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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 | |
|---|---|---|---|---|---|---|---|
3251
Similarweb
SMWB
$702M
| $647K | ﹤0.01% |
83,364
+50,298
| +152% | +$390K |
2025 Q1
6 quarters
|
|
3252
ProShares VIX Mid-Term Futures ETF
VIXM
$39.7M
| $646K | ﹤0.01% |
49,976
+29,248
| +141% | +$407K |
2024 Q4
7 quarters
|
|
3253
PUT
Atlas Energy Solutions
AESI
$689M
| $645K | ﹤0.01% |
53,700
-10,300
| -16% | -$132K |
2025 Q1
6 quarters
|
|
3254
CALL
Magna International
MGA
$16.1B
| $643K | ﹤0.01% |
10,100
-900
| -8% | -$60K |
2015 Q4
43 quarters
|
|
3255
CALL
Vaxcyte
PCVX
$10.2B
| $643K | ﹤0.01% |
11,300
-1,700
| -13% | -$99.1K |
2022 Q2
17 quarters
|
|
3256
PUT
Transmedics
TMDX
$3.2B
| $643K | ﹤0.01% |
7,700
-18,400
| -70% | -$1.51M |
2021 Q1
22 quarters
|
|
3257
CALL
MoonLake Immunotherapeutics
MLTX
$1.1B
| $642K | ﹤0.01% |
54,900
+600
| +1% | +$9.8K |
2023 Q3
12 quarters
|
|
3258
Coca-Cola Europacific Partners
CCEP
$51.3B
| $641K | ﹤0.01% |
+6,305
| New | +$668K |
2026 Q3
0 quarters
|
|
3259
Academy Sports + Outdoors
ASO
$4.14B
| $641K | ﹤0.01% |
13,333
-10,292
| -44% | -$490K |
2026 Q1
2 quarters
|
|
3260
Tectonic Therapeutic
TECX
$411M
| $641K | ﹤0.01% |
27,520
+27,081
| +6,169% | +$848K |
2025 Q3
4 quarters
|
|
3261
PUT
Glaukos
GKOS
$14.6B
| $640K | ﹤0.01% |
3,900
+3,400
| +680% | +$569K |
2018 Q2
33 quarters
|
|
3262
CALL
Return Stacked Bonds & Managed Futures ETF
RSBT
$160M
| $640K | ﹤0.01% |
18,800
+7,400
| +65% | +$141K |
2023 Q2
13 quarters
|
|
3263
CALL
Progress Software
PRGS
$1.78B
| $640K | ﹤0.01% |
16,000
+3,900
| +32% | +$161K |
2022 Q2
17 quarters
|
|
3264
PUT
Aptiv
APTV
$7.86B
| $639K | ﹤0.01% |
15,900
+2,700
| +20% | +$136K |
2016 Q2
41 quarters
|
|
3265
WEC Energy
WEC
$38.7B
| $638K | ﹤0.01% |
6,334
+4,169
| +193% | +$454K |
2026 Q2
1 quarter
|
|
3266
DELISTED
Churchill Capital Corp XI
CCXI
| $638K | ﹤0.01% |
+54,916
| New | +$792K |
2026 Q3
0 quarters
|
|
3267
Ezcorp Inc
EZPW
$1.66B
| $637K | ﹤0.01% |
21,393
+6,396
| +43% | +$201K |
2025 Q4
3 quarters
|
|
3268
CALL
Coursera
COUR
$902M
| $636K | ﹤0.01% |
128,300
-87,600
| -41% | -$492K |
2021 Q2
21 quarters
|
|
3269
CALL
Agenus
AGEN
$311M
| $636K | ﹤0.01% |
64,000
+46,100
| +258% | +$318K |
2018 Q1
34 quarters
|
|
3270
CALL
Lincoln Electric
LECO
$15.4B
| $635K | ﹤0.01% |
2,400
-1,900
| -44% | -$506K |
2022 Q2
17 quarters
|
|
3271
CALL
Verastem
VSTM
$1.06B
| $634K | ﹤0.01% |
78,800
+7,500
| +11% | +$50.3K |
2018 Q1
34 quarters
|
|
3272
CALL
Lamar Advertising Co
LAMR
$16.2B
| $634K | ﹤0.01% |
4,400
+3,200
| +267% | +$492K |
2016 Q3
40 quarters
|
|
3273
PUT
Trimble
TRMB
$12.8B
| $634K | ﹤0.01% |
11,100
-5,900
| -35% | -$335K |
2017 Q1
38 quarters
|
|
3274
Hinge Health
HNGE
$9.8B
| $633K | ﹤0.01% |
6,508
-10,691
| -62% | -$937K |
2026 Q1
2 quarters
|
|
3275
Kaspi.kz JSC
KSPI
$16.8B
| $633K | ﹤0.01% |
6,726
+2,459
| +58% | +$235K |
2025 Q2
5 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.