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 | |
|---|---|---|---|---|---|---|
4151
CALL
ONE Gas
OGS
$5.06B
| $504K | ﹤0.01% |
6,800
+6,767
| +20,506% | +$521K |
|
4152
CALL
Ironwood Pharmaceuticals
IRWD
$626M
| $503K | ﹤0.01% |
39,100
+38,522
| +6,665% | +$441K |
|
4153
PUT
Primoris Services
PRIM
$4.28B
| $503K | ﹤0.01% |
17,100
+17,019
| +21,011% | +$549K |
|
|
QELL
4154
DELISTED
Qell Acquisition Corp. Class A Ordinary Shares
QELL
| $503K | ﹤0.01% |
+50,612
| New | +$504K |
|
4155
PUT
Arbutus Biopharma
ABUS
$871M
| $502K | ﹤0.01% |
+165,900
| New | +$514K |
|
4156
Array Technologies
ARRY
$785M
| $502K | ﹤0.01% |
+32,221
| New | +$679K |
|
4157
Chord Energy
CHRD
$7.25B
| $502K | ﹤0.01% |
+5,002
| New | +$412K |
|
4158
CALL
Equinor
EQNR
$90.9B
| $502K | ﹤0.01% |
23,700
+23,417
| +8,275% | +$493K |
|
4159
PUT
LoveSac
LOVE
$248M
| $502K | ﹤0.01% |
6,300
+6,128
| +3,563% | +$456K |
|
4160
PUT
MSC Industrial Direct
MSM
$6.97B
| $502K | ﹤0.01% |
5,600
+5,564
| +15,456% | +$509K |
|
4161
PUT
NiSource
NI
$21.9B
| $502K | ﹤0.01% |
20,500
+20,346
| +13,212% | +$517K |
|
4162
PUT
Skillsoft
SKIL
$63.8M
| $502K | ﹤0.01% |
2,550
+2,479
| +3,492% | +$497K |
|
4163
Teucrium Wheat Fund
WEAT
$294M
| $502K | ﹤0.01% |
14,840
-578
| -4% | -$19.3K |
|
4164
Yelp
YELP
$1.51B
| $502K | ﹤0.01% |
+12,586
| New | +$500K |
|
4165
Exelixis
EXEL
$14.2B
| $501K | ﹤0.01% |
27,540
+25,875
| +1,554% | +$603K |
|
4166
CALL
Modine Manufacturing
MOD
$11B
| $501K | ﹤0.01% |
30,200
+30,189
| +274,445% | +$494K |
|
4167
CALL
Offerpad Solutions
OPAD
$19.3M
| $501K | ﹤0.01% |
337
+335
| +16,750% | +$500K |
|
4168
Sasol
SSL
$7.03B
| $501K | ﹤0.01% |
32,704
+1,953
| +6% | +$31.8K |
|
|
WIMI
4169
CALL
WiMi Hologram Cloud
WIMI
$21M
| $501K | ﹤0.01% |
9,130
+9,042
| +10,275% | +$508K |
|
|
CELL
4170
CALL
DELISTED
PhenomeX Inc. Common Stock
CELL
| $501K | ﹤0.01% |
11,200
+11,073
| +8,719% | +$513K |
|
|
ORPH
4171
DELISTED
Orphazyme A/S
ORPH
| $501K | ﹤0.01% |
+68,264
| New | +$550K |
|
|
MGLN
4172
DELISTED
Magellan Health Services, Inc.
MGLN
| $501K | ﹤0.01% |
5,324
+1,143
| +27% | +$108K |
|
4173
Omnicom Group
OMC
$24.6B
| $500K | ﹤0.01% |
6,254
+1,177
| +23% | +$95.6K |
|
4174
Crown Holdings
CCK
$13.2B
| $499K | ﹤0.01% |
+4,885
| New | +$515K |
|
4175
PUT
Denison Mines
DNN
$2.49B
| $499K | ﹤0.01% |
419,700
+415,106
| +9,036% | +$498K |
|
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.