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 | |
|---|---|---|---|---|---|---|
5101
CALL
Ashland
ASH
$3.31B
| $107K | ﹤0.01% |
1,500
+400
| +36% | +$32K |
|
5102
PUT
Cogent Communications
CCOI
$658M
| $107K | ﹤0.01% |
1,400
-226,000
| -99% | -$18M |
|
5103
CALL
Cooper-Standard Automotive
CPS
$502M
| $107K | ﹤0.01% |
7,900
-200
| -2% | -$2.86K |
|
5104
PUT
Hagerty
HGTY
$1.18B
| $107K | ﹤0.01% |
11,100
+8,300
| +296% | +$90.3K |
|
5105
CALL
Legend Biotech
LEGN
$3.57B
| $107K | ﹤0.01% |
3,300
-1,700
| -34% | -$70.4K |
|
5106
CALL
Prime Medicine
PRME
$538M
| $107K | ﹤0.01% |
36,900
+2,200
| +6% | +$7.72K |
|
5107
CALL
StoneX
SNEX
$9.35B
| $107K | ﹤0.01% |
+3,713
| New | +$104K |
|
5108
CALL
Stock Yards Bancorp
SYBT
$2.69B
| $107K | ﹤0.01% |
+1,500
| New | +$106K |
|
5109
CALL
Ternium
TX
$9.57B
| $107K | ﹤0.01% |
3,700
-4,100
| -53% | -$137K |
|
5110
CALL
Marriott Vacations Worldwide
VAC
$3.38B
| $107K | ﹤0.01% |
1,200
-10,000
| -89% | -$866K |
|
5111
PUT
Weatherford International
WFRD
$6.07B
| $107K | ﹤0.01% |
1,500
+1,400
| +1,400% | +$115K |
|
|
WSR
5112
CALL
DELISTED
Whitestone REIT
WSR
| $107K | ﹤0.01% |
7,600
+1,700
| +29% | +$24.3K |
|
|
SEI
5113
Solaris Energy Infrastructure
SEI
$3.17B
| $107K | ﹤0.01% |
3,725
+2,689
| +260% | +$53.5K |
|
5114
CALL
Ameren
AEE
$30.1B
| $106K | ﹤0.01% |
1,200
-5,400
| -82% | -$484K |
|
5115
CALL
Ares Management
ARES
$28.2B
| $106K | ﹤0.01% |
600
-26,800
| -98% | -$4.57M |
|
5116
Gladstone Capital
GLAD
$427M
| $106K | ﹤0.01% |
+3,756
| New | +$97.3K |
|
5117
PUT
Hexcel
HXL
$7.78B
| $106K | ﹤0.01% |
1,700
-100
| -6% | -$6.18K |
|
5118
CALL
Novanta
NOVT
$5.06B
| $106K | ﹤0.01% |
700
-200
| -22% | -$33.9K |
|
5119
NovoCure
NVCR
$1.78B
| $106K | ﹤0.01% |
+3,587
| New | +$75.9K |
|
5120
CALL
Walker & Dunlop
WD
$1.68B
| $106K | ﹤0.01% |
1,100
+600
| +120% | +$64.9K |
|
5121
PUT
Weyerhaeuser
WY
$17.3B
| $106K | ﹤0.01% |
3,800
-3,700
| -49% | -$115K |
|
5122
CALL
Amplitude
AMPL
$1.17B
| $105K | ﹤0.01% |
10,000
-19,600
| -66% | -$196K |
|
5123
PUT
Alpha Pro Tech
APT
$50.6M
| $105K | ﹤0.01% |
20,000
+2,300
| +13% | +$12.6K |
|
5124
CALL
Granite Construction
GVA
$5.34B
| $105K | ﹤0.01% |
1,200
-400
| -25% | -$36K |
|
5125
CALL
Kirby Corp
KEX
$7.13B
| $105K | ﹤0.01% |
+1,000
| New | +$121K |
|
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.