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 | |
|---|---|---|---|---|---|---|
2976
PUT
Dentsply Sirona
XRAY
$2.59B
| $1.03M | ﹤0.01% |
29,000
+28,900
| +28,900% | +$917K |
|
2977
Yum! Brands
YUM
$41B
| $1.03M | ﹤0.01% |
+7,889
| New | +$985K |
|
2978
CALL
Lennox International
LII
$18.8B
| $1.03M | ﹤0.01% |
2,300
+2,100
| +1,050% | +$838K |
|
|
FLG
2979
PUT
Flagstar Bank National Association
FLG
$5.77B
| $1.03M | ﹤0.01% |
33,533
-25,167
| -43% | -$755K |
|
2980
Avantor
AVTR
$7.81B
| $1.03M | ﹤0.01% |
45,009
-44,545
| -50% | -$913K |
|
2981
CRH
CRH
$66.7B
| $1.02M | ﹤0.01% |
+14,829
| New | +$895K |
|
2982
Transocean
RIG
$5.92B
| $1.02M | ﹤0.01% |
+161,422
| New | +$1.08M |
|
2983
Coeur Mining
CDE
$15.6B
| $1.02M | ﹤0.01% |
314,305
+180,400
| +135% | +$492K |
|
2984
ING
ING
$93.8B
| $1.02M | ﹤0.01% |
68,002
+1,747
| +3% | +$24K |
|
2985
Noble Corp
NE
$6.9B
| $1.02M | ﹤0.01% |
21,208
-13,061
| -38% | -$610K |
|
|
VTNR
2986
CALL
DELISTED
Vertex Energy, Inc
VTNR
| $1.02M | ﹤0.01% |
300,600
+130,100
| +76% | +$511K |
|
2987
PUT
B&G Foods
BGS
$285M
| $1.02M | ﹤0.01% |
96,900
+35,200
| +57% | +$326K |
|
2988
CALL
Littelfuse
LFUS
$10.2B
| $1.02M | ﹤0.01% |
3,800
| – | – |
|
|
2989
CALL
ING
ING
$93.8B
| $1.01M | ﹤0.01% |
67,600
+2,900
| +4% | +$39.8K |
|
2990
PUT
Ginkgo Bioworks
DNA
$481M
| $1.01M | ﹤0.01% |
14,968
+2,695
| +22% | +$165K |
|
2991
CALL
Penske Automotive Group
PAG
$14.3B
| $1.01M | ﹤0.01% |
6,300
-25,200
| -80% | -$3.86M |
|
2992
PUT
Xerox
XRX
$337M
| $1.01M | ﹤0.01% |
55,000
+24,500
| +80% | +$362K |
|
|
PENG
2993
CALL
Penguin Solutions Inc
PENG
$2.76B
| $1.01M | ﹤0.01% |
53,300
+26,700
| +100% | +$462K |
|
|
BZUN
2994
CALL
Baozun
BZUN
$144M
| $1.01M | ﹤0.01% |
367,500
+10,800
| +3% | +$31.8K |
|
2995
CALL
Kulicke & Soffa
KLIC
$5.3B
| $1.01M | ﹤0.01% |
18,400
+12,300
| +202% | +$597K |
|
2996
Trex
TREX
$4.51B
| $1.01M | ﹤0.01% |
+12,158
| New | +$806K |
|
2997
PUT
Mohawk Industries
MHK
$6.9B
| $1M | ﹤0.01% |
9,700
+4,700
| +94% | +$411K |
|
2998
Aehr Test Systems
AEHR
$2.48B
| $1M | ﹤0.01% |
+37,739
| New | +$1.1M |
|
|
2999
CALL
B&G Foods
BGS
$285M
| $1M | ﹤0.01% |
95,300
+200
| +0.2% | +$1.85K |
|
3000
CALL
Black Stone Minerals
BSM
$3.11B
| $1M | ﹤0.01% |
62,700
-5,100
| -8% | -$87.8K |
|
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.