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 | |
|---|---|---|---|---|---|---|
|
HOOK
7126
DELISTED
HOOKIPA Pharma
HOOK
| $75K | ﹤0.01% |
+825
| New | +$110K |
|
7127
Northwest Bancshares
NWBI
$2.3B
| $75K | ﹤0.01% |
+5,559
| New | +$78.5K |
|
|
NXRT
7128
NexPoint Residential Trust
NXRT
$677M
| $75K | ﹤0.01% |
+1,368
| New | +$70.4K |
|
7129
PUT
QuickLogic
QUIK
$228M
| $75K | ﹤0.01% |
10,500
+10,253
| +4,151% | +$66.9K |
|
|
RTB
7130
CALL
RTB Digital
RTB
$226M
| $75K | ﹤0.01% |
+18
| New | +$75.9K |
|
7131
CALL
SITE Centers
SITC
$227M
| $75K | ﹤0.01% |
6,409
+6,347
| +10,237% | +$72.7K |
|
7132
CALL
Talos Energy
TALO
$2.44B
| $75K | ﹤0.01% |
4,800
+4,556
| +1,867% | +$62.9K |
|
7133
PUT
NextTrip
NTRP
$24.3M
| $75K | ﹤0.01% |
970
+957
| +7,362% | +$70.9K |
|
|
MOON
7134
DELISTED
Direxion Moonshot Innovators ETF
MOON
| $75K | ﹤0.01% |
+2,057
| New | +$75.2K |
|
|
DSKE
7135
PUT
DELISTED
Daseke, Inc. Common Stock
DSKE
| $75K | ﹤0.01% |
11,600
+11,401
| +5,729% | +$82.8K |
|
|
CYBE
7136
DELISTED
Cyberoptics Corp
CYBE
| $75K | ﹤0.01% |
1,855
+1,671
| +908% | +$51.9K |
|
|
SAFM
7137
CALL
DELISTED
Sanderson Farms Inc
SAFM
| $75K | ﹤0.01% |
400
+388
| +3,233% | +$65.3K |
|
|
MGLN
7138
PUT
DELISTED
Magellan Health Services, Inc.
MGLN
| $75K | ﹤0.01% |
800
+637
| +391% | +$60K |
|
7139
Bumble
BMBL
$380M
| $74K | ﹤0.01% |
1,285
-14,402
| -92% | -$760K |
|
7140
BeyondSpring
BYSI
$46.5M
| $74K | ﹤0.01% |
7,180
+6,833
| +1,969% | +$72.1K |
|
7141
CALL
Compugen
CGEN
$220M
| $74K | ﹤0.01% |
9,000
+8,749
| +3,486% | +$71K |
|
7142
Quest Diagnostics
DGX
$25.9B
| $74K | ﹤0.01% |
561
+506
| +920% | +$66.3K |
|
7143
CALL
Dynagas LNG Partners
DLNG
$134M
| $74K | ﹤0.01% |
22,500
+22,486
| +160,614% | +$64K |
|
7144
PUT
Funko
FNKO
$338M
| $74K | ﹤0.01% |
3,500
+3,321
| +1,855% | +$75.6K |
|
7145
PUT
Disc Medicine
IRON
$3.03B
| $74K | ﹤0.01% |
+383
| New | +$126K |
|
7146
ServiceNow
NOW
$114B
| $74K | ﹤0.01% |
675
-83,680
| -99% | -$8.48M |
|
|
THR
7147
PUT
DELISTED
Thermon Group Holdings
THR
| $74K | ﹤0.01% |
4,400
+4,278
| +3,507% | +$79.6K |
|
7148
CALL
Upland Software
UPLD
$13.6M
| $74K | ﹤0.01% |
180
+176
| +4,400% | +$77.4K |
|
7149
United Parcel Service
UPS
$89.5B
| $74K | ﹤0.01% |
360
+210
| +140% | +$42K |
|
7150
Vontier
VNT
$4.49B
| $74K | ﹤0.01% |
2,301
-15,653
| -87% | -$516K |
|
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.