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Simplex Trading Portfolio holdings
AUM
$184B
Turnover
28.44%
1-Year Est. Return
51.71%
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
-0.22%
1 Year Est. Return
+51.71%
3 Year Est. Return
+194.66%
5 Year Est. Return
+164.83%
10 Year Est. Return
+968.67%
AUM
$184B
AUM Growth
+$13.3B
(+7.8%)
Cap. Flow
-$519M
Cap. Flow % of AUM
Cap. Flow %
-0.28%
Top 10 Holdings %
Top 10 Hldgs %
50.68%
Holding
10,644
New
1,493
Increased
3,697
Reduced
3,633
Closed
1,534
Avg Time Held
Equity + Options
3
years
Top 10 Avg Time Held
Equity + Options
3.9
years
Top 20 Avg Time Held
Equity + Options
4.3
years
Avg Time Held Equity only
0.5
years
Top 10 Avg Time Held Equity only
0.5
years
Top 20 Avg Time Held Equity only
0.4
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$92.6M |
| 2 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$80.6M |
| 3 |
Amazon
AMZN
|
+$26.3M |
| 4 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$25.7M |
| 5 |
SPDR Gold Trust
GLD
|
+$20.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class A
GOOGL
|
+$128M |
| 2 |
NVIDIA
NVDA
|
+$97.8M |
| 3 |
Tesla
TSLA
|
+$53.9M |
| 4 |
Micron Technology
MU
|
+$50M |
| 5 |
United States Oil Fund
USO
|
+$49.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Miscellaneous | 98.84% |
| 2 | Technology | 0.45% |
| 3 | Consumer Discretionary | 0.14% |
| 4 | Healthcare | 0.14% |
| 5 | Financials | 0.1% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
5126
PUT
Aardvark Therapeutics
AARD
$33.3M
| $130K | ﹤0.01% |
24,600
-9,500
| -28% | -$58K |
2026 Q1
2 quarters
|
|
5127
MBIA
MBI
$239M
| $130K | ﹤0.01% |
30,429
+4,188
| +16% | +$22K |
2021 Q1
22 quarters
|
|
5128
PUT
DELISTED
DigitalBridge
DBRG
| $130K | ﹤0.01% |
8,100
-9,400
| -54% | -$149K |
2021 Q2
21 quarters
|
|
5129
PUT
Mitek Systems
MITK
$823M
| $130K | ﹤0.01% |
7,600
+6,800
| +850% | +$123K |
2021 Q2
21 quarters
|
|
5130
PUT
Covenant Logistics
CVLG
$834M
| $129K | ﹤0.01% |
4,000
+3,400
| +567% | +$130K |
2026 Q1
2 quarters
|
|
5131
Albemarle
ALB
$11.2B
| $129K | ﹤0.01% |
+1,222
| New | +$152K |
2026 Q3
0 quarters
|
|
5132
CALL
Amtech Systems
ASYS
$218M
| $129K | ﹤0.01% |
7,700
+3,400
| +79% | +$54.1K |
2025 Q2
5 quarters
|
|
5133
Seanergy Maritime Holdings
SHIP
$338M
| $129K | ﹤0.01% |
7,861
+4,678
| +147% | +$78.2K |
2026 Q1
2 quarters
|
|
5134
T-REX 2X Long SNOW Daily Target ETF
SNOU
$18.2M
| $129K | ﹤0.01% |
+1,912
| New | +$112K |
2026 Q3
0 quarters
|
|
5135
PagSeguro Digital
PAGS
$2.16B
| $129K | ﹤0.01% |
+14,474
| New | +$134K |
2026 Q3
0 quarters
|
|
5136
Virtus Reaves Utilities ETF
UTES
$1.17B
| $129K | ﹤0.01% |
1,835
-1,543
| -46% | -$118K |
2025 Q4
3 quarters
|
|
5137
Flowserve
FLS
$10.6B
| $129K | ﹤0.01% |
1,760
-1,951
| -53% | -$146K |
