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 | |
|---|---|---|---|---|---|---|
3051
PUT
Duluth Holdings
DLTH
$159M
| $1.04M | ﹤0.01% |
50,500
+49,428
| +4,611% | +$815K |
|
3052
PUT
AeroVironment
AVAV
$7.83B
| $1.04M | ﹤0.01% |
10,400
+10,366
| +30,488% | +$1.14M |
|
3053
PUT
BorgWarner
BWA
$12.9B
| $1.04M | ﹤0.01% |
24,375
+23,892
| +4,947% | +$1.05M |
|
3054
CALL
United States 12 Month Oil Fund,
USL
$44.7M
| $1.04M | ﹤0.01% |
40,700
+40,383
| +12,739% | +$941K |
|
3055
Vodafone
VOD
$36.4B
| $1.04M | ﹤0.01% |
+60,766
| New | +$1.14M |
|
3056
CALL
SSR Mining
SSRM
$5.47B
| $1.04M | ﹤0.01% |
66,600
+65,380
| +5,359% | +$1.1M |
|
|
SDC
3057
DELISTED
SmileDirectClub, Inc. Class A Common Stock
SDC
| $1.04M | ﹤0.01% |
119,604
+43,358
| +57% | +$400K |
|
|
WRK
3058
CALL
DELISTED
WestRock Company
WRK
| $1.04M | ﹤0.01% |
19,500
+18,519
| +1,888% | +$1.04M |
|
3059
Cisco
CSCO
$449B
| $1.04M | ﹤0.01% |
19,563
-81,819
| -81% | -$4.3M |
|
3060
Lincoln National
LNC
$7.85B
| $1.04M | ﹤0.01% |
16,489
-38,325
| -70% | -$2.53M |
|
|
ZGNX
3061
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $1.04M | ﹤0.01% |
60,000
+59,661
| +17,599% | +$1.1M |
|
3062
PUT
United States Copper Index Fund
CPER
$748M
| $1.03M | ﹤0.01% |
39,400
+39,399
| +3,939,900% | +$1.07M |
|
3063
Invesco WilderHill Clean Energy ETF
PBW
$402M
| $1.03M | ﹤0.01% |
11,095
-1,828
| -14% | -$158K |
|
3064
Helmerich & Payne
HP
$3.4B
| $1.03M | ﹤0.01% |
31,618
-18,657
| -37% | -$549K |
|
3065
CALL
Main Street Capital
MAIN
$5.02B
| $1.03M | ﹤0.01% |
25,100
+24,990
| +22,718% | +$1.04M |
|
3066
ScottsMiracle-Gro
SMG
$4.04B
| $1.03M | ﹤0.01% |
5,376
+4,394
| +447% | +$969K |
|
|
NNDM
3067
CALL
Nano Dimension
NNDM
$312M
| $1.03M | ﹤0.01% |
125,100
+124,031
| +11,603% | +$918K |
|
|
RDUS
3068
PUT
DELISTED
Radius Recycling
RDUS
| $1.03M | ﹤0.01% |
21,000
+20,972
| +74,900% | +$1.04M |
|
|
OSH
3069
PUT
DELISTED
Oak Street Health, Inc.
OSH
| $1.03M | ﹤0.01% |
17,600
+17,591
| +195,456% | +$1.05M |
|
3070
PUT
AerCap
AER
$23.8B
| $1.03M | ﹤0.01% |
+20,100
| New | +$1.16M |
|
3071
CALL
America Movil
AMX
$77.5B
| $1.03M | ﹤0.01% |
68,600
+68,531
| +99,320% | +$1.02M |
|
|
CUTR
3072
PUT
DELISTED
Cutera, Inc.
CUTR
| $1.03M | ﹤0.01% |
21,000
+20,982
| +116,567% | +$770K |
|
|
BHVN
3073
CALL
DELISTED
Biohaven Pharmaceutical Holding Company Ltd.
BHVN
| $1.03M | ﹤0.01% |
10,600
+10,556
| +23,991% | +$857K |
|
|
PACW
3074
CALL
DELISTED
PacWest Bancorp
PACW
| $1.03M | ﹤0.01% |
25,000
+24,684
| +7,811% | +$1.06M |
|
|
HOLX
3075
PUT
DELISTED
Hologic
HOLX
| $1.03M | ﹤0.01% |
15,400
+15,364
| +42,678% | +$1.03M |
|
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.