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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2976
CALL
Nurix Therapeutics
NRIX
$2.43B
| $874K | ﹤0.01% |
46,400
+44,100
| +1,917% | +$1.01M |
|
2977
CALL
Similarweb
SMWB
$551M
| $874K | ﹤0.01% |
61,700
+59,100
| +2,273% | +$653K |
|
2978
PUT
Cheesecake Factory
CAKE
$4.21B
| $872K | ﹤0.01% |
18,400
-900
| -5% | -$41.4K |
|
|
KLG
2979
PUT
DELISTED
WK Kellogg Co
KLG
| $872K | ﹤0.01% |
48,500
+37,300
| +333% | +$682K |
|
2980
PUT
Legend Biotech
LEGN
$4.3B
| $872K | ﹤0.01% |
26,800
+5,400
| +25% | +$224K |
|
2981
CALL
NCR Voyix
VYX
$1.06B
| $872K | ﹤0.01% |
66,200
+2,400
| +4% | +$33.3K |
|
2982
Atomera
ATOM
$201M
| $871K | ﹤0.01% |
75,165
+48,531
| +182% | +$280K |
|
2983
Fidelity National Financial
FNF
$13.9B
| $871K | ﹤0.01% |
+15,532
| New | +$935K |
|
2984
PUT
Jacobs Solutions
J
$15.9B
| $871K | ﹤0.01% |
8,282
-3,030
| -27% | -$417K |
|
2985
CALL
Vista Energy
VIST
$7.75B
| $871K | ﹤0.01% |
16,100
+2,000
| +14% | +$103K |
|
2986
CALL
Solventum
SOLV
$13.5B
| $871K | ﹤0.01% |
13,200
-18,600
| -58% | -$1.3M |
|
|
WAY
2987
CALL
Waystar Holding Corp
WAY
$4.32B
| $869K | ﹤0.01% |
+23,700
| New | +$729K |
|
2988
Zeta Global
ZETA
$4.77B
| $868K | ﹤0.01% |
48,273
+21,380
| +80% | +$540K |
|
2989
Ascendis Pharma A/S
ASND
$16.7B
| $865K | ﹤0.01% |
6,288
+4,354
| +225% | +$572K |
|
2990
CALL
Amkor Technology
AMKR
$16.1B
| $863K | ﹤0.01% |
33,600
-18,800
| -36% | -$517K |
|
2991
CALL
Commercial Metals
CMC
$7.63B
| $863K | ﹤0.01% |
17,400
-22,100
| -56% | -$1.25M |
|
2992
CALL
Sibanye-Stillwater
SBSW
$5.92B
| $863K | ﹤0.01% |
261,600
-89,700
| -26% | -$377K |
|
|
SHOE
2993
PUT
Shoe Station Group
SHOE
$395M
| $863K | ﹤0.01% |
26,100
+25,900
| +12,950% | +$938K |
|
2994
CALL
Fortive
FTV
$19B
| $862K | ﹤0.01% |
15,261
+8,361
| +121% | +$480K |
|
2995
AdaptHealth
AHCO
$1.46B
| $861K | ﹤0.01% |
+90,502
| New | +$916K |
|
2996
Ardelyx
ARDX
$1.24B
| $861K | ﹤0.01% |
169,863
-70,336
| -29% | -$389K |
|
2997
CALL
Corebridge Financial
CRBG
$14.1B
| $861K | ﹤0.01% |
28,800
-72,400
| -72% | -$2.23M |
|
2998
YieldMax COIN Option Income Strategy ETF
CONY
$321M
| $860K | ﹤0.01% |
6,600
-47
| -0.7% | -$7.07K |
|
2999
PUT
Rapid7
RPD
$634M
| $860K | ﹤0.01% |
21,400
-15,900
| -43% | -$645K |
|
3000
iShares Russell 2000 Value ETF
IWN
$14.4B
| $859K | ﹤0.01% |
5,238
+1,678
| +47% | +$286K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.