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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 | |
|---|---|---|---|---|---|---|---|
4801
Helus Pharma Inc. Common Stock
HELP
$647M
| $172K | ﹤0.01% |
+13,963
| New | +$146K |
2026 Q3
0 quarters
|
|
4802
Duos Technologies
DUOT
$161M
| $172K | ﹤0.01% |
19,407
-8,764
| -31% | -$79.4K |
2026 Q1
2 quarters
|
|
4803
CALL
Medallion Financial
MFIN
$210M
| $171K | ﹤0.01% |
+14,400
| New | +$159K |
2026 Q3
0 quarters
|
|
4804
Teucrium 2x Long Daily XRP ETF
XXRP
$71.1M
| $171K | ﹤0.01% |
4,905
+716
| +17% | +$19.3K |
2025 Q2
5 quarters
|
|
4805
Tandem Diabetes Care
TNDM
$1.22B
| $170K | ﹤0.01% |
+10,450
| New | +$196K |
2026 Q3
0 quarters
|
|
4806
CALL
Vitesse Energy
VTS
$650M
| $170K | ﹤0.01% |
10,200
+7,200
| +240% | +$119K |
2023 Q2
13 quarters
|
|
4807
PUT
BrightSpring Health Services
BTSG
$14.2B
| $170K | ﹤0.01% |
3,000
-20,400
| -87% | -$1.28M |
2026 Q1
2 quarters
|
|
4808
CALL
ADT
ADT
$7.22B
| $170K | ﹤0.01% |
28,000
-140,700
| -83% | -$999K |
2018 Q2
33 quarters
|
|
4809
CALL
Global Net Lease
GNL
$1.49B
| $170K | ﹤0.01% |
20,600
+400
| +2% | +$3.58K |
2019 Q1
30 quarters
|
|
4810
iShares MSCI Brazil Small-Cap ETF
EWZS
$313M
| $170K | ﹤0.01% |
12,783
+12,088
| +1,739% | +$157K |
2025 Q3
4 quarters
|
|
4811
CALL
Inhibrx
INBX
$1.29B
| $170K | ﹤0.01% |
1,700
-400
| -19% | -$39.9K |
2025 Q3
4 quarters
|
|
4812
NETSCOUT
NTCT
$2.37B
| $170K | ﹤0.01% |
4,233
-4,358
| -51% | -$173K |
2026 Q1
2 quarters
|
|
4813
PUT
Ventas
VTR
$47.4B
| $170K | ﹤0.01% |
2,000
+1,800
| +900% | +$165K |
2016 Q3
40 quarters
|
|
4814
CALL
Clearway Energy Class C
CWEN
$4.04B
| $170K | ﹤0.01% |
5,800
-800
| -12% | -$25.8K |
2018 Q2
33 quarters
|
|
4815
Coursera
COUR
$902M
| $170K | ﹤0.01% |
+34,223
| New | +$192K |
2026 Q3
0 quarters
|
|
4816
PUT
Brighthouse Financial
BHF
$2.54B
| $170K | ﹤0.01% |
3,400
-3,800
| -53% | -$219K |
2019 Q1
30 quarters
|
|
4817
PUT
Albertsons Companies
ACI
$6.2B
| $170K | ﹤0.01% |
14,600
+5,200
| +55% | +$65.8K |
2020 Q3
24 quarters
|
|
|
JMKE
4818
Jersey Mike's Subs
JMKE
$6.31B
| $169K | ﹤0.01% |
+10,077
| New | +$213K |
2026 Q3
0 quarters
|
|
4819
PUT
Harrow
HROW
$1.06B
| $169K | ﹤0.01% |
5,500
-5,000
| -48% | -$195K |
2023 Q2
13 quarters
|
|
4820
CALL
OmniAb
OABI
$722M
| $169K | ﹤0.01% |
34,100
+28,600
| +520% | +$97.7K |
2026 Q2
1 quarter
|
|
4821
PUT
Frequency Electronics
FEIM
$758M
| $169K | ﹤0.01% |
2,000
+1,100
| +122% | +$77K |
2026 Q1
2 quarters
|
|
4822
PUT
Avient
AVNT
$4.12B
| $169K | ﹤0.01% |
4,200
+3,500
| +500% | +$142K |
2026 Q1
2 quarters
|
|
4823
CALL
Taboola.com
TBLA
$567M
| $169K | ﹤0.01% |
50,300
+900
| +2% | +$3.88K |
2026 Q1
2 quarters
|
|
4824
Lennox International
LII
$11.9B
| $169K | ﹤0.01% |
476
+378
| +386% | +$166K |
2025 Q4
3 quarters
|
|
4825
CALL
SailPoint Inc
SAIL
$11.7B
| $169K | ﹤0.01% |
8,300
-6,800
| -45% | -$122K |
2025 Q1
6 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.