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 | |
|---|---|---|---|---|---|---|
2051
CALL
GXO Logistics
GXO
$5.18B
| $1.98M | ﹤0.01% |
39,100
+13,300
| +52% | +$689K |
|
2052
CALL
Trimble
TRMB
$13.5B
| $1.98M | ﹤0.01% |
38,700
+34,800
| +892% | +$2.06M |
|
2053
Regeneron Pharmaceuticals
REGN
$81.1B
| $1.98M | ﹤0.01% |
+3,172
| New | +$2.16M |
|
2054
PUT
CRISPR Therapeutics
CRSP
$5.24B
| $1.97M | ﹤0.01% |
36,200
-40,100
| -53% | -$2.11M |
|
2055
QuantumScape Corp
QS
$3.02B
| $1.97M | ﹤0.01% |
260,905
+201,677
| +341% | +$1.51M |
|
2056
PUT
Amdocs
DOX
$6.03B
| $1.97M | ﹤0.01% |
39,000
-9,300
| -19% | -$570K |
|
2057
PUT
nLIGHT
LASR
$2.33B
| $1.97M | ﹤0.01% |
28,300
+19,300
| +214% | +$1.35M |
|
2058
PUT
First Horizon
FHN
$11.1B
| $1.97M | ﹤0.01% |
76,800
-30,200
| -28% | -$736K |
|
2059
Organon & Co
OGN
$3.61B
| $1.97M | ﹤0.01% |
+145,377
| New | +$1.74M |
|
2060
Immunovant
IMVT
$6.88B
| $1.97M | ﹤0.01% |
51,080
+804
| +2% | +$24.5K |
|
|
CRCG
2061
PUT
Leverage Shares 2X Long CRCL Daily ETF
CRCG
$144M
| $1.97M | ﹤0.01% |
111,200
+95,430
| +605% | +$2.44M |
|
2062
CALL
Rush Street Interactive
RSI
$2.3B
| $1.96M | ﹤0.01% |
65,800
-167,100
| -72% | -$4.4M |
|
2063
IQVIA
IQV
$44.5B
| $1.96M | ﹤0.01% |
+10,126
| New | +$1.77M |
|
2064
CALL
Nextpower Inc. Common Stock
NXT
$12.3B
| $1.95M | ﹤0.01% |
16,400
-18,200
| -53% | -$2.25M |
|
2065
VanEck Rare Earth/Strategic Metals ETF
REMX
$1.91B
| $1.95M | ﹤0.01% |
22,021
+7,634
| +53% | +$742K |
|
2066
PUT
argenx
ARGX
$60B
| $1.95M | ﹤0.01% |
2,100
-2,400
| -53% | -$1.98M |
|
2067
CALL
Simon Property Group
SPG
$66.3B
| $1.95M | ﹤0.01% |
8,700
-25,200
| -74% | -$5.19M |
|
2068
CALL
Wingstop
WING
$2.7B
| $1.94M | ﹤0.01% |
11,200
+4,000
| +56% | +$630K |
|
2069
Biogen
BIIB
$33.6B
| $1.94M | ﹤0.01% |
8,983
+6,819
| +315% | +$1.3M |
|
2070
CALL
Klaviyo
KVYO
$4.5B
| $1.94M | ﹤0.01% |
128,400
+94,700
| +281% | +$1.57M |
|
|
DENT
2071
PUT
DELISTED
AdvisorShares Dent Tactical ETF
DENT
| $1.94M | ﹤0.01% |
383,100
+74,200
| +24% | +$375K |
|
2072
CALL
Western Midstream Partners
WES
$18.8B
| $1.94M | ﹤0.01% |
44,300
+27,100
| +158% | +$1.17M |
|
2073
PUT
Franco-Nevada
FNV
$49.7B
| $1.94M | ﹤0.01% |
9,300
+100
| +1% | +$23.3K |
|
2074
CALL
Saia
SAIA
$8.63B
| $1.94M | ﹤0.01% |
4,600
+1,100
| +31% | +$483K |
|
|
ATAI
2075
CALL
DELISTED
AtaiBeckley Inc
ATAI
| $1.94M | ﹤0.01% |
367,200
-59,500
| -14% | -$250K |
|
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.