5491
CALL
DELISTED
BEST Inc. American Depositary Shares, each representing twenty (20) Class A Ordinary Shares
BEST
| $226K | ﹤0.01% |
6,360
+6,356
| +158,900% | +$182K |
|
|
CURO
5492
PUT
DELISTED
CURO Group Holdings Corp.
CURO
| $226K | ﹤0.01% |
13,300
+13,126
| +7,544% | +$204K |
|
|
ONCT
5493
DELISTED
Oncternal Therapeutics, Inc. Common Stock
ONCT
| $226K | ﹤0.01% |
2,384
+466
| +24% | +$55.3K |
|
|
SIOX
5494
PUT
DELISTED
Sio Gene Therapies Inc. Common Stock
SIOX
| $226K | ﹤0.01% |
82,900
+82,543
| +23,121% | +$205K |
|
|
SHLX
5495
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $226K | ﹤0.01% |
15,335
-13,238
| -46% | -$198K |
|
5496
CALL
Dover
DOV
$27.6B
| $225K | ﹤0.01% |
1,500
+1,457
| +3,388% | +$215K |
|
5497
CALL
EverQuote
EVER
$895M
| $225K | ﹤0.01% |
6,900
+6,586
| +2,097% | +$220K |
|
5498
CALL
Fidelity National Financial
FNF
$13.9B
| $225K | ﹤0.01% |
5,408
+4,977
| +1,155% | +$217K |
|
5499
CALL
Kimco Realty
KIM
$17.1B
| $225K | ﹤0.01% |
10,800
+10,627
| +6,143% | +$220K |
|
5500
PUT
Middleby
MIDD
$6.06B
| $225K | ﹤0.01% |
1,300
+1,261
| +3,233% | +$215K |
|
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.