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 | |
|---|---|---|---|---|---|---|
4926
CALL
Rigel Pharmaceuticals
RIGL
$723M
| $131K | ﹤0.01% |
7,800
-11,900
| -60% | -$228K |
|
4927
Spectrum Brands
SPB
$2.03B
| $131K | ﹤0.01% |
1,561
-2,110
| -57% | -$191K |
|
|
VFLQ
4928
PUT
DELISTED
Vanguard U.S. Liquidity Factor ETF
VFLQ
| $131K | ﹤0.01% |
800
+300
| +60% | +$49.1K |
|
4929
AerSale
ASLE
$291M
| $130K | ﹤0.01% |
20,719
-23,533
| -53% | -$135K |
|
4930
PUT
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $130K | ﹤0.01% |
1,300
-19,400
| -94% | -$1.51M |
|
4931
CALL
Lufax Holding
LU
$1.33B
| $130K | ﹤0.01% |
77,300
+30,900
| +67% | +$85.3K |
|
4932
CALL
Neonode
NEON
$12.6M
| $130K | ﹤0.01% |
15,800
-33,800
| -68% | -$259K |
|
4933
PUT
Spire Global
SPIR
$408M
| $130K | ﹤0.01% |
9,300
-2,500
| -21% | -$30.5K |
|
4934
Smith & Wesson
SWBI
$649M
| $130K | ﹤0.01% |
+12,890
| New | +$161K |
|
4935
PUT
ACI Worldwide
ACIW
$6.12B
| $129K | ﹤0.01% |
+2,500
| New | +$133K |
|
4936
Alto Ingredients
ALTO
$338M
| $129K | ﹤0.01% |
82,983
-23,545
| -22% | -$36.9K |
|
|
INFA
4937
DELISTED
Informatica
INFA
| $129K | ﹤0.01% |
4,977
-6,502
| -57% | -$170K |
|
4938
CALL
Rekor Systems
REKR
$82.6M
| $129K | ﹤0.01% |
83,200
-30,900
| -27% | -$32.1K |
|
4939
CALL
Sotera Health
SHC
$5B
| $129K | ﹤0.01% |
9,500
| – | – |
|
4940
ARS Pharmaceuticals
SPRY
$579M
| $129K | ﹤0.01% |
12,306
-43,309
| -78% | -$607K |
|
4941
YieldMax Universe Fund of Option Income ETFs
YMAX
$384M
| $129K | ﹤0.01% |
+7,650
| New | +$136K |
|
|
GOLD
4942
PUT
Gold.com Inc
GOLD
$1.16B
| $128K | ﹤0.01% |
4,700
-1,900
| -29% | -$64.5K |
|
4943
PUT
Chegg
CHGG
$116M
| $128K | ﹤0.01% |
79,700
-83,900
| -51% | -$155K |
|
4944
PUT
Gen Digital
GEN
$16.5B
| $128K | ﹤0.01% |
4,700
-10,300
| -69% | -$296K |
|
4945
CALL
Renasant Corp
RNST
$4.01B
| $128K | ﹤0.01% |
+3,600
| New | +$127K |
|
4946
CALL
SPS Commerce
SPSC
$2.55B
| $128K | ﹤0.01% |
700
+100
| +17% | +$18.8K |
|
4947
CALL
Tenaris
TS
$28.2B
| $128K | ﹤0.01% |
3,400
-10,000
| -75% | -$355K |
|
4948
CALL
Weatherford International
WFRD
$5.9B
| $128K | ﹤0.01% |
1,800
-3,600
| -67% | -$295K |
|
4949
CALL
Healthcare Realty
HR
$7.56B
| $127K | ﹤0.01% |
7,500
+5,400
| +257% | +$95K |
|
4950
Hyliion Holdings
HYLN
$578M
| $127K | ﹤0.01% |
48,966
+21,471
| +78% | +$59.7K |
|
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.