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 | |
|---|---|---|---|---|---|---|
801
PUT
Paycom
PAYC
$6.47B
| $8.43M | 0.01% |
23,200
+23,103
| +23,818% | +$8.19M |
|
802
CALL
SolarEdge
SEDG
$2.75B
| $8.43M | 0.01% |
+30,500
| New | +$7.68M |
|
803
PUT
Cigna
CI
$75.7B
| $8.39M | 0.01% |
35,400
+35,127
| +12,867% | +$8.77M |
|
804
CALL
ON Semiconductor
ON
$35.1B
| $8.38M | 0.01% |
+219,000
| New | +$8.6M |
|
|
IPFF
805
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $8.38M | 0.01% |
128,700
+127,417
| +9,931% | +$2.2M |
|
806
CALL
American Water Works
AWK
$26.2B
| $8.34M | 0.01% |
54,100
+53,334
| +6,963% | +$8.31M |
|
|
IPOF
807
PUT
DELISTED
Social Capital Hedosophia Holdings Corp. VI
IPOF
| $8.32M | 0.01% |
816,100
+809,947
| +13,163% | +$8.35M |
|
808
CALL
First Majestic Silver
AG
$8.12B
| $8.31M | 0.01% |
525,600
+522,595
| +17,391% | +$8.71M |
|
809
PUT
Radware
RDWR
$1.22B
| $8.3M | 0.01% |
269,800
+269,267
| +50,519% | +$7.76M |
|
810
iShares US Real Estate ETF
IYR
$4.49B
| $8.29M | 0.01% |
81,307
+69,636
| +597% | +$6.91M |
|
811
PUT
TransDigm Group
TDG
$67.9B
| $8.29M | 0.01% |
12,800
+12,678
| +10,392% | +$7.95M |
|
812
PUT
Otis Worldwide
OTIS
$27.2B
| $8.28M | 0.01% |
101,300
+101,191
| +92,836% | +$7.79M |
|
|
UCD
813
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $8.27M | 0.01% |
153,200
+144,379
| +1,637% | +$7.79M |
|
|
FIRY
814
CALL
Firy Inc
FIRY
$126M
| $8.27M | 0.01% |
19,030
+18,933
| +19,519% | +$6.76M |
|
815
CALL
Fiverr
FVRR
$370M
| $8.24M | 0.01% |
34,000
+33,309
| +4,820% | +$6.91M |
|
|
ATVI
816
DELISTED
Activision Blizzard
ATVI
| $8.24M | 0.01% |
86,371
+63,003
| +270% | +$5.97M |
|
817
PUT
Estee Lauder
EL
$28.9B
| $8.24M | 0.01% |
25,900
+25,739
| +15,987% | +$7.8M |
|
818
CALL
Air Products & Chemicals
APD
$65.5B
| $8.23M | 0.01% |
28,600
+28,385
| +13,202% | +$8.33M |
|
819
PUT
Cadence Design Systems
CDNS
$91.1B
| $8.22M | 0.01% |
60,100
+59,268
| +7,124% | +$7.85M |
|
|
DFS
820
CALL
DELISTED
Discover Financial Services
DFS
| $8.22M | 0.01% |
69,500
+68,406
| +6,253% | +$7.73M |
|
821
CALL
Paychex
PAYX
$39.4B
| $8.22M | 0.01% |
76,600
+75,930
| +11,333% | +$7.64M |
|
822
PUT
Cognex
CGNX
$10.6B
| $8.2M | 0.01% |
97,600
+97,269
| +29,386% | +$7.87M |
|
823
CALL
Antero Resources
AR
$10.9B
| $8.2M | 0.01% |
545,400
+541,647
| +14,432% | +$6.36M |
|
|
GAP
824
CALL
The Gap Inc
GAP
$6.8B
| $8.19M | 0.01% |
243,400
+239,439
| +6,045% | +$7.9M |
|
825
PUT
Canadian National Railway
CNI
$79.2B
| $8.19M | 0.01% |
77,600
+77,555
| +172,344% | +$8.56M |
|
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.