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 |
iShares Russell 2000 ETF
IWM
|
+$146M |
| 2 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$108M |
| 3 |
Apple
AAPL
|
+$62.9M |
| 4 |
Tesla
TSLA
|
+$51.9M |
| 5 |
Micron Technology
MU
|
+$39.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$108M |
| 2 |
Meta Platforms (Facebook)
META
|
+$104M |
| 3 |
Advanced Micro Devices
AMD
|
+$92.1M |
| 4 |
Amazon
AMZN
|
+$90.3M |
| 5 |
TSMC
TSM
|
+$82.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.28% |
| 2 | Technology | 0.76% |
| 3 | Consumer Discretionary | 0.21% |
| 4 | Communication Services | 0.19% |
| 5 | Healthcare | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
676
CALL
3M
MMM
$87.4B
| $11.6M | 0.01% |
71,400
+23,700
| +50% | +$3.59M |
|
677
CALL
United Rentals
URI
$65.2B
| $11.6M | 0.01% |
10,200
-7,300
| -42% | -$6.95M |
|
|
AXON
678
PUT
Axon Enterprise
AXON
$34.9B
| $11.5M | 0.01% |
20,600
+3,000
| +17% | +$1.26M |
|
679
CALL
Zoetis
ZTS
$29.4B
| $11.5M | 0.01% |
160,600
+106,600
| +197% | +$10M |
|
680
PUT
Regeneron Pharmaceuticals
REGN
$81.1B
| $11.5M | 0.01% |
18,500
-3,000
| -14% | -$2.04M |
|
|
681
PUT
Zoetis
ZTS
$29.4B
| $11.5M | 0.01% |
160,500
+146,000
| +1,007% | +$13.7M |
|
682
PUT
Simon Property Group
SPG
$66.3B
| $11.5M | 0.01% |
51,500
+14,800
| +40% | +$3.05M |
|
683
CALL
DigitalOcean
DOCN
$16.4B
| $11.5M | 0.01% |
73,200
-1,100
| -1% | -$149K |
|
684
CALL
Upstart Holdings
UPST
$2.32B
| $11.5M | 0.01% |
324,400
+43,600
| +16% | +$1.34M |
|
685
CALL
Kenvue
KVUE
$34.2B
| $11.5M | 0.01% |
600,600
-138,700
| -19% | -$2.44M |
|
686
CALL
Steel Dynamics
STLD
$33.5B
| $11.5M | 0.01% |
50,000
+10,900
| +28% | +$2.55M |
|
687
CALL
Blue Owl Capital
OWL
$6.37B
| $11.5M | 0.01% |
1,310,800
-220,100
| -14% | -$2.09M |
|
688
PUT
GlobalFoundries
GFS
$27.3B
| $11.4M | 0.01% |
138,800
+69,400
| +100% | +$4.85M |
|
689
PUT
Penumbra
PEN
$12.6B
| $11.4M | 0.01% |
36,100
+4,100
| +13% | +$1.33M |
|
690
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$25.5B
| $11.4M | 0.01% |
16,200
-3,400
| -17% | -$2.28M |
|
691
PUT
Warner Bros
WBD
$77.4B
| $11.4M | 0.01% |
426,500
-122,800
| -22% | -$3.32M |
|
692
PUT
Southwest Airlines
LUV
$20.9B
| $11.4M | 0.01% |
220,800
-79,400
| -26% | -$3.33M |
|
693
CALL
HP
HPQ
$28.2B
| $11.3M | 0.01% |
513,900
+279,200
| +119% | +$6.18M |
|
694
CALL
EQT Corp
EQT
$31.8B
| $11.2M | 0.01% |
211,000
-61,500
| -23% | -$3.45M |
|
|
PENG
695
PUT
Penguin Solutions Inc
PENG
$2.88B
| $11.1M | 0.01% |
146,600
+143,300
| +4,342% | +$6.52M |
|
696
CALL
Tapestry
TPR
$22.7B
| $11.1M | 0.01% |
76,000
-21,000
| -22% | -$3.01M |
|
697
Lumentum
LITE
$84.5B
| $11.1M | 0.01% |
12,958
-39,849
| -75% | -$35.5M |
|
698
CALL
Charter Communications
CHTR
$12.9B
| $11.1M | 0.01% |
77,800
+26,000
| +50% | +$4.34M |
|
699
CALL
Fluence Energy
FLNC
$1.12B
| $11M | 0.01% |
554,400
+400,000
| +259% | +$7.44M |
|
700
PUT
Constellation Brands
STZ
$19.4B
| $11M | 0.01% |
79,100
+14,300
| +22% | +$2.13M |
|
Similar funds
Simplex Trading's Q2 2026 Portfolio in Review
As of Q2 2026, Simplex Trading held 10,638 positions worth $171B, up 14% from $149B the previous quarter. Its ten largest holdings account for 50% of the portfolio.
Simplex Trading's Q2 2026 filing shows 1,714 new, 3,712 increased, 3,486 reduced and 1,487 closed positions. Its largest new stake was Micron Technology: 52,682 shares worth $60.8M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $108M.
By sector, the portfolio is most concentrated in Miscellaneous at 98% of assets, down from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q2 2026 buy was Micron Technology: 52,682 shares worth $60.8M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q2 2026, an estimated $146M increase.
- Simplex Trading's biggest Q2 2026 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $108M.
- Simplex Trading fully exited Intel in Q2 2026, selling an estimated $76.6M.
- Simplex Trading's ten largest holdings make up 50% of its $171B portfolio in Q2 2026.
- Simplex Trading opened 1,714 new positions and closed 1,487 in Q2 2026.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $171B.
Based on Simplex Trading's 13F filing for Q2 2026, filed 12 Aug 2026.