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 | |
|---|---|---|---|---|---|---|
3026
PUT
Sphere Entertainment
SPHR
$4.88B
| $794K | ﹤0.01% |
19,000
-28,700
| -60% | -$972K |
|
3027
CALL
UL Solutions
ULS
$17.2B
| $794K | ﹤0.01% |
10,900
+4,500
| +70% | +$295K |
|
|
HPP
3028
Hudson Pacific Properties
HPP
$834M
| $793K | ﹤0.01% |
41,384
+30,562
| +282% | +$496K |
|
3029
PUT
Roper Technologies
ROP
$36.3B
| $793K | ﹤0.01% |
1,400
+100
| +8% | +$56.5K |
|
3030
Alpha Metallurgical Resources
AMR
$1.82B
| $792K | ﹤0.01% |
7,046
+4,901
| +228% | +$573K |
|
|
JMIA
3031
CALL
Jumia Technologies
JMIA
$726M
| $792K | ﹤0.01% |
197,100
+70,600
| +56% | +$199K |
|
3032
PUT
Public Storage
PSA
$60.2B
| $792K | ﹤0.01% |
2,700
+1,200
| +80% | +$355K |
|
3033
CALL
ASP Isotopes
ASPI
$487M
| $790K | ﹤0.01% |
107,400
-101,200
| -49% | -$679K |
|
3034
PUT
Worthington Steel
WS
$1.8B
| $790K | ﹤0.01% |
26,500
+25,400
| +2,309% | +$654K |
|
3035
Wolverine World Wide
WWW
$1.54B
| $788K | ﹤0.01% |
43,586
-16,153
| -27% | -$246K |
|
3036
PUT
Halozyme
HALO
$9.72B
| $785K | ﹤0.01% |
15,100
+4,300
| +40% | +$245K |
|
3037
PUT
HUB Group
HUBG
$3.01B
| $785K | ﹤0.01% |
23,500
+23,100
| +5,775% | +$775K |
|
3038
Ingredion
INGR
$6.38B
| $784K | ﹤0.01% |
5,781
-749
| -11% | -$101K |
|
3039
PUT
Fomento Económico Mexicano
FMX
$43.3B
| $783K | ﹤0.01% |
8,500
+4,900
| +136% | +$506K |
|
|
TTAN
3040
PUT
ServiceTitan Inc
TTAN
$6.72B
| $782K | ﹤0.01% |
7,300
+4,100
| +128% | +$458K |
|
3041
PUT
Kodiak Gas Services
KGS
$5.96B
| $781K | ﹤0.01% |
+22,800
| New | +$789K |
|
3042
CALL
Thor Industries
THO
$3.99B
| $781K | ﹤0.01% |
8,800
+1,200
| +16% | +$94.8K |
|
3043
CALL
Dentsply Sirona
XRAY
$2.59B
| $781K | ﹤0.01% |
49,200
+28,300
| +135% | +$423K |
|
3044
Bunge Global
BG
$23.6B
| $780K | ﹤0.01% |
+9,716
| New | +$765K |
|
3045
CALL
Imperial Oil
IMO
$62.1B
| $778K | ﹤0.01% |
9,800
+9,200
| +1,533% | +$657K |
|
3046
Texas Roadhouse
TXRH
$12.7B
| $778K | ﹤0.01% |
4,156
-590
| -12% | -$106K |
|
3047
PUT
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $778K | ﹤0.01% |
6,400
-500
| -7% | -$31.9K |
|
3048
Lumentum
LITE
$59.4B
| $777K | ﹤0.01% |
8,178
-3,956
| -33% | -$281K |
|
3049
Equinox Gold
EQX
$7.32B
| $775K | ﹤0.01% |
134,893
-5,246
| -4% | -$34.1K |
|
|
WNS
3050
DELISTED
WNS Holdings
WNS
| $775K | ﹤0.01% |
12,258
+10,707
| +690% | +$641K |
|
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.