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 | |
|---|---|---|---|---|---|---|
2676
Intellia Therapeutics
NTLA
$1.5B
| $1.34M | ﹤0.01% |
7,835
+7,348
| +1,509% | +$1.11M |
|
|
ELMS
2677
CALL
DELISTED
Electric Last Mile Solutions, Inc. Class A Common stock
ELMS
| $1.34M | ﹤0.01% |
127,600
+6,400
| +5% | +$54.8K |
|
|
NTR
2678
CALL
DELISTED
NEW YORK MORTGAGE TRUST INC
NTR
| $1.34M | ﹤0.01% |
298,100
-11,200
| -4% | -$50.5K |
|
2679
CALL
Kopin
KOPN
$663M
| $1.34M | ﹤0.01% |
169,100
+7,300
| +5% | +$44.3K |
|
2680
CALL
Parsons
PSN
$6.28B
| $1.34M | ﹤0.01% |
33,800
| – | – |
|
2681
CALL
Coeur Mining
CDE
$15.6B
| $1.34M | ﹤0.01% |
151,800
+400
| +0.3% | +$2.84K |
|
|
PRTY
2682
DELISTED
Party City Holdco Inc.
PRTY
| $1.34M | ﹤0.01% |
139,971
+10,954
| +8% | +$83.4K |
|
|
WBT
2683
CALL
DELISTED
Welbilt, Inc.
WBT
| $1.34M | ﹤0.01% |
57,300
| – | – |
|
2684
Sony
SONY
$123B
| $1.34M | ﹤0.01% |
68,145
+3,385
| +5% | +$70.9K |
|
2685
CALL
Ecolab
ECL
$75.6B
| $1.34M | ﹤0.01% |
6,400
+100
| +2% | +$21.9K |
|
2686
CALL
Royalty Pharma
RPRX
$26.1B
| $1.34M | ﹤0.01% |
31,700
-700
| -2% | -$27.2K |
|
|
TEN
2687
PUT
DELISTED
Tenneco Inc. Class A Voting Common Stock
TEN
| $1.34M | ﹤0.01% |
67,300
| – | – |
|
|
LAC
2688
PUT
DELISTED
Lithium Americas Corp. Common Shares
LAC
| $1.34M | ﹤0.01% |
90,700
-200
| -0.2% | -$3.52K |
|
2689
Genius Sports
GENI
$1.73B
| $1.34M | ﹤0.01% |
71,940
-6,285
| -8% | -$115K |
|
2690
CALL
Oppenheimer Holdings
OPY
$1.17B
| $1.34M | ﹤0.01% |
26,000
| – | – |
|
2691
PUT
Cardlytics
CDLX
$21M
| $1.33M | ﹤0.01% |
1,040
| – | – |
|
2692
CALL
AES
AES
$10.6B
| $1.33M | ﹤0.01% |
50,700
| – | – |
|
2693
CALL
LyondellBasell Industries
LYB
$19.5B
| $1.33M | ﹤0.01% |
12,900
| – | – |
|
2694
Carrier Global
CARR
$57.2B
| $1.33M | ﹤0.01% |
27,353
+598
| +2% | +$32.2K |
|
2695
PUT
nCino
NCNO
$1.81B
| $1.33M | ﹤0.01% |
21,700
| – | – |
|
|
TDAY
2696
CALL
USA Today Co
TDAY
$1.23B
| $1.33M | ﹤0.01% |
246,600
+400
| +0.2% | +$2.35K |
|
2697
Marathon Digital Holdings
MARA
$4.62B
| $1.33M | ﹤0.01% |
43,273
-9,187
| -18% | -$299K |
|
|
SP
2698
PUT
DELISTED
SP Plus Corporation
SP
| $1.33M | ﹤0.01% |
42,700
| – | – |
|
|
SII
2699
CALL
Sprott
SII
$2.65B
| $1.33M | ﹤0.01% |
33,600
+300
| +0.9% | +$11K |
|
2700
CALL
Ambev
ABEV
$47.3B
| $1.32M | ﹤0.01% |
392,100
+49,600
| +14% | +$157K |
|
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.