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 | |
|---|---|---|---|---|---|---|
|
AHRT
6301
CALL
AH Realty Trust
AHRT
$529M
| $31K | ﹤0.01% |
3,100
-17,900
| -85% | -$195K |
|
|
AKYA
6302
CALL
DELISTED
Akoya BioSciences
AKYA
| $31K | ﹤0.01% |
13,900
-200
| -1% | -$530 |
|
6303
YieldMax AMZN Option Income Strategy ETF
AMZY
$268M
| $31K | ﹤0.01% |
+1,653
| New | +$32.4K |
|
6304
Angi Inc
ANGI
$229M
| $31K | ﹤0.01% |
+1,874
| New | +$39.9K |
|
6305
CALL
Barings BDC
BBDC
$864M
| $31K | ﹤0.01% |
3,300
-11,800
| -78% | -$115K |
|
6306
CALL
Bain Capital Specialty
BCSF
$806M
| $31K | ﹤0.01% |
1,800
-1,800
| -50% | -$30.4K |
|
6307
CALL
Black Diamond Therapeutics
BDTX
$96.8M
| $31K | ﹤0.01% |
14,600
-231,700
| -94% | -$664K |
|
|
CODX
6308
PUT
Co-Diagnostics
CODX
$5.31M
| $31K | ﹤0.01% |
1,400
+1,327
| +1,818% | +$41.9K |
|
|
CSGS
6309
DELISTED
CSG Systems International
CSGS
| $31K | ﹤0.01% |
621
+59
| +10% | +$3.04K |
|
6310
Design Therapeutics
DSGN
$761M
| $31K | ﹤0.01% |
5,168
-2,434
| -32% | -$14.1K |
|
6311
PUT
First American
FAF
$7.66B
| $31K | ﹤0.01% |
500
| – | – |
|
6312
PUT
First Trust Asia Pacific ex-Japan AlphaDEX Fund
FPA
$100M
| $31K | ﹤0.01% |
2,100
+1,600
| +320% | +$46.9K |
|
|
HUYA
6313
CALL
Huya Inc
HUYA
$563M
| $31K | ﹤0.01% |
10,300
-11,700
| -53% | -$41.5K |
|
6314
PUT
ICU Medical
ICUI
$4.21B
| $31K | ﹤0.01% |
+200
| New | +$33.8K |
|
6315
PUT
Comstock
LODE
$208M
| $31K | ﹤0.01% |
3,880
+1,710
| +79% | +$7.3K |
|
6316
First Trust India Nifty 50 Equal Weight ETF
NFTY
$134M
| $31K | ﹤0.01% |
+564
| New | +$33.7K |
|
6317
CALL
Outfront Media
OUT
$5.61B
| $31K | ﹤0.01% |
1,757
-62,554
| -97% | -$1.16M |
|
6318
PUT
Protolabs
PRLB
$1.79B
| $31K | ﹤0.01% |
800
-1,900
| -70% | -$68.3K |
|
6319
Hoya Capital High Dividend Yield ETF
RIET
$107M
| $31K | ﹤0.01% |
3,107
+2,122
| +215% | +$22.7K |
|
6320
CALL
Riskified
RSKD
$694M
| $31K | ﹤0.01% |
6,700
-100
| -1% | -$464 |
|
6321
CALL
Vivid Seats
SEAT
$84.6M
| $31K | ﹤0.01% |
345
+270
| +360% | +$20.1K |
|
|
SF
6322
PUT
Stifel
SF
$12.6B
| $31K | ﹤0.01% |
450
-1,950
| -81% | -$139K |
|
6323
SGHC Ltd
SGHC
$7.11B
| $31K | ﹤0.01% |
4,984
-7,653
| -61% | -$40.8K |
|
6324
SkinHealth Systems
SKIN
$88.8M
| $31K | ﹤0.01% |
19,685
+3,227
| +20% | +$5.07K |
|
6325
PUT
Sumitomo Mitsui Financial
SMFG
$164B
| $31K | ﹤0.01% |
2,200
+1,500
| +214% | +$20.6K |
|
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.