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
4476
CALL
Core Natural Resources Inc
CNR
$3.93B
| $406K | ﹤0.01% |
22,000
+21,943
| +38,496% | +$295K |
|
4477
Invesco DB Oil Fund
DBO
$401M
| $405K | ﹤0.01% |
31,469
+14,200
| +82% | +$167K |
|
4478
Ebang International Holdings
EBON
$12.6M
| $405K | ﹤0.01% |
4,391
+148
| +3% | +$16.6K |
|
4479
CALL
Flux Power
FLUX
$10.9M
| $405K | ﹤0.01% |
+34,900
| New | +$380K |
|
4480
CALL
Ocean Power Technologies
OPTT
$41.5M
| $405K | ﹤0.01% |
162,300
+161,588
| +22,695% | +$400K |
|
4481
Travel + Leisure Co
TNL
$4.76B
| $405K | ﹤0.01% |
+6,826
| New | +$432K |
|
4482
WillScot Mobile Mini Holdings
WSC
$4.37B
| $405K | ﹤0.01% |
14,556
+5,907
| +68% | +$170K |
|
|
CONN
4483
CALL
DELISTED
Conn's Inc.
CONN
| $405K | ﹤0.01% |
15,900
+15,547
| +4,404% | +$359K |
|
|
AKRO
4484
PUT
DELISTED
Akero Therapeutics
AKRO
| $404K | ﹤0.01% |
16,300
+14,702
| +920% | +$413K |
|
4485
ARK Space & Defense Innovation ETF
ARKX
$765M
| $404K | ﹤0.01% |
+19,270
| New | +$395K |
|
4486
CALL
Bank of Hawaii
BOH
$3.14B
| $404K | ﹤0.01% |
4,800
+4,761
| +12,208% | +$427K |
|
4487
PUT
Marqeta
MQ
$1.93B
| $404K | ﹤0.01% |
+3,600
| New | +$429K |
|
4488
Agios Pharmaceuticals
AGIO
$2.08B
| $403K | ﹤0.01% |
+7,322
| New | +$409K |
|
4489
PUT
Allegion
ALLE
$13.5B
| $403K | ﹤0.01% |
2,900
+2,882
| +16,011% | +$394K |
|
|
BGFV
4490
DELISTED
Big 5 Sporting Goods
BGFV
| $403K | ﹤0.01% |
15,718
+11,113
| +241% | +$273K |
|
4491
PUT
Everest Group
EG
$15.6B
| $403K | ﹤0.01% |
+1,600
| New | +$416K |
|
|
SOHU
4492
PUT
Sohu.com
SOHU
$352M
| $403K | ﹤0.01% |
21,700
+21,577
| +17,542% | +$385K |
|
4493
PUT
Tronox
TROX
$967M
| $403K | ﹤0.01% |
+18,000
| New | +$395K |
|
|
LL
4494
CALL
DELISTED
LL Flooring Holdings, Inc.
LL
| $403K | ﹤0.01% |
19,100
+18,925
| +10,814% | +$446K |
|
4495
PUT
Green Brick Partners
GRBK
$3.09B
| $402K | ﹤0.01% |
17,700
+17,618
| +21,485% | +$422K |
|
4496
PUT
Snap-on
SNA
$21.5B
| $402K | ﹤0.01% |
1,800
+1,754
| +3,813% | +$420K |
|
4497
PUT
Shutterstock
SSTK
$209M
| $402K | ﹤0.01% |
4,100
+3,999
| +3,959% | +$367K |
|
4498
Tiptree Inc
TIPT
$694M
| $402K | ﹤0.01% |
+43,291
| New | +$457K |
|
|
XXII
4499
PUT
22nd Century Group
XXII
$1.28M
| – | – |
0
| – | – |
|
|
NS
4500
CALL
DELISTED
NuStar Energy L.P.
NS
| $402K | ﹤0.01% |
22,300
+21,835
| +4,696% | +$404K |
|
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.