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 | |
|---|---|---|---|---|---|---|
3351
Encore Capital Group
ECPG
$2.03B
| $854K | ﹤0.01% |
18,025
+17,279
| +2,316% | +$751K |
|
3352
Valaris
VAL
$5.43B
| $854K | ﹤0.01% |
+29,574
| New | +$741K |
|
|
SHLX
3353
PUT
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $853K | ﹤0.01% |
57,800
+57,365
| +13,187% | +$860K |
|
3354
CALL
UDR
UDR
$12.8B
| $852K | ﹤0.01% |
17,400
+17,085
| +5,424% | +$804K |
|
3355
Coeur Mining
CDE
$15.8B
| $851K | ﹤0.01% |
95,945
+88,227
| +1,143% | +$851K |
|
3356
Ionis Pharmaceuticals
IONS
$9.25B
| $851K | ﹤0.01% |
21,354
+20,579
| +2,655% | +$806K |
|
3357
Invesco Dorsey Wright Technology Momentum ETF
PTF
$598M
| $851K | ﹤0.01% |
17,109
+16,509
| +2,752% | +$776K |
|
3358
PUT
Quanta Services
PWR
$93.1B
| $851K | ﹤0.01% |
+9,400
| New | +$883K |
|
|
GRA
3359
CALL
DELISTED
W.R. Grace & Co.
GRA
| $850K | ﹤0.01% |
12,300
+12,289
| +111,718% | +$828K |
|
3360
CALL
Adaptive Biotechnologies
ADPT
$3.61B
| $849K | ﹤0.01% |
20,800
+20,740
| +34,567% | +$806K |
|
3361
CALL
Opko Health
OPK
$936M
| $848K | ﹤0.01% |
+209,600
| New | +$822K |
|
|
QLTB
3362
CALL
DELISTED
ISHARES BAA BA RATED CORP BOND FUND
QLTB
| $848K | ﹤0.01% |
5,900
+5,843
| +10,251% | +$840K |
|
3363
Enbridge
ENB
$121B
| $847K | ﹤0.01% |
21,173
-11,625
| -35% | -$450K |
|
3364
Wayfair
W
$12.5B
| $847K | ﹤0.01% |
2,684
+1,339
| +100% | +$419K |
|
|
LVOX
3365
CALL
DELISTED
LiveVox Holding, Inc. Class A Common Stock
LVOX
| $847K | ﹤0.01% |
101,500
+99,958
| +6,482% | +$987K |
|
3366
CALL
Evergy
EVRG
$19.8B
| $846K | ﹤0.01% |
14,000
+13,889
| +12,513% | +$869K |
|
|
MMP
3367
PUT
DELISTED
Magellan Midstream Partners, L.P.
MMP
| $846K | ﹤0.01% |
17,300
+16,746
| +3,023% | +$812K |
|
3368
Conagra Brands
CAG
$7.29B
| $845K | ﹤0.01% |
23,253
-1,130
| -5% | -$42.3K |
|
3369
CALL
Rackspace Technology
RXT
$980M
| $845K | ﹤0.01% |
43,100
+42,254
| +4,995% | +$936K |
|
3370
Vornado Realty Trust
VNO
$7.43B
| $845K | ﹤0.01% |
18,108
+6,846
| +61% | +$320K |
|
3371
PUT
Eos Energy Enterprises
EOSE
$1.28B
| $844K | ﹤0.01% |
47,000
+46,797
| +23,053% | +$754K |
|
3372
Amplify Travel Tech ETF
AWAY
$24.9M
| $843K | ﹤0.01% |
28,311
+8,476
| +43% | +$257K |
|
3373
PUT
ImmunityBio
IBRX
$7.32B
| $843K | ﹤0.01% |
59,100
+58,228
| +6,678% | +$962K |
|
3374
CALL
St. Joe Company
JOE
$3.56B
| $843K | ﹤0.01% |
18,900
+18,710
| +9,847% | +$844K |
|
3375
Global X US Infrastructure Development ETF
PAVE
$14.2B
| $842K | ﹤0.01% |
32,726
-55,397
| -63% | -$1.44M |
|
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.