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 | |
|---|---|---|---|---|---|---|
|
JOBS
6626
CALL
DELISTED
51job Inc
JOBS
| $108K | ﹤0.01% |
1,400
+1,397
| +46,567% | +$97.5K |
|
|
LORL
6627
CALL
DELISTED
Loral Space and Communications, Inc.
LORL
| $108K | ﹤0.01% |
2,800
+2,754
| +5,987% | +$105K |
|
6628
PUT
ACI Worldwide
ACIW
$5.83B
| $107K | ﹤0.01% |
2,900
+2,824
| +3,716% | +$110K |
|
|
STEX
6629
PUT
Streamex Corp
STEX
$74M
| $107K | ﹤0.01% |
2,780
+2,747
| +8,324% | +$103K |
|
6630
CALL
Casella Waste Systems
CWST
$5.71B
| $107K | ﹤0.01% |
1,700
+1,666
| +4,900% | +$111K |
|
6631
Extra Space Storage
EXR
$31.3B
| $107K | ﹤0.01% |
+659
| New | +$98.7K |
|
6632
PUT
KORU Medical Systems
KRMD
$189M
| $107K | ﹤0.01% |
23,200
+23,176
| +96,567% | +$91K |
|
6633
PUT
Kontoor Brands
KTB
$4.63B
| $107K | ﹤0.01% |
1,900
+1,851
| +3,778% | +$114K |
|
6634
PUT
Sprout Social
SPT
$516M
| $107K | ﹤0.01% |
1,200
+1,152
| +2,400% | +$79.9K |
|
|
ENZ
6635
CALL
DELISTED
Enzo Biochem, Inc.
ENZ
| $107K | ﹤0.01% |
33,800
+33,481
| +10,496% | +$105K |
|
|
SRC
6636
DELISTED
SPIRIT REALTY CAPITAL, INC.
SRC
| $107K | ﹤0.01% |
+2,245
| New | +$105K |
|
6637
BHP
BHP
$215B
| $106K | ﹤0.01% |
1,632
-29,063
| -95% | -$1.92M |
|
|
CLDT
6638
PUT
Chatham Lodging
CLDT
$622M
| $106K | ﹤0.01% |
8,300
+8,249
| +16,175% | +$110K |
|
|
CMCM
6639
Cheetah Mobile
CMCM
$86.6M
| $106K | ﹤0.01% |
8,982
-4,396
| -33% | -$49.4K |
|
6640
PUT
Lipocine
LPCN
$17.5M
| $106K | ﹤0.01% |
4,459
+4,435
| +18,479% | +$104K |
|
|
NSA
6641
CALL
DELISTED
National Storage Affiliates Trust
NSA
| $106K | ﹤0.01% |
2,100
+1,990
| +1,809% | +$91.1K |
|
6642
OppFi
OPFI
$800M
| $106K | ﹤0.01% |
10,428
+10,299
| +7,984% | +$105K |
|
6643
Sinclair Inc
SBGI
$992M
| $106K | ﹤0.01% |
3,194
+1,032
| +48% | +$33.4K |
|
6644
CALL
Surgery Partners
SGRY
$2.01B
| $106K | ﹤0.01% |
1,600
+1,585
| +10,567% | +$86.1K |
|
6645
CALL
Wipro
WIT
$19.6B
| $106K | ﹤0.01% |
27,200
+26,682
| +5,151% | +$99.6K |
|
|
GENE
6646
DELISTED
Genetic Technologies Ltd.
GENE
| $106K | ﹤0.01% |
5,032
-354
| -7% | -$7.14K |
|
|
BCEL
6647
PUT
DELISTED
Atreca, Inc. Class A Common Stock
BCEL
| $106K | ﹤0.01% |
12,500
+12,497
| +416,567% | +$128K |
|
|
ECOM
6648
DELISTED
CHANNELADVISOR CORPORATION
ECOM
| $106K | ﹤0.01% |
+4,344
| New | +$104K |
|
|
CAI
6649
CALL
DELISTED
CAI International, Inc.
CAI
| $106K | ﹤0.01% |
1,900
+1,869
| +6,029% | +$83K |
|
|
ENV
6650
CALL
DELISTED
ENVESTNET, INC.
ENV
| $106K | ﹤0.01% |
1,400
+1,352
| +2,817% | +$99.4K |
|
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.