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 | |
|---|---|---|---|---|---|---|
5376
PUT
Camping World
CWH
$386M
| $87K | ﹤0.01% |
5,100
-700
| -12% | -$10.9K |
|
5377
Forward Air
FWRD
$446M
| $87K | ﹤0.01% |
+3,563
| New | +$63.3K |
|
5378
CALL
James River Group Holdings
JRVR
$203M
| $87K | ﹤0.01% |
+15,000
| New | +$76.1K |
|
5379
PUT
Mercury Insurance
MCY
$5.92B
| $87K | ﹤0.01% |
1,300
-11,200
| -90% | -$666K |
|
5380
NCR Atleos
NATL
$3.44B
| $87K | ﹤0.01% |
3,077
+1,535
| +100% | +$41.4K |
|
|
NNDM
5381
CALL
Nano Dimension
NNDM
$322M
| $87K | ﹤0.01% |
53,900
-93,000
| -63% | -$142K |
|
5382
VanEck Rare Earth/Strategic Metals ETF
REMX
$1.94B
| $87K | ﹤0.01% |
+2,145
| New | +$81.9K |
|
5383
Spero Therapeutics
SPRO
$68.9M
| $87K | ﹤0.01% |
30,322
+25,224
| +495% | +$36.3K |
|
5384
Atour Lifestyle Holdings
ATAT
$4.69B
| $86K | ﹤0.01% |
+2,670
| New | +$75.9K |
|
5385
Bausch Health
BHC
$2.45B
| $86K | ﹤0.01% |
13,027
-56,203
| -81% | -$289K |
|
5386
CALL
Ezcorp Inc
EZPW
$1.83B
| $86K | ﹤0.01% |
6,200
-2,800
| -31% | -$40.5K |
|
5387
CALL
Griffon
GFF
$3.97B
| $86K | ﹤0.01% |
1,200
+300
| +33% | +$20.9K |
|
5388
CALL
Integer Holdings
ITGR
$3.41B
| $86K | ﹤0.01% |
700
-1,400
| -67% | -$167K |
|
5389
CALL
NewtekOne
NEWT
$421M
| $86K | ﹤0.01% |
7,700
-3,400
| -31% | -$36.3K |
|
5390
CALL
OneSpan
OSPN
$562M
| $86K | ﹤0.01% |
5,200
-8,800
| -63% | -$137K |
|
5391
PUT
Perma-Fix Environmental Services
PESI
$350M
| $86K | ﹤0.01% |
8,200
-5,700
| -41% | -$52.4K |
|
5392
PUT
Preferred Bank
PFBC
$1.23B
| $86K | ﹤0.01% |
+1,000
| New | +$82.4K |
|
|
RVPH
5393
DELISTED
REVIVA PHARMA HLDGS INC
RVPH
| $86K | ﹤0.01% |
+11,403
| New | +$178K |
|
5394
PUT
Millicom
TIGO
$15.9B
| $86K | ﹤0.01% |
+2,300
| New | +$78.8K |
|
5395
Vanguard Morningstar Mid-Cap Value ETF
VOE
$23.7B
| $86K | ﹤0.01% |
+528
| New | +$83.6K |
|
|
ZK
5396
DELISTED
Zeekr
ZK
| $86K | ﹤0.01% |
3,409
-39,767
| -92% | -$980K |
|
5397
CALL
Ashland
ASH
$3.29B
| $85K | ﹤0.01% |
1,700
-300
| -15% | -$15.3K |
|
5398
PUT
Corporacion America
CAAP
$4.23B
| $85K | ﹤0.01% |
4,200
+100
| +2% | +$1.97K |
|
5399
CALL
Federal Signal
FSS
$7.55B
| $85K | ﹤0.01% |
+800
| New | +$71.3K |
|
5400
PUT
Arena Group
AREN
$56.2M
| $84K | ﹤0.01% |
+13,600
| New | +$66.8K |
|
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.