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 | |
|---|---|---|---|---|---|---|---|
8526
OP Bancorp
OPBK
$224M
| $2.58K | ﹤0.01% |
+172
| New | +$2.45K |
2026 Q2
0 quarters
|
|
8527
Elme Communities
ELME
$157M
| $2.58K | ﹤0.01% |
1,740
| – | – |
2025 Q4
2 quarters
|
|
8528
CALL
Barings BDC
BBDC
$873M
| $2.56K | ﹤0.01% |
300
-900
| -75% | -$7.73K |
2024 Q1
9 quarters
|
|
8529
CALL
Actinium Pharmaceuticals
ATNM
$50.3M
| $2.55K | ﹤0.01% |
2,600
-15,800
| -86% | -$18.2K |
2026 Q1
1 quarter
|
|
8530
PUT
Q32 Bio
QTTB
$262M
| $2.55K | ﹤0.01% |
+200
| New | +$1.67K |
2026 Q2
0 quarters
|
|
8531
Daktronics
DAKT
$936M
| $2.54K | ﹤0.01% |
130
-6,714
| -98% | -$133K |
2026 Q1
1 quarter
|
|
8532
Manitowoc
MTW
$799M
| $2.54K | ﹤0.01% |
+183
| New | +$2.32K |
2026 Q2
0 quarters
|
|
8533
VOC Energy
VOC
$60.7M
| $2.53K | ﹤0.01% |
880
-197
| -18% | -$615 |
2025 Q1
5 quarters
|
|
8534
CALL
Viant Technology
DSP
$288M
| $2.53K | ﹤0.01% |
200
-2,100
| -91% | -$23.7K |
2021 Q4
18 quarters
|
|
8535
T-REX 2X Long AFRM Daily Target ETF
AFRU
$1.42M
| $2.53K | ﹤0.01% |
192
-60
| -24% | -$548 |
2026 Q1
1 quarter
|
|
8536
CALL
Quad
QUAD
$501M
| $2.53K | ﹤0.01% |
300
-700
| -70% | -$5.26K |
2016 Q4
38 quarters
|
|
8537
State Street SPDR Portfolio Short Term Corporate Bond ETF
SPSB
$11.3B
| $2.52K | ﹤0.01% |
+84
| New | +$2.52K |
2026 Q2
0 quarters
|
|
8538
KB Financial Group
KB
$40.9B
| $2.52K | ﹤0.01% |
+24
| New | +$2.54K |
2026 Q2
0 quarters
|
|
8539
PUT
GrowGeneration
GRWG
$84.3M
| $2.52K | ﹤0.01% |
+1,700
| New | +$2.41K |
2026 Q2
0 quarters
|
|
8540
Strategy Shares Gold-Hedged Bond ETF
GOLY
$71.5M
| $2.52K | ﹤0.01% |
100
-316
| -76% | -$8.94K |
2026 Q1
1 quarter
|
|
8541
Pennant Group
PNTG
$1.48B
| $2.51K | ﹤0.01% |
68
-5,476
| -99% | -$179K |
2026 Q1
1 quarter
|
|
8542
CALL
Ultrapar
UGP
$8.31B
| $2.51K | ﹤0.01% |
500
-1,300
| -72% | -$7.15K |
2026 Q1
1 quarter
|
|
8543
PUT
OceanaGold Corp
OGC
$5.62B
| $2.51K | ﹤0.01% |
+100
| New | +$2.99K |
2026 Q2
0 quarters
|
|
8544
PUT
Lantern Pharma
LTRN
$9.6M
| $2.5K | ﹤0.01% |
600
+500
| +500% | +$1.47K |
2025 Q4
2 quarters
|
|
8545
PUT
Taboola.com
TBLA
$937M
| $2.5K | ﹤0.01% |
+500
| New | +$2.18K |
2026 Q2
0 quarters
|
|
8546
Watsco Inc
WSO
$13.5B
| $2.5K | ﹤0.01% |
6
-36
| -86% | -$14.5K |
2025 Q3
3 quarters
|
|
8547
Tecogen Inc
TGEN
$62.5M
| $2.5K | ﹤0.01% |
479
-40,853
| -99% | -$205K |
2025 Q3
3 quarters
|
|
8548
Design Therapeutics
DSGN
$656M
| $2.49K | ﹤0.01% |
+172
| New | +$2.14K |
2026 Q2
0 quarters
|
|
8549
PUT
Gogo Inc
GOGO
$286M
| $2.48K | ﹤0.01% |
800
+500
| +167% | +$2.04K |
2021 Q2
20 quarters
|
|
8550
CALL
Adams Natural Resources Fund
PEO
$830M
| $2.47K | ﹤0.01% |
+100
| New | +$2.6K |
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.