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 | |
|---|---|---|---|---|---|---|
|
DMTK
3076
PUT
DELISTED
DermTech, Inc. Common Stock
DMTK
| $1.03M | ﹤0.01% |
24,700
+24,539
| +15,242% | +$1.01M |
|
|
BBL
3077
CALL
DELISTED
BHP Group Plc American Depositary Shares (Each representing two Ordinary Shares)
BBL
| $1.03M | ﹤0.01% |
17,200
+17,109
| +18,801% | +$1.05M |
|
3078
PUT
Cerence
CRNC
$375M
| $1.02M | ﹤0.01% |
9,600
+9,522
| +12,208% | +$937K |
|
3079
PUT
VeriSign
VRSN
$24.9B
| $1.02M | ﹤0.01% |
4,500
+4,422
| +5,669% | +$963K |
|
3080
PUT
Whirlpool
WHR
$2.47B
| $1.02M | ﹤0.01% |
4,700
+4,624
| +6,084% | +$1.08M |
|
|
BZUN
3081
Baozun
BZUN
$163M
| $1.02M | ﹤0.01% |
28,874
+2,052
| +8% | +$72.3K |
|
3082
CALL
NatWest
NWG
$72B
| $1.02M | ﹤0.01% |
168,536
+167,029
| +11,084% | +$1.01M |
|
3083
CALL
Tradeweb Markets
TW
$21.8B
| $1.02M | ﹤0.01% |
12,100
+11,974
| +9,503% | +$977K |
|
3084
CryoPort
CYRX
$755M
| $1.02M | ﹤0.01% |
16,202
+3,824
| +31% | +$215K |
|
3085
PUT
Universal Display
OLED
$3.78B
| $1.02M | ﹤0.01% |
4,600
+4,530
| +6,471% | +$992K |
|
3086
Sturm, Ruger & Co
RGR
$616M
| $1.02M | ﹤0.01% |
11,352
+6,020
| +113% | +$451K |
|
|
SKX
3087
PUT
DELISTED
Skechers
SKX
| $1.02M | ﹤0.01% |
20,500
+20,240
| +7,785% | +$954K |
|
|
KSU
3088
CALL
DELISTED
Kansas City Southern
KSU
| $1.02M | ﹤0.01% |
+3,600
| New | +$1.04M |
|
3089
iShares MSCI South Korea ETF
EWY
$22B
| $1.02M | ﹤0.01% |
10,946
-28,054
| -72% | -$2.58M |
|
3090
CALL
Xylem
XYL
$28.6B
| $1.02M | ﹤0.01% |
8,500
+8,321
| +4,649% | +$950K |
|
|
FBC
3091
CALL
DELISTED
Flagstar Bancorp, Inc. New
FBC
| $1.02M | ﹤0.01% |
24,100
+23,711
| +6,095% | +$1.07M |
|
|
HBI
3092
PUT
DELISTED
Hanesbrands
HBI
| $1.02M | ﹤0.01% |
54,500
+53,337
| +4,586% | +$1.06M |
|
3093
CALL
Gartner
IT
$10.1B
| $1.02M | ﹤0.01% |
4,200
+4,108
| +4,465% | +$899K |
|
|
UPH
3094
CALL
DELISTED
UpHealth, Inc.
UPH
| $1.01M | ﹤0.01% |
15,070
+14,708
| +4,063% | +$1.38M |
|
|
TGP
3095
CALL
DELISTED
Teekay LNG Partners L.P.
TGP
| $1.01M | ﹤0.01% |
67,300
+67,096
| +32,890% | +$1.02M |
|
3096
CALL
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $1.01M | ﹤0.01% |
41,600
+41,304
| +13,954% | +$2.43M |
|
3097
PUT
Howard Hughes
HHH
$3.95B
| $1.01M | ﹤0.01% |
10,910
+10,615
| +3,598% | +$1.05M |
|
|
SJR
3098
DELISTED
Shaw Communications Inc.
SJR
| $1.01M | ﹤0.01% |
35,054
+31,937
| +1,025% | +$921K |
|
|
TBIO
3099
CALL
DELISTED
Translate Bio, Inc. Common Stock
TBIO
| $1.01M | ﹤0.01% |
36,800
+36,607
| +18,967% | +$719K |
|
3100
PUT
Eterna Therapeutics
ERNA
$4.57M
| $1.01M | ﹤0.01% |
+7
| New | +$1.01M |
|
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.