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 | |
|---|---|---|---|---|---|---|
1626
PUT
Wabtec
WAB
$51.1B
| $3.13M | ﹤0.01% |
38,000
+37,598
| +9,353% | +$3.05M |
|
1627
PUT
Playboy Inc
PLBY
$141M
| $3.13M | ﹤0.01% |
80,400
+79,747
| +12,212% | +$3.36M |
|
1628
PUT
STAAR Surgical
STAA
$1.16B
| $3.13M | ﹤0.01% |
20,500
+20,455
| +45,456% | +$2.69M |
|
1629
PUT
Gartner
IT
$9.41B
| $3.12M | ﹤0.01% |
12,900
+12,841
| +21,764% | +$2.81M |
|
1630
CALL
M&T Bank
MTB
$36.2B
| $3.12M | ﹤0.01% |
21,500
+21,262
| +8,934% | +$3.32M |
|
1631
PUT
PPG Industries
PPG
$25.9B
| $3.12M | ﹤0.01% |
18,400
+18,317
| +22,069% | +$3.14M |
|
|
AMRS
1632
CALL
DELISTED
Amyris Inc.
AMRS
| $3.12M | ﹤0.01% |
+190,500
| New | +$2.84M |
|
1633
CALL
Rockwell Automation
ROK
$51.4B
| $3.12M | ﹤0.01% |
10,900
+10,833
| +16,169% | +$2.92M |
|
1634
CALL
Blink Charging
BLNK
$75.2M
| $3.11M | ﹤0.01% |
75,600
+75,078
| +14,383% | +$2.79M |
|
1635
CALL
Ferrari
RACE
$63.3B
| $3.11M | ﹤0.01% |
15,100
+14,919
| +8,243% | +$3.11M |
|
1636
PUT
Jack in the Box
JACK
$278M
| $3.11M | ﹤0.01% |
27,900
+27,757
| +19,410% | +$3.25M |
|
|
NEX
1637
DELISTED
NexTier Oilfield Solutions Inc.
NEX
| $3.11M | ﹤0.01% |
653,260
+468,719
| +254% | +$2.06M |
|
|
TWO
1638
CALL
Two Harbors Investment
TWO
$1.27B
| $3.11M | ﹤0.01% |
102,750
+101,906
| +12,074% | +$3.03M |
|
1639
CALL
Boyd Gaming
BYD
$6.47B
| $3.1M | ﹤0.01% |
+50,500
| New | +$3.19M |
|
1640
CALL
Chemours
CC
$2.59B
| $3.1M | ﹤0.01% |
89,000
+88,366
| +13,938% | +$2.93M |
|
1641
Amplify Junior Silver Miners ETF
SILJ
$3.27B
| $3.1M | ﹤0.01% |
203,698
+83,524
| +70% | +$1.36M |
|
1642
iShares Russell 1000 Growth ETF
IWF
$122B
| $3.09M | ﹤0.01% |
+45,508
| New | +$2.93M |
|
1643
CALL
Adient
ADNT
$1.6B
| $3.09M | ﹤0.01% |
+68,300
| New | +$3.19M |
|
1644
PUT
Alaska Air
ALK
$5.15B
| $3.09M | ﹤0.01% |
+51,200
| New | +$3.45M |
|
1645
PUT
Transocean
RIG
$5.92B
| $3.08M | ﹤0.01% |
+681,700
| New | +$2.59M |
|
1646
CVS Health
CVS
$137B
| $3.08M | ﹤0.01% |
36,879
+18,489
| +101% | +$1.51M |
|
1647
Boston Scientific
BSX
$65.8B
| $3.07M | ﹤0.01% |
+71,913
| New | +$3.03M |
|
1648
CALL
AvalonBay Communities
AVB
$27.1B
| $3.07M | ﹤0.01% |
14,700
+14,562
| +10,552% | +$2.91M |
|
1649
PUT
Mattel
MAT
$4.17B
| $3.07M | ﹤0.01% |
152,600
+149,027
| +4,171% | +$3.08M |
|
1650
CALL
Vertiv
VRT
$112B
| $3.06M | ﹤0.01% |
112,200
+110,673
| +7,248% | +$2.65M |
|
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.