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 | |
|---|---|---|---|---|---|---|
3226
CALL
Gossamer Bio
GOSS
$97.5M
| $653K | ﹤0.01% |
531,600
+173,000
| +48% | +$189K |
|
3227
PUT
Cavco Industries
CVCO
$4.46B
| $651K | ﹤0.01% |
+1,500
| New | +$703K |
|
3228
PUT
Service Corp International
SCI
$11.4B
| $651K | ﹤0.01% |
8,000
-8,400
| -51% | -$656K |
|
|
BLD
3229
CALL
DELISTED
TopBuild
BLD
| $647K | ﹤0.01% |
2,000
+1,500
| +300% | +$445K |
|
3230
PUT
Ecolab
ECL
$76.4B
| $646K | ﹤0.01% |
2,400
-22,500
| -90% | -$5.72M |
|
3231
PUT
Ericsson
ERIC
$31.8B
| $646K | ﹤0.01% |
76,200
+7,200
| +10% | +$59.2K |
|
|
MRUS
3232
CALL
DELISTED
Merus
MRUS
| $646K | ﹤0.01% |
12,300
+1,700
| +16% | +$79.9K |
|
3233
PUT
BrightSpring Health Services
BTSG
$14.1B
| $646K | ﹤0.01% |
27,400
+18,900
| +222% | +$394K |
|
3234
AMC Global Media
AMCX
$445M
| $645K | ﹤0.01% |
103,005
+83,350
| +424% | +$526K |
|
3235
PUT
Brighthouse Financial
BHF
$3.63B
| $645K | ﹤0.01% |
12,000
+7,800
| +186% | +$438K |
|
3236
PUT
JFrog
FROG
$9.84B
| $645K | ﹤0.01% |
14,700
-20,000
| -58% | -$760K |
|
3237
Hawaiian Electric Industries
HE
$2.28B
| $645K | ﹤0.01% |
60,747
+52,983
| +682% | +$553K |
|
|
TUZ
3238
CALL
DELISTED
PIMCO 1-3 Year U.S. Treasury Index Exchange-Traded Fund
TUZ
| $645K | ﹤0.01% |
11,900
-2,000
| -14% | -$108K |
|
3239
Ameriprise Financial
AMP
$47.6B
| $644K | ﹤0.01% |
+1,207
| New | +$596K |
|
3240
PUT
Simplify US Equity PLUS Convexity ETF
SPYC
$111M
| $644K | ﹤0.01% |
34,700
-3,000
| -8% | -$113K |
|
|
MURA
3241
PUT
DELISTED
Mural Oncology
MURA
| $643K | ﹤0.01% |
260,600
+229,000
| +725% | +$540K |
|
3242
Essential Utilities
WTRG
$11.2B
| $642K | ﹤0.01% |
17,295
-1,736
| -9% | -$67.6K |
|
3243
CALL
Immunome
IMNM
$2.56B
| $641K | ﹤0.01% |
69,000
+49,900
| +261% | +$409K |
|
3244
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$147B
| $640K | ﹤0.01% |
41,700
-32,900
| -44% | -$474K |
|
3245
PUT
National Grid
NGG
$81.6B
| $639K | ﹤0.01% |
8,723
+6,217
| +248% | +$427K |
|
3246
CALL
Autoliv
ALV
$8.76B
| $637K | ﹤0.01% |
5,700
-9,600
| -63% | -$940K |
|
|
KNGS
3247
PUT
DELISTED
Roundhill S&P Dividend Monarchs ETF
KNGS
| $637K | ﹤0.01% |
20,600
+15,600
| +312% | +$482K |
|
|
GRRR
3248
PUT
Gorilla Technology Group
GRRR
$337M
| $636K | ﹤0.01% |
32,000
-42,900
| -57% | -$801K |
|
3249
CALL
Globant
GLOB
$1.41B
| $635K | ﹤0.01% |
7,000
+4,400
| +169% | +$470K |
|
3250
PUT
MKS Inc
MKSI
$21.3B
| $635K | ﹤0.01% |
6,400
-5,300
| -45% | -$431K |
|
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.