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 | |
|---|---|---|---|---|---|---|
2601
iRhythm Holdings
IRTC
$3.59B
| $1.42M | ﹤0.01% |
22,310
-1,900
| -8% | -$101K |
|
2602
CALL
Hims & Hers Health
HIMS
$6.5B
| $1.42M | ﹤0.01% |
129,600
-200
| -0.2% | -$1.69K |
|
2603
PUT
Senseonics Holdings Inc
SENS
$254M
| $1.42M | ﹤0.01% |
20,290
+310
| +2% | +$21K |
|
|
ARNC
2604
PUT
DELISTED
Arconic Corporation
ARNC
| $1.42M | ﹤0.01% |
39,900
| – | – |
|
2605
PUT
American Outdoor Brands
AOUT
$162M
| $1.42M | ﹤0.01% |
39,400
| – | – |
|
2606
PUT
FerroAtlántica
GSM
$628M
| $1.42M | ﹤0.01% |
233,400
| – | – |
|
2607
CALL
AngloGold Ashanti
AU
$40.3B
| $1.42M | ﹤0.01% |
76,000
-1,000
| -1% | -$17.3K |
|
2608
PUT
Hyliion Holdings
HYLN
$663M
| $1.42M | ﹤0.01% |
124,200
+400
| +0.3% | +$3.69K |
|
2609
HSBC
HSBC
$355B
| $1.41M | ﹤0.01% |
48,464
+7
| +0% | +$191 |
|
2610
CALL
Sundial Growers
SNDL
$325M
| $1.41M | ﹤0.01% |
153,780
+4,230
| +3% | +$33K |
|
|
PPD
2611
PUT
DELISTED
PPD, Inc. Common Stock
PPD
| $1.41M | ﹤0.01% |
30,600
| – | – |
|
2612
Lumentum
LITE
$59.4B
| $1.41M | ﹤0.01% |
16,779
-300
| -2% | -$25.2K |
|
2613
CALL
Penumbra
PEN
$12.5B
| $1.41M | ﹤0.01% |
5,100
| – | – |
|
2614
Lincoln National
LNC
$7.91B
| $1.41M | ﹤0.01% |
21,895
+5,406
| +33% | +$353K |
|
|
ARVL
2615
DELISTED
Arrival Ordinary Shares
ARVL
| $1.41M | ﹤0.01% |
1,807
+60
| +3% | +$38.3K |
|
2616
Alto Ingredients
ALTO
$360M
| $1.41M | ﹤0.01% |
233,073
+11,560
| +5% | +$58.3K |
|
2617
Seres Therapeutics
MCRB
$48M
| $1.4M | ﹤0.01% |
3,108
+644
| +26% | +$126K |
|
2618
CALL
Qualys
QLYS
$4.84B
| $1.4M | ﹤0.01% |
13,900
| – | – |
|
2619
TE Connectivity
TEL
$58.8B
| $1.4M | ﹤0.01% |
10,262
-100
| -1% | -$14.4K |
|
2620
QuidelOrtho
QDEL
$1.09B
| $1.4M | ﹤0.01% |
10,898
-200
| -2% | -$26.9K |
|
|
TWNK
2621
CALL
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $1.4M | ﹤0.01% |
85,100
-5,300
| -6% | -$85.8K |
|
2622
CALL
Expeditors International
EXPD
$22.9B
| $1.4M | ﹤0.01% |
11,000
| – | – |
|
2623
Bionano Genomics
BNGO
$12.7M
| $1.4M | ﹤0.01% |
342
+31
| +10% | +$108K |
|
|
EMBJ
2624
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $1.4M | ﹤0.01% |
94,500
| – | – |
|
2625
Sibanye-Stillwater
SBSW
$5.92B
| $1.4M | ﹤0.01% |
82,835
-754
| -0.9% | -$11.8K |
|
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.