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 | |
|---|---|---|---|---|---|---|
4226
CALL
Triple Flag Precious Metals
TFPM
$5.9B
| $260K | ﹤0.01% |
11,000
+8,600
| +358% | +$188K |
|
4227
CALL
Perma-Fix Environmental Services
PESI
$353M
| $259K | ﹤0.01% |
24,700
+22,500
| +1,023% | +$207K |
|
4228
Qfin Holdings
QFIN
$1.66B
| $259K | ﹤0.01% |
5,981
+435
| +8% | +$18.1K |
|
4229
PUT
Reservoir Media
RSVR
$731M
| $259K | ﹤0.01% |
+33,800
| New | +$248K |
|
4230
PUT
Simmons First National
SFNC
$3.39B
| $259K | ﹤0.01% |
13,700
+3,500
| +34% | +$65.9K |
|
|
JBIO
4231
PUT
Jade Biosciences
JBIO
$1.2B
| $258K | ﹤0.01% |
25,900
+25,309
| +4,282% | +$861K |
|
4232
PUT
Helen of Troy
HELE
$672M
| $258K | ﹤0.01% |
9,100
+5,500
| +153% | +$169K |
|
4233
CALL
Morgan Stanley Direct Lending Fund
MSDL
$1.29B
| $258K | ﹤0.01% |
+13,800
| New | +$267K |
|
4234
YieldMax NVDA Option Income Strategy ETF
NVDY
$1.34B
| $258K | ﹤0.01% |
15,386
+4,938
| +47% | +$76.5K |
|
4235
Petco
WOOF
$811M
| $258K | ﹤0.01% |
91,455
-57,578
| -39% | -$179K |
|
4236
PUT
Endava
DAVA
$153M
| $257K | ﹤0.01% |
16,800
+14,200
| +546% | +$239K |
|
4237
Delek US
DK
$3.85B
| $257K | ﹤0.01% |
12,169
-19,907
| -62% | -$334K |
|
|
DOO
4238
PUT
Bombardier Recreational Products
DOO
$4.58B
| $256K | ﹤0.01% |
5,300
-17,100
| -76% | -$675K |
|
|
EU
4239
enCore Energy
EU
$223M
| $256K | ﹤0.01% |
89,710
+68,287
| +319% | +$123K |
|
4240
GoDaddy
GDDY
$13.6B
| $256K | ﹤0.01% |
+1,422
| New | +$255K |
|
4241
Immunome
IMNM
$2.63B
| $256K | ﹤0.01% |
27,599
+15,445
| +127% | +$127K |
|
4242
CALL
A.O. Smith
AOS
$8.82B
| $255K | ﹤0.01% |
3,900
+1,400
| +56% | +$91.6K |
|
4243
CALL
Casey's General Stores
CASY
$31.7B
| $255K | ﹤0.01% |
500
-1,300
| -72% | -$599K |
|
4244
Enviri
NVRI
$623M
| $255K | ﹤0.01% |
29,395
-34,198
| -54% | -$251K |
|
4245
Tango Therapeutics
TNGX
$4.34B
| $255K | ﹤0.01% |
+49,901
| New | +$123K |
|
|
AIV
4246
Aimco
AIV
$375M
| $254K | ﹤0.01% |
+29,369
| New | +$238K |
|
4247
ChargePoint
CHPT
$138M
| $254K | ﹤0.01% |
18,131
+11,412
| +170% | +$153K |
|
4248
CALL
Cellebrite
CLBT
$3.7B
| $254K | ﹤0.01% |
15,900
-39,200
| -71% | -$699K |
|
4249
PUT
Grindr
GRND
$2.95B
| $254K | ﹤0.01% |
11,200
-2,700
| -19% | -$59.3K |
|
4250
CALL
Macerich
MAC
$7.52B
| $254K | ﹤0.01% |
15,700
+300
| +2% | +$4.63K |
|
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.