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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 | |
|---|---|---|---|---|---|---|---|
2226
Ultragenyx Pharmaceutical
RARE
$1.7B
| $1.61M | ﹤0.01% |
+106,891
| New | +$2.57M |
2026 Q3
0 quarters
|
|
2227
CALL
PennyMac Financial
PFSI
$3.24B
| $1.6M | ﹤0.01% |
26,000
+9,500
| +58% | +$719K |
2019 Q3
28 quarters
|
|
2228
CALL
Floor & Decor
FND
$5.32B
| $1.6M | ﹤0.01% |
35,000
+29,700
| +560% | +$1.59M |
2017 Q2
37 quarters
|
|
2229
PUT
ACM Research
ACMR
$3.67B
| $1.6M | ﹤0.01% |
19,800
+2,600
| +15% | +$211K |
2020 Q1
26 quarters
|
|
2230
CALL
Lamb Weston
LW
$7.84B
| $1.6M | ﹤0.01% |
38,400
-37,800
| -50% | -$1.87M |
2018 Q2
33 quarters
|
|
2231
PUT
Klaviyo
KVYO
$5.98B
| $1.6M | ﹤0.01% |
101,700
+28,800
| +40% | +$504K |
2023 Q3
12 quarters
|
|
2232
PUT
CMB.TECH NV
CMBT
$5.04B
| $1.6M | ﹤0.01% |
84,500
+27,000
| +47% | +$466K |
2025 Q2
5 quarters
|
|
2233
PUT
Arch Capital
ACGL
$35.5B
| $1.6M | ﹤0.01% |
17,300
+4,200
| +32% | +$416K |
2019 Q4
27 quarters
|
|
2234
CALL
JFrog
FROG
$13.6B
| $1.59M | ﹤0.01% |
16,400
+6,900
| +73% | +$619K |
2020 Q3
24 quarters
|
|
2235
PUT
Cencora
COR
$66.8B
| $1.59M | ﹤0.01% |
5,300
+4,800
| +960% | +$1.51M |
2014 Q4
47 quarters
|
|
2236
Howmet Aerospace
HWM
$89.1B
| $1.59M | ﹤0.01% |
+7,032
| New | +$1.85M |
2026 Q3
0 quarters
|
|
2237
CALL
LPL Financial
LPLA
$23.5B
| $1.59M | ﹤0.01% |
5,200
+4,500
| +643% | +$1.53M |
2016 Q3
40 quarters
|
|
2238
Constellation Energy
CEG
$97.3B
| $1.59M | ﹤0.01% |
+6,248
| New | +$1.67M |
2026 Q3
0 quarters
|
|
2239
PUT
ProShares UltraShort Health Care
RXD
$2.72M
| $1.58M | ﹤0.01% |
45,700
-34,000
| -43% | -$524K |
2015 Q1
46 quarters
|
|
2240
CALL
Crocs
CROX
$7.32B
| $1.58M | ﹤0.01% |
13,500
+1,000
| +8% | +$126K |
2017 Q2
37 quarters
|
|
2241
PUT
MGM Resorts International
MGM
$8.47B
| $1.58M | ﹤0.01% |
51,000
-13,800
| -21% | -$589K |
2021 Q1
22 quarters
|
|
2242
CALL
PagSeguro Digital
PAGS
$2.19B
| $1.58M | ﹤0.01% |
177,700
-389,100
| -69% | -$3.59M |
2018 Q2
33 quarters
|
|
2243
PUT
Main Street Capital
MAIN
$5.32B
| $1.58M | ﹤0.01% |
28,700
+14,000
| +95% | +$783K |
2017 Q3
36 quarters
|
|
2244
CALL
Netskope Inc
NTSK
$9.14B
| $1.57M | ﹤0.01% |
90,200
-70,000
| -44% | -$1.02M |
2025 Q3
4 quarters
|
|
2245
CALL
Goodyear
GT
$1.16B
| $1.57M | ﹤0.01% |
316,100
+66,400
| +27% | +$414K |
2018 Q2
33 quarters
|
|
2246
CALL
NETGEAR
NTGR
$527M
| $1.57M | ﹤0.01% |
70,700
+46,200
| +189% | +$1.04M |
2023 Q3
12 quarters
|
|
2247
Caesars Entertainment
CZR
$5.97B
| $1.57M | ﹤0.01% |
52,949
-13,542
| -20% | -$403K |
2026 Q1
2 quarters
|
|
2248
PUT
Vista Energy
VIST
$6.19B
| $1.57M | ﹤0.01% |
24,000
+12,600
| +111% | +$865K |
2022 Q1
18 quarters
|
|
2249
CALL
Paycom
PAYC
$10.9B
| $1.57M | ﹤0.01% |
7,200
-500
| -6% | -$97.6K |
2015 Q3
44 quarters
|
|
2250
CALL
Cronos Group
CRON
$1.26B
| $1.56M | ﹤0.01% |
473,600
-108,200
| -19% | -$334K |
2021 Q1
22 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.