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 | |
|---|---|---|---|---|---|---|
1701
CALL
Elanco Animal Health
ELAN
$12.4B
| $4.28M | ﹤0.01% |
287,100
+244,900
| +580% | +$2.77M |
|
1702
PUT
Wheaton Precious Metals
WPM
$50.6B
| $4.27M | ﹤0.01% |
86,600
-37,600
| -30% | -$1.7M |
|
1703
PUT
monday.com
MNDY
$3.27B
| $4.26M | ﹤0.01% |
22,700
-29,600
| -57% | -$4.77M |
|
1704
CALL
TAL Education Group
TAL
$5.71B
| $4.26M | ﹤0.01% |
337,400
+131,600
| +64% | +$1.36M |
|
1705
CALL
Amphenol
APH
$188B
| $4.25M | ﹤0.01% |
85,800
+58,600
| +215% | +$2.59M |
|
1706
PUT
Teradyne
TER
$54.8B
| $4.23M | ﹤0.01% |
39,000
-9,300
| -19% | -$882K |
|
1707
PUT
Kinross Gold
KGC
$28.5B
| $4.23M | ﹤0.01% |
699,200
-108,900
| -13% | -$595K |
|
1708
PUT
Elbit Systems
ESLT
$38.4B
| $4.22M | ﹤0.01% |
19,800
-4,200
| -18% | -$848K |
|
1709
FMC
FMC
$1.42B
| $4.22M | ﹤0.01% |
66,959
+21,781
| +48% | +$1.26M |
|
1710
Coca-Cola
KO
$354B
| $4.22M | ﹤0.01% |
71,584
+31,508
| +79% | +$1.79M |
|
1711
CALL
Urban Outfitters
URBN
$5.99B
| $4.21M | ﹤0.01% |
118,000
+79,500
| +206% | +$2.77M |
|
|
NVMI
1712
CALL
Nova
NVMI
$13.9B
| $4.2M | ﹤0.01% |
30,600
+24,700
| +419% | +$2.85M |
|
1713
CALL
Tidewater
TDW
$3.91B
| $4.2M | ﹤0.01% |
58,200
+24,400
| +72% | +$1.58M |
|
1714
PUT
Macerich
MAC
$7.32B
| $4.19M | ﹤0.01% |
271,800
+134,100
| +97% | +$1.6M |
|
1715
Strategy Inc
MSTR
$33.5B
| $4.19M | ﹤0.01% |
66,320
-288,190
| -81% | -$13.7M |
|
1716
PUT
Skywest
SKYW
$4.11B
| $4.19M | ﹤0.01% |
80,200
+10,900
| +16% | +$490K |
|
1717
PUT
MoonLake Immunotherapeutics
MLTX
$1.59B
| $4.18M | ﹤0.01% |
69,200
+54,100
| +358% | +$2.79M |
|
|
CBAY
1718
CALL
DELISTED
Cymabay Therapeutics
CBAY
| $4.18M | ﹤0.01% |
176,900
+116,300
| +192% | +$2.07M |
|
|
IMGN
1719
PUT
DELISTED
Immunogen Inc
IMGN
| $4.17M | ﹤0.01% |
140,700
-39,500
| -22% | -$787K |
|
|
SEE
1720
CALL
DELISTED
Sealed Air
SEE
| $4.17M | ﹤0.01% |
114,100
-24,200
| -17% | -$793K |
|
1721
American Eagle Outfitters
AEO
$2.85B
| $4.15M | ﹤0.01% |
196,357
+43,986
| +29% | +$820K |
|
1722
Chubb
CB
$140B
| $4.15M | ﹤0.01% |
+18,348
| New | +$4.01M |
|
1723
LyondellBasell Industries
LYB
$19.5B
| $4.14M | ﹤0.01% |
43,559
+43,246
| +13,817% | +$4.04M |
|
1724
CALL
New Oriental
EDU
$7.84B
| $4.14M | ﹤0.01% |
67,800
-35,200
| -34% | -$2.44M |
|
1725
PUT
Innovative Industrial Properties
IIPR
$1.78B
| $4.13M | ﹤0.01% |
41,000
+10,200
| +33% | +$836K |
|
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.