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 | |
|---|---|---|---|---|---|---|
3301
Hannon Armstrong Sustainable Infrastructure Capital
HASI
$4.91B
| $604K | ﹤0.01% |
+22,502
| New | +$583K |
|
3302
CALL
Microbot Medical
MBOT
$117M
| $604K | ﹤0.01% |
239,700
+166,400
| +227% | +$398K |
|
|
ETH
3303
PUT
Grayscale Ethereum Staking Mini ETF Shares
ETH
$1.78B
| $604K | ﹤0.01% |
+25,500
| New | +$527K |
|
3304
CALL
Arrowhead Research
ARWR
$12B
| $603K | ﹤0.01% |
38,200
+6,400
| +20% | +$91.8K |
|
|
ECHO
3305
EchoStar
ECHO
$25.1B
| $603K | ﹤0.01% |
21,791
-8,435
| -28% | -$185K |
|
3306
CALL
Marqeta
MQ
$1.85B
| $602K | ﹤0.01% |
25,850
+20,225
| +360% | +$384K |
|
3307
PUT
Microvast
MVST
$267M
| $602K | ﹤0.01% |
165,900
+11,000
| +7% | +$32.2K |
|
|
TEN
3308
PUT
Tsakos Energy Navigation Ltd
TEN
$1.18B
| $602K | ﹤0.01% |
31,400
-3,100
| -9% | -$54.4K |
|
3309
PUT
Arcos Dorados Holdings
ARCO
$1.75B
| $601K | ﹤0.01% |
76,200
+73,600
| +2,831% | +$557K |
|
3310
PUT
Rexford Industrial Realty
REXR
$8.63B
| $601K | ﹤0.01% |
16,900
+1,800
| +12% | +$62.8K |
|
3311
PUT
Seadrill
SDRL
$2.69B
| $601K | ﹤0.01% |
22,900
+21,800
| +1,982% | +$514K |
|
|
SVM
3312
Silvercorp Metals
SVM
$2.16B
| $601K | ﹤0.01% |
142,602
+91,622
| +180% | +$355K |
|
3313
CALL
Impinj
PI
$3.97B
| $599K | ﹤0.01% |
5,400
-400
| -7% | -$39.8K |
|
3314
Direxion Daily Regional Banks Bull 3X ETF
DPST
$454M
| $597K | ﹤0.01% |
6,887
+1,616
| +31% | +$119K |
|
3315
PUT
TripAdvisor
TRIP
$1.66B
| $597K | ﹤0.01% |
45,800
-307,400
| -87% | -$4.11M |
|
3316
CALL
Flowserve
FLS
$9.29B
| $596K | ﹤0.01% |
11,400
-7,700
| -40% | -$362K |
|
3317
CALL
Molson Coors Class B
TAP
$7.71B
| $596K | ﹤0.01% |
12,400
-18,100
| -59% | -$997K |
|
3318
PUT
First Watch Restaurant Group
FWRG
$794M
| $595K | ﹤0.01% |
+37,100
| New | +$623K |
|
3319
CALL
Genworth Financial
GNW
$3.79B
| $595K | ﹤0.01% |
76,500
+30,300
| +66% | +$212K |
|
3320
PUT
dLocal
DLO
$4.4B
| $593K | ﹤0.01% |
52,300
+14,600
| +39% | +$144K |
|
3321
CALL
FS KKR Capital
FSK
$3.04B
| $593K | ﹤0.01% |
28,600
+4,200
| +17% | +$85.6K |
|
3322
PUT
Illinois Tool Works
ITW
$81.9B
| $593K | ﹤0.01% |
2,400
+300
| +14% | +$72.5K |
|
3323
CALL
Patterson-UTI
PTEN
$3.57B
| $593K | ﹤0.01% |
100,100
+30,900
| +45% | +$186K |
|
|
CRON
3324
CALL
Cronos Group
CRON
$1.07B
| $592K | ﹤0.01% |
310,100
-175,300
| -36% | -$332K |
|
3325
TE Connectivity
TEL
$60.2B
| $590K | ﹤0.01% |
3,500
-8,615
| -71% | -$1.31M |
|
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.