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 | |
|---|---|---|---|---|---|---|
1051
Workday
WDAY
$31.6B
| $9.79M | 0.01% |
+40,042
| New | +$9.46M |
|
1052
CALL
CSX Corp
CSX
$97.8B
| $9.76M | 0.01% |
282,700
+54,500
| +24% | +$1.85M |
|
1053
Celsius Holdings
CELH
$6.95B
| $9.73M | 0.01% |
310,192
+3,342
| +1% | +$140K |
|
1054
PUT
AB InBev
BUD
$155B
| $9.7M | 0.01% |
146,300
-246,400
| -63% | -$15.2M |
|
1055
Las Vegas Sands
LVS
$30.5B
| $9.69M | 0.01% |
192,572
+77,978
| +68% | +$3.2M |
|
1056
PUT
Royal Gold
RGLD
$16.9B
| $9.69M | 0.01% |
69,100
+5,400
| +8% | +$739K |
|
1057
PUT
Pan American Silver
PAAS
$18.6B
| $9.67M | 0.01% |
463,600
+93,400
| +25% | +$1.97M |
|
1058
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $9.66M | 0.01% |
416,200
+215,800
| +108% | +$6.14M |
|
1059
CALL
Reddit
RDDT
$32.5B
| $9.66M | 0.01% |
146,600
+11,200
| +8% | +$692K |
|
1060
PUT
Viking Therapeutics
VKTX
$4.11B
| $9.64M | 0.01% |
152,300
-99,100
| -39% | -$5.81M |
|
1061
CALL
Nutrien
NTR
$32.9B
| $9.64M | 0.01% |
200,600
+42,300
| +27% | +$2.04M |
|
1062
Analog Devices
ADI
$185B
| $9.64M | 0.01% |
41,868
+2,799
| +7% | +$631K |
|
1063
PUT
Forward Air
FWRD
$490M
| $9.59M | 0.01% |
271,000
+234,200
| +636% | +$6.65M |
|
1064
CALL
Sarepta Therapeutics
SRPT
$1.68B
| $9.59M | 0.01% |
76,800
-38,100
| -33% | -$5.27M |
|
1065
PUT
Canadian Solar
CSIQ
$997M
| $9.55M | 0.01% |
569,600
+147,700
| +35% | +$2.16M |
|
1066
CALL
Norfolk Southern
NSC
$78.3B
| $9.52M | 0.01% |
38,300
-6,300
| -14% | -$1.51M |
|
1067
PUT
Invesco S&P SmallCap Low Volatility ETF
XSLV
$246M
| $9.48M | 0.01% |
242,800
-205,600
| -46% | -$9.58M |
|
1068
PUT
Invitation Homes
INVH
$17.5B
| $9.47M | 0.01% |
268,500
+106,400
| +66% | +$3.81M |
|
1069
PUT
Dynatrace
DT
$11.8B
| $9.45M | 0.01% |
176,700
-86,900
| -33% | -$4.14M |
|
1070
SiriusXM
SIRI
$10.1B
| $9.45M | 0.01% |
399,428
+336,536
| +535% | +$10.5M |
|
1071
CALL
Alcoa
AA
$11.9B
| $9.43M | 0.01% |
244,500
-490,000
| -67% | -$16.7M |
|
1072
PUT
Mobileye
MBLY
$6.29B
| $9.41M | 0.01% |
686,700
+24,000
| +4% | +$421K |
|
1073
PUT
Noble Corp
NE
$6.88B
| $9.4M | 0.01% |
260,200
+121,300
| +87% | +$4.89M |
|
1074
PUT
Vodafone
VOD
$35.1B
| $9.38M | 0.01% |
936,100
-184,200
| -16% | -$1.76M |
|
1075
Amazon
AMZN
$2.51T
| $9.35M | 0.01% |
50,202
-138,465
| -73% | -$25.3M |
|
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.