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 |
GE Aerospace
GE
|
+$36M |
| 2 |
Advanced Micro Devices
AMD
|
+$19.4M |
| 3 |
iShares MSCI EAFE ETF
EFA
|
+$10.2M |
| 4 |
Micron Technology
MU
|
+$6.31M |
| 5 |
Alibaba
BABA
|
+$6.19M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$25.9M |
| 2 |
SPDR Gold Trust
GLD
|
+$15.3M |
| 3 |
Amazon
AMZN
|
+$9.53M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.03M |
| 5 |
State Street Technology Select Sector SPDR ETF
XLK
|
+$7.73M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.49% |
| 2 | Consumer Discretionary | 0.39% |
| 3 | Communication Services | 0.27% |
| 4 | Healthcare | 0.25% |
| 5 | Financials | 0.25% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
551
PUT
Valero Energy
VLO
$92.3B
| $15.3M | 0.01% |
196,900
+4,500
| +2% | +$300K |
|
552
CALL
TripAdvisor
TRIP
$1.61B
| $15.3M | 0.01% |
377,400
+2,100
| +0.6% | +$75.3K |
|
553
PUT
Atlassian
TEAM
$21.7B
| $15.2M | 0.01% |
58,800
+200
| +0.3% | +$66.8K |
|
554
CALL
Philip Morris
PM
$303B
| $15.1M | 0.01% |
151,500
-3,200
| -2% | -$322K |
|
|
555
State Street Technology Select Sector SPDR ETF
XLK
$117B
| $15.1M | 0.01% |
204,622
-100,200
| -33% | -$7.73M |
|
556
PUT
The Mosaic Company
MOS
$7.24B
| $15.1M | 0.01% |
474,200
+15,600
| +3% | +$499K |
|
557
CALL
Johnson Controls International
JCI
$86.9B
| $15.1M | 0.01% |
218,100
-700
| -0.3% | -$50.6K |
|
558
PUT
Regeneron Pharmaceuticals
REGN
$68.3B
| $14.9M | 0.01% |
25,900
+900
| +4% | +$559K |
|
559
CALL
Palo Alto Networks
PANW
$273B
| $14.9M | 0.01% |
240,600
+5,400
| +2% | +$379K |
|
560
PUT
Align Technology
ALGN
$12.4B
| $14.7M | 0.01% |
23,800
+300
| +1% | +$204K |
|
561
PUT
iQIYI
IQ
$1.2B
| $14.7M | 0.01% |
968,600
-800
| -0.1% | -$8.3K |
|
562
PUT
TJX Companies
TJX
$172B
| $14.6M | 0.01% |
215,600
+2,400
| +1% | +$168K |
|
563
CALL
Illumina
ILMN
$28.9B
| $14.4M | 0.01% |
31,560
| – | – |
|
564
CALL
Intercontinental Exchange
ICE
$80.6B
| $14.4M | 0.01% |
121,400
| – | – |
|
565
CALL
TAL Education Group
TAL
$5.73B
| $14.4M | 0.01% |
616,400
+2,700
| +0.4% | +$24K |
|
566
PUT
SolarEdge
SEDG
$2.91B
| $14.4M | 0.01% |
52,300
+900
| +2% | +$245K |
|
567
Tilray
TLRY
$514M
| $14.4M | 0.01% |
80,593
+10,477
| +15% | +$1.44M |
|
|
B
568
CALL
Barrick Mining
B
$62.8B
| $14.4M | 0.01% |
697,400
+59,000
| +9% | +$1.18M |
|
569
CALL
Waste Management
WM
$94.9B
| $14.3M | 0.01% |
101,500
+1,700
| +2% | +$254K |
|
570
PUT
Arista Networks
ANET
$220B
| $14.3M | 0.01% |
630,400
| – | – |
|
571
PUT
SoFi Technologies
SOFI
$21.9B
| $14.3M | 0.01% |
783,000
-21,200
| -3% | -$332K |
|
|
572
iShares MSCI EAFE ETF
EFA
$77.1B
| $14.3M | 0.01% |
180,666
+128,083
| +244% | +$10.2M |
|
573
PUT
Tencent Music
TME
$14.4B
| $14.2M | 0.01% |
917,400
+7,600
| +0.8% | +$74.5K |
|
574
CALL
Macy's
M
$6.4B
| $14.2M | 0.01% |
751,600
+5,900
| +0.8% | +$118K |
|
575
PUT
Generac Holdings
GNRC
$12.6B
| $14.1M | 0.01% |
34,100
| – | – |
|
Similar funds
Simplex Trading's Q3 2021 Portfolio in Review
As of Q3 2021, Simplex Trading held 10,062 positions worth $107B, up 3.4% from $104B the previous quarter. Its ten largest holdings account for 41% of the portfolio.
Trading was light in Q3 2021: portfolio turnover was 3.5%. Simplex Trading opened 86 new positions and exited 271, leaving the 10,062-position portfolio largely intact.
By sector, the portfolio is most concentrated in Technology at 0.49% of assets, up from 0.47% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q3 2021 buy was Olo Inc: 143,230 shares worth $4.91M.
- Simplex Trading added most to GE Aerospace in Q3 2021, an estimated $36M increase.
- Simplex Trading's biggest Q3 2021 reduction was NVIDIA, cutting an estimated $25.9M.
- Simplex Trading fully exited Amazon in Q3 2021, selling an estimated $9.53M.
- Simplex Trading's ten largest holdings make up 41% of its $107B portfolio in Q3 2021.
- Simplex Trading opened 86 new positions and closed 271 in Q3 2021.
- Simplex Trading's portfolio value rose 3.4% quarter-over-quarter to $107B.
Based on Simplex Trading's 13F filing for Q3 2021, filed 28 Oct 2021.