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 | |
|---|---|---|---|---|---|---|
|
CVGW
5101
PUT
DELISTED
Calavo Growers
CVGW
| $114K | ﹤0.01% |
4,300
+3,900
| +975% | +$102K |
|
5102
PUT
Invesco CurrencyShares Canadian Dollar Trust
FXC
$73.2M
| $114K | ﹤0.01% |
1,600
-5,500
| -77% | -$388K |
|
|
NUVL
5103
PUT
DELISTED
Nuvalent
NUVL
| $114K | ﹤0.01% |
1,500
-100
| -6% | -$7.32K |
|
5104
GraniteShares 2x Long MSFT Daily ETF
MSFL
$160M
| $114K | ﹤0.01% |
3,799
+3,585
| +1,675% | +$84.1K |
|
|
SAIL
5105
CALL
SailPoint Inc
SAIL
$9.17B
| $114K | ﹤0.01% |
5,000
+4,300
| +614% | +$81.2K |
|
|
AGNT
5106
AGNT Inc
AGNT
$641M
| $113K | ﹤0.01% |
+12,503
| New | +$109K |
|
5107
Haleon
HLN
$44.5B
| $113K | ﹤0.01% |
+10,913
| New | +$115K |
|
5108
PUT
Nuvectis Pharma
NVCT
$718M
| $113K | ﹤0.01% |
15,200
+11,200
| +280% | +$102K |
|
5109
PUT
PetMed Express
PETS
$42.3M
| $113K | ﹤0.01% |
34,100
+25,600
| +301% | +$91.2K |
|
5110
CALL
Packaging Corp of America
PKG
$22.2B
| $113K | ﹤0.01% |
600
-9,400
| -94% | -$1.78M |
|
5111
CALL
Sportsman's Warehouse
SPWH
$45.3M
| $113K | ﹤0.01% |
+32,800
| New | +$73.5K |
|
5112
ProShares Supply Chain Logistics ETF
SUPL
$2.32M
| $113K | ﹤0.01% |
+3,002
| New | +$109K |
|
5113
PUT
Gentherm
THRM
$1.3B
| $113K | ﹤0.01% |
4,000
+2,400
| +150% | +$63.7K |
|
|
XNET
5114
Xunlei
XNET
$360M
| $113K | ﹤0.01% |
28,001
-40,376
| -59% | -$187K |
|
|
ZEPP
5115
Zepp Health
ZEPP
$64.8M
| $113K | ﹤0.01% |
42,554
+8,551
| +25% | +$21.9K |
|
5116
PUT
Ibotta
IBTA
$614M
| $113K | ﹤0.01% |
3,100
-100
| -3% | -$4.67K |
|
5117
PUT
Arcutis Biotherapeutics
ARQT
$3.5B
| $112K | ﹤0.01% |
8,000
-7,300
| -48% | -$102K |
|
5118
PUT
Camden Property Trust
CPT
$11.2B
| $112K | ﹤0.01% |
1,000
-3,200
| -76% | -$369K |
|
5119
PUT
Embecta
EMBC
$217M
| $112K | ﹤0.01% |
11,600
+7,200
| +164% | +$81K |
|
5120
Kingstone Companies
KINS
$293M
| $112K | ﹤0.01% |
7,289
+5,897
| +424% | +$97.8K |
|
5121
Petrobras Class A
PBR.A
$109B
| $112K | ﹤0.01% |
+9,767
| New | +$109K |
|
5122
Schrodinger
SDGR
$1.15B
| $112K | ﹤0.01% |
+5,594
| New | +$128K |
|
5123
Armstrong World Industries
AWI
$7.37B
| $111K | ﹤0.01% |
687
+362
| +111% | +$53.8K |
|
5124
Breakwave Dry Bulk Shipping ETF
BDRY
$29.4M
| $111K | ﹤0.01% |
20,146
+10,213
| +103% | +$57.1K |
|
5125
CALL
Certara
CERT
$1.21B
| $111K | ﹤0.01% |
9,500
+4,300
| +83% | +$50.9K |
|
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.