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 | |
|---|---|---|---|---|---|---|
3376
CALL
Thryv Holdings
THRY
$71.1M
| $596K | ﹤0.01% |
151,300
+151,200
| +151,200% | +$538K |
|
3377
CALL
United Therapeutics
UTHR
$20.8B
| $596K | ﹤0.01% |
1,100
-9,700
| -90% | -$5.46M |
|
3378
PUT
Prothena Corp
PRTA
$448M
| $595K | ﹤0.01% |
60,800
+26,500
| +77% | +$262K |
|
3379
PUT
Dominion Energy
D
$53B
| $594K | ﹤0.01% |
8,700
-35,700
| -80% | -$2.32M |
|
3380
CALL
La-Z-Boy
LZB
$1.19B
| $594K | ﹤0.01% |
+14,800
| New | +$535K |
|
3381
CALL
Tenable Holdings
TENB
$3.8B
| $594K | ﹤0.01% |
16,100
+16,000
| +16,000% | +$376K |
|
|
COLO
3382
Global X MSCI Colombia ETF
COLO
$214M
| $594K | ﹤0.01% |
+14,255
| New | +$571K |
|
3383
CALL
Kinsale Capital Group
KNSL
$7.4B
| $594K | ﹤0.01% |
1,800
+1,100
| +157% | +$354K |
|
3384
CALL
Lifetime Brands
LCUT
$212M
| $593K | ﹤0.01% |
69,500
+68,500
| +6,850% | +$530K |
|
3385
PUT
Larimar Therapeutics
LRMR
$329M
| $593K | ﹤0.01% |
194,300
+148,100
| +321% | +$588K |
|
3386
CALL
Service Corp International
SCI
$10.5B
| $592K | ﹤0.01% |
7,800
-30,600
| -80% | -$2.39M |
|
|
AIRL
3387
CALL
DELISTED
Themes Airlines ETF
AIRL
| $592K | ﹤0.01% |
34,400
+20,900
| +155% | +$359K |
|
3388
Lincoln National
LNC
$7.83B
| $592K | ﹤0.01% |
16,736
-22,453
| -57% | -$807K |
|
3389
Neurocrine Biosciences
NBIX
$14.3B
| $591K | ﹤0.01% |
3,509
-3,635
| -51% | -$539K |
|
3390
Regenxbio
RGNX
$493M
| $590K | ﹤0.01% |
+49,244
| New | +$409K |
|
3391
CALL
BlackLine
BL
$1.54B
| $589K | ﹤0.01% |
21,000
+17,400
| +483% | +$520K |
|
3392
PUT
Trane Technologies
TT
$99.5B
| $589K | ﹤0.01% |
1,200
-8,500
| -88% | -$3.98M |
|
|
BRUN
3393
Boost Run Inc
BRUN
$1.29B
| $589K | ﹤0.01% |
+15,183
| New | +$471K |
|
3394
CALL
Loews
L
$21.5B
| $589K | ﹤0.01% |
5,200
+5,100
| +5,100% | +$553K |
|
3395
CALL
W&T Offshore
WTI
$540M
| $588K | ﹤0.01% |
186,800
-91,700
| -33% | -$340K |
|
3396
Cabot Corp
CBT
$4.05B
| $588K | ﹤0.01% |
+6,472
| New | +$529K |
|
3397
Lumen
LUMN
$5.7B
| $587K | ﹤0.01% |
+76,474
| New | +$671K |
|
3398
PUT
Recursion Pharmaceuticals
RXRX
$1.98B
| $587K | ﹤0.01% |
160,000
+16,700
| +12% | +$55.6K |
|
3399
CALL
Schrodinger
SDGR
$2.21B
| $587K | ﹤0.01% |
36,100
-3,800
| -10% | -$50.8K |
|
3400
PUT
IPG Photonics
IPGP
$3.28B
| $587K | ﹤0.01% |
+5,000
| New | +$574K |
|
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.