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 | |
|---|---|---|---|---|---|---|
501
PUT
Rio Tinto
RIO
$150B
| $17.5M | 0.02% |
211,500
+100
| +0% | +$7.8K |
|
502
CALL
Aon
AON
$75.2B
| $17.5M | 0.02% |
73,200
| – | – |
|
|
SCHW
503
CALL
Charles Schwab
SCHW
$175B
| $17.4M | 0.02% |
237,100
-3,300
| -1% | -$236K |
|
504
PUT
Kroger
KR
$35.3B
| $17.4M | 0.02% |
455,900
+17,300
| +4% | +$726K |
|
|
GAP
505
PUT
The Gap Inc
GAP
$7.07B
| $17.4M | 0.02% |
518,400
+32,200
| +7% | +$889K |
|
506
PUT
Medtronic
MDT
$105B
| $17.3M | 0.02% |
137,200
+1,500
| +1% | +$194K |
|
|
TYNS
507
PUT
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $17.2M | 0.02% |
153,900
+13,000
| +9% | +$1.45M |
|
508
CALL
Vertex Pharmaceuticals
VRTX
$120B
| $17.2M | 0.02% |
85,000
+100
| +0.1% | +$19.5K |
|
509
PUT
NextEra Energy
NEE
$186B
| $17.2M | 0.02% |
231,500
+1,500
| +0.7% | +$121K |
|
510
PUT
Diamondback Energy
FANG
$57.1B
| $17.2M | 0.02% |
172,300
+700
| +0.4% | +$56.2K |
|
511
Trade Desk
TTD
$8.26B
| $17.1M | 0.02% |
223,382
+28,584
| +15% | +$2.21M |
|
|
VMW
512
CALL
DELISTED
VMware, Inc
VMW
| $17.1M | 0.02% |
109,700
+500
| +0.5% | +$75.8K |
|
513
American Airlines Group
AAL
$9.78B
| $17.1M | 0.02% |
795,502
+21,454
| +3% | +$435K |
|
514
CALL
Devon Energy
DVN
$51.8B
| $17.1M | 0.02% |
571,000
+16,500
| +3% | +$468K |
|
|
RDS.A
515
PUT
DELISTED
Royal Dutch Shell PLC ADS Class A
RDS.A
| $17.1M | 0.02% |
416,100
+4,000
| +1% | +$161K |
|
516
PUT
BlackBerry
BB
$5.25B
| $17.1M | 0.02% |
1,401,300
+6,800
| +0.5% | +$71.3K |
|
|
517
CALL
GE Aerospace
GE
$354B
| $17M | 0.02% |
2,024,825
+1,787,492
| +753% | +$115M |
|
518
CALL
Dropbox
DBX
$6.69B
| $16.9M | 0.02% |
559,000
-2,600
| -0.5% | -$80.7K |
|
519
PUT
Logitech
LOGI
$15B
| $16.9M | 0.02% |
140,300
-500
| -0.4% | -$54K |
|
520
PUT
United Rentals
URI
$64.8B
| $16.8M | 0.02% |
52,300
+600
| +1% | +$201K |
|
521
CALL
Blackrock
BLK
$164B
| $16.8M | 0.02% |
19,100
+200
| +1% | +$179K |
|
522
PUT
Boston Scientific
BSX
$63.9B
| $16.7M | 0.02% |
385,700
+34,800
| +10% | +$1.54M |
|
523
CALL
QuantumScape Corp
QS
$3.61B
| $16.7M | 0.02% |
603,700
+69,600
| +13% | +$1.59M |
|
524
Plug Power
PLUG
$3.11B
| $16.7M | 0.02% |
500,917
-13,825
| -3% | -$370K |
|
525
PUT
Occidental Petroleum
OXY
$57.2B
| $16.7M | 0.02% |
528,900
+700
| +0.1% | +$18.7K |
|
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.