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 | |
|---|---|---|---|---|---|---|
576
CALL
Colgate-Palmolive
CL
$73.3B
| $14.1M | 0.01% |
172,400
-800
| -0.5% | -$63.5K |
|
577
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $14.1M | 0.01% |
217,700
+9,200
| +4% | +$436K |
|
578
Novavax
NVAX
$1.3B
| $14M | 0.01% |
64,940
-927
| -1% | -$204K |
|
579
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$332M
| $14M | 0.01% |
126,300
| – | – |
|
580
S&P Global
SPGI
$127B
| $14M | 0.01% |
33,892
+826
| +2% | +$358K |
|
581
PUT
Lennar Class A
LEN
$19.8B
| $13.9M | 0.01% |
+141,521
| New | +$14M |
|
582
PUT
T-Mobile US
TMUS
$207B
| $13.9M | 0.01% |
95,600
-100
| -0.1% | -$13.9K |
|
583
CALL
Teledyne Technologies
TDY
$30.1B
| $13.9M | 0.01% |
32,900
| – | – |
|
584
Coinbase
COIN
$43.8B
| $13.9M | 0.01% |
57,372
+2,769
| +5% | +$682K |
|
585
CALL
Alcoa
AA
$12.2B
| $13.8M | 0.01% |
374,100
+6,700
| +2% | +$283K |
|
|
DISCK
586
PUT
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $13.7M | 0.01% |
441,700
+41,500
| +10% | +$1.11M |
|
587
PUT
Tyson Foods
TSN
$20.1B
| $13.7M | 0.01% |
185,900
+500
| +0.3% | +$37.7K |
|
588
CALL
Valero Energy
VLO
$92.3B
| $13.7M | 0.01% |
175,800
+25,100
| +17% | +$1.67M |
|
589
CALL
CRISPR Therapeutics
CRSP
$4.65B
| $13.6M | 0.01% |
86,800
+2,100
| +2% | +$264K |
|
590
CALL
Akamai
AKAM
$18.1B
| $13.5M | 0.01% |
115,600
-2,100
| -2% | -$240K |
|
|
EXAS
591
CALL
DELISTED
Exact Sciences
EXAS
| $13.5M | 0.01% |
109,000
+100
| +0.1% | +$10.6K |
|
592
CALL
Generac Holdings
GNRC
$12.6B
| $13.5M | 0.01% |
32,700
+300
| +0.9% | +$129K |
|
593
CALL
Match Group
MTCH
$8.87B
| $13.5M | 0.01% |
84,600
+5,800
| +7% | +$883K |
|
594
PUT
Sherwin-Williams
SHW
$78.9B
| $13.5M | 0.01% |
48,900
+100
| +0.2% | +$29.3K |
|
595
Procter & Gamble
PG
$347B
| $13.4M | 0.01% |
99,354
-1,341
| -1% | -$190K |
|
596
CALL
Okta
OKTA
$23.8B
| $13.4M | 0.01% |
55,800
+1,700
| +3% | +$422K |
|
597
CALL
Vipshop
VIPS
$7.05B
| $13.4M | 0.01% |
704,400
+18,200
| +3% | +$286K |
|
598
PUT
Under Armour Class C
UA
$3.02B
| $13.4M | 0.01% |
659,300
+3,600
| +0.5% | +$68.9K |
|
599
CALL
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $13.4M | 0.01% |
333,325
+7,300
| +2% | +$203K |
|
600
CALL
Advance Auto Parts
AAP
$3.35B
| $13.4M | 0.01% |
63,900
| – | – |
|
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.