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 | |
|---|---|---|---|---|---|---|
2576
Cheesecake Factory
CAKE
$5.2B
| $1.21M | ﹤0.01% |
15,181
+13,754
| +964% | +$891K |
|
|
NAK
2577
CALL
Northern Dynasty Minerals
NAK
$787M
| $1.21M | ﹤0.01% |
628,900
-27,800
| -4% | -$55.8K |
|
2578
CALL
Rezolute
RZLT
$377M
| $1.21M | ﹤0.01% |
232,200
+170,000
| +273% | +$631K |
|
2579
Sigma Lithium
SGML
$1.08B
| $1.21M | ﹤0.01% |
95,358
-17,081
| -15% | -$287K |
|
2580
CALL
Timken Company
TKR
$8.14B
| $1.21M | ﹤0.01% |
8,300
+7,800
| +1,560% | +$938K |
|
2581
PUT
Madison Square Garden
MSGS
$9.7B
| $1.21M | ﹤0.01% |
3,000
+2,900
| +2,900% | +$1.03M |
|
2582
CALL
Star Bulk Carriers
SBLK
$3.43B
| $1.2M | ﹤0.01% |
48,200
+4,500
| +10% | +$116K |
|
2583
CALL
Gaming and Leisure Properties
GLPI
$11.3B
| $1.2M | ﹤0.01% |
27,000
-400
| -1% | -$18.7K |
|
2584
PUT
Paylocity
PCTY
$7.61B
| $1.2M | ﹤0.01% |
11,500
+3,500
| +44% | +$373K |
|
2585
State Street SPDR S&P Telecom ETF
XTL
$545M
| $1.2M | ﹤0.01% |
+5,279
| New | +$1.17M |
|
2586
CALL
Mineralys Therapeutics
MLYS
$2.29B
| $1.2M | ﹤0.01% |
44,500
+34,200
| +332% | +$938K |
|
2587
PUT
Methanex
MEOH
$4.55B
| $1.2M | ﹤0.01% |
26,000
+6,500
| +33% | +$383K |
|
2588
CALL
EverQuote
EVER
$657M
| $1.2M | ﹤0.01% |
50,300
+50,100
| +25,050% | +$918K |
|
2589
PUT
Stanley Black & Decker
SWK
$13.8B
| $1.2M | ﹤0.01% |
12,700
-6,500
| -34% | -$509K |
|
2590
CALL
Darden Restaurants
DRI
$22.7B
| $1.19M | ﹤0.01% |
5,800
-1,600
| -22% | -$321K |
|
|
SVM
2591
Silvercorp Metals
SVM
$2.51B
| $1.19M | ﹤0.01% |
+118,278
| New | +$1.43M |
|
|
MVLL
2592
GraniteShares 2x Long MRVL Daily ETF
MVLL
$432M
| $1.19M | ﹤0.01% |
20,785
+16,504
| +386% | +$544K |
|
2593
Peloton Interactive
PTON
$2.16B
| $1.19M | ﹤0.01% |
201,582
-361,197
| -64% | -$1.95M |
|
2594
PUT
ZTO Express
ZTO
$14.6B
| $1.19M | ﹤0.01% |
53,000
-38,500
| -42% | -$917K |
|
2595
Adtran
ADTN
$581M
| $1.19M | ﹤0.01% |
85,325
-12,260
| -13% | -$191K |
|
2596
PUT
Doximity
DOCS
$4.7B
| $1.18M | ﹤0.01% |
57,100
+49,900
| +693% | +$1.1M |
|
|
UROY
2597
CALL
Uranium Royalty Corp
UROY
$1.58B
| $1.18M | ﹤0.01% |
425,900
+298,400
| +234% | +$1.05M |
|
2598
CALL
Littelfuse
LFUS
$10.9B
| $1.18M | ﹤0.01% |
2,600
+2,200
| +550% | +$953K |
|
2599
CALL
Compass Diversified
CODI
$846M
| $1.18M | ﹤0.01% |
111,000
+10,600
| +11% | +$116K |
|
2600
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $1.18M | ﹤0.01% |
14,300
+13,700
| +2,283% | +$860K |
|
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.