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 | |
|---|---|---|---|---|---|---|
4651
PUT
Cabot Corp
CBT
$4.72B
| $173K | ﹤0.01% |
1,900
+700
| +58% | +$75.2K |
|
4652
CALL
Ferguson
FERG
$43.9B
| $173K | ﹤0.01% |
1,000
-22,200
| -96% | -$4.41M |
|
4653
CALL
Ingles Markets
IMKTA
$1.72B
| $173K | ﹤0.01% |
+2,700
| New | +$182K |
|
4654
CALL
MoonLake Immunotherapeutics
MLTX
$1.56B
| $173K | ﹤0.01% |
3,200
+1,400
| +78% | +$71.5K |
|
4655
PUT
Red Violet
RDVT
$957M
| $173K | ﹤0.01% |
+4,800
| New | +$160K |
|
4656
Tredegar Corp
TG
$260M
| $173K | ﹤0.01% |
22,615
-29,649
| -57% | -$225K |
|
|
LGF.B
4657
DELISTED
Lions Gate Entertainment Corp. Class B Non-Voting Shares
LGF.B
| $173K | ﹤0.01% |
23,021
+1,818
| +9% | +$12.7K |
|
4658
PUT
AppFolio
APPF
$6.62B
| $172K | ﹤0.01% |
700
-1,200
| -63% | -$281K |
|
|
SRTA
4659
Strata Critical Medical Inc
SRTA
$421M
| $172K | ﹤0.01% |
40,565
+13,611
| +50% | +$51.8K |
|
4660
CALL
Eastern Bankshares
EBC
$5.27B
| $172K | ﹤0.01% |
10,000
+2,800
| +39% | +$48.9K |
|
4661
PUT
Gladstone Investment Corp
GAIN
$642M
| $172K | ﹤0.01% |
13,000
+9,900
| +319% | +$135K |
|
4662
Guidewire Software
GWRE
$13.9B
| $172K | ﹤0.01% |
+1,026
| New | +$192K |
|
4663
CALL
LoveSac
LOVE
$242M
| $172K | ﹤0.01% |
7,300
-16,500
| -69% | -$494K |
|
4664
PUT
Markel Group
MKL
$25.2B
| $172K | ﹤0.01% |
100
-200
| -67% | -$332K |
|
4665
PUT
Sky Harbour Group
SKYH
$363M
| $172K | ﹤0.01% |
14,500
+11,700
| +418% | +$137K |
|
4666
PUT
Shutterstock
SSTK
$209M
| $172K | ﹤0.01% |
5,700
-5,300
| -48% | -$167K |
|
|
SLSR
4667
Solaris Resources
SLSR
$1.23B
| $172K | ﹤0.01% |
55,571
+40,611
| +271% | +$110K |
|
4668
CALL
Barnes & Noble Education
BNED
$435M
| $171K | ﹤0.01% |
+25,800
| New | +$264K |
|
4669
CALL
Goosehead Insurance
GSHD
$1.68B
| $171K | ﹤0.01% |
1,600
-2,600
| -62% | -$284K |
|
4670
CALL
Hawkins
HWKN
$2.9B
| $171K | ﹤0.01% |
1,400
+400
| +40% | +$50.5K |
|
4671
PUT
Ingersoll Rand
IR
$33.1B
| $171K | ﹤0.01% |
1,900
+1,100
| +138% | +$110K |
|
4672
Ondas Inc
ONDS
$3.87B
| $171K | ﹤0.01% |
67,070
+66,402
| +9,940% | +$68.9K |
|
4673
PUT
XP
XP
$8.43B
| $171K | ﹤0.01% |
14,500
-23,500
| -62% | -$370K |
|
4674
PUT
Butterfly Network
BFLY
$1.86B
| $170K | ﹤0.01% |
54,600
+40,500
| +287% | +$105K |
|
4675
PUT
Mid-America Apartment Communities
MAA
$16B
| $170K | ﹤0.01% |
1,100
-22,500
| -95% | -$3.51M |
|
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.