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 | |
|---|---|---|---|---|---|---|
2451
CALL
Rithm Capital
RITM
$5.09B
| $1.26M | ﹤0.01% |
135,900
-30,900
| -19% | -$305K |
|
2452
CALL
Marqeta
MQ
$1.8B
| $1.26M | ﹤0.01% |
52,725
+42,725
| +427% | +$969K |
|
2453
PUT
Welltower
WELL
$178B
| $1.26M | ﹤0.01% |
15,400
-14,700
| -49% | -$1.21M |
|
2454
CALL
ArcBest
ARCB
$3.44B
| $1.26M | ﹤0.01% |
12,400
-6,100
| -33% | -$640K |
|
2455
CALL
Atmos Energy
ATO
$29.9B
| $1.26M | ﹤0.01% |
11,900
+3,500
| +42% | +$408K |
|
2456
CALL
Urban Outfitters
URBN
$5.99B
| $1.26M | ﹤0.01% |
38,500
-5,300
| -12% | -$181K |
|
2457
CALL
Artisan Partners
APAM
$2.79B
| $1.26M | ﹤0.01% |
33,600
+15,000
| +81% | +$582K |
|
2458
CALL
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.9B
| $1.25M | ﹤0.01% |
59,200
+41,600
| +236% | +$999K |
|
2459
CALL
BorgWarner
BWA
$13.2B
| $1.25M | ﹤0.01% |
32,200
-35,051
| -52% | -$1.48M |
|
2460
Under Armour
UAA
$3B
| $1.25M | ﹤0.01% |
+183,177
| New | +$1.38M |
|
2461
PUT
EPAM Systems
EPAM
$4.69B
| $1.25M | ﹤0.01% |
4,900
-11,000
| -69% | -$2.72M |
|
2462
CALL
Valaris
VAL
$5.51B
| $1.25M | ﹤0.01% |
16,700
+12,300
| +280% | +$903K |
|
2463
PUT
Verisk Analytics
VRSK
$26.4B
| $1.25M | ﹤0.01% |
5,300
+4,700
| +783% | +$1.11M |
|
|
NVRO
2464
CALL
DELISTED
NEVRO CORP.
NVRO
| $1.25M | ﹤0.01% |
65,100
+56,600
| +666% | +$1.21M |
|
|
GOOS
2465
CALL
Canada Goose Holdings
GOOS
$868M
| $1.25M | ﹤0.01% |
85,200
-10,500
| -11% | -$171K |
|
2466
CALL
The GEO Group
GEO
$4.13B
| $1.25M | ﹤0.01% |
152,400
-19,900
| -12% | -$146K |
|
2467
CALL
Warrior Met Coal
HCC
$4.23B
| $1.25M | ﹤0.01% |
24,400
-15,800
| -39% | -$663K |
|
|
PLL
2468
PUT
DELISTED
Piedmont Lithium
PLL
| $1.24M | ﹤0.01% |
31,300
+12,600
| +67% | +$612K |
|
2469
CALL
AllianceBernstein
AB
$3.47B
| $1.24M | ﹤0.01% |
40,900
+11,700
| +40% | +$372K |
|
2470
Modine Manufacturing
MOD
$12.8B
| $1.24M | ﹤0.01% |
27,062
+18,168
| +204% | +$762K |
|
2471
PUT
Gartner
IT
$9.41B
| $1.24M | ﹤0.01% |
3,600
+700
| +24% | +$244K |
|
|
IPG
2472
CALL
DELISTED
Interpublic Group of Companies
IPG
| $1.24M | ﹤0.01% |
43,100
+28,000
| +185% | +$934K |
|
2473
PUT
Aurinia Pharmaceuticals
AUPH
$1.97B
| $1.23M | ﹤0.01% |
158,600
-15,000
| -9% | -$147K |
|
2474
PUT
Burford Capital
BUR
$907M
| $1.23M | ﹤0.01% |
87,800
-106,500
| -55% | -$1.45M |
|
2475
CALL
Editas Medicine
EDIT
$399M
| $1.23M | ﹤0.01% |
157,500
-4,600
| -3% | -$39.4K |
|
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.