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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
401
PUT
Gilead Sciences
GILD
$162B
| $33.3M | 0.03% |
444,600
+129,600
| +41% | +$9.97M |
|
402
PUT
Cintas
CTAS
$80.6B
| $33.1M | 0.03% |
275,600
+40,000
| +17% | +$4.98M |
|
403
PUT
DoorDash
DASH
$77.4B
| $33.1M | 0.03% |
416,300
-184,700
| -31% | -$15M |
|
404
PUT
Estee Lauder
EL
$29.9B
| $33M | 0.03% |
228,200
+141,100
| +162% | +$23.5M |
|
405
Coinbase
COIN
$43.8B
| $32.9M | 0.03% |
+438,054
| New | +$36.9M |
|
406
CALL
DexCom
DXCM
$27.6B
| $32.9M | 0.03% |
352,200
+135,200
| +62% | +$15.2M |
|
407
PUT
Invesco Aerospace & Defense ETF
PPA
$8.03B
| $32.5M | 0.03% |
235,100
+60,400
| +35% | +$5.05M |
|
408
CALL
Philip Morris
PM
$303B
| $32.5M | 0.03% |
350,900
+117,100
| +50% | +$11.3M |
|
409
CALL
Dollar Tree
DLTR
$23.5B
| $32.4M | 0.03% |
304,400
-88,300
| -22% | -$11.8M |
|
410
PUT
AT&T
T
$160B
| $32.3M | 0.03% |
2,413,900
+7,700
| +0.3% | +$113K |
|
411
CALL
Okta
OKTA
$23.8B
| $32.2M | 0.03% |
394,900
+101,800
| +35% | +$7.72M |
|
412
Oracle
ORCL
$362B
| $32.1M | 0.03% |
303,391
+7,608
| +3% | +$881K |
|
413
CALL
Constellation Brands
STZ
$22.6B
| $32.1M | 0.03% |
127,700
-48,100
| -27% | -$12.6M |
|
414
CALL
Energy Transfer Partners
ET
$70.1B
| $32M | 0.03% |
2,283,400
-76,200
| -3% | -$1.01M |
|
415
CALL
Humana
HUM
$47.7B
| $32M | 0.03% |
65,800
+6,800
| +12% | +$3.2M |
|
416
CALL
Intuitive Surgical
ISRG
$121B
| $31.9M | 0.03% |
109,000
+14,600
| +15% | +$4.56M |
|
|
417
PUT
Constellation Brands
STZ
$22.6B
| $31.7M | 0.02% |
126,200
+52,400
| +71% | +$13.7M |
|
|
AYX
418
CALL
DELISTED
Alteryx Inc
AYX
| $31.5M | 0.02% |
836,400
+672,900
| +412% | +$24.1M |
|
419
CALL
C3.ai
AI
$1.27B
| $31.5M | 0.02% |
1,234,100
-57,200
| -4% | -$1.91M |
|
420
PUT
Trade Desk
TTD
$8.26B
| $31.4M | 0.02% |
401,700
-179,300
| -31% | -$14.5M |
|
421
CALL
ON Semiconductor
ON
$35.9B
| $31.2M | 0.02% |
336,000
+200
| +0.1% | +$19.4K |
|
422
CALL
Fortinet
FTNT
$114B
| $30.7M | 0.02% |
522,600
+288,100
| +123% | +$19.1M |
|
423
CALL
SoFi Technologies
SOFI
$21.9B
| $30.5M | 0.02% |
3,822,200
-180,100
| -4% | -$1.58M |
|
424
JD.com
JD
$40.7B
| $30.3M | 0.02% |
1,040,609
+394,306
| +61% | +$13.7M |
|
425
PUT
NIO
NIO
$11.7B
| $30.3M | 0.02% |
3,350,100
+585,600
| +21% | +$6.52M |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.