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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 | |
|---|---|---|---|---|---|---|---|
4201
CALL
Alcon
ALC
$35.2B
| $291K | ﹤0.01% |
4,500
-400
| -8% | -$27.7K |
2019 Q2
29 quarters
|
|
4202
Wabash National
WNC
$463M
| $291K | ﹤0.01% |
23,614
-6,342
| -21% | -$80.8K |
2025 Q4
3 quarters
|
|
4203
CALL
Gran Tierra Energy
GTE
$329M
| $291K | ﹤0.01% |
29,500
+27,300
| +1,241% | +$238K |
2026 Q1
2 quarters
|
|
4204
Vanguard Long-Term Corporate Bond ETF
VCLT
$8.41B
| $291K | ﹤0.01% |
+4,244
| New | +$306K |
2026 Q3
0 quarters
|
|
4205
CALL
Macerich
MAC
$7.13B
| $291K | ﹤0.01% |
13,000
+9,400
| +261% | +$228K |
2026 Q2
1 quarter
|
|
4206
CALL
Neogen
NEOG
$2.44B
| $291K | ﹤0.01% |
22,700
+21,400
| +1,646% | +$243K |
2020 Q4
23 quarters
|
|
4207
iPath Series B S&P 500 VIX Short-Term Futures ETN
VXX
$138M
| $290K | ﹤0.01% |
16,494
-43,448
| -72% | -$859K |
2026 Q2
1 quarter
|
|
4208
PUT
Acadia Pharmaceuticals
ACAD
$3.16B
| $290K | ﹤0.01% |
14,400
+11,800
| +454% | +$317K |
2021 Q1
22 quarters
|
|
4209
CALL
Easterly Government Properties
DEA
$1.04B
| $290K | ﹤0.01% |
12,500
+6,000
| +92% | +$147K |
2021 Q1
22 quarters
|
|
4210
CALL
Tetra Tech
TTEK
$9.9B
| $290K | ﹤0.01% |
8,800
+5,700
| +184% | +$195K |
2023 Q2
13 quarters
|
|
|
AWTM
4211
PUT
DELISTED
AWTM Ultra-Short Duration Enhanced Income ETF
AWTM
| $289K | ﹤0.01% |
10,400
+5,300
| +104% | +$147K |
2024 Q4
7 quarters
|
|
4212
Full Truck Alliance
YMM
$8.95B
| $289K | ﹤0.01% |
34,976
+15,278
| +78% | +$134K |
2025 Q1
6 quarters
|
|
4213
Global E Online
GLBE
$7B
| $289K | ﹤0.01% |
7,271
+5,359
| +280% | +$208K |
2024 Q4
7 quarters
|
|
4214
PUT
Murphy Oil
MUR
$5.27B
| $289K | ﹤0.01% |
7,800
+2,400
| +44% | +$87.2K |
2021 Q2
21 quarters
|
|
4215
JD.com
JD
$37.5B
| $289K | ﹤0.01% |
10,850
-88,361
| -89% | -$2.56M |
2023 Q1
14 quarters
|
|
4216
PUT
Structure Therapeutics
GPCR
$1.45B
| $288K | ﹤0.01% |
9,200
+900
| +11% | +$42.2K |
2023 Q4
11 quarters
|
|
4217
PUT
Weyerhaeuser
WY
$14.9B
| $288K | ﹤0.01% |
15,100
-2,500
| -14% | -$58.3K |
2014 Q4
47 quarters
|
|
4218
CALL
Honda
HMC
$44.6B
| $288K | ﹤0.01% |
9,100
-3,500
| -28% | -$108K |
2018 Q1
34 quarters
|
|
4219
CALL
Ryman Hospitality Properties
RHP
$9.46B
| $287K | ﹤0.01% |
2,400
-2,400
| -50% | -$302K |
2024 Q4
7 quarters
|
|
4220
CALL
PennantPark Floating Rate Capital
PFLT
$661M
| $287K | ﹤0.01% |
41,500
+37,600
| +964% | +$271K |
2026 Q1
2 quarters
|
|
4221
CALL
Hagerty
HGTY
$1.95B
| $287K | ﹤0.01% |
21,300
+18,100
| +566% | +$232K |
2024 Q4
7 quarters
|
|
4222
Beta Technologies Inc
BETA
$5.64B
| $286K | ﹤0.01% |
12,962
-13,170
| -50% | -$276K |
2025 Q4
3 quarters
|
|
4223
Progressive
PGR
$137B
| $285K | ﹤0.01% |
1,375
+653
| +90% | +$141K |
2025 Q4
3 quarters
|
|
4224
CALL
Commault Systems
CVLT
$6.16B
| $285K | ﹤0.01% |
1,900
-36,000
| -95% | -$5.05M |
2023 Q1
14 quarters
|
|
4225
CALL
LCI Industries
LCII
$2.41B
| $284K | ﹤0.01% |
3,400
+3,300
| +3,300% | +$330K |
2026 Q1
2 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.