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 | |
|---|---|---|---|---|---|---|
5376
PUT
Fox Factory Holding Corp
FOXF
$755M
| $81K | ﹤0.01% |
2,700
-800
| -23% | -$27.6K |
|
|
FRGE
5377
CALL
DELISTED
Forge Global Holdings
FRGE
| $81K | ﹤0.01% |
5,807
| – | – |
|
5378
Immersion
IMMR
$251M
| $81K | ﹤0.01% |
9,284
-3
| -0% | -$26 |
|
5379
CALL
Kura Oncology
KURA
$800M
| $81K | ﹤0.01% |
9,300
+6,200
| +200% | +$89.2K |
|
5380
CALL
Larimar Therapeutics
LRMR
$397M
| $81K | ﹤0.01% |
21,100
-123,000
| -85% | -$812K |
|
|
HTT
5381
High Templar Tech Ltd
HTT
$379M
| $81K | ﹤0.01% |
28,807
+14,236
| +98% | +$35.9K |
|
|
SGMO
5382
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $81K | ﹤0.01% |
79,700
+69,000
| +645% | +$126K |
|
5383
TTEC Holdings
TTEC
$121M
| $81K | ﹤0.01% |
16,403
-7,242
| -31% | -$37.9K |
|
|
VMEO
5384
DELISTED
Vimeo
VMEO
| $81K | ﹤0.01% |
12,676
+9,539
| +304% | +$57.4K |
|
|
CON
5385
Concentra Group Holdings
CON
$4.05B
| $81K | ﹤0.01% |
4,130
+4,096
| +12,047% | +$84.7K |
|
5386
PUT
Annexon
ANNX
$835M
| $80K | ﹤0.01% |
15,700
-35,700
| -69% | -$220K |
|
|
BLDP
5387
Ballard Power Systems
BLDP
$805M
| $80K | ﹤0.01% |
48,763
+30,335
| +165% | +$47.3K |
|
5388
Southwest Airlines
LUV
$22B
| $80K | ﹤0.01% |
2,386
-406,030
| -99% | -$13M |
|
5389
T-Rex 2X Inverse NVIDIA Daily Target ETF
NVDQ
$21.6M
| $80K | ﹤0.01% |
+1,214
| New | +$84.3K |
|
5390
PUT
Playboy Inc
PLBY
$128M
| $80K | ﹤0.01% |
54,800
+51,300
| +1,466% | +$59.4K |
|
5391
CALL
PROG Holdings
PRG
$1.75B
| $80K | ﹤0.01% |
1,900
-100
| -5% | -$4.62K |
|
5392
CALL
Reliance Steel & Aluminium
RS
$20.7B
| $80K | ﹤0.01% |
300
-6,300
| -95% | -$1.87M |
|
|
XIFR
5393
CALL
XPLR Infrastructure LP
XIFR
$1.12B
| $80K | ﹤0.01% |
175,700
-93,100
| -35% | -$1.86M |
|
5394
Cognex
CGNX
$10.9B
| $79K | ﹤0.01% |
2,228
+701
| +46% | +$27.5K |
|
5395
Fidelity MSCI Industrials Index ETF
FIDU
$2.3B
| $79K | ﹤0.01% |
1,136
+790
| +228% | +$58.2K |
|
5396
PUT
Genmab
GMAB
$17.7B
| $79K | ﹤0.01% |
3,800
+3,600
| +1,800% | +$79.1K |
|
5397
PUT
Highwoods Properties
HIW
$3.65B
| $79K | ﹤0.01% |
2,600
-800
| -24% | -$26.1K |
|
5398
Mama's Creations
MAMA
$857M
| $79K | ﹤0.01% |
9,992
-42,615
| -81% | -$353K |
|
5399
PUT
M/I Homes
MHO
$3.74B
| $79K | ﹤0.01% |
600
-2,100
| -78% | -$331K |
|
5400
nVent Electric
NVT
$24.9B
| $79K | ﹤0.01% |
1,173
+647
| +123% | +$47.7K |
|
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.