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 | |
|---|---|---|---|---|---|---|
6876
Teleflex
TFX
$5.94B
| $18K | ﹤0.01% |
157
+144
| +1,108% | +$18.2K |
|
|
TGI
6877
PUT
DELISTED
Triumph Group
TGI
| $18K | ﹤0.01% |
700
| – | – |
|
6878
PUT
Zentalis Pharmaceuticals
ZNTL
$329M
| $18K | ﹤0.01% |
16,000
+10,200
| +176% | +$13.5K |
|
6879
CALL
American Healthcare REIT
AHR
$11.1B
| $18K | ﹤0.01% |
500
-3,700
| -88% | -$123K |
|
6880
PUT
United Parks & Resorts
PRKS
$2.21B
| $18K | ﹤0.01% |
+400
| New | +$17.9K |
|
6881
CALL
Metallus
MTUS
$879M
| $18K | ﹤0.01% |
1,200
+700
| +140% | +$9.32K |
|
|
USOY
6882
Defiance Oil Enhanced Options Income ETF
USOY
$61.8M
| $18K | ﹤0.01% |
+1,935
| New | +$19.7K |
|
|
AIFU
6883
CALL
AIFU Inc
AIFU
$190M
| $18K | ﹤0.01% |
+155
| New | +$10.4K |
|
|
QTOP
6884
iShares Nasdaq Top 30 Stocks ETF
QTOP
$274M
| $18K | ﹤0.01% |
667
-50
| -7% | -$1.26K |
|
6885
PUT
ProFrac Holding
ACDC
$671M
| $17K | ﹤0.01% |
2,300
+100
| +5% | +$655 |
|
6886
Arteris
AIP
$1.34B
| $17K | ﹤0.01% |
1,871
+1,091
| +140% | +$8.04K |
|
|
AIRL
6887
PUT
DELISTED
Themes Airlines ETF
AIRL
| $17K | ﹤0.01% |
+2,300
| New | +$66.8K |
|
6888
CALL
Bankunited
BKU
$3.41B
| $17K | ﹤0.01% |
500
+400
| +400% | +$13.4K |
|
|
BORR
6889
PUT
Borr Drilling
BORR
$1.2B
| $17K | ﹤0.01% |
9,600
+3,400
| +55% | +$6.42K |
|
6890
PUT
CDW
CDW
$18.4B
| $17K | ﹤0.01% |
100
-8,600
| -99% | -$1.46M |
|
6891
CALL
Codexis
CDXS
$136M
| $17K | ﹤0.01% |
7,000
+4,600
| +192% | +$10.8K |
|
6892
PUT
Compass Therapeutics
CMPX
$367M
| $17K | ﹤0.01% |
6,600
-324,700
| -98% | -$670K |
|
6893
PUT
Customers Bancorp
CUBI
$2.69B
| $17K | ﹤0.01% |
300
-3,500
| -92% | -$177K |
|
6894
PUT
Delcath Systems
DCTH
$399M
| $17K | ﹤0.01% |
1,300
+700
| +117% | +$9.76K |
|
6895
Diana Shipping
DSX
$270M
| $17K | ﹤0.01% |
12,196
+2,086
| +21% | +$3.13K |
|
6896
CALL
8x8 Inc
EGHT
$271M
| $17K | ﹤0.01% |
8,800
-100
| -1% | -$177 |
|
6897
PUT
EnerSys
ENS
$6.69B
| $17K | ﹤0.01% |
+200
| New | +$17.4K |
|
|
FARO
6898
PUT
DELISTED
Faro Technologies
FARO
| $17K | ﹤0.01% |
+400
| New | +$14.6K |
|
6899
Flowserve
FLS
$9.38B
| $17K | ﹤0.01% |
333
-4,368
| -93% | -$205K |
|
6900
CALL
Glacier Bancorp
GBCI
$6.45B
| $17K | ﹤0.01% |
400
| – | – |
|
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.