We are live on !
Find out more
Simplex Trading Portfolio holdings
AUM
$171B
Turnover
30.09%
1-Year Est. Return
85%
Simplex Trading is a market maker that trades for its own account, mainly in US stock options and options on futures, using software it builds itself. Its work pairs software developers with data-driven traders. It was founded in Chicago in 2004, and Erik Swanson, who joined straight out of college as a trader, has been its chief executive since 2014. It also invests in early-stage financial and technology start-ups.
This Fund
S&P 500
This Quarter Est. Return
+39.06%
1 Year Est. Return
+85%
3 Year Est. Return
+183.25%
5 Year Est. Return
+145.21%
10 Year Est. Return
+1,056.84%
AUM
$171B
AUM Growth
+$21.5B
(+14%)
Cap. Flow
-$29.5M
Cap. Flow % of AUM
Cap. Flow %
-0.02%
Top 10 Holdings %
Top 10 Hldgs %
49.56%
Holding
10,638
New
1,714
Increased
3,712
Reduced
3,486
Closed
1,487
Avg Time Held
Equity + Options
2.9
years
Top 10 Avg Time Held
Equity + Options
3.8
years
Top 20 Avg Time Held
Equity + Options
4.1
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.3
years
Top 20 Avg Time Held Equity only
0.3
years
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 | |
|---|---|---|---|---|---|---|---|
5501
PUT
Ballard Power Systems
BLDP
$562M
| $103K | ﹤0.01% |
26,600
+16,900
| +174% | +$68.9K |
2025 Q3
3 quarters
|
|
5502
Pony AI Inc
PONY
$2.14B
| $103K | ﹤0.01% |
14,858
-7,191
| -33% | -$66.7K |
2025 Q4
2 quarters
|
|
5503
CALL
First Busey Corp
BUSE
$2.43B
| $103K | ﹤0.01% |
3,500
+3,400
| +3,400% | +$92.2K |
2025 Q2
4 quarters
|
|
5504
PUT
Equity Lifestyle Properties
ELS
$11.5B
| $103K | ﹤0.01% |
1,600
+800
| +100% | +$50.6K |
2025 Q2
4 quarters
|
|
5505
PUT
Consensus Cloud Solutions
CCSI
$691M
| $103K | ﹤0.01% |
2,700
-1,900
| -41% | -$56.9K |
2026 Q1
1 quarter
|
|
5506
PUT
Candel Therapeutics
CADL
$662M
| $103K | ﹤0.01% |
10,000
-19,500
| -66% | -$147K |
2024 Q2
8 quarters
|
|
5507
CALL
Establishment Labs
ESTA
$2.04B
| $103K | ﹤0.01% |
1,200
-5,900
| -83% | -$424K |
2026 Q1
1 quarter
|
|
|
5508
PUT
Establishment Labs
ESTA
$2.04B
| $103K | ﹤0.01% |
1,200
-1,300
| -52% | -$93.4K |
2026 Q1
1 quarter
|
|
5509
Paylocity
PCTY
$8.79B
| $103K | ﹤0.01% |
984
-907
| -48% | -$96.6K |
2025 Q4
2 quarters
|
|
5510
PUT
EHang Holdings
EH
$278M
| $103K | ﹤0.01% |
15,700
-5,000
| -24% | -$46.7K |
2021 Q1
21 quarters
|
|
5511
CALL
Willdan Group
WLDN
$1.18B
| $103K | ﹤0.01% |
1,300
+1,100
| +550% | +$93.7K |
2025 Q3
3 quarters
|
|
5512
LifeVantage
LFVN
$73.9M
| $103K | ﹤0.01% |
16,453
+14,112
| +603% | +$85.4K |
2025 Q4
2 quarters
|
|
5513
Leverage Shares 2X Long CRWV Daily ETF
CRWG
$50.4M
| $103K | ﹤0.01% |
3,216
+2,016
| +168% | +$84.8K |
2026 Q1
1 quarter
|
|
5514
PUT
Matthews International
MATW
$604M
| $102K | ﹤0.01% |
3,800
-2,500
| -40% | -$67.2K |
2025 Q3
3 quarters
|
|
5515
PUT
Aspen Aerogels
ASPN
$447M
| $102K | ﹤0.01% |
16,100
+5,800
| +56% | +$28.4K |
2020 Q4
22 quarters
|
|
5516
Ascent Industries
ACNT
$124M
| $102K | ﹤0.01% |
6,789
-1,728
| -20% | -$24.1K |
2025 Q4
2 quarters
|
|
5517
CALL
KLX Energy Services
KLXE
$122M
| $102K | ﹤0.01% |
+39,500
| New | +$117K |
2026 Q2
0 quarters
|
|
5518
CALL
Lifezone Metals
LZM
$326M
| $102K | ﹤0.01% |
+26,200
| New | +$122K |
2026 Q2
0 quarters
|
|
5519
PUT
Vanda Pharmaceuticals
VNDA
$245M
| $102K | ﹤0.01% |
16,600
-6,200
| -27% | -$40.5K |
2023 Q4
10 quarters
|
|
5520
Hercules Capital
HTGC
$3.16B
| $101K | ﹤0.01% |
+6,429
| New | +$100K |
2026 Q2
0 quarters
|
|
5521
CALL
Yext
YEXT
$724M
| $101K | ﹤0.01% |
21,700
-179,300
| -89% | -$696K |
2017 Q3
35 quarters
|
|
5522
CALL
Ready Capital
RC
$190M
| $101K | ﹤0.01% |
57,900
-162,600
| -74% | -$286K |
2020 Q1
25 quarters
|
|
5523
CALL
Navient
NAVI
$852M
| $101K | ﹤0.01% |
11,900
+9,100
| +325% | +$76.4K |
2015 Q4
42 quarters
|
|
5524
CALL
DXP Enterprises
DXPE
$2.74B
| $101K | ﹤0.01% |
600
+400
| +200% | +$63.1K |
2025 Q1
5 quarters
|
|
5525
CAE Inc
CAE
$8.45B
| $101K | ﹤0.01% |
4,038
+3,700
| +1,095% | +$95.8K |
2025 Q2
4 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.