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 | |
|---|---|---|---|---|---|---|
6576
Lesaka Technologies
LSAK
$396M
| $111K | ﹤0.01% |
23,611
+20,030
| +559% | +$104K |
|
6577
CALL
OSI Systems
OSIS
$3.65B
| $111K | ﹤0.01% |
1,100
+1,079
| +5,138% | +$105K |
|
6578
CALL
Snap-on
SNA
$21.2B
| $111K | ﹤0.01% |
500
+464
| +1,289% | +$111K |
|
6579
Standex International
SXI
$3.59B
| $111K | ﹤0.01% |
1,176
| – | – |
|
6580
PUT
UFP Industries
UFPI
$4.9B
| $111K | ﹤0.01% |
1,500
+1,495
| +29,900% | +$118K |
|
|
SEI
6581
Solaris Energy Infrastructure
SEI
$3.15B
| $111K | ﹤0.01% |
11,412
+658
| +6% | +$6.97K |
|
|
POL
6582
DELISTED
Polished.com Inc.
POL
| $111K | ﹤0.01% |
+580
| New | +$159K |
|
|
COR
6583
DELISTED
Coresite Realty Corporation
COR
| $111K | ﹤0.01% |
827
+691
| +508% | +$86.3K |
|
|
SWI
6584
CALL
DELISTED
SolarWinds Corporation Common Stock
SWI
| $111K | ﹤0.01% |
6,257
+6,092
| +3,692% | +$110K |
|
|
CBB
6585
CALL
DELISTED
Cincinnati Bell Inc.
CBB
| $111K | ﹤0.01% |
7,200
+7,199
| +719,900% | +$111K |
|
|
AGEN
6586
PUT
Agenus
AGEN
$312M
| $110K | ﹤0.01% |
1,029
+1,004
| +4,016% | +$75.3K |
|
6587
argenx
ARGX
$54.6B
| $110K | ﹤0.01% |
+367
| New | +$104K |
|
|
BKYI
6588
PUT
BIO-key International
BKYI
$4.76M
| $110K | ﹤0.01% |
161
+160
| +16,000% | +$105K |
|
6589
CALL
Installed Building Products
IBP
$6.01B
| $110K | ﹤0.01% |
900
+896
| +22,400% | +$109K |
|
6590
NeoGenomics
NEO
$1.96B
| $110K | ﹤0.01% |
2,436
-5,932
| -71% | -$263K |
|
|
PPBT
6591
CALL
Purple Biotech
PPBT
$1.31M
| $110K | ﹤0.01% |
113
+112
| +11,200% | +$103K |
|
6592
Direxion Daily Utilities Bull 3X ETF
UTSL
$40M
| $110K | ﹤0.01% |
3,982
+1,819
| +84% | +$55.4K |
|
6593
Veritone
VERI
$101M
| $110K | ﹤0.01% |
+5,590
| New | +$121K |
|
|
FREE
6594
DELISTED
Whole Earth Brands, Inc. Class A Common Stock
FREE
| $110K | ﹤0.01% |
7,599
+4,835
| +175% | +$64.5K |
|
|
TRVN
6595
PUT
DELISTED
Trevena, Inc.
TRVN
| $110K | ﹤0.01% |
105
+104
| +10,400% | +$117K |
|
|
NIB
6596
DELISTED
iPath Bloomberg Cocoa Subindex Total Return ETN due June 24, 2038
NIB
| $110K | ﹤0.01% |
3,846
+1,830
| +91% | +$54.6K |
|
|
SWIR
6597
PUT
DELISTED
Sierra Wireless
SWIR
| $110K | ﹤0.01% |
5,800
+5,773
| +21,381% | +$89.9K |
|
6598
PUT
Arch Capital
ACGL
$34.3B
| $109K | ﹤0.01% |
2,800
+2,731
| +3,958% | +$108K |
|
6599
CALL
Bit Digital
BTBT
$463M
| $109K | ﹤0.01% |
16,000
+15,908
| +17,291% | +$169K |
|
6600
EverQuote
EVER
$892M
| $109K | ﹤0.01% |
+3,338
| New | +$111K |
|
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.