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 | |
|---|---|---|---|---|---|---|
626
CALL
SAP
SAP
$174B
| $12.5M | 0.01% |
89,200
+5,500
| +7% | +$798K |
|
627
PUT
RingCentral
RNG
$3.16B
| $12.5M | 0.01% |
43,300
| – | – |
|
628
PUT
Vertex Pharmaceuticals
VRTX
$120B
| $12.5M | 0.01% |
61,900
| – | – |
|
|
SCIU
629
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $12.4M | 0.01% |
370,800
+1,600
| +0.4% | +$53.5K |
|
630
CALL
Dollar Tree
DLTR
$23.5B
| $12.4M | 0.01% |
124,000
+100
| +0.1% | +$9.62K |
|
631
CALL
Crown Castle
CCI
$33.8B
| $12.4M | 0.01% |
63,600
+400
| +0.6% | +$77.3K |
|
632
CALL
T-Mobile US
TMUS
$207B
| $12.4M | 0.01% |
85,000
+200
| +0.2% | +$27.9K |
|
633
Airbnb
ABNB
$83.1B
| $12.3M | 0.01% |
80,580
+30,201
| +60% | +$4.61M |
|
|
DFS
634
PUT
DELISTED
Discover Financial Services
DFS
| $12.3M | 0.01% |
102,900
-300
| -0.3% | -$37.6K |
|
635
PUT
Digital Turbine
APPS
$1.03B
| $12.3M | 0.01% |
157,000
+2,000
| +1% | +$124K |
|
636
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $12.3M | 0.01% |
278,700
+700
| +0.3% | +$33.2K |
|
637
PUT
Humana
HUM
$47.7B
| $12.3M | 0.01% |
27,400
+100
| +0.4% | +$42.4K |
|
638
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.5M
| $12.2M | 0.01% |
330,000
+300
| +0.1% | +$14.8K |
|
639
CALL
Kroger
KR
$35.3B
| $12.1M | 0.01% |
318,300
-6,800
| -2% | -$286K |
|
640
CALL
Northrop Grumman
NOC
$74.6B
| $12.1M | 0.01% |
33,000
| – | – |
|
641
CALL
Hilton Worldwide
HLT
$73.8B
| $12.1M | 0.01% |
98,100
-4,300
| -4% | -$544K |
|
642
CALL
ClearShares Piton Intermediate Fixed Income ETF
PIFI
$97.5M
| $12.1M | 0.01% |
492,000
+3,000
| +0.6% | +$299K |
|
643
Wynn Resorts
WYNN
$9.79B
| $12.1M | 0.01% |
98,719
-2,034
| -2% | -$201K |
|
|
FTCH
644
PUT
DELISTED
Farfetch Limited Class A Ordinary Shares
FTCH
| $12.1M | 0.01% |
238,300
+100
| +0% | +$4.43K |
|
645
PUT
KLA
KLAC
$280B
| $12.1M | 0.01% |
387,000
+35,000
| +10% | +$1.17M |
|
646
XPeng
XPEV
$12.3B
| $12M | 0.01% |
275,686
-42,975
| -13% | -$1.71M |
|
647
PUT
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$254M
| $12M | 0.01% |
1,256,800
+17,200
| +1% | +$314K |
|
648
Rocket Companies
RKT
$38B
| $12M | 0.01% |
631,646
+25,160
| +4% | +$440K |
|
649
PUT
Veeva Systems
VEEV
$30B
| $11.9M | 0.01% |
38,100
-100
| -0.3% | -$31.7K |
|
650
Beyond Meat
BYND
$307M
| $11.9M | 0.01% |
77,971
-22,737
| -23% | -$2.78M |
|
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.