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 | |
|---|---|---|---|---|---|---|
651
Intuit
INTU
$77.8B
| $11.9M | 0.01% |
24,257
+60
| +0.2% | +$32.3K |
|
652
CALL
DexCom
DXCM
$27.6B
| $11.9M | 0.01% |
111,600
+400
| +0.4% | +$50.4K |
|
|
SPLK
653
DELISTED
Splunk Inc
SPLK
| $11.9M | 0.01% |
84,331
-1,668
| -2% | -$243K |
|
654
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$432M
| $11.9M | 0.01% |
480,400
+27,100
| +6% | +$675K |
|
|
COUP
655
PUT
DELISTED
Coupa Software Incorporated
COUP
| $11.9M | 0.01% |
45,200
-800
| -2% | -$188K |
|
656
CALL
Paycom
PAYC
$6.5B
| $11.8M | 0.01% |
31,700
+200
| +0.6% | +$89.1K |
|
657
PUT
CRISPR Therapeutics
CRSP
$4.65B
| $11.8M | 0.01% |
75,400
+2,200
| +3% | +$276K |
|
658
PUT
Clover Health Investments
CLOV
$2.46B
| $11.7M | 0.01% |
951,700
-44,800
| -4% | -$383K |
|
659
CALL
MGM Resorts International
MGM
$11.6B
| $11.7M | 0.01% |
269,400
+700
| +0.3% | +$28.5K |
|
|
CPE
660
CALL
DELISTED
Callon Petroleum Company
CPE
| $11.7M | 0.01% |
196,500
+3,200
| +2% | +$124K |
|
661
PUT
Allstate
ALL
$64.8B
| $11.5M | 0.01% |
86,900
| – | – |
|
662
CALL
Best Buy
BBY
$18.4B
| $11.5M | 0.01% |
98,500
+10,300
| +12% | +$1.16M |
|
663
PUT
Dollar General
DG
$26.5B
| $11.4M | 0.01% |
52,500
+200
| +0.4% | +$45.1K |
|
664
CALL
PNC Financial Services
PNC
$101B
| $11.4M | 0.01% |
59,400
+1,100
| +2% | +$208K |
|
665
CALL
Domino's
DPZ
$10.6B
| $11.4M | 0.01% |
24,400
| – | – |
|
666
VanEck Oil Services ETF
OIH
$2.04B
| $11.4M | 0.01% |
49,872
-38
| -0.1% | -$7.23K |
|
|
GAP
667
CALL
The Gap Inc
GAP
$7.07B
| $11.4M | 0.01% |
338,900
+95,500
| +39% | +$2.64M |
|
668
CALL
Toyota
TM
$213B
| $11.4M | 0.01% |
64,700
-800
| -1% | -$143K |
|
669
PUT
Ulta Beauty
ULTA
$20.8B
| $11.3M | 0.01% |
32,500
+100
| +0.3% | +$36.1K |
|
670
PUT
APA Corp
APA
$12.8B
| $11.3M | 0.01% |
516,500
+900
| +0.2% | +$17.2K |
|
671
PUT
Canadian Pacific Kansas City
CP
$81.1B
| $11.3M | 0.01% |
147,500
+1,300
| +0.9% | +$92.6K |
|
672
PUT
Toronto Dominion Bank
TD
$200B
| $11.3M | 0.01% |
159,100
| – | – |
|
673
CALL
Dow Inc
DOW
$22.5B
| $11.3M | 0.01% |
177,200
-8,500
| -5% | -$520K |
|
674
CALL
Enterprise Products Partners
EPD
$84.1B
| $11.1M | 0.01% |
454,500
-2,500
| -0.5% | -$56.8K |
|
675
CALL
Kraft Heinz
KHC
$30.8B
| $11.1M | 0.01% |
274,700
+3,600
| +1% | +$136K |
|
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.