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 | |
|---|---|---|---|---|---|---|
526
PUT
MongoDB
MDB
$24.5B
| $16.6M | 0.02% |
46,500
+1,700
| +4% | +$685K |
|
527
CALL
Lemonade
LMND
$4.87B
| $16.5M | 0.02% |
146,700
+5,900
| +4% | +$476K |
|
528
PUT
Vipshop
VIPS
$7.05B
| $16.5M | 0.02% |
864,300
-107,200
| -11% | -$1.69M |
|
529
CALL
Royal Bank of Canada
RY
$294B
| $16.3M | 0.02% |
159,900
-9,900
| -6% | -$1.01M |
|
530
CALL
Thermo Fisher Scientific
TMO
$196B
| $16.3M | 0.02% |
32,000
+1,000
| +3% | +$549K |
|
531
CALL
Ulta Beauty
ULTA
$20.8B
| $16.2M | 0.02% |
46,300
+3,300
| +8% | +$1.19M |
|
532
PUT
US Bancorp Series B Preferred Stock
USB.PRH
$747M
| $16.1M | 0.02% |
279,200
+5,400
| +2% | +$135K |
|
533
CALL
Caesars Entertainment
CZR
$6.1B
| $16M | 0.02% |
155,700
-1,500
| -1% | -$147K |
|
534
PUT
Dell
DELL
$285B
| $16M | 0.01% |
319,823
+1,381
| +0.4% | +$68.8K |
|
535
PUT
Domino's
DPZ
$10.6B
| $16M | 0.01% |
34,300
+700
| +2% | +$354K |
|
536
CALL
Petrobras
PBR
$122B
| $15.9M | 0.01% |
1,351,900
-159,100
| -11% | -$1.69M |
|
537
PUT
BioNTech
BNTX
$23.2B
| $15.9M | 0.01% |
71,100
-100
| -0.1% | -$31.8K |
|
538
CALL
Sherwin-Williams
SHW
$78.9B
| $15.9M | 0.01% |
57,800
-3,200
| -5% | -$937K |
|
539
PUT
Analog Devices
ADI
$188B
| $15.9M | 0.01% |
93,900
+300
| +0.3% | +$50.3K |
|
540
PUT
CarMax
KMX
$8.15B
| $15.8M | 0.01% |
120,900
+29,800
| +33% | +$3.97M |
|
541
CALL
Li Auto
LI
$12B
| $15.8M | 0.01% |
454,500
+5,800
| +1% | +$174K |
|
542
Citigroup
C
$222B
| $15.8M | 0.01% |
221,927
+23,891
| +12% | +$1.67M |
|
543
PUT
Cummins
CMI
$91.2B
| $15.7M | 0.01% |
65,000
| – | – |
|
544
PUT
Marathon Petroleum
MPC
$92.2B
| $15.6M | 0.01% |
255,400
+12,300
| +5% | +$707K |
|
545
CALL
Prudential Financial
PRU
$41.3B
| $15.6M | 0.01% |
151,200
+100
| +0.1% | +$10.3K |
|
546
CALL
Humana
HUM
$47.7B
| $15.5M | 0.01% |
34,700
+300
| +0.9% | +$127K |
|
|
FISV
547
CALL
Fiserv Inc
FISV
$26.8B
| $15.5M | 0.01% |
142,800
+4,500
| +3% | +$503K |
|
548
CALL
Lennar Class A
LEN
$19.8B
| $15.4M | 0.01% |
+156,396
| New | +$15.5M |
|
549
CALL
BHP
BHP
$215B
| $15.4M | 0.01% |
238,213
+225
| +0.1% | +$13.7K |
|
550
Boeing
BA
$164B
| $15.3M | 0.01% |
64,018
+18,371
| +40% | +$4.1M |
|
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.