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 | |
|---|---|---|---|---|---|---|
7576
Tejon Ranch
TRC
$460M
| $53K | ﹤0.01% |
+3,546
| New | +$55.1K |
|
7577
VEON
VEON
$3.5B
| $53K | ﹤0.01% |
+1,173
| New | +$51.8K |
|
7578
CALL
Werner Enterprises
WERN
$2.2B
| $53K | ﹤0.01% |
1,200
+1,196
| +29,900% | +$55.8K |
|
7579
Xeris Biopharma Holdings
XERS
$1.45B
| $53K | ﹤0.01% |
+13,229
| New | +$50.5K |
|
|
PHLT
7580
PUT
DELISTED
Performant Healthcare Inc
PHLT
| $53K | ﹤0.01% |
14,200
+14,081
| +11,833% | +$40.1K |
|
|
BCOV
7581
DELISTED
Brightcove, Inc.
BCOV
| $53K | ﹤0.01% |
3,755
-16,728
| -82% | -$269K |
|
|
VIA
7582
DELISTED
Via Renewables, Inc. Class A Common Stock
VIA
| $53K | ﹤0.01% |
945
+239
| +34% | +$12.8K |
|
|
SUNL
7583
PUT
DELISTED
Sunlight Financial Holdings, Inc.
SUNL
| $53K | ﹤0.01% |
1,905
+1,799
| +1,697% | +$360K |
|
|
SYKE
7584
PUT
DELISTED
SYKES Enterprises Inc
SYKE
| $53K | ﹤0.01% |
1,000
+990
| +9,900% | +$44K |
|
|
IO
7585
CALL
DELISTED
ION Geophysical Corporation
IO
| $53K | ﹤0.01% |
25,500
+21,305
| +508% | +$45.7K |
|
|
LUNA
7586
DELISTED
Luna Innovations Incorporated
LUNA
| $53K | ﹤0.01% |
4,896
+541
| +12% | +$5.89K |
|
7587
PUT
Abeona Therapeutics
ABEO
$355M
| $52K | ﹤0.01% |
+1,348
| New | +$55K |
|
7588
PUT
Aldeyra Therapeutics
ALDX
$97.1M
| $52K | ﹤0.01% |
4,600
+4,560
| +11,400% | +$54.8K |
|
7589
Booz Allen Hamilton
BAH
$8.44B
| $52K | ﹤0.01% |
611
-2,790
| -82% | -$236K |
|
7590
CALL
Cipher Digital
CIFR
$7.24B
| $52K | ﹤0.01% |
+5,300
| New | +$53.3K |
|
7591
CALL
Central Pacific Financial
CPF
$1.02B
| $52K | ﹤0.01% |
2,000
+1,985
| +13,233% | +$54.5K |
|
7592
Carriage Services
CSV
$647M
| $52K | ﹤0.01% |
1,421
+1,211
| +577% | +$45.2K |
|
7593
PUT
Enanta Pharmaceuticals
ENTA
$362M
| $52K | ﹤0.01% |
1,200
+1,190
| +11,900% | +$58.3K |
|
7594
Gilat Satellite Networks
GILT
$789M
| $52K | ﹤0.01% |
+5,112
| New | +$50.9K |
|
|
HI
7595
CALL
DELISTED
Hillenbrand
HI
| $52K | ﹤0.01% |
1,200
+1,146
| +2,122% | +$53.5K |
|
7596
PUT
Inogen
INGN
$174M
| $52K | ﹤0.01% |
800
+792
| +9,900% | +$50.1K |
|
7597
Lands' End
LE
$378M
| $52K | ﹤0.01% |
1,280
-5,665
| -82% | -$155K |
|
|
MREO
7598
Mereo BioPharma
MREO
$48.9M
| $52K | ﹤0.01% |
16,535
+9,156
| +124% | +$30.7K |
|
|
SIFY
7599
Sify Technologies
SIFY
$1.01B
| $52K | ﹤0.01% |
2,424
-8,368
| -78% | -$164K |
|
7600
PUT
Telephone and Data Systems
TDS
$3.87B
| $52K | ﹤0.01% |
2,300
+2,170
| +1,669% | +$52.9K |
|
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.