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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 | |
|---|---|---|---|---|---|---|---|
4901
CALL
Euronet Worldwide
EEFT
$2.57B
| $157K | ﹤0.01% |
2,500
+200
| +9% | +$14.6K |
2025 Q2
5 quarters
|
|
4902
PUT
Arvinas
ARVN
$450M
| $157K | ﹤0.01% |
20,300
-4,200
| -17% | -$36K |
2020 Q2
25 quarters
|
|
4903
CALL
Aura Biosciences
AURA
$740M
| $157K | ﹤0.01% |
25,000
+15,000
| +150% | +$107K |
2026 Q2
1 quarter
|
|
4904
PUT
MarineMax
HZO
$1.17B
| $157K | ﹤0.01% |
3,000
-400
| -12% | -$18K |
2019 Q4
27 quarters
|
|
4905
PUT
Nuvation Bio
NUVB
$1.43B
| $157K | ﹤0.01% |
28,000
-15,700
| -36% | -$98.5K |
2025 Q3
4 quarters
|
|
4906
PUT
Old Republic International
ORI
$9.6B
| $157K | ﹤0.01% |
4,200
+500
| +14% | +$20.8K |
2021 Q2
21 quarters
|
|
4907
CALL
Alpha Teknova
TKNO
$522M
| $157K | ﹤0.01% |
17,600
+14,600
| +487% | +$96.9K |
2025 Q4
3 quarters
|
|
4908
PUT
Cellebrite
CLBT
$2.74B
| $157K | ﹤0.01% |
13,900
-700
| -5% | -$9.32K |
2024 Q1
10 quarters
|
|
4909
CALL
Ballard Power Systems
BLDP
$492M
| $156K | ﹤0.01% |
76,700
-411,000
| -84% | -$1.06M |
2025 Q3
4 quarters
|
|
|
JMKE
4910
PUT
Jersey Mike's Subs
JMKE
$6.31B
| $156K | ﹤0.01% |
+9,300
| New | +$197K |
2026 Q3
0 quarters
|
|
4911
CALL
ACI Worldwide
ACIW
$6.14B
| $156K | ﹤0.01% |
+3,200
| New | +$172K |
2026 Q3
0 quarters
|
|
4912
Aura Minerals Inc
AUGO
$6.54B
| $156K | ﹤0.01% |
1,987
-1,718
| -46% | -$126K |
2026 Q1
2 quarters
|
|
4913
PUT
Power Solutions International
PSIX
$909M
| $156K | ﹤0.01% |
3,400
+3,200
| +1,600% | +$119K |
2025 Q3
4 quarters
|
|
4914
PUT
Invesco DB Base Metals Fund
DBB
$348M
| $156K | ﹤0.01% |
5,400
-13,800
| -72% | -$348K |
2026 Q1
2 quarters
|
|
4915
Avient
AVNT
$4.12B
| $156K | ﹤0.01% |
+3,881
| New | +$158K |
2026 Q3
0 quarters
|
|
4916
PUT
Cirrus Logic
CRUS
$6.07B
| $156K | ﹤0.01% |
1,300
+1,100
| +550% | +$138K |
2026 Q1
2 quarters
|
|
4917
Howard Hughes
HHH
$4.94B
| $156K | ﹤0.01% |
2,118
-5,945
| -74% | -$398K |
2026 Q2
1 quarter
|
|
4918
PUT
Millrose Properties Inc
MRP
$4.26B
| $156K | ﹤0.01% |
6,000
+1,200
| +25% | +$35K |
2025 Q1
6 quarters
|
|
4919
PUT
Frontier Group Holdings
ULCC
$1.77B
| $156K | ﹤0.01% |
26,100
-31,900
| -55% | -$203K |
2025 Q4
3 quarters
|
|
4920
BNB Standard Corporation Common Stock
BNC
$210M
| $156K | ﹤0.01% |
26,443
+20,045
| +313% | +$70.6K |
2025 Q3
4 quarters
|
|
4921
Global X Defense Tech ETF
SHLD
$6.17B
| $156K | ﹤0.01% |
2,591
+1,203
| +87% | +$77K |
2025 Q2
5 quarters
|
|
4922
PUT
ManpowerGroup
MAN
$2.14B
| $156K | ﹤0.01% |
2,800
-10,000
| -78% | -$542K |
2023 Q4
11 quarters
|
|
4923
AirSculpt Technologies
AIRS
$53.2M
| $155K | ﹤0.01% |
88,232
+77,137
| +695% | +$262K |
2026 Q1
2 quarters
|
|
4924
Defiance Daily Target 2x Long OKLO ETF
OKLL
$192M
| $155K | ﹤0.01% |
16,221
+15,678
| +2,887% | +$225K |
2026 Q2
1 quarter
|
|
4925
PUT
High Templar Tech Ltd
HTT
$256M
| $155K | ﹤0.01% |
65,100
+57,700
| +780% | +$146K |
2024 Q4
7 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.