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 | |
|---|---|---|---|---|---|---|
2926
CALL
Teekay
TK
$975M
| $858K | ﹤0.01% |
104,000
+90,200
| +654% | +$699K |
|
2927
NiSource
NI
$22.4B
| $857K | ﹤0.01% |
21,246
-8,456
| -28% | -$332K |
|
2928
CALL
Amprius Technologies
AMPX
$1.31B
| $854K | ﹤0.01% |
202,900
-43,400
| -18% | -$122K |
|
2929
CALL
Beyond Meat
BYND
$288M
| $854K | ﹤0.01% |
244,800
+30,500
| +14% | +$88.3K |
|
2930
CALL
Elbit Systems
ESLT
$38.4B
| $854K | ﹤0.01% |
1,900
+900
| +90% | +$365K |
|
2931
CALL
Fabrinet
FN
$17.1B
| $854K | ﹤0.01% |
2,900
+1,900
| +190% | +$423K |
|
|
RDFN
2932
CALL
DELISTED
Redfin
RDFN
| $854K | ﹤0.01% |
181,800
-94,400
| -34% | -$926K |
|
|
GDEN
2933
CALL
DELISTED
Golden Entertainment
GDEN
| $853K | ﹤0.01% |
29,000
+21,000
| +263% | +$572K |
|
2934
CALL
Iridium Communications
IRDM
$4.85B
| $853K | ﹤0.01% |
28,300
-29,300
| -51% | -$762K |
|
|
VISN
2935
CALL
Vistance Networks Inc
VISN
$2.66B
| $852K | ﹤0.01% |
103,000
+31,100
| +43% | +$163K |
|
2936
Saia
SAIA
$11.3B
| $852K | ﹤0.01% |
3,110
+3,021
| +3,394% | +$861K |
|
2937
CALL
KB Financial Group
KB
$41.2B
| $850K | ﹤0.01% |
+10,300
| New | +$696K |
|
|
GOOS
2938
PUT
Canada Goose Holdings
GOOS
$868M
| $849K | ﹤0.01% |
75,900
+67,300
| +783% | +$652K |
|
2939
CALL
Veeco
VECO
$3.15B
| $849K | ﹤0.01% |
41,800
+26,800
| +179% | +$529K |
|
2940
CALL
American Water Works
AWK
$26.3B
| $848K | ﹤0.01% |
6,100
-23,700
| -80% | -$3.4M |
|
2941
SL Green Realty
SLG
$3.88B
| $848K | ﹤0.01% |
13,712
+4,048
| +42% | +$232K |
|
2942
CALL
Target Hospitality
TH
$1.61B
| $848K | ﹤0.01% |
119,200
-66,100
| -36% | -$459K |
|
2943
CALL
FerroAtlántica
GSM
$628M
| $847K | ﹤0.01% |
230,800
-54,600
| -19% | -$200K |
|
2944
Cboe Global Markets
CBOE
$29.8B
| $846K | ﹤0.01% |
3,628
+2,699
| +291% | +$601K |
|
2945
PUT
Forward Air
FWRD
$482M
| $844K | ﹤0.01% |
34,400
+13,300
| +63% | +$236K |
|
2946
Direxion Daily Technology Bull 3x ETF
TECL
$5.14B
| $844K | ﹤0.01% |
+9,021
| New | +$596K |
|
|
ETHE
2947
Grayscale Ethereum Staking ETF Shares
ETHE
$1.51B
| $844K | ﹤0.01% |
+40,473
| New | +$738K |
|
2948
CALL
Ollie's Bargain Outlet
OLLI
$4.01B
| $843K | ﹤0.01% |
6,400
-10,300
| -62% | -$1.18M |
|
|
WRD
2949
CALL
WeRide Inc
WRD
$1.75B
| $843K | ﹤0.01% |
+107,100
| New | +$955K |
|
2950
Atlas Energy Solutions
AESI
$1.49B
| $842K | ﹤0.01% |
+63,047
| New | +$861K |
|
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.