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 | |
|---|---|---|---|---|---|---|
2776
PUT
Innodata
INOD
$1.83B
| $998K | ﹤0.01% |
19,500
+7,000
| +56% | +$276K |
|
2777
PUT
Packaging Corp of America
PKG
$22.7B
| $998K | ﹤0.01% |
5,300
+4,800
| +960% | +$907K |
|
2778
Velocity Financial
VEL
$683M
| $998K | ﹤0.01% |
53,872
+327
| +0.6% | +$5.73K |
|
2779
PUT
Nano X Imaging
NNOX
$62.4M
| $997K | ﹤0.01% |
193,000
-53,900
| -22% | -$275K |
|
2780
CALL
Primoris Services
PRIM
$4.69B
| $997K | ﹤0.01% |
12,800
+8,900
| +228% | +$603K |
|
|
EB
2781
CALL
DELISTED
Eventbrite
EB
| $995K | ﹤0.01% |
378,400
+89,200
| +31% | +$205K |
|
2782
PUT
Jefferies Financial Group
JEF
$12.9B
| $995K | ﹤0.01% |
18,200
-43,000
| -70% | -$2.13M |
|
|
CEP
2783
DELISTED
Cantor Equity Partners
CEP
| $995K | ﹤0.01% |
+35,814
| New | +$1.09M |
|
2784
Allot
ALLT
$374M
| $993K | ﹤0.01% |
116,214
+8,067
| +7% | +$58K |
|
2785
CALL
Flex
FLEX
$43.4B
| $993K | ﹤0.01% |
19,900
+17,600
| +765% | +$686K |
|
2786
American Electric Power
AEP
$73.7B
| $992K | ﹤0.01% |
9,563
-9,829
| -51% | -$1.02M |
|
2787
Urban Outfitters
URBN
$5.99B
| $992K | ﹤0.01% |
+13,686
| New | +$822K |
|
|
NMAX
2788
CALL
Newsmax Inc
NMAX
$969M
| $992K | ﹤0.01% |
+65,600
| New | +$1.72M |
|
|
DENT
2789
CALL
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $989K | ﹤0.01% |
388,600
-226,000
| -37% | -$575K |
|
2790
PUT
Guidewire Software
GWRE
$11.5B
| $988K | ﹤0.01% |
4,200
+200
| +5% | +$43K |
|
2791
CALL
PACCAR
PCAR
$69.6B
| $988K | ﹤0.01% |
10,400
-47,500
| -82% | -$4.39M |
|
2792
Sonoco
SON
$5.76B
| $988K | ﹤0.01% |
22,689
+22,217
| +4,707% | +$994K |
|
2793
ARK Blockchain & Fintech Innovation ETF
ARKF
$718M
| $986K | ﹤0.01% |
19,626
+19,234
| +4,907% | +$758K |
|
|
GES
2794
PUT
DELISTED
Guess Inc
GES
| $986K | ﹤0.01% |
81,600
+6,100
| +8% | +$68.1K |
|
2795
Brighthouse Financial
BHF
$3.63B
| $985K | ﹤0.01% |
+18,334
| New | +$1.03M |
|
2796
CALL
HealthEquity
HQY
$7.91B
| $984K | ﹤0.01% |
9,400
+8,000
| +571% | +$758K |
|
2797
CALL
Zevra Therapeutics
ZVRA
$563M
| $984K | ﹤0.01% |
111,800
+36,400
| +48% | +$295K |
|
2798
PUT
CVR Energy
CVI
$3.36B
| $982K | ﹤0.01% |
36,600
+24,700
| +208% | +$544K |
|
2799
Mettler-Toledo International
MTD
$26.8B
| $982K | ﹤0.01% |
836
+63
| +8% | +$70.4K |
|
2800
PUT
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $982K | ﹤0.01% |
20,100
-68,400
| -77% | -$2.42M |
|
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.