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 | |
|---|---|---|---|---|---|---|
4176
PUT
Palomar
PLMR
$3.77B
| $277K | ﹤0.01% |
1,800
+1,700
| +1,700% | +$263K |
|
4177
PUT
Tandem Diabetes Care
TNDM
$1.27B
| $277K | ﹤0.01% |
14,900
+11,600
| +352% | +$230K |
|
|
FARO
4178
CALL
DELISTED
Faro Technologies
FARO
| $276K | ﹤0.01% |
6,300
+5,800
| +1,160% | +$212K |
|
4179
H.B. Fuller
FUL
$2.97B
| $276K | ﹤0.01% |
4,601
+4,226
| +1,127% | +$233K |
|
|
RZLV
4180
CALL
Rezolve AI
RZLV
$897M
| $276K | ﹤0.01% |
89,900
+87,200
| +3,230% | +$172K |
|
4181
CALL
National Grid
NGG
$79.3B
| $275K | ﹤0.01% |
3,753
+1,247
| +50% | +$85.7K |
|
|
VTYX
4182
DELISTED
Ventyx Biosciences
VTYX
| $275K | ﹤0.01% |
128,904
+126,391
| +5,029% | +$204K |
|
|
ALMS
4183
Alumis Inc
ALMS
$3.36B
| $275K | ﹤0.01% |
+91,698
| New | +$433K |
|
|
AGEN
4184
CALL
Agenus
AGEN
$280M
| $274K | ﹤0.01% |
60,100
+32,900
| +121% | +$114K |
|
|
DVAX
4185
CALL
DELISTED
Dynavax Technologies
DVAX
| $274K | ﹤0.01% |
27,700
-4,000
| -13% | -$42.1K |
|
4186
CALL
Warrior Met Coal
HCC
$4.16B
| $274K | ﹤0.01% |
6,000
-3,300
| -35% | -$153K |
|
4187
CALL
US Gold Corp
USAU
$213M
| $274K | ﹤0.01% |
22,500
+12,100
| +116% | +$133K |
|
4188
Evolus
EOLS
$392M
| $273K | ﹤0.01% |
29,750
+18,152
| +157% | +$186K |
|
4189
PUT
Cedar Fair
FUN
$1.88B
| $273K | ﹤0.01% |
9,000
+8,000
| +800% | +$268K |
|
4190
CALL
International Seaways
INSW
$4.7B
| $273K | ﹤0.01% |
7,500
-600
| -7% | -$21.5K |
|
4191
CALL
KBR
KBR
$4.53B
| $273K | ﹤0.01% |
5,700
-33,900
| -86% | -$1.76M |
|
4192
CALL
SkinHealth Systems
SKIN
$84.9M
| $272K | ﹤0.01% |
142,900
+126,500
| +771% | +$178K |
|
4193
CALL
Atlanta Braves Holdings Series B
BATRK
$3.28B
| $271K | ﹤0.01% |
5,800
+2,800
| +93% | +$114K |
|
|
MFA
4194
MFA Financial
MFA
$931M
| $271K | ﹤0.01% |
28,702
+28,197
| +5,584% | +$266K |
|
4195
CALL
abrdn Physical Palladium Shares ETF
PALL
$613M
| $271K | ﹤0.01% |
13,500
+7,000
| +108% | +$126K |
|
4196
CALL
Sonos
SONO
$2.09B
| $271K | ﹤0.01% |
25,100
+10,100
| +67% | +$98.3K |
|
4197
PUT
China Yuchai International
CYD
$1.7B
| $270K | ﹤0.01% |
11,300
-500
| -4% | -$8.78K |
|
|
BCPC
4198
CALL
Balchem Corp
BCPC
$5.27B
| $270K | ﹤0.01% |
1,700
+200
| +13% | +$32.4K |
|
4199
CALL
Bain Capital Specialty
BCSF
$820M
| $269K | ﹤0.01% |
17,900
-18,400
| -51% | -$281K |
|
4200
Simon Property Group
SPG
$76.2B
| $269K | ﹤0.01% |
1,679
-9,483
| -85% | -$1.5M |
|
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.