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 | |
|---|---|---|---|---|---|---|
3951
CALL
Genmab
GMAB
$17.8B
| $332K | ﹤0.01% |
16,100
+14,500
| +906% | +$298K |
|
3952
CALL
NeoGenomics
NEO
$1.74B
| $332K | ﹤0.01% |
45,500
-21,100
| -32% | -$170K |
|
3953
CALL
Marriott Vacations Worldwide
VAC
$3.52B
| $332K | ﹤0.01% |
4,600
-2,100
| -31% | -$132K |
|
3954
PUT
Akebia Therapeutics
AKBA
$341M
| $331K | ﹤0.01% |
91,000
-104,100
| -53% | -$286K |
|
3955
PUT
Ondas Inc
ONDS
$4.48B
| $331K | ﹤0.01% |
172,400
+143,600
| +499% | +$160K |
|
3956
PUT
Sally Beauty Holdings
SBH
$1.48B
| $331K | ﹤0.01% |
35,800
-100
| -0.3% | -$862 |
|
|
OS
3957
PUT
DELISTED
OneStream Inc
OS
| $331K | ﹤0.01% |
11,700
+8,300
| +244% | +$207K |
|
3958
CALL
Brixmor Property Group
BRX
$9.77B
| $330K | ﹤0.01% |
12,700
+400
| +3% | +$10.2K |
|
3959
PUT
International Flavors & Fragrances
IFF
$20.2B
| $330K | ﹤0.01% |
4,500
-6,100
| -58% | -$461K |
|
3960
Invesco
IVZ
$13B
| $330K | ﹤0.01% |
20,952
+6,362
| +44% | +$91.4K |
|
3961
PUT
Methode Electronics
MEI
$525M
| $330K | ﹤0.01% |
34,800
+33,300
| +2,220% | +$245K |
|
3962
PUT
Enviri
NVRI
$623M
| $330K | ﹤0.01% |
38,100
-46,100
| -55% | -$338K |
|
3963
PUT
Essential Utilities
WTRG
$11.5B
| $330K | ﹤0.01% |
8,900
+8,700
| +4,350% | +$339K |
|
3964
CALL
American Battery Technology Co
ABAT
$297M
| $329K | ﹤0.01% |
203,200
-229,900
| -53% | -$298K |
|
3965
PUT
Cogent Biosciences
COGT
$6.95B
| $329K | ﹤0.01% |
+45,900
| New | +$254K |
|
|
JMIA
3966
PUT
Jumia Technologies
JMIA
$741M
| $329K | ﹤0.01% |
82,000
+23,600
| +40% | +$66.7K |
|
3967
CALL
Acuity Brands
AYI
$10.3B
| $328K | ﹤0.01% |
1,100
-2,300
| -68% | -$595K |
|
|
EFC
3968
PUT
Ellington Financial
EFC
$1.7B
| $328K | ﹤0.01% |
25,300
+21,600
| +584% | +$275K |
|
3969
CALL
Interparfums
IPAR
$4.09B
| $328K | ﹤0.01% |
2,500
+100
| +4% | +$12.2K |
|
3970
Sinclair Inc
SBGI
$1.02B
| $328K | ﹤0.01% |
+23,798
| New | +$338K |
|
|
SHCO
3971
DELISTED
Soho House & Co
SHCO
| $328K | ﹤0.01% |
44,735
+15,973
| +56% | +$99.2K |
|
3972
CALL
SM Energy
SM
$7.11B
| $328K | ﹤0.01% |
13,300
-10,900
| -45% | -$264K |
|
3973
PUT
Thor Industries
THO
$4.13B
| $328K | ﹤0.01% |
3,700
-35,000
| -90% | -$2.76M |
|
|
FFAI
3974
CALL
Faraday Future Intelligent Electric
FFAI
$11.9M
| $328K | ﹤0.01% |
1,302
-362
| -22% | -$66.5K |
|
3975
Vanguard Tax-Exempt Bond Index Fund
VTEB
$45.3B
| $327K | ﹤0.01% |
6,670
+4,696
| +238% | +$229K |
|
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.