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 | |
|---|---|---|---|---|---|---|
601
CALL
Sony
SONY
$123B
| $13.3M | 0.01% |
678,500
+24,000
| +4% | +$502K |
|
|
SIVB
602
PUT
DELISTED
SVB Financial Group
SIVB
| $13.3M | 0.01% |
23,600
+100
| +0.4% | +$58K |
|
|
NKLA
603
PUT
DELISTED
Nikola Corporation Common Stock
NKLA
| $13.3M | 0.01% |
26,133
+2,373
| +10% | +$831K |
|
604
CALL
Logitech
LOGI
$15B
| $13.3M | 0.01% |
110,700
-800
| -0.7% | -$86.4K |
|
605
CALL
Capri Holdings
CPRI
$1.86B
| $13.3M | 0.01% |
235,200
+16,100
| +7% | +$877K |
|
606
CALL
Marathon Petroleum
MPC
$92.2B
| $13.3M | 0.01% |
216,600
+14,800
| +7% | +$851K |
|
607
PUT
Workhorse Group
WKHS
$30.4M
| $13.2M | 0.01% |
282
+12
| +4% | +$363K |
|
|
DISH
608
CALL
DELISTED
DISH Network Corp.
DISH
| $13.2M | 0.01% |
310,900
+42,200
| +16% | +$1.8M |
|
609
PUT
Macy's
M
$6.4B
| $13.1M | 0.01% |
694,900
+8,200
| +1% | +$164K |
|
610
CALL
ArcelorMittal
MT
$50.1B
| $13.1M | 0.01% |
418,800
-8,200
| -2% | -$268K |
|
|
611
PUT
Capri Holdings
CPRI
$1.86B
| $13M | 0.01% |
229,500
+31,900
| +16% | +$1.74M |
|
612
PUT
Dick's Sporting Goods
DKS
$18.8B
| $13M | 0.01% |
127,900
+4,600
| +4% | +$535K |
|
613
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$108M
| $13M | 0.01% |
322,900
+11,400
| +4% | +$317K |
|
614
PUT
O'Reilly Automotive
ORLY
$71.7B
| $12.9M | 0.01% |
337,500
| – | – |
|
615
PUT
Intellia Therapeutics
NTLA
$1.56B
| $12.9M | 0.01% |
75,200
+8,200
| +12% | +$1.24M |
|
616
CALL
Eaton
ETN
$158B
| $12.9M | 0.01% |
85,700
+3,600
| +4% | +$575K |
|
617
CALL
PagSeguro Digital
PAGS
$2.7B
| $12.8M | 0.01% |
224,400
+400
| +0.2% | +$22.4K |
|
618
CALL
lululemon athletica
LULU
$12.9B
| $12.8M | 0.01% |
35,100
+1,300
| +4% | +$521K |
|
619
PUT
TripAdvisor
TRIP
$1.61B
| $12.7M | 0.01% |
313,800
+100
| +0% | +$3.59K |
|
620
CALL
Honeywell
HON
$73.8B
| $12.7M | 0.01% |
61,114
+1,061
| +2% | +$226K |
|
621
CALL
Simon Property Group
SPG
$73.4B
| $12.7M | 0.01% |
96,400
-3,100
| -3% | -$403K |
|
|
PPLC
622
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $12.6M | 0.01% |
162,600
+5,700
| +4% | +$443K |
|
623
PUT
Microvision
MVIS
$105M
| $12.6M | 0.01% |
769,800
+20,100
| +3% | +$279K |
|
624
Delta Air Lines
DAL
$54.9B
| $12.6M | 0.01% |
283,866
-8,595
| -3% | -$351K |
|
625
CALL
Bank of Montreal
BMO
$125B
| $12.5M | 0.01% |
121,300
+3,500
| +3% | +$352K |
|
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.