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 | |
|---|---|---|---|---|---|---|
|
PARA
1026
PUT
DELISTED
Paramount Global Class B
PARA
| $10.1M | 0.01% |
949,000
-542,100
| -36% | -$5.9M |
|
1027
CALL
GitLab
GTLB
$5.1B
| $10M | 0.01% |
194,500
-31,800
| -14% | -$1.59M |
|
1028
CALL
BCE
BCE
$19.8B
| $10M | 0.01% |
287,500
-241,500
| -46% | -$8.25M |
|
1029
Iris Energy
IREN
$14.5B
| $10M | 0.01% |
1,185,323
+177,192
| +18% | +$1.63M |
|
1030
PUT
PG&E
PCG
$47B
| $9.99M | 0.01% |
505,200
-1,315,700
| -72% | -$24.6M |
|
1031
CALL
Galicia Financial Group
GGAL
$8.06B
| $9.97M | 0.01% |
237,000
+144,000
| +155% | +$5.01M |
|
1032
PUT
GraniteShares Bloomberg Commodity Broad Strategy No K-1 ETF
COMB
$136M
| $9.96M | 0.01% |
213,800
+51,600
| +32% | +$1.02M |
|
1033
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$107M
| $9.96M | 0.01% |
348,100
+207,600
| +148% | +$5.19M |
|
1034
CALL
Trump Media & Technology Group
DJT
$2.46B
| $9.95M | 0.01% |
619,000
+207,700
| +50% | +$5.03M |
|
1035
PUT
Boston Properties
BXP
$10.8B
| $9.94M | 0.01% |
123,600
-122,800
| -50% | -$8.79M |
|
|
FLNA
1036
PUT
Filana Therapeutics
FLNA
$45M
| $9.94M | 0.01% |
337,900
+238,400
| +240% | +$5.49M |
|
|
UCD
1037
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $9.92M | 0.01% |
263,100
+62,300
| +31% | +$2.35M |
|
1038
PUT
Fair Isaac
FICO
$28B
| $9.91M | 0.01% |
5,100
-5,300
| -51% | -$9.07M |
|
1039
CALL
Vanguard FTSE Europe ETF
VGK
$29.8B
| $9.9M | 0.01% |
156,100
+23,000
| +17% | +$1.58M |
|
1040
PUT
Kimberly-Clark
KMB
$35.6B
| $9.9M | 0.01% |
69,600
-42,400
| -38% | -$6.01M |
|
1041
SoFi Technologies
SOFI
$21.4B
| $9.89M | 0.01% |
1,257,779
-560,019
| -31% | -$4.07M |
|
1042
PUT
Progressive
PGR
$120B
| $9.87M | 0.01% |
38,900
-10,900
| -22% | -$2.53M |
|
1043
CALL
Interactive Brokers
IBKR
$40.9B
| $9.87M | 0.01% |
283,200
+28,800
| +11% | +$892K |
|
1044
CALL
Cogent Communications
CCOI
$646M
| $9.86M | 0.01% |
129,900
+59,700
| +85% | +$4.11M |
|
1045
CALL
Lucid Motors
LCID
$2.52B
| $9.86M | 0.01% |
279,310
+60,880
| +28% | +$2.12M |
|
1046
CALL
The GEO Group
GEO
$4.15B
| $9.84M | 0.01% |
766,000
+256,100
| +50% | +$3.57M |
|
|
SHNY
1047
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $9.84M | 0.01% |
1,245,500
-28,500
| -2% | -$225K |
|
1048
CALL
Fastenal
FAST
$53B
| $9.81M | 0.01% |
274,800
-30,600
| -10% | -$1.04M |
|
1049
CALL
Enbridge
ENB
$123B
| $9.81M | 0.01% |
241,600
+40,500
| +20% | +$1.56M |
|
1050
PUT
Phillips 66
PSX
$83B
| $9.81M | 0.01% |
74,600
-49,600
| -40% | -$6.7M |
|
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.