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 | |
|---|---|---|---|---|---|---|
|
CNR
2776
PUT
Core Natural Resources Inc
CNR
$4.19B
| $1.28M | ﹤0.01% |
69,300
+69,047
| +27,291% | +$928K |
|
2777
PUT
Gold Fields
GFI
$29.2B
| $1.27M | ﹤0.01% |
143,300
+141,398
| +7,434% | +$1.46M |
|
|
BTNB
2778
CALL
DELISTED
Bridgetown 2 Holdings Limited Class A Ordinary Shares
BTNB
| $1.27M | ﹤0.01% |
125,000
+124,874
| +99,106% | +$1.27M |
|
|
MXIM
2779
PUT
DELISTED
Maxim Integrated Products
MXIM
| $1.27M | ﹤0.01% |
+12,100
| New | +$1.18M |
|
2780
ProShares Ultra Bloomberg Natural Gas
BOIL
$417M
| $1.27M | ﹤0.01% |
+171
| New | +$868K |
|
|
IMGN
2781
CALL
DELISTED
Immunogen Inc
IMGN
| $1.27M | ﹤0.01% |
193,000
+191,667
| +14,379% | +$1.34M |
|
2782
H&R Block
HRB
$5.18B
| $1.27M | ﹤0.01% |
+54,056
| New | +$1.28M |
|
2783
PUT
Monolithic Power Systems
MPWR
$65.5B
| $1.27M | ﹤0.01% |
3,400
+3,359
| +8,193% | +$1.18M |
|
2784
PUT
Pentair
PNR
$10.2B
| $1.27M | ﹤0.01% |
18,800
+18,573
| +8,182% | +$1.23M |
|
2785
Southern Copper
SCCO
$141B
| $1.27M | ﹤0.01% |
21,279
+5,233
| +33% | +$340K |
|
|
SPNS
2786
PUT
DELISTED
Sapiens International
SPNS
| $1.27M | ﹤0.01% |
48,300
+47,883
| +11,483% | +$1.41M |
|
|
LAC
2787
DELISTED
Lithium Americas Corp. Common Shares
LAC
| $1.27M | ﹤0.01% |
85,468
-49,783
| -37% | -$711K |
|
2788
PUT
Kodak
KODK
$806M
| $1.27M | ﹤0.01% |
+152,400
| New | +$1.2M |
|
2789
Amplify Cybersecurity ETF
HACK
$2.63B
| $1.26M | ﹤0.01% |
20,859
+18,001
| +630% | +$1.05M |
|
|
P
2790
PUT
Everpure Inc
P
$24.8B
| $1.26M | ﹤0.01% |
64,700
+64,277
| +15,196% | +$1.26M |
|
2791
Horizon Kinetics Inflation Beneficiaries ETF
INFL
$1.5B
| $1.26M | ﹤0.01% |
+42,013
| New | +$1.24M |
|
2792
Sony
SONY
$123B
| $1.26M | ﹤0.01% |
64,760
-40,760
| -39% | -$826K |
|
2793
CALL
Quantum-Si Incorporated
QSI
$168M
| $1.25M | ﹤0.01% |
102,300
+101,977
| +31,572% | +$1.07M |
|
2794
PUT
Exelon
EXC
$48.6B
| $1.25M | ﹤0.01% |
39,677
+39,057
| +6,300% | +$1.26M |
|
2795
Acadia Pharmaceuticals
ACAD
$4.25B
| $1.25M | ﹤0.01% |
51,152
-39,705
| -44% | -$896K |
|
2796
Nokia
NOK
$50.8B
| $1.25M | ﹤0.01% |
234,545
-1,109,224
| -83% | -$5.35M |
|
|
SGEN
2797
PUT
DELISTED
Seagen Inc. Common Stock
SGEN
| $1.25M | ﹤0.01% |
7,900
+7,747
| +5,063% | +$1.15M |
|
|
QNGY
2798
CALL
DELISTED
Quanergy Systems, Inc.
QNGY
| $1.25M | ﹤0.01% |
6,295
+6,072
| +2,723% | +$1.21M |
|
2799
Global X Social Media ETF
SOCL
$87.8M
| $1.25M | ﹤0.01% |
17,226
+15,336
| +811% | +$1.04M |
|
2800
CALL
Tenet Healthcare
THC
$20.1B
| $1.25M | ﹤0.01% |
+18,600
| New | +$1.15M |
|
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.