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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 | |
|---|---|---|---|---|---|---|---|
1176
PUT
D.R. Horton
DHI
$40B
| $5.14M | ﹤0.01% |
37,600
+7,500
| +25% | +$1.09M |
2014 Q4
47 quarters
|
|
1177
PUT
Fiserv Inc
FISV
$34B
| $5.14M | ﹤0.01% |
113,700
-51,500
| -31% | -$2.64M |
2021 Q1
22 quarters
|
|
1178
PUT
Ares Management
ARES
$31.4B
| $5.13M | ﹤0.01% |
44,200
-5,000
| -10% | -$653K |
2019 Q1
30 quarters
|
|
1179
CALL
Keysight
KEYS
$52B
| $5.13M | ﹤0.01% |
14,100
+7,900
| +127% | +$2.6M |
2017 Q2
37 quarters
|
|
1180
PUT
McCormick & Company Non-Voting
MKC
$12.6B
| $5.13M | ﹤0.01% |
110,500
+2,600
| +2% | +$135K |
2017 Q3
36 quarters
|
|
1181
Kodiak Sciences
KOD
$6.87B
| $5.12M | ﹤0.01% |
54,061
+39,451
| +270% | +$1.63M |
2025 Q2
5 quarters
|
|
1182
CALL
Somnigroup International
SGI
$14.4B
| $5.12M | ﹤0.01% |
82,500
-72,500
| -47% | -$4.91M |
2026 Q1
2 quarters
|
|
1183
CALL
Canadian Imperial Bank of Commerce
CM
$106B
| $5.12M | ﹤0.01% |
46,500
-35,400
| -43% | -$4.13M |
2026 Q1
2 quarters
|
|
1184
CALL
McKesson
MCK
$125B
| $5.12M | ﹤0.01% |
6,000
+2,600
| +76% | +$2.24M |
2021 Q2
21 quarters
|
|
1185
CALL
American Eagle Outfitters
AEO
$3.61B
| $5.12M | ﹤0.01% |
287,900
+110,100
| +62% | +$1.84M |
2026 Q1
2 quarters
|
|
1186
CALL
Factset
FDS
$11.8B
| $5.1M | ﹤0.01% |
18,900
+15,600
| +473% | +$4.29M |
2025 Q2
5 quarters
|
|
1187
PUT
EOG Resources
EOG
$79.7B
| $5.1M | ﹤0.01% |
37,000
-21,800
| -37% | -$3.11M |
2014 Q4
47 quarters
|
|
1188
CALL
Canadian Natural Resources
CNQ
$99.5B
| $5.09M | ﹤0.01% |
108,200
+3,200
| +3% | +$151K |
2021 Q2
21 quarters
|
|
1189
CALL
Eos Energy Enterprises
EOSE
$729M
| $5.09M | ﹤0.01% |
1,661,500
+235,400
| +17% | +$915K |
2020 Q4
23 quarters
|
|
1190
CALL
Motorola Solutions
MSI
$88.5B
| $5.08M | ﹤0.01% |
11,400
+9,400
| +470% | +$4.23M |
2014 Q4
47 quarters
|
|
1191
PUT
Carrier Global
CARR
$44.7B
| $5.07M | ﹤0.01% |
92,500
+6,100
| +7% | +$378K |
2021 Q1
22 quarters
|
|
1192
PUT
Scorpio Tankers
STNG
$4.19B
| $5.07M | ﹤0.01% |
60,600
+23,200
| +62% | +$1.84M |
2021 Q1
22 quarters
|
|
1193
CALL
Permian Resources
PR
$18.7B
| $5.05M | ﹤0.01% |
238,900
-15,100
| -6% | -$325K |
2018 Q2
33 quarters
|
|
1194
CALL
Duolingo
DUOL
$7.74B
| $5.04M | ﹤0.01% |
35,400
-19,200
| -35% | -$2.66M |
2021 Q4
19 quarters
|
|
1195
CALL
Fair Isaac
FICO
$15.6B
| $5.04M | ﹤0.01% |
8,500
-12,600
| -60% | -$13.8M |
2018 Q2
33 quarters
|
|
1196
CALL
DuPont de Nemours
DD
$20.6B
| $5.04M | ﹤0.01% |
45,300
-21,600
| -32% | -$2.94M |
2014 Q4
47 quarters
|
|
1197
CALL
Viavi Solutions
VIAV
$8.12B
| $5.03M | ﹤0.01% |
120,100
+9,600
| +9% | +$373K |
2023 Q4
11 quarters
|
|
1198
CALL
Amprius Technologies
AMPX
$1.25B
| $4.99M | ﹤0.01% |
515,900
+52,100
| +11% | +$544K |
2022 Q4
15 quarters
|
|
1199
CALL
ATI
ATI
$25.5B
| $4.98M | ﹤0.01% |
26,300
-5,500
| -17% | -$1.1M |
2016 Q1
42 quarters
|
|
1200
PUT
RH
RH
$2.57B
| $4.96M | ﹤0.01% |
40,700
+14,800
| +57% | +$2.34M |
2014 Q4
47 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.