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 | |
|---|---|---|---|---|---|---|
|
SA
1826
CALL
Seabridge Gold
SA
$2.8B
| $2.76M | ﹤0.01% |
190,300
+8,200
| +5% | +$104K |
|
1827
CALL
Kimbell Royalty Partners
KRP
$1.47B
| $2.76M | ﹤0.01% |
197,900
-24,300
| -11% | -$318K |
|
1828
PUT
Alcon
ALC
$33.1B
| $2.75M | ﹤0.01% |
31,200
+18,200
| +140% | +$1.63M |
|
1829
CALL
Pitney Bowes
PBI
$2.42B
| $2.75M | ﹤0.01% |
252,300
+48,000
| +23% | +$452K |
|
1830
CALL
Root
ROOT
$917M
| $2.75M | ﹤0.01% |
21,500
-1,700
| -7% | -$230K |
|
1831
Viking Therapeutics
VKTX
$4.04B
| $2.75M | ﹤0.01% |
103,820
-18,935
| -15% | -$498K |
|
|
INFA
1832
CALL
DELISTED
Informatica
INFA
| $2.75M | ﹤0.01% |
112,900
+102,500
| +986% | +$2.11M |
|
1833
CALL
AvalonBay Communities
AVB
$27.1B
| $2.75M | ﹤0.01% |
13,500
+5,300
| +65% | +$1.08M |
|
1834
Energy Fuels
UUUU
$2.82B
| $2.75M | ﹤0.01% |
477,576
+90,337
| +23% | +$434K |
|
1835
PUT
Leidos
LDOS
$14.1B
| $2.75M | ﹤0.01% |
17,400
-7,200
| -29% | -$1.06M |
|
|
NGD
1836
CALL
DELISTED
New Gold Inc
NGD
| $2.74M | ﹤0.01% |
554,000
-62,000
| -10% | -$255K |
|
1837
Marathon Petroleum
MPC
$90.3B
| $2.74M | ﹤0.01% |
16,498
-2,128
| -11% | -$319K |
|
|
XIFR
1838
PUT
XPLR Infrastructure LP
XIFR
$1.18B
| $2.73M | ﹤0.01% |
333,200
-44,400
| -12% | -$386K |
|
1839
PUT
FMC
FMC
$1.42B
| $2.73M | ﹤0.01% |
65,300
-45,400
| -41% | -$1.8M |
|
1840
CALL
PagSeguro Digital
PAGS
$2.57B
| $2.72M | ﹤0.01% |
282,600
-28,700
| -9% | -$259K |
|
1841
PUT
Evolv Technologies
EVLV
$943M
| $2.72M | ﹤0.01% |
436,000
+309,400
| +244% | +$1.43M |
|
1842
PUT
Ross Stores
ROST
$76.6B
| $2.72M | ﹤0.01% |
21,300
-15,200
| -42% | -$2.11M |
|
1843
PUT
Bruker
BRKR
$9.2B
| $2.71M | ﹤0.01% |
65,900
-1,000
| -1% | -$38.6K |
|
1844
CALL
Raymond James Financial
RJF
$32.5B
| $2.71M | ﹤0.01% |
17,700
-6,400
| -27% | -$916K |
|
1845
PUT
BCE
BCE
$19.9B
| $2.71M | ﹤0.01% |
122,400
+26,500
| +28% | +$580K |
|
|
UCD
1846
PUT
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $2.71M | ﹤0.01% |
65,900
+2,000
| +3% | +$82.3K |
|
1847
PUT
Yeti Holdings
YETI
$3.82B
| $2.71M | ﹤0.01% |
86,000
+31,700
| +58% | +$951K |
|
1848
PUT
FTAI Infrastructure
FIP
$500M
| $2.71M | ﹤0.01% |
439,100
+438,600
| +87,720% | +$2.22M |
|
1849
PUT
Lithia Motors
LAD
$7.78B
| $2.7M | ﹤0.01% |
8,000
-20,800
| -72% | -$6.43M |
|
1850
PUT
ZTO Express
ZTO
$18.2B
| $2.7M | ﹤0.01% |
152,000
-49,100
| -24% | -$889K |
|
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.