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 | |
|---|---|---|---|---|---|---|
5301
CALL
Bank of Marin Bancorp
BMRC
$472M
| $87K | ﹤0.01% |
+3,700
| New | +$87.3K |
|
5302
Global X Autonomous & Electric Vehicles ETF
DRIV
$377M
| $87K | ﹤0.01% |
3,799
+3,618
| +1,999% | +$84.5K |
|
5303
PUT
Gossamer Bio
GOSS
$82.9M
| $87K | ﹤0.01% |
96,700
+32,800
| +51% | +$28.1K |
|
5304
CALL
Jack Henry & Associates
JKHY
$10.9B
| $87K | ﹤0.01% |
500
+400
| +400% | +$71.5K |
|
5305
CALL
Kayne Anderson Energy Infrastructure Fund
KYN
$2.47B
| $87K | ﹤0.01% |
+6,900
| New | +$85.2K |
|
5306
CALL
Leslie's
LESL
$8.9M
| $87K | ﹤0.01% |
1,970
-870
| -31% | -$46.2K |
|
|
ORIO
5307
CALL
Orion Digital Corp
ORIO
$15.4M
| $87K | ﹤0.01% |
+64,200
| New | +$81K |
|
5308
CALL
Sinclair Inc
SBGI
$992M
| $87K | ﹤0.01% |
5,400
-19,600
| -78% | -$330K |
|
5309
CALL
Sonoco
SON
$5.57B
| $87K | ﹤0.01% |
1,800
-300
| -14% | -$15.5K |
|
|
SRDX
5310
CALL
DELISTED
Surmodics
SRDX
| $87K | ﹤0.01% |
2,200
+100
| +5% | +$3.89K |
|
5311
PUT
Sensata Technologies
ST
$6.74B
| $87K | ﹤0.01% |
3,200
-700
| -18% | -$22.7K |
|
5312
Talkspace
TALK
$874M
| $87K | ﹤0.01% |
28,354
+10,117
| +55% | +$30.8K |
|
|
TPH
5313
DELISTED
Tri Pointe Homes
TPH
| $87K | ﹤0.01% |
+2,422
| New | +$101K |
|
|
AD
5314
CALL
Array Digital Infrastructure
AD
$3.01B
| $87K | ﹤0.01% |
1,400
-400
| -22% | -$24.4K |
|
5315
Direxion Daily Consumer Discretionary Bull 3X ETF
WANT
$16.2M
| $87K | ﹤0.01% |
1,613
+1,611
| +80,550% | +$78.9K |
|
5316
CALL
Workiva
WK
$3.36B
| $87K | ﹤0.01% |
800
-14,300
| -95% | -$1.32M |
|
|
XNET
5317
PUT
Xunlei
XNET
$340M
| $87K | ﹤0.01% |
43,900
+38,300
| +684% | +$77.7K |
|
|
ODVWW
5318
CALL
DELISTED
Osisko Development Corp. Warrant
ODVWW
| $87K | ﹤0.01% |
+53,600
| New | +$87K |
|
5319
CALL
Chegg
CHGG
$110M
| $86K | ﹤0.01% |
53,800
+31,400
| +140% | +$57.9K |
|
|
KYNB
5320
CALL
Kyntra Bio
KYNB
$27.2M
| $86K | ﹤0.01% |
6,552
+432
| +7% | +$4.01K |
|
5321
Fresenius Medical Care
FMS
$13.8B
| $86K | ﹤0.01% |
3,806
+3,430
| +912% | +$74.5K |
|
5322
StealthGas
GASS
$332M
| $86K | ﹤0.01% |
15,290
+6,030
| +65% | +$35.3K |
|
5323
PUT
Jazz Pharmaceuticals
JAZZ
$15.9B
| $86K | ﹤0.01% |
700
-2,300
| -77% | -$271K |
|
|
KLG
5324
CALL
DELISTED
WK Kellogg Co
KLG
| $86K | ﹤0.01% |
4,800
-16,300
| -77% | -$298K |
|
5325
CALL
ManpowerGroup
MAN
$2.44B
| $86K | ﹤0.01% |
1,500
+1,300
| +650% | +$82.8K |
|
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.