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 | |
|---|---|---|---|---|---|---|
3351
CALL
Rush Street Interactive
RSI
$3.26B
| $591K | ﹤0.01% |
43,100
-7,400
| -15% | -$90K |
|
3352
Allegiant Air
ALGT
$2.66B
| $590K | ﹤0.01% |
6,269
-14,128
| -69% | -$1.03M |
|
3353
PUT
Denison Mines
DNN
$2.64B
| $590K | ﹤0.01% |
327,900
+121,000
| +58% | +$255K |
|
3354
ProShares Ultra Semiconductors
USD
$2.48B
| $589K | ﹤0.01% |
18,100
+7,012
| +63% | +$233K |
|
3355
CALL
Allegro MicroSystems
ALGM
$8.72B
| $588K | ﹤0.01% |
26,900
-12,000
| -31% | -$256K |
|
3356
PUT
Sonos
SONO
$1.87B
| $586K | ﹤0.01% |
39,000
+28,900
| +286% | +$389K |
|
3357
CALL
Smith & Wesson
SWBI
$666M
| $586K | ﹤0.01% |
58,000
-19,900
| -26% | -$249K |
|
3358
PUT
ITT
ITT
$17.7B
| $585K | ﹤0.01% |
4,100
+2,300
| +128% | +$344K |
|
3359
PUT
Phunware
PHUN
$43.1M
| $585K | ﹤0.01% |
+112,600
| New | +$621K |
|
3360
Vanguard S&P 500 Growth ETF
VOOG
$25.3B
| $585K | ﹤0.01% |
+9,600
| New | +$576K |
|
3361
PUT
Extra Space Storage
EXR
$31.3B
| $583K | ﹤0.01% |
3,900
+2,700
| +225% | +$443K |
|
3362
Globalstar
GSAT
$10.2B
| $583K | ﹤0.01% |
18,790
+5,482
| +41% | +$136K |
|
3363
Saic
SAIC
$5.01B
| $583K | ﹤0.01% |
+5,223
| New | +$689K |
|
3364
Stanley Black & Decker
SWK
$14.6B
| $582K | ﹤0.01% |
7,250
-58,356
| -89% | -$5.41M |
|
|
TRTX
3365
PUT
TPG RE Finance Trust
TRTX
$662M
| $581K | ﹤0.01% |
68,400
-2,100
| -3% | -$18.3K |
|
3366
PUT
Cars.com
CARS
$660M
| $580K | ﹤0.01% |
33,500
+400
| +1% | +$6.99K |
|
3367
PUT
Mueller Industries
MLI
$14.2B
| $579K | ﹤0.01% |
14,600
+13,000
| +813% | +$528K |
|
3368
CALL
Revolve Group
RVLV
$1.84B
| $579K | ﹤0.01% |
17,300
+8,400
| +94% | +$260K |
|
3369
PUT
Fluence Energy
FLNC
$1.79B
| $578K | ﹤0.01% |
36,400
+16,300
| +81% | +$319K |
|
3370
Compass
COMP
$8.82B
| $577K | ﹤0.01% |
+98,793
| New | +$626K |
|
3371
Ollie's Bargain Outlet
OLLI
$4.04B
| $577K | ﹤0.01% |
+5,265
| New | +$524K |
|
3372
CALL
Advanced Drainage Systems
WMS
$11B
| $577K | ﹤0.01% |
5,000
-18,100
| -78% | -$2.51M |
|
|
BPMC
3373
DELISTED
Blueprint Medicines
BPMC
| $576K | ﹤0.01% |
+6,608
| New | +$605K |
|
3374
PUT
LegalZoom.com
LZ
$1.3B
| $576K | ﹤0.01% |
76,700
-4,400
| -5% | -$33.1K |
|
3375
PUT
Ultragenyx Pharmaceutical
RARE
$2.65B
| $576K | ﹤0.01% |
13,700
+3,700
| +37% | +$184K |
|
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.