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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 | |
|---|---|---|---|---|---|---|---|
4776
CALL
Graphic Packaging
GPK
$3.19B
| $175K | ﹤0.01% |
19,300
+5,600
| +41% | +$59.9K |
2020 Q3
24 quarters
|
|
4777
CALL
BitGo Holdings
BTGO
$493M
| $175K | ﹤0.01% |
23,600
+13,100
| +125% | +$80.3K |
2026 Q1
2 quarters
|
|
4778
PUT
Teucrium 2x Long Daily XRP ETF
XXRP
$71.1M
| $174K | ﹤0.01% |
5,000
+500
| +11% | +$13.5K |
2026 Q2
1 quarter
|
|
4779
HEICO Corp
HEI
$47.4B
| $174K | ﹤0.01% |
574
-2,285
| -80% | -$777K |
2026 Q1
2 quarters
|
|
4780
PUT
Lazard
LAZ
$4.39B
| $174K | ﹤0.01% |
4,800
+4,300
| +860% | +$180K |
2015 Q3
44 quarters
|
|
4781
CALL
PMV Pharmaceuticals
PMVP
$91.4M
| $174K | ﹤0.01% |
104,100
+53,100
| +104% | +$68.8K |
2026 Q1
2 quarters
|
|
4782
Kennametal
KMT
$1.87B
| $174K | ﹤0.01% |
5,655
+1,748
| +45% | +$55.7K |
2026 Q1
2 quarters
|
|
4783
PUT
Raymond James Financial
RJF
$32.2B
| $174K | ﹤0.01% |
1,100
+1,000
| +1,000% | +$172K |
2026 Q2
1 quarter
|
|
4784
CALL
Columbia Financial
CLBK
$3.02B
| $174K | ﹤0.01% |
15,700
+15,480
| +7,036% | +$171K |
2026 Q1
2 quarters
|
|
4785
CALL
Terex
TEX
$6.47B
| $174K | ﹤0.01% |
3,300
+2,000
| +154% | +$127K |
2014 Q4
47 quarters
|
|
4786
CALL
Aegon
AEG
$12.5B
| $173K | ﹤0.01% |
20,100
+19,200
| +2,133% | +$175K |
2024 Q4
7 quarters
|
|
4787
PUT
Porch Group
PRCH
$2.44B
| $173K | ﹤0.01% |
10,400
+1,700
| +20% | +$26.6K |
2023 Q4
11 quarters
|
|
4788
Xylem
XYL
$21.6B
| $173K | ﹤0.01% |
1,708
-14,181
| -89% | -$1.62M |
2026 Q2
1 quarter
|
|
4789
PUT
Willis Towers Watson
WTW
$30.3B
| $173K | ﹤0.01% |
600
-2,200
| -79% | -$695K |
2026 Q1
2 quarters
|
|
4790
Morgan Stanley Direct Lending Fund
MSDL
$1.15B
| $173K | ﹤0.01% |
12,685
+3,325
| +36% | +$50.2K |
2026 Q1
2 quarters
|
|
4791
FuelCell Energy
FCEL
$820M
| $173K | ﹤0.01% |
10,526
-127,528
| -92% | -$2.51M |
2025 Q2
5 quarters
|
|
4792
Bicycle Therapeutics
BCYC
$242M
| $173K | ﹤0.01% |
46,923
+11,691
| +33% | +$47.3K |
2026 Q2
1 quarter
|
|
4793
CALL
Nomad Foods
NOMD
$1.63B
| $173K | ﹤0.01% |
16,700
-400
| -2% | -$4.59K |
2022 Q4
15 quarters
|
|
4794
PUT
Northern Dynasty Minerals
NAK
$340M
| $172K | ﹤0.01% |
125,900
-114,000
| -48% | -$180K |
2026 Q1
2 quarters
|
|
4795
PUT
Compass Diversified
CODI
$888M
| $172K | ﹤0.01% |
15,800
+700
| +5% | +$7.68K |
2018 Q2
33 quarters
|
|
4796
CALL
Columbia Sportswear
COLM
$3.61B
| $172K | ﹤0.01% |
3,000
+2,900
| +2,900% | +$172K |
2023 Q4
11 quarters
|
|
4797
PUT
Newell Brands
NWL
$2.45B
| $172K | ﹤0.01% |
32,600
+4,300
| +15% | +$24.5K |
2021 Q2
21 quarters
|
|
4798
PUT
New York Times
NYT
$11.4B
| $172K | ﹤0.01% |
2,700
-2,600
| -49% | -$180K |
2018 Q1
34 quarters
|
|
4799
CALL
Innoviva
INVA
$1.35B
| $172K | ﹤0.01% |
8,100
+5,200
| +179% | +$110K |
2025 Q4
3 quarters
|
|
4800
PUT
NioCorp Developments
NB
$412M
| $172K | ﹤0.01% |
47,700
+33,300
| +231% | +$144K |
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.