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 | |
|---|---|---|---|---|---|---|
|
IPOD
1301
CALL
DELISTED
Social Capital Hedosophia Holdings Corp. IV
IPOD
| $4.38M | ﹤0.01% |
421,700
+420,244
| +28,863% | +$4.45M |
|
1302
PUT
StoneCo
STNE
$2.62B
| $4.38M | ﹤0.01% |
65,300
+64,969
| +19,628% | +$4.21M |
|
1303
PUT
ScottsMiracle-Gro
SMG
$4.03B
| $4.38M | ﹤0.01% |
22,800
+22,520
| +8,043% | +$4.97M |
|
1304
CALL
Quanta Services
PWR
$93.9B
| $4.37M | ﹤0.01% |
+48,300
| New | +$4.54M |
|
1305
PUT
Thor Industries
THO
$3.99B
| $4.37M | ﹤0.01% |
38,700
+38,627
| +52,914% | +$4.91M |
|
1306
PUT
Apollo Global Management
APO
$70.7B
| $4.37M | ﹤0.01% |
70,300
+69,259
| +6,653% | +$3.84M |
|
1307
PUT
Pegasystems
PEGA
$4.41B
| $4.37M | ﹤0.01% |
62,800
+62,588
| +29,523% | +$3.95M |
|
1308
CALL
Alnylam Pharmaceuticals
ALNY
$36.3B
| $4.36M | ﹤0.01% |
25,700
+25,664
| +71,289% | +$3.76M |
|
|
CVAC
1309
PUT
DELISTED
CureVac
CVAC
| $4.35M | ﹤0.01% |
59,200
+58,990
| +28,090% | +$5.9M |
|
1310
Comcast
CMCSA
$79.7B
| $4.34M | ﹤0.01% |
76,214
+49,049
| +181% | +$2.74M |
|
1311
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $4.34M | ﹤0.01% |
41,800
+41,161
| +6,441% | +$3.25M |
|
1312
CALL
Deckers Outdoor
DECK
$13.3B
| $4.34M | ﹤0.01% |
67,800
+67,758
| +161,329% | +$3.82M |
|
1313
PUT
Texas Roadhouse
TXRH
$12.7B
| $4.34M | ﹤0.01% |
45,100
+44,821
| +16,065% | +$4.41M |
|
1314
PUT
Johnson Controls International
JCI
$87.5B
| $4.34M | ﹤0.01% |
63,200
+63,048
| +41,479% | +$4.07M |
|
1315
PUT
Wheaton Precious Metals
WPM
$50.6B
| $4.33M | ﹤0.01% |
98,300
+96,820
| +6,542% | +$4.31M |
|
1316
PUT
ZTO Express
ZTO
$18.2B
| $4.32M | ﹤0.01% |
+142,500
| New | +$4.4M |
|
1317
CALL
Gogo Inc
GOGO
$515M
| $4.32M | ﹤0.01% |
+379,700
| New | +$4.39M |
|
|
SAVE
1318
PUT
DELISTED
Spirit Airlines, Inc.
SAVE
| $4.31M | ﹤0.01% |
+141,700
| New | +$4.98M |
|
1319
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $4.31M | ﹤0.01% |
+50,900
| New | +$4.38M |
|
1320
CALL
American Electric Power
AEP
$73.7B
| $4.3M | ﹤0.01% |
50,900
+49,444
| +3,396% | +$4.26M |
|
1321
PUT
Mettler-Toledo International
MTD
$26.8B
| $4.29M | ﹤0.01% |
+3,100
| New | +$4M |
|
1322
PUT
GDS Holdings
GDS
$6.34B
| $4.29M | ﹤0.01% |
54,700
+53,734
| +5,563% | +$4.17M |
|
1323
CALL
OneMain Financial
OMF
$6.9B
| $4.29M | ﹤0.01% |
+71,600
| New | +$4.05M |
|
1324
CALL
HCA Healthcare
HCA
$84.8B
| $4.28M | ﹤0.01% |
20,700
+20,334
| +5,556% | +$4.14M |
|
1325
CALL
Plains All American Pipeline
PAA
$17.4B
| $4.27M | ﹤0.01% |
376,100
+374,375
| +21,703% | +$3.85M |
|
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.