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 | |
|---|---|---|---|---|---|---|
4026
Pacira BioSciences
PCRX
$1.05B
| $312K | ﹤0.01% |
+16,592
| New | +$291K |
|
4027
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $312K | ﹤0.01% |
7,400
+3,000
| +68% | +$150K |
|
|
ZK
4028
CALL
DELISTED
Zeekr
ZK
| $312K | ﹤0.01% |
11,000
-1,600
| -13% | -$40.7K |
|
4029
CALL
Kinetik
KNTK
$3.64B
| $311K | ﹤0.01% |
5,500
-7,400
| -57% | -$400K |
|
4030
PUT
SFL Corp
SFL
$1.61B
| $311K | ﹤0.01% |
30,500
+11,000
| +56% | +$117K |
|
4031
CALL
Valley National Bancorp
VLY
$8.01B
| $311K | ﹤0.01% |
34,400
-118,900
| -78% | -$1.15M |
|
4032
W.R. Berkley
WRB
$28.3B
| $311K | ﹤0.01% |
+5,331
| New | +$319K |
|
4033
CALL
Azenta
AZTA
$1.33B
| $310K | ﹤0.01% |
6,200
-2,300
| -27% | -$105K |
|
|
MCW
4034
PUT
DELISTED
Mister Car Wash
MCW
| $310K | ﹤0.01% |
42,600
+42,400
| +21,200% | +$310K |
|
4035
PUT
Algoma Steel
ASTL
$463M
| $309K | ﹤0.01% |
31,600
-47,900
| -60% | -$494K |
|
4036
MINISO
MNSO
$3.73B
| $309K | ﹤0.01% |
12,954
-5,301
| -29% | -$107K |
|
4037
BRC Group Holdings
RILY
$270M
| $309K | ﹤0.01% |
+67,475
| New | +$352K |
|
4038
CALL
WisdomTree
WT
$2.97B
| $309K | ﹤0.01% |
29,500
+27,500
| +1,375% | +$298K |
|
4039
PUT
Arrowhead Research
ARWR
$12.1B
| $308K | ﹤0.01% |
16,400
+300
| +2% | +$6.18K |
|
4040
Digimarc Corp
DMRC
$145M
| $307K | ﹤0.01% |
8,222
-5,635
| -41% | -$184K |
|
4041
GraniteShares ETF Trust GraniteShares 2x Long META Daily ETF
FBL
$176M
| $307K | ﹤0.01% |
9,325
+8,418
| +928% | +$284K |
|
4042
International Seaways
INSW
$4.63B
| $307K | ﹤0.01% |
+8,565
| New | +$364K |
|
|
SWTX
4043
CALL
DELISTED
SpringWorks Therapeutics
SWTX
| $307K | ﹤0.01% |
8,500
+1,400
| +20% | +$48.9K |
|
4044
THOR Low Volatility ETF
THLV
$57.8M
| $307K | ﹤0.01% |
+11,168
| New | +$321K |
|
|
AISP
4045
PUT
Airship AI Holdings
AISP
$66.5M
| $306K | ﹤0.01% |
48,900
+48,400
| +9,680% | +$142K |
|
|
4046
Arrowhead Research
ARWR
$12.1B
| $306K | ﹤0.01% |
16,307
+2,833
| +21% | +$58.3K |
|
4047
PUT
Nokia
NOK
$49.9B
| $305K | ﹤0.01% |
69,000
-25,600
| -27% | -$114K |
|
|
NUVL
4048
CALL
DELISTED
Nuvalent
NUVL
| $305K | ﹤0.01% |
3,900
+500
| +15% | +$46.7K |
|
4049
WPP
WPP
$4.59B
| $305K | ﹤0.01% |
+5,937
| New | +$314K |
|
|
JOYY
4050
CALL
JOYY Inc
JOYY
$3.77B
| $305K | ﹤0.01% |
7,300
+2,900
| +66% | +$107K |
|
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.