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 | |
|---|---|---|---|---|---|---|
2501
PUT
NovoCure
NVCR
$2.04B
| $1.2M | ﹤0.01% |
74,300
+56,800
| +325% | +$1.64M |
|
|
SPWR
2502
PUT
DELISTED
SunPower Corporation Common Stock
SPWR
| $1.2M | ﹤0.01% |
194,400
-55,800
| -22% | -$460K |
|
2503
CALL
Allison Transmission
ALSN
$10.1B
| $1.2M | ﹤0.01% |
+20,300
| New | +$1.2M |
|
2504
CALL
Frontline
FRO
$8.75B
| $1.2M | ﹤0.01% |
63,800
+35,200
| +123% | +$592K |
|
2505
CALL
Republic Services
RSG
$66.7B
| $1.2M | ﹤0.01% |
8,400
-1,300
| -13% | -$193K |
|
2506
CALL
Fulgent Genetics
FLGT
$559M
| $1.2M | ﹤0.01% |
44,700
+40,900
| +1,076% | +$1.4M |
|
2507
Natural Resource Partners
NRP
$1.3B
| $1.19M | ﹤0.01% |
+15,141
| New | +$983K |
|
|
SBOW
2508
PUT
DELISTED
SilverBow Resources, Inc.
SBOW
| $1.19M | ﹤0.01% |
33,300
-11,800
| -26% | -$430K |
|
|
GOGL
2509
PUT
DELISTED
Golden Ocean Group
GOGL
| $1.18M | ﹤0.01% |
150,300
+140,200
| +1,388% | +$1.05M |
|
2510
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $1.18M | ﹤0.01% |
4,500
+1,000
| +29% | +$277K |
|
2511
PUT
Starwood Property Trust
STWD
$6.12B
| $1.18M | ﹤0.01% |
60,900
-372,700
| -86% | -$7.56M |
|
2512
PUT
Navios Maritime Partners
NMM
$2.25B
| $1.18M | ﹤0.01% |
50,900
-44,500
| -47% | -$1.02M |
|
2513
Ally Financial
ALLY
$13.1B
| $1.18M | ﹤0.01% |
44,066
+18,960
| +76% | +$529K |
|
2514
PUT
Trupanion
TRUP
$1.05B
| $1.17M | ﹤0.01% |
41,600
-92,700
| -69% | -$2.63M |
|
2515
PUT
RingCentral
RNG
$4.05B
| $1.17M | ﹤0.01% |
39,500
-33,500
| -46% | -$1.11M |
|
2516
CALL
Black Stone Minerals
BSM
$3.11B
| $1.17M | ﹤0.01% |
67,800
-37,400
| -36% | -$638K |
|
2517
CubeSmart
CUBE
$9.53B
| $1.17M | ﹤0.01% |
30,596
+20,317
| +198% | +$857K |
|
2518
CALL
New York Times
NYT
$11.6B
| $1.17M | ﹤0.01% |
28,300
-15,600
| -36% | -$656K |
|
2519
QuidelOrtho
QDEL
$1.09B
| $1.16M | ﹤0.01% |
+15,946
| New | +$1.27M |
|
|
AD
2520
PUT
Array Digital Infrastructure
AD
$3.02B
| $1.16M | ﹤0.01% |
27,100
+25,800
| +1,985% | +$836K |
|
|
EGLE
2521
PUT
DELISTED
Eagle Bulk Shipping Inc.
EGLE
| $1.16M | ﹤0.01% |
27,700
+2,500
| +10% | +$110K |
|
2522
PUT
Roper Technologies
ROP
$36.3B
| $1.16M | ﹤0.01% |
2,400
-1,900
| -44% | -$931K |
|
2523
PUT
Agilon Health
AGL
$1.64B
| $1.16M | ﹤0.01% |
2,616
+1,152
| +79% | +$520K |
|
2524
IQVIA
IQV
$34.7B
| $1.16M | ﹤0.01% |
+5,901
| New | +$1.28M |
|
2525
PUT
Vicor
VICR
$9.62B
| $1.16M | ﹤0.01% |
19,700
+15,300
| +348% | +$1.01M |
|
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.