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 | |
|---|---|---|---|---|---|---|
3601
CALL
Unum
UNM
$14B
| $452K | ﹤0.01% |
5,600
-1,100
| -16% | -$86.9K |
|
3602
CALL
Ameren
AEE
$31.1B
| $451K | ﹤0.01% |
4,700
+2,500
| +114% | +$243K |
|
3603
PUT
FT Vest Gold Strategy Target Income ETF
IGLD
$505M
| $451K | ﹤0.01% |
5,700
+1,300
| +30% | +$28.1K |
|
3604
Qiagen
QGEN
$8.72B
| $450K | ﹤0.01% |
9,377
-6,356
| -40% | -$276K |
|
3605
PUT
Xperi
XPER
$368M
| $450K | ﹤0.01% |
57,000
+37,900
| +198% | +$286K |
|
3606
CALL
Banco Macro
BMA
$5.81B
| $449K | ﹤0.01% |
6,400
+1,100
| +21% | +$90.9K |
|
3607
Teucrium Wheat Fund
WEAT
$294M
| $449K | ﹤0.01% |
20,255
+3,944
| +24% | +$90.6K |
|
3608
PUT
Array Technologies
ARRY
$785M
| $448K | ﹤0.01% |
76,000
-127,600
| -63% | -$775K |
|
3609
PUT
Camtek
CAMT
$6.53B
| $448K | ﹤0.01% |
5,300
-4,900
| -48% | -$330K |
|
3610
PUT
abrdn Physical Gold Shares ETF
SGOL
$6.87B
| $447K | ﹤0.01% |
14,200
+11,500
| +426% | +$360K |
|
3611
PIMCO 25+ Year Zero Coupon US Treasury Index Exchange-Traded Fund
ZROZ
$1.37B
| $447K | ﹤0.01% |
6,671
+1,760
| +36% | +$116K |
|
3612
CALL
CDW
CDW
$18.4B
| $446K | ﹤0.01% |
2,500
-4,200
| -63% | -$713K |
|
3613
CALL
Opendoor
OPEN
$3.8B
| $446K | ﹤0.01% |
866,553
-34,514
| -4% | -$24.9K |
|
3614
CALL
Ardmore Shipping
ASC
$669M
| $445K | ﹤0.01% |
46,400
-22,900
| -33% | -$221K |
|
3615
Peabody Energy
BTU
$2.83B
| $445K | ﹤0.01% |
+33,169
| New | +$438K |
|
3616
CALL
Chord Energy
CHRD
$7.25B
| $445K | ﹤0.01% |
4,600
-8,600
| -65% | -$819K |
|
|
COOP
3617
DELISTED
Mr. Cooper
COOP
| $445K | ﹤0.01% |
+2,989
| New | +$383K |
|
3618
CALL
Invesco CurrencyShares Canadian Dollar Trust
FXC
$72.7M
| $445K | ﹤0.01% |
6,200
+100
| +2% | +$7.06K |
|
3619
Li Auto
LI
$13.8B
| $445K | ﹤0.01% |
16,423
-7,105
| -30% | -$188K |
|
3620
CALL
Perion Network
PERI
$378M
| $445K | ﹤0.01% |
43,900
+24,200
| +123% | +$231K |
|
|
SF
3621
Stifel
SF
$12.8B
| $445K | ﹤0.01% |
6,434
+5,267
| +451% | +$323K |
|
3622
Amphenol
APH
$177B
| $444K | ﹤0.01% |
+4,501
| New | +$368K |
|
3623
PUT
Ceragon Networks
CRNT
$195M
| $444K | ﹤0.01% |
180,700
+117,000
| +184% | +$267K |
|
3624
CALL
IES Holdings
IESC
$10.8B
| $444K | ﹤0.01% |
1,500
-8,200
| -85% | -$1.93M |
|
3625
PUT
Companhia Siderúrgica Nacional
SID
$1.46B
| $444K | ﹤0.01% |
317,800
+23,700
| +8% | +$36.6K |
|
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.