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 | |
|---|---|---|---|---|---|---|
|
KFYP
476
PUT
DELISTED
KraneShares CICC China Leaders 100 Index ETF
KFYP
| $19M | 0.02% |
304,000
+29,300
| +11% | +$927K |
|
477
CALL
Marvell Technology
MRVL
$189B
| $19M | 0.02% |
331,700
+6,700
| +2% | +$402K |
|
478
CALL
Nokia
NOK
$57.4B
| $18.9M | 0.02% |
3,526,600
+166,000
| +5% | +$964K |
|
479
PUT
Alcoa
AA
$12.2B
| $18.9M | 0.02% |
510,100
+13,300
| +3% | +$562K |
|
480
CALL
Regeneron Pharmaceuticals
REGN
$68.3B
| $18.8M | 0.02% |
32,800
+3,100
| +10% | +$1.92M |
|
481
CALL
Newmont
NEM
$102B
| $18.8M | 0.02% |
321,900
-10,600
| -3% | -$625K |
|
482
VanEck Semiconductor ETF
SMH
$70.7B
| $18.8M | 0.02% |
145,356
-196
| -0.1% | -$25.8K |
|
483
CALL
Analog Devices
ADI
$188B
| $18.7M | 0.02% |
110,300
+100
| +0.1% | +$16.8K |
|
484
Mastercard
MA
$470B
| $18.6M | 0.02% |
50,302
+8,775
| +21% | +$3.19M |
|
485
PUT
Fiverr
FVRR
$377M
| $18.6M | 0.02% |
77,600
+3,900
| +5% | +$786K |
|
486
PUT
DexCom
DXCM
$27.6B
| $18.6M | 0.02% |
174,400
-3,600
| -2% | -$454K |
|
487
Strategy Inc
MSTR
$36.3B
| $18.3M | 0.02% |
281,790
+1,990
| +0.7% | +$128K |
|
488
CALL
SLB Ltd
SLB
$71.3B
| $18.3M | 0.02% |
553,800
+12,900
| +2% | +$370K |
|
|
PXD
489
PUT
DELISTED
Pioneer Natural Resource Co.
PXD
| $18.2M | 0.02% |
109,000
+1,700
| +2% | +$257K |
|
490
NIO
NIO
$11.7B
| $18.2M | 0.02% |
357,931
+150,539
| +73% | +$6.18M |
|
|
WBA
491
PUT
DELISTED
Walgreens Boots Alliance
WBA
| $18.1M | 0.02% |
371,800
+52,400
| +16% | +$2.53M |
|
492
PUT
Hilton Worldwide
HLT
$73.8B
| $17.9M | 0.02% |
145,100
-600
| -0.4% | -$75.8K |
|
493
CALL
RH
RH
$3.31B
| $17.9M | 0.02% |
25,900
+200
| +0.8% | +$138K |
|
|
BBBY
494
CALL
DELISTED
Bed Bath & Beyond Inc
BBBY
| $17.8M | 0.02% |
546,800
+41,100
| +8% | +$1.11M |
|
495
CALL
Autodesk
ADSK
$43B
| $17.8M | 0.02% |
60,600
+900
| +2% | +$275K |
|
496
PUT
AB InBev
BUD
$161B
| $17.7M | 0.02% |
245,500
+9,900
| +4% | +$621K |
|
|
IPFF
497
PUT
DELISTED
iShares International Preferred Stock ETF
IPFF
| $17.6M | 0.02% |
334,700
+8,100
| +2% | +$136K |
|
498
CALL
DuPont de Nemours
DD
$18.9B
| $17.6M | 0.02% |
178,852
-876
| -0.5% | -$81.2K |
|
499
Futu Holdings
FUTU
$14.9B
| $17.5M | 0.02% |
108,657
+50
| +0% | +$5.52K |
|
500
PUT
Fortinet
FTNT
$114B
| $17.5M | 0.02% |
361,000
| – | – |
|
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.