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 | |
|---|---|---|---|---|---|---|
3426
TransAlta
TAC
$3.74B
| $578K | ﹤0.01% |
41,771
+28,379
| +212% | +$375K |
|
3427
Nuvectis Pharma
NVCT
$679M
| $577K | ﹤0.01% |
31,394
+28,798
| +1,109% | +$322K |
|
3428
PUT
Becton Dickinson
BDX
$50.1B
| $577K | ﹤0.01% |
5,600
+2,300
| +70% | +$344K |
|
3429
Howard Hughes
HHH
$4.42B
| $576K | ﹤0.01% |
+8,063
| New | +$524K |
|
3430
CALL
Teekay
TK
$1.23B
| $576K | ﹤0.01% |
57,600
+51,100
| +786% | +$639K |
|
3431
Lifestance Health
LFST
$4.5B
| $576K | ﹤0.01% |
53,755
+47,620
| +776% | +$368K |
|
3432
Insteel Industries
IIIN
$567M
| $576K | ﹤0.01% |
19,057
+17,788
| +1,402% | +$510K |
|
3433
PUT
Legend Biotech
LEGN
$3.62B
| $575K | ﹤0.01% |
19,900
+13,200
| +197% | +$356K |
|
3434
C3.ai
AI
$1.67B
| $574K | ﹤0.01% |
63,187
+5,080
| +9% | +$48.2K |
|
3435
CALL
Banco Bilbao Vizcaya Argentaria
BBVA
$159B
| $574K | ﹤0.01% |
22,900
+12,300
| +116% | +$281K |
|
3436
PUT
Darling Ingredients
DAR
$9.56B
| $574K | ﹤0.01% |
10,500
-18,600
| -64% | -$1.11M |
|
3437
PUT
Alamos Gold
AGI
$13.7B
| $573K | ﹤0.01% |
18,900
-5,400
| -22% | -$219K |
|
3438
CALL
Brookfield Infrastructure Partners
BIP
$16B
| $573K | ﹤0.01% |
15,700
+13,300
| +554% | +$497K |
|
|
VNET
3439
VNET Group
VNET
$1.7B
| $572K | ﹤0.01% |
71,185
+34,979
| +97% | +$318K |
|
3440
PUT
Franklin Templeton
BEN
$16.6B
| $572K | ﹤0.01% |
17,200
-26,100
| -60% | -$782K |
|
3441
CALL
NETGEAR
NTGR
$597M
| $572K | ﹤0.01% |
24,500
+20,100
| +457% | +$500K |
|
3442
PUT
Aurinia Pharmaceuticals
AUPH
$2.2B
| $572K | ﹤0.01% |
33,700
+15,500
| +85% | +$248K |
|
3443
CALL
M&T Bank
MTB
$31.8B
| $571K | ﹤0.01% |
2,400
-4,800
| -67% | -$1.05M |
|
3444
PUT
Burford Capital
BUR
$863M
| $571K | ﹤0.01% |
139,300
-98,900
| -42% | -$452K |
|
3445
CALL
Commercial Metals
CMC
$7.13B
| $571K | ﹤0.01% |
9,100
+2,000
| +28% | +$141K |
|
3446
iShares Core S&P Small-Cap ETF
IJR
$104B
| $571K | ﹤0.01% |
3,849
+3,732
| +3,190% | +$512K |
|
|
HSAI
3447
PUT
Hesai Group
HSAI
$2.45B
| $570K | ﹤0.01% |
31,300
-38,400
| -55% | -$786K |
|
3448
Royal Gold
RGLD
$20.4B
| $570K | ﹤0.01% |
2,856
-121
| -4% | -$28.1K |
|
3449
CALL
Vaalco Energy
EGY
$606M
| $570K | ﹤0.01% |
112,200
-37,200
| -25% | -$214K |
|
3450
PUT
HEICO Corp Class A
HEI.A
$32.2B
| $570K | ﹤0.01% |
1,600
-6,800
| -81% | -$1.55M |
|
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.