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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2501
PUT
Sibanye-Stillwater
SBSW
$5.92B
| $1.69M | ﹤0.01% |
311,500
-20,200
| -6% | -$104K |
|
|
JBTM
2502
CALL
JBT Marel
JBTM
$7.14B
| $1.69M | ﹤0.01% |
17,000
+16,400
| +2,733% | +$1.7M |
|
2503
Ferrari
RACE
$63.3B
| $1.69M | ﹤0.01% |
4,991
+3,467
| +227% | +$1.16M |
|
2504
PUT
Applied Optoelectronics
AAOI
$8.04B
| $1.68M | ﹤0.01% |
87,200
-12,800
| -13% | -$167K |
|
|
2505
Sibanye-Stillwater
SBSW
$5.92B
| $1.68M | ﹤0.01% |
309,868
-26,136
| -8% | -$135K |
|
2506
CALL
Trane Technologies
TT
$106B
| $1.68M | ﹤0.01% |
6,900
-3,700
| -35% | -$809K |
|
2507
Rapid7
RPD
$634M
| $1.68M | ﹤0.01% |
+29,435
| New | +$1.54M |
|
2508
Sprott Junior Uranium Miners ETF
URNJ
$306M
| $1.68M | ﹤0.01% |
71,112
-18,384
| -21% | -$429K |
|
2509
PUT
Rockwell Automation
ROK
$51.4B
| $1.68M | ﹤0.01% |
5,400
-25,400
| -82% | -$7.12M |
|
2510
PUT
Procept Biorobotics
PRCT
$950M
| $1.67M | ﹤0.01% |
39,900
+34,200
| +600% | +$1.16M |
|
|
GOGL
2511
PUT
DELISTED
Golden Ocean Group
GOGL
| $1.67M | ﹤0.01% |
171,300
+21,000
| +14% | +$175K |
|
2512
PUT
Warrior Met Coal
HCC
$4.23B
| $1.67M | ﹤0.01% |
27,400
+6,000
| +28% | +$317K |
|
2513
CALL
Viatris
VTRS
$20.1B
| $1.67M | ﹤0.01% |
154,000
+29,500
| +24% | +$282K |
|
|
LNW
2514
CALL
DELISTED
Light & Wonder
LNW
| $1.67M | ﹤0.01% |
20,300
+3,400
| +20% | +$273K |
|
|
2515
PUT
Viatris
VTRS
$20.1B
| $1.67M | ﹤0.01% |
153,900
-19,700
| -11% | -$189K |
|
2516
iShares US Home Construction ETF
ITB
$2.41B
| $1.66M | ﹤0.01% |
16,355
+15,194
| +1,309% | +$1.29M |
|
2517
Arcus Biosciences
RCUS
$3.57B
| $1.66M | ﹤0.01% |
87,084
+2,291
| +3% | +$36.6K |
|
2518
PUT
Wabtec
WAB
$51.1B
| $1.66M | ﹤0.01% |
13,100
+12,800
| +4,267% | +$1.44M |
|
2519
PUT
Getty Images
GETY
$184M
| $1.66M | ﹤0.01% |
316,400
+198,100
| +167% | +$994K |
|
2520
CALL
Madison Square Garden
MSGE
$3.61B
| $1.66M | ﹤0.01% |
52,200
+47,900
| +1,114% | +$1.49M |
|
2521
CALL
Avery Dennison
AVY
$12.3B
| $1.66M | ﹤0.01% |
8,200
+3,400
| +71% | +$635K |
|
2522
CALL
GXO Logistics
GXO
$6.06B
| $1.66M | ﹤0.01% |
27,100
+19,100
| +239% | +$1.07M |
|
2523
Axsome Therapeutics
AXSM
$12.4B
| $1.66M | ﹤0.01% |
20,813
+13,267
| +176% | +$887K |
|
2524
Mativ Holdings
MATV
$448M
| $1.66M | ﹤0.01% |
108,127
+59,003
| +120% | +$797K |
|
2525
CALL
Silicon Laboratories
SLAB
$7.15B
| $1.65M | ﹤0.01% |
12,500
-102,200
| -89% | -$11.2M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.