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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 | |
|---|---|---|---|---|---|---|---|
1926
PUT
Viking Therapeutics
VKTX
$3.63B
| $2.14M | ﹤0.01% |
65,600
+18,600
| +40% | +$644K |
2022 Q3
16 quarters
|
|
1927
CALL
Sportradar
SRAD
$3.91B
| $2.14M | ﹤0.01% |
184,900
+15,200
| +9% | +$207K |
2024 Q4
7 quarters
|
|
1928
CALL
Acadia Pharmaceuticals
ACAD
$3.17B
| $2.14M | ﹤0.01% |
106,000
+105,300
| +15,043% | +$2.83M |
2021 Q1
22 quarters
|
|
1929
PUT
Zimmer Biomet
ZBH
$20.3B
| $2.13M | ﹤0.01% |
24,000
+2,400
| +11% | +$227K |
2021 Q2
21 quarters
|
|
1930
PUT
Nano Nuclear Energy
NNE
$622M
| $2.13M | ﹤0.01% |
134,400
+92,200
| +218% | +$1.63M |
2024 Q4
7 quarters
|
|
1931
PUT
Banco Bilbao Vizcaya Argentaria
BBVA
$143B
| $2.13M | ﹤0.01% |
76,300
+13,500
| +21% | +$375K |
2026 Q1
2 quarters
|
|
1932
PUT
Perpetua Resources
PPTA
$2.37B
| $2.12M | ﹤0.01% |
98,500
+43,300
| +78% | +$961K |
2024 Q1
10 quarters
|
|
1933
CALL
Cirrus Logic
CRUS
$6.07B
| $2.12M | ﹤0.01% |
17,700
+15,200
| +608% | +$1.91M |
2014 Q4
47 quarters
|
|
1934
Trade Desk
TTD
$7.56B
| $2.12M | ﹤0.01% |
174,141
+102,569
| +143% | +$1.61M |
2025 Q4
3 quarters
|
|
1935
CALL
Recursion Pharmaceuticals
RXRX
$2.24B
| $2.12M | ﹤0.01% |
512,700
+100,000
| +24% | +$339K |
2026 Q1
2 quarters
|
|
1936
CALL
Air Products & Chemicals
APD
$70.2B
| $2.11M | ﹤0.01% |
7,600
-14,300
| -65% | -$4.25M |
2015 Q1
46 quarters
|
|
1937
Aon
AON
$71.4B
| $2.11M | ﹤0.01% |
+7,632
| New | +$2.58M |
2026 Q3
0 quarters
|
|
1938
BridgeBio Pharma
BBIO
$15.5B
| $2.1M | ﹤0.01% |
31,950
-23,585
| -42% | -$1.84M |
2025 Q4
3 quarters
|
|
1939
CALL
Sibanye-Stillwater
SBSW
$6.51B
| $2.1M | ﹤0.01% |
205,300
-71,000
| -26% | -$738K |
2018 Q4
31 quarters
|
|
1940
PUT
Garmin
GRMN
$56.6B
| $2.09M | ﹤0.01% |
7,300
+6,900
| +1,725% | +$1.91M |
2015 Q1
46 quarters
|
|
1941
Papa John's
PZZA
$632M
| $2.09M | ﹤0.01% |
106,187
+11,691
| +12% | +$307K |
2025 Q4
3 quarters
|
|
1942
CALL
Uniti Group
UNIT
$988M
| $2.09M | ﹤0.01% |
249,400
+21,900
| +10% | +$220K |
2016 Q1
42 quarters
|
|
1943
PUT
Joby Aviation
JOBY
$5.98B
| $2.09M | ﹤0.01% |
345,300
+88,300
| +34% | +$641K |
2021 Q4
19 quarters
|
|
1944
PUT
abrdn Physical Platinum Shares ETF
PPLT
$1.8B
| $2.09M | ﹤0.01% |
135,400
-16,800
| -11% | -$262K |
2025 Q1
6 quarters
|
|
1945
CALL
Almonty Industries
ALM
$2.35B
| $2.08M | ﹤0.01% |
158,400
+131,800
| +495% | +$1.98M |
2026 Q1
2 quarters
|
|
1946
CALL
Pitney Bowes
PBI
$2.16B
| $2.08M | ﹤0.01% |
127,700
-44,500
| -26% | -$768K |
2016 Q4
39 quarters
|
|
1947
Procter & Gamble
PG
$389B
| $2.08M | ﹤0.01% |
+14,345
| New | +$2.1M |
2026 Q3
0 quarters
|
|
1948
PUT
Monster Beverage
MNST
$88.9B
| $2.08M | ﹤0.01% |
49,900
-53,700
| -52% | -$2.49M |
2021 Q2
21 quarters
|
|
1949
PUT
Sprott Uranium Miners ETF
URNM
$1.74B
| $2.07M | ﹤0.01% |
44,800
-2,900
| -6% | -$153K |
2025 Q2
5 quarters
|
|
1950
PUT
Crown Castle
CCI
$37.9B
| $2.07M | ﹤0.01% |
31,000
+2,000
| +7% | +$150K |
2015 Q1
46 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.