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 | |
|---|---|---|---|---|---|---|
|
AKRO
4976
DELISTED
Akero Therapeutics
AKRO
| $301K | ﹤0.01% |
12,142
-55,921
| -82% | -$1.57M |
|
4977
CALL
Angi Inc
ANGI
$247M
| $301K | ﹤0.01% |
2,230
+2,188
| +5,210% | +$318K |
|
|
EVOK
4978
CALL
DELISTED
Evoke Pharma
EVOK
| $301K | ﹤0.01% |
1,527
+1,511
| +9,444% | +$324K |
|
4979
Immersion
IMMR
$243M
| $301K | ﹤0.01% |
34,325
-6,906
| -17% | -$59.2K |
|
4980
PUT
Perdoceo Education
PRDO
$2.17B
| $301K | ﹤0.01% |
24,600
+24,514
| +28,505% | +$300K |
|
4981
CALL
Dorman Products
DORM
$4.22B
| $300K | ﹤0.01% |
2,900
+2,841
| +4,815% | +$291K |
|
4982
F5
FFIV
$22B
| $300K | ﹤0.01% |
+1,610
| New | +$310K |
|
4983
PUT
Heritage Insurance Holdings
HRTG
$903M
| $300K | ﹤0.01% |
+35,000
| New | +$323K |
|
4984
Insperity
NSP
$2.03B
| $300K | ﹤0.01% |
+3,322
| New | +$296K |
|
|
ENBL
4985
DELISTED
ENABLE MIDSTREAM PARTNERS, LP
ENBL
| $300K | ﹤0.01% |
32,965
-3,409
| -9% | -$27.9K |
|
4986
American Eagle Outfitters
AEO
$2.94B
| $299K | ﹤0.01% |
7,983
-8,356
| -51% | -$290K |
|
4987
PUT
Anterix
ATEX
$1.72B
| $299K | ﹤0.01% |
5,000
+4,886
| +4,286% | +$245K |
|
|
PHX
4988
CALL
DELISTED
PHX Minerals
PHX
| $299K | ﹤0.01% |
80,600
+80,392
| +38,650% | +$244K |
|
4989
CALL
Sanmina
SANM
$8.78B
| $299K | ﹤0.01% |
7,700
+7,687
| +59,131% | +$317K |
|
4990
CALL
abrdn Physical Silver Shares ETF
SIVR
$3.98B
| $299K | ﹤0.01% |
11,900
+11,766
| +8,781% | +$303K |
|
|
IEA
4991
CALL
DELISTED
Infrastructure and Energy Alternatives, Inc. Common Stock
IEA
| $299K | ﹤0.01% |
23,300
+22,882
| +5,474% | +$287K |
|
|
VRS
4992
PUT
DELISTED
Verso Corporation
VRS
| $299K | ﹤0.01% |
16,900
+16,731
| +9,900% | +$276K |
|
|
LONA
4993
LeonaBio Inc
LONA
$66.1M
| $298K | ﹤0.01% |
+2,917
| New | +$509K |
|
4994
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$142B
| $298K | ﹤0.01% |
48,000
+47,242
| +6,232% | +$279K |
|
|
CLSD
4995
CALL
DELISTED
Clearside Biomedical
CLSD
| $298K | ﹤0.01% |
4,080
+4,060
| +20,300% | +$189K |
|
4996
CALL
CVB Financial
CVBF
$4.02B
| $298K | ﹤0.01% |
+14,500
| New | +$317K |
|
4997
ProShares Ultra MSCI Emerging Markets
EET
$31.4M
| $298K | ﹤0.01% |
2,771
+881
| +47% | +$91.8K |
|
4998
CALL
Frontdoor
FTDR
$5.27B
| $298K | ﹤0.01% |
6,000
+5,802
| +2,930% | +$306K |
|
4999
PUT
Sociedad Química y Minera de Chile
SQM
$19.3B
| $298K | ﹤0.01% |
6,300
+6,227
| +8,530% | +$307K |
|
|
MDRX
5000
DELISTED
Veradigm Inc. Common Stock
MDRX
| $298K | ﹤0.01% |
16,151
-4,077
| -20% | -$68.6K |
|
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.