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 | |
|---|---|---|---|---|---|---|
376
PUT
Valero Energy
VLO
$92.3B
| $36.3M | 0.03% |
256,400
-48,400
| -16% | -$6.34M |
|
377
PUT
Lennar Class A
LEN
$19.8B
| $36.2M | 0.03% |
333,039
+29,440
| +10% | +$3.45M |
|
378
PUT
Workday
WDAY
$32.7B
| $36M | 0.03% |
181,800
+114,600
| +171% | +$26.6M |
|
379
CALL
Atlassian
TEAM
$21.7B
| $35.9M | 0.03% |
178,100
+10,900
| +7% | +$2.07M |
|
380
Verizon
VZ
$185B
| $35.8M | 0.03% |
1,103,215
+249,148
| +29% | +$8.42M |
|
381
PUT
Halliburton
HAL
$27.6B
| $35.2M | 0.03% |
869,700
+229,900
| +36% | +$9.01M |
|
382
CALL
Analog Devices
ADI
$188B
| $35.1M | 0.03% |
200,400
-65,800
| -25% | -$12.1M |
|
383
PUT
Linde
LIN
$235B
| $35M | 0.03% |
94,100
+38,400
| +69% | +$14.6M |
|
384
PUT
Crocs
CROX
$6.77B
| $34.9M | 0.03% |
395,100
-46,900
| -11% | -$4.82M |
|
|
385
PUT
Atlassian
TEAM
$21.7B
| $34.8M | 0.03% |
172,800
-171,300
| -50% | -$32.5M |
|
386
PUT
Arista Networks
ANET
$220B
| $34.7M | 0.03% |
753,600
+11,200
| +2% | +$499K |
|
387
PUT
EOG Resources
EOG
$76.7B
| $34.5M | 0.03% |
272,200
-82,800
| -23% | -$10.5M |
|
|
388
CALL
Halliburton
HAL
$27.6B
| $34.4M | 0.03% |
849,700
-118,000
| -12% | -$4.62M |
|
389
CALL
AMC Entertainment Holdings
AMC
$2.01B
| $34.2M | 0.03% |
4,285,200
+3,966,680
| +1,245% | +$118M |
|
|
390
CALL
Lennar Class A
LEN
$19.8B
| $34.2M | 0.03% |
314,342
+68,488
| +28% | +$8.03M |
|
391
CALL
NIO
NIO
$11.7B
| $34M | 0.03% |
3,763,800
+42,400
| +1% | +$472K |
|
392
CALL
e.l.f. Beauty
ELF
$4.66B
| $34M | 0.03% |
309,600
+223,200
| +258% | +$27.1M |
|
393
PUT
Philip Morris
PM
$303B
| $33.9M | 0.03% |
366,300
+131,300
| +56% | +$12.6M |
|
394
PUT
ON Semiconductor
ON
$35.9B
| $33.9M | 0.03% |
364,500
-194,000
| -35% | -$18.8M |
|
395
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$432M
| $33.8M | 0.03% |
1,365,900
-555,000
| -29% | -$15.9M |
|
|
396
CALL
Crocs
CROX
$6.77B
| $33.8M | 0.03% |
382,700
+84,600
| +28% | +$8.69M |
|
397
PUT
Cigna
CI
$75.4B
| $33.8M | 0.03% |
118,000
-9,600
| -8% | -$2.74M |
|
398
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $33.7M | 0.03% |
1,658,000
-14,600
| -0.9% | -$740K |
|
399
PUT
Domino's
DPZ
$10.6B
| $33.5M | 0.03% |
88,500
+9,600
| +12% | +$3.69M |
|
400
CALL
lululemon athletica
LULU
$12.9B
| $33.4M | 0.03% |
86,600
-76,500
| -47% | -$29.2M |
|
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.