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 | |
|---|---|---|---|---|---|---|
3076
CALL
Amer Sports
AS
$20.5B
| $759K | ﹤0.01% |
19,600
-6,100
| -24% | -$188K |
|
3077
CALL
Ramaco Resources Class A
METC
$647M
| $758K | ﹤0.01% |
57,700
-17,084
| -23% | -$163K |
|
3078
Starwood Property Trust
STWD
$6.18B
| $758K | ﹤0.01% |
37,788
-20,061
| -35% | -$390K |
|
3079
PUT
Powell Industries
POWL
$7.83B
| $757K | ﹤0.01% |
10,800
-23,700
| -69% | -$1.43M |
|
3080
Thermo Fisher Scientific
TMO
$210B
| $757K | ﹤0.01% |
1,869
-4,375
| -70% | -$1.83M |
|
3081
CALL
Apple Hospitality REIT
APLE
$3.97B
| $755K | ﹤0.01% |
64,700
+2,200
| +4% | +$25.8K |
|
3082
PUT
Petco
WOOF
$768M
| $755K | ﹤0.01% |
266,900
-23,700
| -8% | -$73.7K |
|
|
DFDV
3083
CALL
DeFi Development Corp
DFDV
$82.5M
| $754K | ﹤0.01% |
+38,720
| New | +$557K |
|
3084
PUT
PVH
PVH
$3.83B
| $754K | ﹤0.01% |
11,000
+3,500
| +47% | +$254K |
|
|
ONT
3085
PUT
Onterris Inc
ONT
$721M
| $753K | ﹤0.01% |
34,400
-36,900
| -52% | -$662K |
|
3086
Fulcrum Therapeutics
FULC
$250M
| $752K | ﹤0.01% |
109,365
+106,339
| +3,514% | +$569K |
|
3087
CALL
Otis Worldwide
OTIS
$28B
| $752K | ﹤0.01% |
7,600
-400
| -5% | -$38.6K |
|
3088
PUT
Celldex Therapeutics
CLDX
$2.78B
| $750K | ﹤0.01% |
36,900
-100
| -0.3% | -$1.95K |
|
3089
CALL
ReNew
RNW
$2.21B
| $750K | ﹤0.01% |
108,600
+7,200
| +7% | +$47K |
|
3090
Cummins
CMI
$88.9B
| $749K | ﹤0.01% |
2,288
-1,195
| -34% | -$370K |
|
3091
CALL
Kemper
KMPR
$1.75B
| $748K | ﹤0.01% |
11,600
+11,500
| +11,500% | +$712K |
|
3092
PUT
Winnebago Industries
WGO
$880M
| $748K | ﹤0.01% |
25,800
-10,200
| -28% | -$334K |
|
3093
CALL
Wolfspeed
WOLF
$1.16B
| $747K | ﹤0.01% |
1,873,000
+90,000
| +5% | +$205K |
|
|
FYBR
3094
PUT
DELISTED
Frontier Communications
FYBR
| $746K | ﹤0.01% |
20,500
+2,700
| +15% | +$97.9K |
|
3095
Rexford Industrial Realty
REXR
$8.72B
| $745K | ﹤0.01% |
+20,971
| New | +$732K |
|
|
MBX
3096
PUT
MBX Biosciences
MBX
$2.98B
| $745K | ﹤0.01% |
+65,300
| New | +$665K |
|
3097
EPAM Systems
EPAM
$4.86B
| $744K | ﹤0.01% |
4,210
-678
| -14% | -$113K |
|
3098
CALL
Molina Healthcare
MOH
$10.5B
| $744K | ﹤0.01% |
2,500
-1,300
| -34% | -$408K |
|
3099
Edwards Lifesciences
EW
$47.2B
| $743K | ﹤0.01% |
+9,510
| New | +$709K |
|
3100
PUT
Natera
NTRA
$37.3B
| $743K | ﹤0.01% |
4,400
-47,800
| -92% | -$7.45M |
|
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.