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 | |
|---|---|---|---|---|---|---|
3651
Hallador Energy
HNRG
$717M
| $472K | ﹤0.01% |
50,118
+19,243
| +62% | +$137K |
|
3652
CALL
CGI
GIB
$14.5B
| $471K | ﹤0.01% |
4,100
-1,900
| -32% | -$208K |
|
3653
CALL
Progress Software
PRGS
$1.59B
| $471K | ﹤0.01% |
7,000
+2,400
| +52% | +$137K |
|
3654
Simpson Manufacturing
SSD
$7.95B
| $471K | ﹤0.01% |
2,463
+1,790
| +266% | +$321K |
|
3655
PUT
TPG
TPG
$6.89B
| $471K | ﹤0.01% |
8,200
-29,900
| -78% | -$1.47M |
|
3656
CALL
Immunocore
IMCR
$1.72B
| $470K | ﹤0.01% |
15,100
| – | – |
|
3657
PUT
Markel Group
MKL
$25.2B
| $470K | ﹤0.01% |
300
-1,800
| -86% | -$2.82M |
|
3658
CALL
Mercury Systems
MRCY
$6.23B
| $469K | ﹤0.01% |
12,700
+900
| +8% | +$31.7K |
|
3659
PUT
Appian
APPN
$1.88B
| $467K | ﹤0.01% |
13,700
-110,300
| -89% | -$3.57M |
|
3660
Corsair Gaming
CRSR
$1.13B
| $467K | ﹤0.01% |
67,235
+50,213
| +295% | +$375K |
|
3661
CALL
Achieve Life Sciences
ACHV
$634M
| $466K | ﹤0.01% |
98,400
+38,100
| +63% | +$174K |
|
3662
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.71B
| $466K | ﹤0.01% |
8,686
+6,411
| +282% | +$334K |
|
3663
PUT
St. Joe Company
JOE
$3.56B
| $466K | ﹤0.01% |
8,000
-41,000
| -84% | -$2.4M |
|
3664
PUT
SLM Corp
SLM
$4.78B
| $466K | ﹤0.01% |
20,400
+12,400
| +155% | +$267K |
|
|
BECN
3665
PUT
DELISTED
Beacon Roofing Supply, Inc.
BECN
| $466K | ﹤0.01% |
5,400
+300
| +6% | +$26.7K |
|
3666
CALL
WD-40
WDFC
$3.13B
| $464K | ﹤0.01% |
1,800
-9,900
| -85% | -$2.48M |
|
3667
PUT
Energizer
ENR
$1.44B
| $463K | ﹤0.01% |
14,600
-3,200
| -18% | -$96.3K |
|
3668
PUT
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.7M
| $463K | ﹤0.01% |
+3,600
| New | +$450K |
|
3669
CALL
VinFast Auto
VFS
$6.9B
| $463K | ﹤0.01% |
121,300
+39,200
| +48% | +$155K |
|
|
CIM
3670
PUT
Chimera Investment
CIM
$1.05B
| $462K | ﹤0.01% |
29,200
+5,500
| +23% | +$82.4K |
|
3671
CALL
i3 Verticals
IIIV
$404M
| $462K | ﹤0.01% |
21,700
+14,500
| +201% | +$325K |
|
3672
PUT
M/I Homes
MHO
$3.81B
| $462K | ﹤0.01% |
2,700
+1,000
| +59% | +$152K |
|
3673
PUT
Sinclair Inc
SBGI
$974M
| $462K | ﹤0.01% |
30,200
+7,300
| +32% | +$102K |
|
3674
Illinois Tool Works
ITW
$81.9B
| $461K | ﹤0.01% |
+1,762
| New | +$434K |
|
3675
CALL
WEX
WEX
$6.07B
| $461K | ﹤0.01% |
2,200
-1,700
| -44% | -$317K |
|
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.