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 | |
|---|---|---|---|---|---|---|
4676
Universal Insurance Holdings
UVE
$1.18B
| $207K | ﹤0.01% |
4,993
+3,419
| +217% | +$129K |
|
4677
CALL
Ocular Therapeutix
OCUL
$1.73B
| $206K | ﹤0.01% |
21,000
-140,300
| -87% | -$1.27M |
|
|
ATAI
4678
PUT
DELISTED
AtaiBeckley Inc
ATAI
| $206K | ﹤0.01% |
39,100
+300
| +0.8% | +$1.26K |
|
|
WDCX
4679
Tradr 2X Long WDC Daily ETF
WDCX
$108M
| $206K | ﹤0.01% |
4,869
+3,777
| +346% | +$108K |
|
|
RAM
4680
Roundhill T-REX 2X Long DRAM Daily Target ETF
RAM
$650M
| $206K | ﹤0.01% |
+7,909
| New | +$203K |
|
|
VZLA
4681
PUT
Vizsla Silver
VZLA
$1.36B
| $205K | ﹤0.01% |
62,200
-1,000
| -2% | -$3.48K |
|
|
BSOL
4682
PUT
Bitwise Solana Staking ETF
BSOL
$967M
| $205K | ﹤0.01% |
20,500
-1,400
| -6% | -$15.2K |
|
4683
CALL
Evercore
EVR
$9.94B
| $205K | ﹤0.01% |
600
-1,400
| -70% | -$479K |
|
|
4684
PUT
Evercore
EVR
$9.94B
| $205K | ﹤0.01% |
600
-11,100
| -95% | -$3.8M |
|
4685
CALL
Principal Financial Group
PFG
$24.4B
| $205K | ﹤0.01% |
1,900
-9,000
| -83% | -$914K |
|
|
4686
PUT
Principal Financial Group
PFG
$24.4B
| $205K | ﹤0.01% |
1,900
-100
| -5% | -$10.2K |
|
4687
PUT
SS&C Technologies
SSNC
$18.2B
| $205K | ﹤0.01% |
+3,300
| New | +$224K |
|
|
AGIX
4688
KraneShares Public-Private AI & Technology ETF
AGIX
$1.16B
| $205K | ﹤0.01% |
4,364
+1,839
| +73% | +$77.9K |
|
4689
PUT
TAL Education Group
TAL
$6.51B
| $204K | ﹤0.01% |
21,300
+600
| +3% | +$6.3K |
|
4690
PUT
Arvinas
ARVN
$490M
| $204K | ﹤0.01% |
24,500
+3,000
| +14% | +$28K |
|
4691
PUT
Bankunited
BKU
$3.03B
| $203K | ﹤0.01% |
4,200
+3,900
| +1,300% | +$183K |
|
|
GRID
4692
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$11.9B
| $203K | ﹤0.01% |
1,058
+506
| +92% | +$95K |
|
4693
PUT
Cognex
CGNX
$10B
| $203K | ﹤0.01% |
2,800
-4,000
| -59% | -$243K |
|
4694
Mercury Systems
MRCY
$5.03B
| $203K | ﹤0.01% |
1,657
+363
| +28% | +$34.6K |
|
4695
Similarweb
SMWB
$679M
| $203K | ﹤0.01% |
33,066
+30,162
| +1,039% | +$110K |
|
|
ALMS
4696
CALL
Alumis Inc
ALMS
$944M
| $203K | ﹤0.01% |
7,200
-7,300
| -50% | -$170K |
|
4697
Ceragon Networks
CRNT
$185M
| $203K | ﹤0.01% |
78,226
+59,364
| +315% | +$155K |
|
|
BTGO
4698
PUT
BitGo Holdings
BTGO
$855M
| $203K | ﹤0.01% |
39,100
+29,500
| +307% | +$242K |
|
4699
CALL
New Fortress Energy
NFE
$34.7M
| $202K | ﹤0.01% |
11,150
+2,666
| +31% | +$79.3K |
|
4700
Prospect Capital
PSEC
$1.13B
| $202K | ﹤0.01% |
+87,612
| New | +$216K |
|
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.