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 | |
|---|---|---|---|---|---|---|
2201
PUT
Shift4
FOUR
$3.84B
| $1.82M | ﹤0.01% |
18,400
-57,100
| -76% | -$4.98M |
|
2202
CALL
Genesis Energy
GEL
$1.84B
| $1.82M | ﹤0.01% |
105,700
-21,200
| -17% | -$321K |
|
2203
PUT
Charles River Laboratories
CRL
$10.9B
| $1.82M | ﹤0.01% |
12,000
+4,400
| +58% | +$587K |
|
2204
CALL
Commercial Metals
CMC
$7.63B
| $1.81M | ﹤0.01% |
37,100
-67,800
| -65% | -$3.14M |
|
2205
PUT
Urban Outfitters
URBN
$5.99B
| $1.81M | ﹤0.01% |
25,000
+14,200
| +131% | +$853K |
|
2206
Blackstone Mortgage Trust
BXMT
$2.82B
| $1.81M | ﹤0.01% |
94,078
+3,940
| +4% | +$74.7K |
|
|
MRP
2207
PUT
Millrose Properties Inc
MRP
$4.74B
| $1.81M | ﹤0.01% |
63,500
-104,500
| -62% | -$2.76M |
|
2208
Targa Resources
TRGP
$60.4B
| $1.81M | ﹤0.01% |
+10,377
| New | +$1.74M |
|
2209
PUT
Keurig Dr Pepper
KDP
$40.4B
| $1.8M | ﹤0.01% |
54,600
-317,400
| -85% | -$10.7M |
|
2210
Magna International
MGA
$17.9B
| $1.8M | ﹤0.01% |
46,586
-8,032
| -15% | -$284K |
|
2211
CALL
Markel Group
MKL
$25B
| $1.8M | ﹤0.01% |
900
+400
| +80% | +$750K |
|
2212
PUT
Genuine Parts
GPC
$17.1B
| $1.79M | ﹤0.01% |
14,800
-5,800
| -28% | -$698K |
|
2213
Kodak
KODK
$806M
| $1.79M | ﹤0.01% |
317,851
+87,703
| +38% | +$527K |
|
|
SNV
2214
CALL
DELISTED
Synovus
SNV
| $1.79M | ﹤0.01% |
34,700
+12,300
| +55% | +$565K |
|
2215
CALL
Iron Mountain
IRM
$38.2B
| $1.79M | ﹤0.01% |
17,500
-81,800
| -82% | -$7.71M |
|
2216
iShares US Aerospace & Defense ETF
ITA
$14.2B
| $1.79M | ﹤0.01% |
9,514
-389
| -4% | -$64.6K |
|
2217
PUT
Aramark
ARMK
$15B
| $1.79M | ﹤0.01% |
42,800
+22,400
| +110% | +$832K |
|
2218
PUT
BellRing Brands
BRBR
$1.51B
| $1.79M | ﹤0.01% |
30,900
+27,900
| +930% | +$1.86M |
|
2219
CALL
Red Rock Resorts
RRR
$3.74B
| $1.78M | ﹤0.01% |
34,300
+5,900
| +21% | +$270K |
|
2220
PUT
Kyndryl
KD
$2.66B
| $1.78M | ﹤0.01% |
42,500
-92,600
| -69% | -$3.35M |
|
2221
Direxion Daily S&P 500 Bull 3x ETF
SPXL
$6.58B
| $1.78M | ﹤0.01% |
+10,277
| New | +$1.45M |
|
2222
CALL
Qfin Holdings
QFIN
$1.61B
| $1.78M | ﹤0.01% |
41,100
-6,400
| -13% | -$267K |
|
|
JPGE
2223
PUT
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $1.78M | ﹤0.01% |
31,200
-10,300
| -25% | -$588K |
|
2224
CALL
iShares Convertible Bond ETF
ICVT
$7.23B
| $1.78M | ﹤0.01% |
54,900
-11,500
| -17% | -$986K |
|
2225
CALL
Illinois Tool Works
ITW
$81.4B
| $1.78M | ﹤0.01% |
7,200
-12,800
| -64% | -$3.09M |
|
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.