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 | |
|---|---|---|---|---|---|---|
1701
PUT
BigBear.ai
BBAI
$1.34B
| $2.76M | ﹤0.01% |
752,800
-310,200
| -29% | -$1.24M |
|
1702
CALL
Avantor
AVTR
$10.3B
| $2.76M | ﹤0.01% |
278,800
+232,000
| +496% | +$2M |
|
|
CRCO
1703
CALL
YieldMax CRCL Option Income Strategy ETF
CRCO
$33.6M
| $2.76M | ﹤0.01% |
331,100
+18,800
| +6% | +$395K |
|
1704
Align Technology
ALGN
$10.4B
| $2.76M | ﹤0.01% |
16,354
-440
| -3% | -$76.4K |
|
1705
CALL
Corebridge Financial
CRBG
$15.5B
| $2.75M | ﹤0.01% |
96,100
+73,500
| +325% | +$1.99M |
|
1706
CALL
Tenet Healthcare
THC
$20.9B
| $2.75M | ﹤0.01% |
14,700
+13,300
| +950% | +$2.45M |
|
1707
PUT
Sarepta Therapeutics
SRPT
$1.97B
| $2.75M | ﹤0.01% |
153,000
-186,700
| -55% | -$3.53M |
|
1708
CALL
Arch Capital
ACGL
$32.3B
| $2.75M | ﹤0.01% |
28,300
+24,100
| +574% | +$2.27M |
|
1709
CALL
Symbotic
SYM
$5.65B
| $2.75M | ﹤0.01% |
61,100
+34,500
| +130% | +$1.76M |
|
1710
ResMed
RMD
$32B
| $2.75M | ﹤0.01% |
+14,089
| New | +$2.92M |
|
1711
PUT
monday.com
MNDY
$3.54B
| $2.74M | ﹤0.01% |
37,900
+26,100
| +221% | +$1.91M |
|
1712
CALL
Ally Financial
ALLY
$11.8B
| $2.74M | ﹤0.01% |
59,700
+8,600
| +17% | +$373K |
|
1713
CALL
Raymond James Financial
RJF
$30.8B
| $2.74M | ﹤0.01% |
18,000
+6,000
| +50% | +$911K |
|
1714
Ouster
OUST
$3.15B
| $2.74M | ﹤0.01% |
43,750
+23,916
| +121% | +$804K |
|
1715
PUT
Hormel Foods
HRL
$10.8B
| $2.74M | ﹤0.01% |
110,200
+1,000
| +0.9% | +$22.2K |
|
1716
CALL
Toll Brothers
TOL
$12.7B
| $2.73M | ﹤0.01% |
16,600
+4,100
| +33% | +$583K |
|
|
ETHE
1717
CALL
Grayscale Ethereum Staking ETF Shares
ETHE
$2.05B
| $2.73M | ﹤0.01% |
214,300
-21,700
| -9% | -$362K |
|
1718
CALL
Markel Group
MKL
$21.4B
| $2.73M | ﹤0.01% |
+1,400
| New | +$2.61M |
|
1719
CALL
C3.ai
AI
$1.71B
| $2.73M | ﹤0.01% |
300,700
-13,700
| -4% | -$130K |
|
1720
PUT
T. Rowe Price
TROW
$22.5B
| $2.73M | ﹤0.01% |
24,000
+9,500
| +66% | +$972K |
|
1721
Madison Square Garden
MSGS
$9.7B
| $2.73M | ﹤0.01% |
6,783
+3,717
| +121% | +$1.32M |
|
|
KOCG
1722
PUT
DELISTED
FIS Knights of Columbus Global Belief ETF
KOCG
| $2.72M | ﹤0.01% |
65,700
+14,600
| +29% | +$605K |
|
1723
United States Copper Index Fund
CPER
$759M
| $2.72M | ﹤0.01% |
72,198
-17,848
| -20% | -$673K |
|
1724
CALL
BridgeBio Pharma
BBIO
$12.8B
| $2.72M | ﹤0.01% |
36,500
+400
| +1% | +$28K |
|
1725
CALL
Baker Hughes
BKR
$57.4B
| $2.71M | ﹤0.01% |
48,900
-32,900
| -40% | -$2.08M |
|
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.