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 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5276
PUT
Exponent
EXPO
$3.24B
| $81K | ﹤0.01% |
+1,000
| New | +$87.1K |
|
5277
Fiverr
FVRR
$321M
| $81K | ﹤0.01% |
+3,426
| New | +$99.6K |
|
5278
PUT
Gran Tierra Energy
GTE
$265M
| $81K | ﹤0.01% |
16,500
+14,500
| +725% | +$83.2K |
|
5279
Illumina
ILMN
$31B
| $81K | ﹤0.01% |
1,024
-6,071
| -86% | -$657K |
|
5280
Immunome
IMNM
$2.58B
| $81K | ﹤0.01% |
12,154
+5,874
| +94% | +$56.4K |
|
5281
Prologis
PLD
$135B
| $81K | ﹤0.01% |
+729
| New | +$84.3K |
|
5282
ProPetro Holding
PUMP
$1.36B
| $81K | ﹤0.01% |
+11,031
| New | +$95.9K |
|
5283
Revolve Group
RVLV
$1.8B
| $81K | ﹤0.01% |
3,793
-2,708
| -42% | -$75.2K |
|
5284
PUT
Saratoga Investment
SAR
$312M
| $81K | ﹤0.01% |
3,200
+3,000
| +1,500% | +$74.6K |
|
|
BIOA
5285
BioAge Labs
BIOA
$402M
| $81K | ﹤0.01% |
+21,603
| New | +$99.9K |
|
|
NAGE
5286
CALL
Niagen Bioscience
NAGE
$271M
| $81K | ﹤0.01% |
11,800
-15,500
| -57% | -$97.4K |
|
5287
ACI Worldwide
ACIW
$5.83B
| $80K | ﹤0.01% |
1,480
-832
| -36% | -$44.1K |
|
5288
Church & Dwight Co
CHD
$23.4B
| $80K | ﹤0.01% |
+730
| New | +$78.1K |
|
5289
Cumberland Pharmaceuticals
CPIX
$100M
| $80K | ﹤0.01% |
+19,100
| New | +$79.2K |
|
5290
CALL
Designer Brands
DBI
$307M
| $80K | ﹤0.01% |
22,100
-20,300
| -48% | -$95.4K |
|
5291
Donaldson
DCI
$10.9B
| $80K | ﹤0.01% |
+1,196
| New | +$82.7K |
|
5292
CALL
3D Systems Corp
DDD
$431M
| $80K | ﹤0.01% |
38,100
-86,700
| -69% | -$295K |
|
5293
GeoPark
GPRK
$633M
| $80K | ﹤0.01% |
9,915
+8,003
| +419% | +$71.8K |
|
5294
Heartland Express
HTLD
$948M
| $80K | ﹤0.01% |
8,701
+8,698
| +289,933% | +$92.1K |
|
5295
Lexicon Pharmaceuticals
LXRX
$1.03B
| $80K | ﹤0.01% |
174,982
+78,899
| +82% | +$49.8K |
|
5296
MediaAlpha
MAX
$758M
| $80K | ﹤0.01% |
8,718
+6,981
| +402% | +$74.5K |
|
5297
Nutrien
NTR
$33.2B
| $80K | ﹤0.01% |
1,627
-33,890
| -95% | -$1.73M |
|
5298
PUT
Penumbra
PEN
$12.7B
| $80K | ﹤0.01% |
300
| – | – |
|
|
SCPH
5299
CALL
DELISTED
scPharmaceuticals
SCPH
| $80K | ﹤0.01% |
30,500
-3,700
| -11% | -$12.1K |
|
5300
PUT
abrdn Physical Gold Shares ETF
SGOL
$6.91B
| $80K | ﹤0.01% |
+2,700
| New | +$73.9K |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.