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 | |
|---|---|---|---|---|---|---|
3151
CALL
Henry Schein
HSIC
$9.65B
| $708K | ﹤0.01% |
9,700
+8,100
| +506% | +$558K |
|
3152
CALL
ChargePoint
CHPT
$139M
| $706K | ﹤0.01% |
50,255
-3,495
| -7% | -$46.8K |
|
3153
PUT
Innovative Industrial Properties
IIPR
$1.79B
| $706K | ﹤0.01% |
12,800
-9,400
| -42% | -$515K |
|
3154
CALL
Innoviz Technologies
INVZ
$138M
| $706K | ﹤0.01% |
430,800
-112,300
| -21% | -$98.1K |
|
3155
PUT
Legend Biotech
LEGN
$3.7B
| $706K | ﹤0.01% |
19,900
+3,600
| +22% | +$117K |
|
3156
PUT
Lightbridge
LTBR
$265M
| $704K | ﹤0.01% |
52,700
-5,600
| -10% | -$61.8K |
|
3157
Viasat
VSAT
$10.2B
| $704K | ﹤0.01% |
48,238
-32,633
| -40% | -$330K |
|
3158
Ceragon Networks
CRNT
$197M
| $703K | ﹤0.01% |
285,892
+252,340
| +752% | +$576K |
|
3159
CALL
Pegasystems
PEGA
$4.74B
| $703K | ﹤0.01% |
13,000
-9,000
| -41% | -$408K |
|
3160
CALL
SS&C Technologies
SSNC
$18.2B
| $703K | ﹤0.01% |
8,500
+1,100
| +15% | +$86.5K |
|
|
UNIT
3161
CALL
Uniti Group
UNIT
$2.62B
| $703K | ﹤0.01% |
162,800
+1,300
| +0.8% | +$5.84K |
|
3162
Akebia Therapeutics
AKBA
$341M
| $702K | ﹤0.01% |
193,034
+54,564
| +39% | +$150K |
|
3163
PUT
Primoris Services
PRIM
$4.6B
| $701K | ﹤0.01% |
9,000
+6,700
| +291% | +$454K |
|
|
EB
3164
PUT
DELISTED
Eventbrite
EB
| $700K | ﹤0.01% |
266,400
+258,800
| +3,405% | +$596K |
|
3165
CALL
Ventas
VTR
$48.6B
| $700K | ﹤0.01% |
11,100
-17,900
| -62% | -$1.17M |
|
3166
Loar Holdings
LOAR
$6.72B
| $700K | ﹤0.01% |
+8,133
| New | +$704K |
|
3167
Cal-Maine
CALM
$4.22B
| $699K | ﹤0.01% |
7,022
-4,147
| -37% | -$396K |
|
3168
Biohaven
BHVN
$2.2B
| $698K | ﹤0.01% |
49,482
+21,754
| +78% | +$388K |
|
3169
PUT
Algoma Steel
ASTL
$463M
| $696K | ﹤0.01% |
101,100
+90,900
| +891% | +$507K |
|
3170
ProShares Short VIX Short-Term Futures ETF
SVXY
$223M
| $696K | ﹤0.01% |
+16,357
| New | +$647K |
|
|
SAND
3171
PUT
DELISTED
Sandstorm Gold
SAND
| $695K | ﹤0.01% |
74,000
+49,900
| +207% | +$427K |
|
3172
CALL
National Vision
EYE
$1.67B
| $694K | ﹤0.01% |
30,200
+22,900
| +314% | +$390K |
|
3173
CALL
Virtu Financial
VIRT
$5.18B
| $694K | ﹤0.01% |
15,500
+800
| +5% | +$32.3K |
|
3174
Direxion Daily Gold Miners Index Bear 2X ETF
DUST
$68.1M
| $692K | ﹤0.01% |
+2,808
| New | +$810K |
|
|
BZUN
3175
PUT
Baozun
BZUN
$163M
| $691K | ﹤0.01% |
276,400
+78,100
| +39% | +$216K |
|
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.