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 | |
|---|---|---|---|---|---|---|
726
PUT
C3.ai
AI
$1.27B
| $9.77M | 0.01% |
156,200
+155,239
| +16,154% | +$9.65M |
|
727
Verizon
VZ
$183B
| $9.77M | 0.01% |
+174,313
| New | +$10M |
|
728
CALL
Digital Turbine
APPS
$971M
| $9.75M | 0.01% |
+128,200
| New | +$9.15M |
|
729
PUT
Sunrun
RUN
$2.48B
| $9.74M | 0.01% |
174,570
+172,993
| +10,970% | +$8.35M |
|
730
CALL
MetLife
MET
$59.5B
| $9.72M | 0.01% |
162,400
+160,095
| +6,946% | +$10.1M |
|
731
PUT
Polaris
PII
$4.13B
| $9.71M | 0.01% |
70,900
+70,647
| +27,924% | +$9.58M |
|
732
PUT
Centene
CNC
$31.5B
| $9.69M | 0.01% |
132,900
+131,902
| +13,217% | +$9.04M |
|
733
CALL
Intellia Therapeutics
NTLA
$1.55B
| $9.65M | 0.01% |
59,600
+59,381
| +27,115% | +$4.62M |
|
734
CALL
American Tower
AMT
$76.7B
| $9.64M | 0.01% |
35,700
+34,424
| +2,698% | +$8.77M |
|
735
CALL
Labcorp
LH
$23.9B
| $9.63M | 0.01% |
40,624
+40,407
| +18,621% | +$9.21M |
|
736
CALL
CME Group
CME
$91.9B
| $9.59M | 0.01% |
45,100
+44,669
| +10,364% | +$9.43M |
|
737
CALL
Atlassian
TEAM
$20.3B
| $9.58M | 0.01% |
+37,300
| New | +$8.73M |
|
|
XLNX
738
PUT
DELISTED
Xilinx Inc
XLNX
| $9.57M | 0.01% |
+66,200
| New | +$8.41M |
|
739
PUT
Lumentum
LITE
$64.9B
| $9.56M | 0.01% |
116,500
+115,294
| +9,560% | +$9.69M |
|
740
CALL
ProShares Ultra S&P500
SSO
$7.82B
| $9.55M | 0.01% |
474,400
+471,948
| +19,247% | +$13.4M |
|
741
CALL
Franco-Nevada
FNV
$41.3B
| $9.54M | 0.01% |
+65,800
| New | +$9.52M |
|
742
CALL
General Dynamics
GD
$103B
| $9.54M | 0.01% |
50,700
+50,186
| +9,764% | +$9.46M |
|
743
CALL
Cracker Barrel
CBRL
$1.16B
| $9.53M | 0.01% |
64,200
+63,522
| +9,369% | +$10.2M |
|
744
Amazon
AMZN
$2.51T
| $9.5M | 0.01% |
55,220
-26,780
| -33% | -$4.45M |
|
745
PUT
Stem
STEM
$52M
| $9.47M | 0.01% |
13,150
+13,108
| +31,210% | +$7.13M |
|
746
CALL
Hershey
HSY
$34.9B
| $9.46M | 0.01% |
54,300
+54,186
| +47,532% | +$9.13M |
|
747
CALL
Avis
CAR
$5.62B
| $9.41M | 0.01% |
+120,800
| New | +$10M |
|
748
CALL
Teradyne
TER
$58.5B
| $9.38M | 0.01% |
70,000
+69,631
| +18,870% | +$8.91M |
|
|
FLNA
749
CALL
Filana Therapeutics
FLNA
$45M
| $9.37M | 0.01% |
109,700
+109,060
| +17,041% | +$5.84M |
|
750
Generac Holdings
GNRC
$12.4B
| $9.37M | 0.01% |
22,571
+21,711
| +2,525% | +$7.28M |
|
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.