2026 Q1
2 quarters
|
|
5138
PUT
FT Vest Gold Strategy Target Income ETF
IGLD
$551M
| $129K | ﹤0.01% |
1,700
+700
| +70% | +$14.9K |
2022 Q2
17 quarters
|
|
|
IOND
5139
CALL
Ionic Digital Inc
IOND
$2.91B
| $129K | ﹤0.01% |
+1,600
| New | +$117K |
2026 Q3
0 quarters
|
|
5140
PUT
Astronics
ATRO
$2.59B
| $128K | ﹤0.01% |
2,500
+1,900
| +317% | +$139K |
2025 Q3
4 quarters
|
|
5141
CALL
TD Synnex
SNX
$19.3B
| $128K | ﹤0.01% |
500
-5,400
| -92% | -$1.38M |
2017 Q1
38 quarters
|
|
5142
PUT
Intrepid Potash
IPI
$446M
| $128K | ﹤0.01% |
4,000
+2,600
| +186% | +$94.5K |
2026 Q1
2 quarters
|
|
5143
PUT
Prothena Corp
PRTA
$423M
| $128K | ﹤0.01% |
15,300
-45,500
| -75% | -$406K |
2022 Q2
17 quarters
|
|
5144
Coca-Cola Femsa
KOF
$24.9B
| $128K | ﹤0.01% |
1,182
+119
| +11% | +$13K |
2026 Q2
1 quarter
|
|
5145
Affiliated Managers Group
AMG
$9.7B
| $128K | ﹤0.01% |
349
-606
| -63% | -$220K |
2026 Q1
2 quarters
|
|
5146
PUT
Saic
SAIC
$6.34B
| $128K | ﹤0.01% |
1,000
+900
| +900% | +$111K |
2026 Q1
2 quarters
|
|
5147
PUT
QuidelOrtho
QDEL
$729M
| $128K | ﹤0.01% |
12,100
-32,900
| -73% | -$483K |
2018 Q2
33 quarters
|
|
5148
John Wiley & Sons Class A
WLY
$2.51B
| $127K | ﹤0.01% |
2,667
-399
| -13% | -$20.2K |
2026 Q1
2 quarters
|
|
5149
CALL
Alector
ALEC
$365M
| $127K | ﹤0.01% |
68,800
+47,300
| +220% | +$91.3K |
2024 Q4
7 quarters
|
|
5150
PUT
Slide Insurance Holdings
SLDE
$3.04B
| $127K | ﹤0.01% |
5,700
+100
| +2% | +$2.23K |
2025 Q3
4 quarters
|
|
Similar funds
Simplex Trading's Q3 2026 Portfolio in Review
As of Q3 2026, Simplex Trading held 10,644 positions worth $184B, up 7.8% from $171B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading's Q3 2026 filing shows 1,493 new, 3,697 increased, 3,633 reduced and 1,534 closed positions. Its largest new stake was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M. The largest sale was Alphabet (Google) Class A, an estimated $128M.
By sector, the portfolio is most concentrated in Miscellaneous at 99% of assets, up from 98% a quarter earlier, followed by Technology and Consumer Discretionary.
- Simplex Trading's largest Q3 2026 buy was iShares iBoxx $ High Yield Corporate Bond ETF: 1,017,542 shares worth $78.6M.
- Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q3 2026, an estimated $92.6M increase.
- Simplex Trading's biggest Q3 2026 reduction was NVIDIA, cutting an estimated $97.8M.
- Simplex Trading fully exited Alphabet (Google) Class A in Q3 2026, selling an estimated $128M.
- Simplex Trading's ten largest holdings make up 51% of its $184B portfolio in Q3 2026.
- Simplex Trading opened 1,493 new positions and closed 1,534 in Q3 2026.
- Simplex Trading's portfolio value rose 7.8% quarter-over-quarter to $184B.
Based on Simplex Trading's 13F filing for Q3 2026, filed 4 Nov 2026.