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 | Held Since | |
|---|---|---|---|---|---|---|---|
8601
PUT
Aura Biosciences
AURA
$670M
| $2.13K | ﹤0.01% |
300
-29,700
| -99% | -$212K |
2026 Q1
1 quarter
|
|
8602
CALL
NeuroOne Medical Technologies
NMTC
$8.92M
| $2.13K | ﹤0.01% |
700
-217
| -24% | -$886 |
2026 Q1
1 quarter
|
|
8603
CALL
AXS Astoria Inflation Sensitive ETF
PPI
$153M
| $2.13K | ﹤0.01% |
+100
| New | +$2.16K |
2026 Q2
0 quarters
|
|
8604
Seven Hills Realty Trust
SEVN
$140M
| $2.12K | ﹤0.01% |
252
-416
| -62% | -$3.47K |
2024 Q3
7 quarters
|
|
8605
CALL
Columbia Financial
CLBK
$2.93B
| $2.12K | ﹤0.01% |
220
-4,180
| -95% | -$36.9K |
2026 Q1
1 quarter
|
|
8606
AngioDynamics
ANGO
$505M
| $2.12K | ﹤0.01% |
+163
| New | +$1.86K |
2026 Q2
0 quarters
|
|
8607
Amerant Bancorp
AMTB
$1.16B
| $2.12K | ﹤0.01% |
+83
| New | +$1.93K |
2026 Q2
0 quarters
|
|
8608
CALL
Telus
TU
$14B
| $2.11K | ﹤0.01% |
200
-176,100
| -100% | -$2.15M |
2020 Q1
25 quarters
|
|
8609
PUT
DiaMedica Therapeutics
DMAC
$465M
| $2.11K | ﹤0.01% |
300
-1,900
| -86% | -$11.7K |
2025 Q3
3 quarters
|
|
8610
Codexis
CDXS
$143M
| $2.11K | ﹤0.01% |
932
-389
| -29% | -$968 |
2025 Q4
2 quarters
|
|
8611
CALL
KORU Medical Systems
KRMD
$142M
| $2.1K | ﹤0.01% |
500
-7,700
| -94% | -$31.5K |
2025 Q3
3 quarters
|
|
8612
PUT
Lightspeed Commerce
LSPD
$1.45B
| $2.1K | ﹤0.01% |
+200
| New | +$1.86K |
2026 Q2
0 quarters
|
|
8613
PUT
Kingsway Corp
KWY
$286M
| $2.08K | ﹤0.01% |
200
-13,000
| -98% | -$140K |
2025 Q2
4 quarters
|
|
8614
CALL
Shattuck Labs
STTK
$562M
| $2.08K | ﹤0.01% |
300
-2,200
| -88% | -$13.7K |
2025 Q3
3 quarters
|
|
8615
Tradr 2X Short CBRS Daily ETF
CBRZ
$11.3M
| $2.08K | ﹤0.01% |
+122
| New | +$3.05K |
2026 Q2
0 quarters
|
|
8616
PUT
Relmada Therapeutics
RLMD
$351M
| $2.08K | ﹤0.01% |
300
-25,900
| -99% | -$181K |
2026 Q1
1 quarter
|
|
8617
CALL
Enovis
ENOV
$1.25B
| $2.07K | ﹤0.01% |
100
-1,000
| -91% | -$23.6K |
2023 Q2
12 quarters
|
|
8618
BJ's Restaurants
BJRI
$1.25B
| $2.06K | ﹤0.01% |
34
-522
| -94% | -$22.8K |
2026 Q1
1 quarter
|
|
8619
G-III Apparel Group
GIII
$1.28B
| $2.06K | ﹤0.01% |
61
-2,407
| -98% | -$76K |
2026 Q1
1 quarter
|
|
8620
ProShares S&P 500 ex-Technology ETF
SPXT
$304M
| $2.06K | ﹤0.01% |
+19
| New | +$2.03K |
2026 Q2
0 quarters
|
|
8621
PUT
MillerKnoll
MLKN
$1.49B
| $2.05K | ﹤0.01% |
+100
| New | +$1.6K |
2026 Q2
0 quarters
|
|
8622
BeyondSpring
BYSI
$18.3M
| $2.04K | ﹤0.01% |
1,165
+301
| +35% | +$487 |
2026 Q1
1 quarter
|
|
8623
Nautilus Biotechnolgy
NAUT
$331M
| $2.04K | ﹤0.01% |
+1,090
| New | +$2.88K |
2026 Q2
0 quarters
|
|
8624
CALL
Hyperfine
HYPR
$77M
| $2.02K | ﹤0.01% |
1,500
-3,600
| -71% | -$5.2K |
2025 Q3
3 quarters
|
|
8625
State Street SPDR S&P 600 Small Cap Growth ETF
SLYG
$4.77B
| $2.02K | ﹤0.01% |
+17
| New | +$1.84K |
2026 Q2
0 quarters
|
|
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.