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 | |
|---|---|---|---|---|---|---|
2576
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $1.56M | ﹤0.01% |
12,700
+1,800
| +17% | +$225K |
|
2577
Direxion Daily Homebuilders & Supplies Bull 3X ETF
NAIL
$580M
| $1.56M | ﹤0.01% |
14,229
+1,090
| +8% | +$75K |
|
2578
CALL
Grocery Outlet
GO
$891M
| $1.56M | ﹤0.01% |
57,900
+57,600
| +19,200% | +$1.61M |
|
2579
CALL
Autoliv
ALV
$8.6B
| $1.55M | ﹤0.01% |
14,100
-9,100
| -39% | -$906K |
|
2580
CALL
Workiva
WK
$2.94B
| $1.55M | ﹤0.01% |
15,300
| – | – |
|
2581
CALL
Agilon Health
AGL
$1.64B
| $1.55M | ﹤0.01% |
4,944
-452
| -8% | -$164K |
|
2582
CALL
IQVIA
IQV
$34.7B
| $1.55M | ﹤0.01% |
6,700
+3,100
| +86% | +$636K |
|
2583
CALL
Franklin Resources
BEN
$16.9B
| $1.55M | ﹤0.01% |
52,000
-32,000
| -38% | -$796K |
|
2584
CALL
Booz Allen Hamilton
BAH
$8.7B
| $1.55M | ﹤0.01% |
12,100
+8,000
| +195% | +$997K |
|
|
VTLE
2585
PUT
DELISTED
Vital Energy
VTLE
| $1.55M | ﹤0.01% |
34,000
-18,900
| -36% | -$906K |
|
|
SPLK
2586
DELISTED
Splunk Inc
SPLK
| $1.55M | ﹤0.01% |
10,153
-108,509
| -91% | -$16.2M |
|
2587
CALL
Chegg
CHGG
$108M
| $1.54M | ﹤0.01% |
135,800
-310,900
| -70% | -$2.95M |
|
2588
PUT
Neurocrine Biosciences
NBIX
$17.7B
| $1.54M | ﹤0.01% |
11,700
+1,000
| +9% | +$115K |
|
|
FSR
2589
PUT
DELISTED
Fisker Inc.
FSR
| $1.54M | ﹤0.01% |
881,100
+473,500
| +116% | +$1.68M |
|
2590
CALL
First Horizon
FHN
$12.1B
| $1.54M | ﹤0.01% |
108,800
-248,000
| -70% | -$2.99M |
|
2591
PUT
Reliance Steel & Aluminium
RS
$20.8B
| $1.54M | ﹤0.01% |
5,500
+1,000
| +22% | +$266K |
|
2592
CALL
Harmonic Inc
HLIT
$1.21B
| $1.54M | ﹤0.01% |
117,800
+109,600
| +1,337% | +$1.17M |
|
2593
CALL
SouthState Bank Corp
SSB
$10.3B
| $1.54M | ﹤0.01% |
18,200
+5,000
| +38% | +$369K |
|
|
JKS
2594
JinkoSolar
JKS
$775M
| $1.53M | ﹤0.01% |
41,539
+12,785
| +44% | +$412K |
|
2595
CALL
Herc Holdings
HRI
$5.43B
| $1.53M | ﹤0.01% |
10,300
+9,200
| +836% | +$1.13M |
|
2596
Nordic American Tanker
NAT
$1.37B
| $1.53M | ﹤0.01% |
+364,711
| New | +$1.55M |
|
2597
PUT
Rocket Lab Corp
RKLB
$39.9B
| $1.53M | ﹤0.01% |
276,700
+191,900
| +226% | +$867K |
|
2598
CALL
AllianceBernstein
AB
$3.47B
| $1.53M | ﹤0.01% |
49,300
+8,400
| +21% | +$247K |
|
2599
CALL
Valaris
VAL
$5.51B
| $1.53M | ﹤0.01% |
22,300
+5,600
| +34% | +$384K |
|
2600
CALL
AST SpaceMobile
ASTS
$16.8B
| $1.53M | ﹤0.01% |
253,300
+19,000
| +8% | +$82.4K |
|
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.