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 |
NVIDIA
NVDA
|
+$172M |
| 2 |
Apple
AAPL
|
+$156M |
| 3 |
Broadcom
AVGO
|
+$101M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$57.2M |
| 5 |
UnitedHealth
UNH
|
+$55.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$140M |
| 2 |
Amazon
AMZN
|
+$47.9M |
| 3 |
Netflix
NFLX
|
+$38.3M |
| 4 |
TSMC
TSM
|
+$37.3M |
| 5 |
Pfizer
PFE
|
+$36.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.74% |
| 2 | Communication Services | 0.19% |
| 3 | Consumer Discretionary | 0.18% |
| 4 | Healthcare | 0.17% |
| 5 | Financials | 0.14% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
5801
PUT
Warner Music
WMG
$14.4B
| $57K | ﹤0.01% |
2,100
-13,100
| -86% | -$366K |
|
|
BZAI
5802
CALL
Blaize Holdings
BZAI
$115M
| $57K | ﹤0.01% |
19,200
-21,500
| -53% | -$52.9K |
|
5803
CALL
ABM Industries
ABM
$2.79B
| $56K | ﹤0.01% |
1,200
+200
| +20% | +$9.67K |
|
5804
PUT
Blink Charging
BLNK
$70.4M
| $56K | ﹤0.01% |
59,900
-33,100
| -36% | -$26.4K |
|
5805
CALL
ClearPoint Neuro
CLPT
$437M
| $56K | ﹤0.01% |
4,700
+3,900
| +488% | +$49.1K |
|
5806
CALL
Camden Property Trust
CPT
$11.2B
| $56K | ﹤0.01% |
+500
| New | +$57.7K |
|
|
CVAC
5807
PUT
DELISTED
CureVac
CVAC
| $56K | ﹤0.01% |
10,400
-4,900
| -32% | -$19.4K |
|
5808
PUT
Cemex
CX
$17.2B
| $56K | ﹤0.01% |
8,100
+3,200
| +65% | +$20.3K |
|
5809
PUT
Healthpeak Properties
DOC
$15.2B
| $56K | ﹤0.01% |
3,200
-5,600
| -64% | -$99.5K |
|
5810
PUT
Essex Property Trust
ESS
$18.1B
| $56K | ﹤0.01% |
200
| – | – |
|
5811
PUT
Genco Shipping & Trading
GNK
$1.13B
| $56K | ﹤0.01% |
4,300
-2,400
| -36% | -$31.7K |
|
5812
CALL
Harmony Biosciences
HRMY
$2.08B
| $56K | ﹤0.01% |
1,800
-2,300
| -56% | -$74K |
|
5813
PUT
MGP Ingredients
MGPI
$380M
| $56K | ﹤0.01% |
1,900
+300
| +19% | +$8.92K |
|
5814
Progyny
PGNY
$2.47B
| $56K | ﹤0.01% |
+2,557
| New | +$56.1K |
|
5815
PUT
Saic
SAIC
$4.89B
| $56K | ﹤0.01% |
500
-300
| -38% | -$34.2K |
|
5816
PUT
Neuronetics
STIM
$137M
| $56K | ﹤0.01% |
16,300
-9,000
| -36% | -$35.5K |
|
|
AD
5817
Array Digital Infrastructure
AD
$3.02B
| $56K | ﹤0.01% |
+884
| New | +$56.2K |
|
5818
WEC Energy
WEC
$35.8B
| $56K | ﹤0.01% |
+547
| New | +$58.2K |
|
|
XRPT
5819
Volatility Shares Trust XRP 2X ETF
XRPT
$54.7M
| $56K | ﹤0.01% |
+215
| New | +$54.4K |
|
|
AUTL
5820
CALL
Autolus Therapeutics
AUTL
$407M
| $55K | ﹤0.01% |
24,200
-13,200
| -35% | -$21.8K |
|
5821
Blend Labs
BLND
$424M
| $55K | ﹤0.01% |
16,859
-1,299
| -7% | -$4.4K |
|
5822
PUT
CareTrust REIT
CTRE
$9.84B
| $55K | ﹤0.01% |
1,800
+1,700
| +1,700% | +$49K |
|
5823
PUT
CubeSmart
CUBE
$9.34B
| $55K | ﹤0.01% |
1,300
| – | – |
|
|
DAWN
5824
CALL
DELISTED
Day One Biopharmaceuticals
DAWN
| $55K | ﹤0.01% |
8,600
-5,600
| -39% | -$38.5K |
|
5825
Eastern Bankshares
EBC
$5.29B
| $55K | ﹤0.01% |
+3,620
| New | +$54.4K |
|
Similar funds
Simplex Trading's Q2 2025 Portfolio in Review
As of Q2 2025, Simplex Trading held 10,048 positions worth $175B, up 12% from $156B the previous quarter. Its ten largest holdings account for 47% of the portfolio.
Simplex Trading withdrew a net $10.5B in Q2 2025, closing 1,431 positions and reducing 3,590 holdings. Its most notable exit was Constellation Energy, an estimated $35.8M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.74% of assets, up from 0.41% a quarter earlier, followed by Communication Services and Consumer Discretionary.
Against the trend, Simplex Trading opened a new position in State Street SPDR S&P 500 ETF Trust worth $61.9M.
- Simplex Trading's largest Q2 2025 buy was State Street SPDR S&P 500 ETF Trust: 100,129 shares worth $61.9M.
- Simplex Trading added most to NVIDIA in Q2 2025, an estimated $172M increase.
- Simplex Trading's biggest Q2 2025 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $140M.
- Simplex Trading fully exited Constellation Energy in Q2 2025, selling an estimated $35.8M.
- Simplex Trading's ten largest holdings make up 47% of its $175B portfolio in Q2 2025.
- Simplex Trading opened 1,525 new positions and closed 1,431 in Q2 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $175B.
Based on Simplex Trading's 13F filing for Q2 2025, filed 5 Aug 2025.