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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 | |
|---|---|---|---|---|---|---|---|
4226
PUT
Innovative Industrial Properties
IIPR
$1.47B
| $284K | ﹤0.01% |
5,400
-32,700
| -86% | -$1.92M |
2019 Q1
30 quarters
|
|
4227
PUT
Lennox International
LII
$12.1B
| $284K | ﹤0.01% |
800
+400
| +100% | +$176K |
2025 Q3
4 quarters
|
|
4228
CALL
Sound Group
SOGP
$45M
| $283K | ﹤0.01% |
25,300
+5,700
| +29% | +$66K |
2025 Q3
4 quarters
|
|
4229
Vanguard FTSE Developed Markets ETF
VEA
$229B
| $283K | ﹤0.01% |
+4,011
| New | +$288K |
2026 Q3
0 quarters
|
|
4230
Lincoln Educational Services
LINC
$696M
| $283K | ﹤0.01% |
12,948
+9,566
| +283% | +$327K |
2026 Q2
1 quarter
|
|
4231
CALL
Gladstone Land Corp
LAND
$290M
| $283K | ﹤0.01% |
29,900
-18,200
| -38% | -$161K |
2018 Q2
33 quarters
|
|
4232
Alpha Architect 1-3 Month Box ETF
BOXX
$14.4B
| $283K | ﹤0.01% |
+2,388
| New | +$281K |
2026 Q3
0 quarters
|
|
4233
CALL
Perion Network
PERI
$369M
| $282K | ﹤0.01% |
32,500
-12,200
| -27% | -$114K |
2019 Q3
28 quarters
|
|
4234
Ralliant Corp
RAL
$7.67B
| $282K | ﹤0.01% |
4,082
-5,234
| -56% | -$353K |
2025 Q4
3 quarters
|
|
4235
CALL
Intrepid Potash
IPI
$442M
| $282K | ﹤0.01% |
8,800
+2,300
| +35% | +$83.6K |
2019 Q3
28 quarters
|
|
4236
Park Aerospace
PKE
$536M
| $282K | ﹤0.01% |
9,497
-2,498
| -21% | -$84.1K |
2025 Q3
4 quarters
|
|
4237
CALL
Textron
TXT
$14.2B
| $282K | ﹤0.01% |
3,700
+3,500
| +1,750% | +$299K |
2014 Q4
47 quarters
|
|
4238
CALL
Prothena Corp
PRTA
$423M
| $282K | ﹤0.01% |
33,600
-67,400
| -67% | -$602K |
2020 Q4
23 quarters
|
|
4239
Emcor
EME
$28.7B
| $281K | ﹤0.01% |
373
+259
| +227% | +$200K |
2025 Q1
6 quarters
|
|
4240
Targa Resources
TRGP
$63.6B
| $281K | ﹤0.01% |
1,038
-2,180
| -68% | -$610K |
2025 Q2
5 quarters
|
|
4241
Air Products & Chemicals
APD
$70.4B
| $280K | ﹤0.01% |
+1,008
| New | +$300K |
2026 Q3
0 quarters
|
|
4242
PUT
Valvoline
VVV
$4.4B
| $280K | ﹤0.01% |
9,300
+8,800
| +1,760% | +$302K |
2025 Q2
5 quarters
|
|
4243
CALL
One Stop Systems
OSS
$112M
| $280K | ﹤0.01% |
32,100
-50,500
| -61% | -$590K |
2021 Q2
21 quarters
|
|
4244
CALL
Grupo Supervielle
SUPV
$507M
| $279K | ﹤0.01% |
39,300
+7,300
| +23% | +$64K |
2022 Q4
15 quarters
|
|
4245
PUT
BBB Foods
TBBB
$8.28B
| $279K | ﹤0.01% |
+5,300
| New | +$244K |
2026 Q3
0 quarters
|
|
4246
PUT
Universal Health Services
UHS
$11.2B
| $279K | ﹤0.01% |
1,600
+900
| +129% | +$151K |
2014 Q4
47 quarters
|
|
4247
PUT
Denison Mines
DNN
$1.86B
| $279K | ﹤0.01% |
107,600
+43,900
| +69% | +$135K |
2021 Q1
22 quarters
|
|
4248
Broadwind
BWEN
$56.1M
| $278K | ﹤0.01% |
66,619
-46,461
| -41% | -$208K |
2024 Q3
8 quarters
|
|
4249
CALL
Sprout Social
SPT
$674M
| $278K | ﹤0.01% |
28,500
+14,700
| +107% | +$141K |
2020 Q3
24 quarters
|
|
4250
Dave Inc
DAVE
$3.55B
| $278K | ﹤0.01% |
866
-837
| -49% | -$310K |
2025 Q3
4 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.