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 | |
|---|---|---|---|---|---|---|
|
PRSU
3401
CALL
Pursuit Attractions and Hospitality Inc
PRSU
$1.46B
| $799K | ﹤0.01% |
16,000
+8,500
| +113% | +$380K |
|
3402
iShares MSCI Turkey ETF
TUR
$203M
| $798K | ﹤0.01% |
37,346
+11,186
| +43% | +$249K |
|
|
QNGY
3403
PUT
DELISTED
Quanergy Systems, Inc.
QNGY
| $798K | ﹤0.01% |
4,030
+2,000
| +99% | +$397K |
|
3404
CALL
eHealth
EHTH
$43.2M
| $797K | ﹤0.01% |
13,400
+300
| +2% | +$14K |
|
3405
PUT
Rush Street Interactive
RSI
$3.26B
| $797K | ﹤0.01% |
65,600
+800
| +1% | +$10.9K |
|
3406
SSR Mining
SSRM
$5.45B
| $797K | ﹤0.01% |
51,352
+100
| +0.2% | +$1.58K |
|
3407
PUT
Wingstop
WING
$3.74B
| $797K | ﹤0.01% |
5,100
+200
| +4% | +$33.9K |
|
|
CHS
3408
CALL
DELISTED
Chicos FAS, Inc.
CHS
| $797K | ﹤0.01% |
119,800
+2,500
| +2% | +$14.3K |
|
|
AVID
3409
DELISTED
Avid Technology Inc
AVID
| $797K | ﹤0.01% |
20,323
-200
| -1% | -$6.18K |
|
3410
Boston Properties
BXP
$11B
| $796K | ﹤0.01% |
6,931
-1,833
| -21% | -$209K |
|
3411
CALL
Kinsale Capital Group
KNSL
$8.24B
| $796K | ﹤0.01% |
4,700
| – | – |
|
|
BFI
3412
CALL
DELISTED
BurgerFi International, Inc. Common Stock
BFI
| $796K | ﹤0.01% |
80,100
-300
| -0.4% | -$3.08K |
|
3413
PUT
Acadia Pharmaceuticals
ACAD
$4.35B
| $795K | ﹤0.01% |
32,100
-100
| -0.3% | -$1.93K |
|
3414
AeroVironment
AVAV
$7.81B
| $795K | ﹤0.01% |
7,911
+219
| +3% | +$21.2K |
|
3415
CALL
Mitek Systems
MITK
$768M
| $795K | ﹤0.01% |
41,000
+200
| +0.5% | +$4.05K |
|
3416
Pan American Silver
PAAS
$18.6B
| $795K | ﹤0.01% |
28,007
+2,291
| +9% | +$59.8K |
|
3417
CALL
Uranium Energy
UEC
$4.9B
| $795K | ﹤0.01% |
301,500
+12,400
| +4% | +$31.1K |
|
3418
PUT
Adient
ADNT
$1.62B
| $794K | ﹤0.01% |
17,600
| – | – |
|
3419
Credicorp
BAP
$31.1B
| $794K | ﹤0.01% |
6,569
+300
| +5% | +$32.7K |
|
3420
CALL
Clearfield
CLFD
$436M
| $793K | ﹤0.01% |
20,800
| – | – |
|
3421
Ichor Holdings
ICHR
$2.73B
| $793K | ﹤0.01% |
14,934
-100
| -0.7% | -$4.57K |
|
3422
United States 12 Month Oil Fund,
USL
$44.8M
| $793K | ﹤0.01% |
30,608
-400
| -1% | -$10.1K |
|
|
BTNB
3423
PUT
DELISTED
Bridgetown 2 Holdings Limited Class A Ordinary Shares
BTNB
| $793K | ﹤0.01% |
78,800
| – | – |
|
|
EBIX
3424
CALL
DELISTED
Ebix Inc
EBIX
| $793K | ﹤0.01% |
23,700
-500
| -2% | -$14.7K |
|
3425
PUT
Coursera
COUR
$1.61B
| $792K | ﹤0.01% |
20,300
+2,100
| +12% | +$79.1K |
|
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.