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 | |
|---|---|---|---|---|---|---|
701
CALL
Prologis
PLD
$133B
| $10.6M | 0.01% |
88,100
| – | – |
|
702
PUT
Becton Dickinson
BDX
$42.2B
| $10.6M | 0.01% |
43,870
-4,613
| -10% | -$1.13M |
|
703
PUT
Pultegroup
PHM
$23.5B
| $10.5M | 0.01% |
188,800
+800
| +0.4% | +$41.6K |
|
704
CALL
Energy Transfer Partners
ET
$70.3B
| $10.5M | 0.01% |
983,300
+300
| +0% | +$2.88K |
|
705
PUT
Crocs
CROX
$6.59B
| $10.5M | 0.01% |
89,900
+600
| +0.7% | +$82.4K |
|
|
NBIS
706
CALL
Nebius Group N.V.
NBIS
$55.8B
| $10.5M | 0.01% |
148,900
+9,300
| +7% | +$678K |
|
|
SHNY
707
PUT
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $10.4M | 0.01% |
424,000
+9,100
| +2% | +$224K |
|
708
CALL
Digital Turbine
APPS
$983M
| $10.4M | 0.01% |
133,200
+5,000
| +4% | +$310K |
|
709
CALL
Sabre
SABR
$660M
| $10.4M | 0.01% |
825,900
-25,800
| -3% | -$293K |
|
710
Pinduoduo
PDD
$117B
| $10.4M | 0.01% |
85,321
+14,608
| +21% | +$1.42M |
|
711
CALL
Phillips 66
PSX
$84.8B
| $10.3M | 0.01% |
118,400
+4,300
| +4% | +$311K |
|
|
HES
712
PUT
DELISTED
Hess
HES
| $10.2M | 0.01% |
115,100
| – | – |
|
713
CALL
Hershey
HSY
$34.6B
| $10.2M | 0.01% |
58,700
+4,400
| +8% | +$777K |
|
714
CALL
Intellia Therapeutics
NTLA
$1.56B
| $10.2M | 0.01% |
59,400
-200
| -0.3% | -$30.3K |
|
715
PUT
C3.ai
AI
$1.23B
| $10.2M | 0.01% |
159,700
+3,500
| +2% | +$178K |
|
716
CALL
Shake Shack
SHAK
$2.26B
| $10.2M | 0.01% |
97,700
+3,300
| +3% | +$300K |
|
|
FISV
717
PUT
Fiserv Inc
FISV
$26.6B
| $10.1M | 0.01% |
93,500
-200
| -0.2% | -$22.3K |
|
718
PUT
Sunrun
RUN
$2.5B
| $10.1M | 0.01% |
180,180
+5,610
| +3% | +$268K |
|
719
PUT
Akamai
AKAM
$17.5B
| $10.1M | 0.01% |
86,300
+23,500
| +37% | +$2.69M |
|
|
SPWR
720
CALL
DELISTED
SunPower Corporation Common Stock
SPWR
| $10.1M | 0.01% |
349,600
+3,200
| +0.9% | +$74.8K |
|
721
PUT
Kimberly-Clark
KMB
$35.7B
| $10M | 0.01% |
75,200
+700
| +0.9% | +$95.2K |
|
722
Upstart Holdings
UPST
$2.59B
| $10M | 0.01% |
80,962
-3,249
| -4% | -$641K |
|
723
CALL
Stryker
SYK
$121B
| $10M | 0.01% |
38,100
-300
| -0.8% | -$80.2K |
|
|
PSTH
724
PUT
DELISTED
Pershing Square Tontine Holdings, Ltd.
PSTH
| $9.99M | 0.01% |
443,800
+1,000
| +0.2% | +$20.3K |
|
725
PUT
Lumentum
LITE
$64.4B
| $9.96M | 0.01% |
118,600
+2,100
| +2% | +$176K |
|
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.