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 | |
|---|---|---|---|---|---|---|
2926
GE HealthCare
GEHC
$27.6B
| $1.09M | ﹤0.01% |
14,174
-27,163
| -66% | -$1.9M |
|
2927
CALL
NexGen Energy
NXE
$6.05B
| $1.09M | ﹤0.01% |
156,300
+149,900
| +2,342% | +$933K |
|
2928
CALL
Harrow
HROW
$1.43B
| $1.09M | ﹤0.01% |
97,600
+88,300
| +949% | +$1.05M |
|
2929
CALL
Jack in the Box
JACK
$278M
| $1.09M | ﹤0.01% |
13,400
+9,600
| +253% | +$680K |
|
2930
PUT
Ollie's Bargain Outlet
OLLI
$4.01B
| $1.09M | ﹤0.01% |
14,400
-18,500
| -56% | -$1.39M |
|
2931
PUT
Sundial Growers
SNDL
$325M
| $1.09M | ﹤0.01% |
963,300
+85,600
| +10% | +$129K |
|
2932
CALL
Mettler-Toledo International
MTD
$26.8B
| $1.09M | ﹤0.01% |
900
+500
| +125% | +$541K |
|
2933
CALL
Madison Square Garden
MSGS
$9.54B
| $1.09M | ﹤0.01% |
6,000
-3,200
| -35% | -$554K |
|
2934
CALL
Ultragenyx Pharmaceutical
RARE
$2.65B
| $1.09M | ﹤0.01% |
22,800
-23,900
| -51% | -$927K |
|
2935
PUT
Calumet Specialty Products
CLMT
$3.63B
| $1.09M | ﹤0.01% |
60,900
+8,000
| +15% | +$130K |
|
2936
Polaris
PII
$4.15B
| $1.09M | ﹤0.01% |
+11,488
| New | +$1.05M |
|
2937
PUT
Howmet Aerospace
HWM
$116B
| $1.09M | ﹤0.01% |
20,100
+11,400
| +131% | +$562K |
|
2938
CALL
West Fraser Timber
WFG
$5.18B
| $1.09M | ﹤0.01% |
12,700
+12,600
| +12,600% | +$933K |
|
2939
Bumble
BMBL
$367M
| $1.08M | ﹤0.01% |
73,644
+72,751
| +8,147% | +$1.03M |
|
2940
PUT
Evolv Technologies
EVLV
$943M
| $1.08M | ﹤0.01% |
230,000
+7,700
| +3% | +$32.9K |
|
2941
CALL
H&R Block
HRB
$5.18B
| $1.08M | ﹤0.01% |
22,400
-13,400
| -37% | -$597K |
|
2942
PUT
RBC Bearings
RBC
$18.8B
| $1.08M | ﹤0.01% |
3,800
-4,900
| -56% | -$1.2M |
|
2943
CALL
First Trust Nasdaq-100 Select Equal Weight ETF
QQEW
$1.71B
| $1.08M | ﹤0.01% |
+9,200
| New | +$989K |
|
2944
CALL
Cathay General Bancorp
CATY
$4.2B
| $1.07M | ﹤0.01% |
24,100
+1,400
| +6% | +$52.5K |
|
2945
PUT
Box
BOX
$4.02B
| $1.07M | ﹤0.01% |
41,800
+27,100
| +184% | +$685K |
|
2946
Maplebear
CART
$9.92B
| $1.07M | ﹤0.01% |
+45,619
| New | +$1.15M |
|
2947
CALL
Rocket Lab Corp
RKLB
$39.9B
| $1.07M | ﹤0.01% |
193,400
+53,100
| +38% | +$240K |
|
2948
CALL
MoonLake Immunotherapeutics
MLTX
$1.59B
| $1.07M | ﹤0.01% |
17,700
+6,500
| +58% | +$335K |
|
2949
PUT
Marqeta
MQ
$1.8B
| $1.07M | ﹤0.01% |
38,275
-24,350
| -39% | -$583K |
|
2950
Ameren
AEE
$31.5B
| $1.07M | ﹤0.01% |
14,748
+8,028
| +119% | +$611K |
|
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.