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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 | |
|---|---|---|---|---|---|---|---|
5651
GBank Financial Holdings
GBFH
$194M
| $92.1K | ﹤0.01% |
3,037
+2,522
| +490% | +$73.6K |
2026 Q1
1 quarter
|
|
5652
Direxion Auspice Broad Commodity Strategy ETF
COM
$200M
| $92K | ﹤0.01% |
2,822
-12
| -0.4% | -$405 |
2026 Q1
1 quarter
|
|
5653
CALL
Shoe Station Group
SHOE
$409M
| $91.9K | ﹤0.01% |
6,200
+5,500
| +786% | +$93.9K |
2025 Q4
2 quarters
|
|
5654
CALL
BGC Group
BGC
$5.42B
| $91.9K | ﹤0.01% |
8,600
-54,700
| -86% | -$612K |
2020 Q1
25 quarters
|
|
5655
PUT
AEVEX Corp
AVEX
$891M
| $91.9K | ﹤0.01% |
+4,400
| New | +$114K |
2026 Q2
0 quarters
|
|
5656
PUT
CMS Energy
CMS
$21.6B
| $91.8K | ﹤0.01% |
+1,200
| New | +$89.9K |
2026 Q2
0 quarters
|
|
5657
Wave Life Sciences
WVE
$751M
| $91.8K | ﹤0.01% |
15,792
-73,471
| -82% | -$487K |
2024 Q1
9 quarters
|
|
5658
PUT
Kymera Therapeutics
KYMR
$10.4B
| $91.7K | ﹤0.01% |
800
+600
| +300% | +$51.6K |
2025 Q4
2 quarters
|
|
5659
iPath Series B S&P 500 VIX Mid-Term Futures ETN
VXZ
$28.3M
| $91.7K | ﹤0.01% |
1,818
-794
| -30% | -$43.6K |
2025 Q2
4 quarters
|
|
5660
CALL
PayPay
PAYP
$9.8B
| $91.7K | ﹤0.01% |
+6,400
| New | +$118K |
2026 Q2
0 quarters
|
|
5661
Aardvark Therapeutics
AARD
$30M
| $91.7K | ﹤0.01% |
15,917
+11,674
| +275% | +$54.5K |
2026 Q1
1 quarter
|
|
5662
St. Joe Company
JOE
$4.07B
| $91.6K | ﹤0.01% |
+1,462
| New | +$95.9K |
2026 Q2
0 quarters
|
|
5663
CALL
Senseonics Holdings Inc
SENS
$503M
| $91.4K | ﹤0.01% |
16,100
+7,300
| +83% | +$46.8K |
2019 Q1
29 quarters
|
|
5664
Defiance AI & Power Infrastructure ETF
AIPO
$801M
| $91.2K | ﹤0.01% |
+2,730
| New | +$84.8K |
2026 Q2
0 quarters
|
|
5665
CALL
WW International
WW
$147M
| $91.1K | ﹤0.01% |
5,700
+4,300
| +307% | +$57.4K |
2025 Q3
3 quarters
|
|
5666
Taysha Gene Therapies
TSHA
$1.41B
| $91.1K | ﹤0.01% |
+13,371
| New | +$79.1K |
2026 Q2
0 quarters
|
|
5667
Madison Air Solutions
MAIR
$12B
| $91K | ﹤0.01% |
+2,334
| New | +$91K |
2026 Q2
0 quarters
|
|
5668
PUT
Microbot Medical
MBOT
$72.5M
| $90.9K | ﹤0.01% |
46,600
-58,900
| -56% | -$120K |
2025 Q2
4 quarters
|
|
5669
CALL
Mistras Group
MG
$644M
| $90.8K | ﹤0.01% |
5,200
+3,000
| +136% | +$53.4K |
2025 Q1
5 quarters
|
|
5670
Upwork
UPWK
$1.15B
| $90.7K | ﹤0.01% |
+10,852
| New | +$103K |
2026 Q2
0 quarters
|
|
5671
CALL
Macerich
MAC
$6.85B
| $90.7K | ﹤0.01% |
+3,600
| New | +$80.9K |
2026 Q2
0 quarters
|
|
5672
PUT
Immunic
IMUX
$110M
| $90.7K | ﹤0.01% |
5,900
+5,310
| +900% | +$65.5K |
2026 Q1
1 quarter
|
|
5673
PUT
PagSeguro Digital
PAGS
$2.24B
| $90.5K | ﹤0.01% |
10,000
+3,100
| +45% | +$30K |
2018 Q2
32 quarters
|
|
5674
ProShares Short 20+ Year Treasury ETF
TBF
$120M
| $90.4K | ﹤0.01% |
+3,730
| New | +$91.2K |
2026 Q2
0 quarters
|
|
5675
CALL
NewtekOne
NEWT
$328M
| $90.3K | ﹤0.01% |
6,100
+2,900
| +91% | +$38.3K |
2018 Q2
32 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.