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 | |
|---|---|---|---|---|---|---|
5351
CALL
Clearwater Paper
CLW
$341M
| $89K | ﹤0.01% |
3,300
-85,400
| -96% | -$2.31M |
|
|
TDAY
5352
PUT
USA Today Co
TDAY
$1.28B
| $89K | ﹤0.01% |
25,000
| – | – |
|
5353
CALL
Lineage Cell Therapeutics
LCTX
$277M
| $89K | ﹤0.01% |
98,200
-8,200
| -8% | -$4.86K |
|
5354
PUT
Lifestance Health
LFST
$4.1B
| $89K | ﹤0.01% |
17,400
+17,000
| +4,250% | +$102K |
|
5355
Roper Technologies
ROP
$38.5B
| $89K | ﹤0.01% |
158
-137
| -46% | -$77.4K |
|
|
APPX
5356
CALL
Tradr 2X Long APP Daily ETF
APPX
$61.6M
| $89K | ﹤0.01% |
+1,100
| New | +$45.6K |
|
5357
PUT
Arbutus Biopharma
ABUS
$871M
| $88K | ﹤0.01% |
28,600
+8,700
| +44% | +$28.9K |
|
5358
PUT
ADC Therapeutics
ADCT
$141M
| $88K | ﹤0.01% |
+32,900
| New | +$69.2K |
|
5359
PUT
Angi Inc
ANGI
$229M
| $88K | ﹤0.01% |
5,800
+700
| +14% | +$10.1K |
|
|
ASA
5360
CALL
ASA Gold and Precious Metals
ASA
$955M
| $88K | ﹤0.01% |
2,800
-700
| -20% | -$21.4K |
|
5361
PUT
Alphatec Holdings
ATEC
$1.49B
| $88K | ﹤0.01% |
8,000
-56,700
| -88% | -$651K |
|
|
BGFV
5362
DELISTED
Big 5 Sporting Goods
BGFV
| $88K | ﹤0.01% |
+62,122
| New | +$66.6K |
|
5363
CALL
Crexendo
CXDO
$221M
| $88K | ﹤0.01% |
14,600
-3,000
| -17% | -$15.7K |
|
5364
Delcath Systems
DCTH
$416M
| $88K | ﹤0.01% |
6,505
+2,958
| +83% | +$41.2K |
|
|
DEA
5365
PUT
Easterly Government Properties
DEA
$1.15B
| $88K | ﹤0.01% |
4,000
+2,480
| +163% | +$54.1K |
|
5366
iShares MSCI South Africa ETF
EZA
$551M
| $88K | ﹤0.01% |
+1,648
| New | +$82.7K |
|
5367
PUT
Frontdoor
FTDR
$5.16B
| $88K | ﹤0.01% |
+1,500
| New | +$75.3K |
|
5368
HEICO Corp Class A
HEI.A
$35.8B
| $88K | ﹤0.01% |
343
-481
| -58% | -$105K |
|
5369
CALL
Hartford Financial Services
HIG
$39.2B
| $88K | ﹤0.01% |
700
-6,700
| -91% | -$833K |
|
5370
Ivanhoe Electric
IE
$1.48B
| $88K | ﹤0.01% |
9,808
+4,033
| +70% | +$28K |
|
5371
PUT
Phinia Inc
PHIN
$2.7B
| $88K | ﹤0.01% |
+2,000
| New | +$84.4K |
|
5372
PUT
Sabra Healthcare REIT
SBRA
$5.38B
| $88K | ﹤0.01% |
4,800
-1,000
| -17% | -$17.7K |
|
|
UCTT
5373
CALL
Ultra Clean Holdings
UCTT
$3.73B
| $88K | ﹤0.01% |
3,900
-200
| -5% | -$4.11K |
|
5374
Advanced Drainage Systems
WMS
$10.5B
| $88K | ﹤0.01% |
774
-2,455
| -76% | -$275K |
|
5375
BlackBerry
BB
$4.95B
| $87K | ﹤0.01% |
19,141
-153,309
| -89% | -$578K |
|
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.