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 |
Boeing
BA
|
+$55.8M |
| 2 |
Microsoft
MSFT
|
+$42.2M |
| 3 |
Pinduoduo
PDD
|
+$41.3M |
| 4 |
Apple
AAPL
|
+$32M |
| 5 |
Direxion Daily Semiconductor Bull 3X ETF
SOXL
|
+$28.3M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Broadcom
AVGO
|
+$95.2M |
| 2 |
Citigroup
C
|
+$57.2M |
| 3 |
Pfizer
PFE
|
+$56.4M |
| 4 |
TSMC
TSM
|
+$39.7M |
| 5 |
Starbucks
SBUX
|
+$35.5M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.4% |
| 2 | Consumer Discretionary | 0.29% |
| 3 | Healthcare | 0.15% |
| 4 | Industrials | 0.13% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1726
Caesars Entertainment
CZR
$6.1B
| $3.71M | ﹤0.01% |
88,979
+25,005
| +39% | +$938K |
|
1727
Maplebear
CART
$9.92B
| $3.71M | ﹤0.01% |
91,132
+38,481
| +73% | +$1.35M |
|
1728
CALL
Joby Aviation
JOBY
$6.82B
| $3.71M | ﹤0.01% |
738,100
+232,500
| +46% | +$1.26M |
|
1729
PUT
Elanco Animal Health
ELAN
$12.4B
| $3.71M | ﹤0.01% |
252,400
+143,100
| +131% | +$1.99M |
|
1730
CALL
Tilray
TLRY
$479M
| $3.7M | ﹤0.01% |
210,430
-26,000
| -11% | -$468K |
|
1731
CALL
Box
BOX
$4.02B
| $3.7M | ﹤0.01% |
113,100
+45,300
| +67% | +$1.32M |
|
1732
CALL
ICICI Bank
IBN
$106B
| $3.69M | ﹤0.01% |
123,800
-21,700
| -15% | -$632K |
|
1733
CALL
United Therapeutics
UTHR
$26.3B
| $3.69M | ﹤0.01% |
10,300
-4,300
| -29% | -$1.45M |
|
1734
PUT
Ambarella
AMBA
$2.99B
| $3.69M | ﹤0.01% |
65,400
+26,300
| +67% | +$1.4M |
|
1735
XPO
XPO
$25B
| $3.69M | ﹤0.01% |
34,312
+2,989
| +10% | +$335K |
|
1736
CALL
Natural Resource Partners
NRP
$1.3B
| $3.69M | ﹤0.01% |
37,700
+20,100
| +114% | +$1.84M |
|
1737
Truist Financial
TFC
$63.2B
| $3.68M | ﹤0.01% |
86,033
-42,998
| -33% | -$1.82M |
|
1738
CALL
Archer Aviation
ACHR
$3.64B
| $3.68M | ﹤0.01% |
1,214,100
-347,300
| -22% | -$1.33M |
|
1739
PUT
HDFC Bank
HDB
$119B
| $3.68M | ﹤0.01% |
117,600
-78,200
| -40% | -$2.4M |
|
1740
CALL
Stride
LRN
$3.69B
| $3.67M | ﹤0.01% |
43,000
+20,400
| +90% | +$1.58M |
|
1741
PUT
WillScot Mobile Mini Holdings
WSC
$4.8B
| $3.67M | ﹤0.01% |
97,500
-17,200
| -15% | -$656K |
|
1742
CALL
Wolfspeed
WOLF
$1.2B
| $3.66M | ﹤0.01% |
377,700
+200,200
| +113% | +$2.95M |
|
|
PARA
1743
DELISTED
Paramount Global Class B
PARA
| $3.66M | ﹤0.01% |
344,892
-591,418
| -63% | -$6.43M |
|
1744
PUT
Vanguard S&P 500 Growth ETF
VOOG
$25.4B
| $3.66M | ﹤0.01% |
63,600
+49,200
| +342% | +$2.73M |
|
1745
PUT
Acadia Healthcare
ACHC
$3.17B
| $3.66M | ﹤0.01% |
57,700
+54,400
| +1,648% | +$3.93M |
|
|
ACB
1746
CALL
Aurora Cannabis
ACB
$165M
| $3.65M | ﹤0.01% |
621,200
-60,000
| -9% | -$355K |
|
1747
Astera Labs
ALAB
$50B
| $3.65M | ﹤0.01% |
+69,670
| New | +$3.27M |
|
1748
PUT
Douglas Emmett
DEI
$2.06B
| $3.64M | ﹤0.01% |
207,400
+90,500
| +77% | +$1.4M |
|
1749
Enphase Energy
ENPH
$4.84B
| $3.64M | ﹤0.01% |
+32,231
| New | +$3.6M |
|
1750
PUT
Illinois Tool Works
ITW
$81.4B
| $3.64M | ﹤0.01% |
13,900
+7,400
| +114% | +$1.82M |
|
Similar funds
Simplex Trading's Q3 2024 Portfolio in Review
As of Q3 2024, Simplex Trading held 9,964 positions worth $170B, up 5.3% from $162B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q3 2024 filing shows 1,185 new, 3,232 increased, 3,829 reduced and 1,476 closed positions. Its largest new stake was Boeing: 325,328 shares worth $49.5M. The largest sale was Broadcom, an estimated $95.2M.
By sector, the portfolio is most concentrated in Technology at 0.4% of assets, down from 0.53% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2024 buy was Boeing: 325,328 shares worth $49.5M.
- Simplex Trading added most to Pinduoduo in Q3 2024, an estimated $41.3M increase.
- Simplex Trading's biggest Q3 2024 reduction was Citigroup, cutting an estimated $57.2M.
- Simplex Trading fully exited Broadcom in Q3 2024, selling an estimated $95.2M.
- Simplex Trading's ten largest holdings make up 50% of its $170B portfolio in Q3 2024.
- Simplex Trading opened 1,185 new positions and closed 1,476 in Q3 2024.
- Simplex Trading's portfolio value rose 5.3% quarter-over-quarter to $170B.
Based on Simplex Trading's 13F filing for Q3 2024, filed 8 Nov 2024.