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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 | |
|---|---|---|---|---|---|---|---|
2276
DELISTED
ACV Auctions
ACVA
| $1.53M | ﹤0.01% |
146,937
+132,487
| +917% | +$1.07M |
2025 Q3
4 quarters
|
|
2277
Abercrombie & Fitch
ANF
$6.45B
| $1.53M | ﹤0.01% |
11,369
+7,713
| +211% | +$899K |
2025 Q4
3 quarters
|
|
2278
PUT
Unusual Machines
UMAC
$657M
| $1.53M | ﹤0.01% |
62,500
+21,300
| +52% | +$495K |
2025 Q1
6 quarters
|
|
2279
PUT
Sysco
SYY
$37.9B
| $1.53M | ﹤0.01% |
19,600
+1,100
| +6% | +$90.4K |
2015 Q2
45 quarters
|
|
2280
CALL
Cooper Companies
COO
$12B
| $1.53M | ﹤0.01% |
27,000
+2,100
| +8% | +$144K |
2022 Q4
15 quarters
|
|
2281
CALL
Curtiss-Wright
CW
$17.4B
| $1.52M | ﹤0.01% |
2,800
+1,900
| +211% | +$1.25M |
2024 Q3
8 quarters
|
|
2282
Caterpillar
CAT
$275B
| $1.52M | ﹤0.01% |
+1,878
| New | +$1.59M |
2026 Q3
0 quarters
|
|
2283
PUT
Ero Copper
ERO
$3.23B
| $1.52M | ﹤0.01% |
41,500
+7,600
| +22% | +$244K |
2022 Q3
16 quarters
|
|
2284
CALL
Fundrise Innovation Fund
VCX
$850M
| $1.52M | ﹤0.01% |
51,400
+15,500
| +43% | +$668K |
2026 Q2
1 quarter
|
|
2285
CALL
Lineage Inc
LINE
$8.06B
| $1.52M | ﹤0.01% |
44,600
+19,200
| +76% | +$780K |
2024 Q3
8 quarters
|
|
2286
PUT
Embraer S.A. ADS
EMBJ
$14.7B
| $1.52M | ﹤0.01% |
20,200
-3,200
| -14% | -$229K |
2021 Q2
21 quarters
|
|
2287
BlackLine
BL
$1.57B
| $1.52M | ﹤0.01% |
57,319
+41,531
| +263% | +$1.24M |
2026 Q2
1 quarter
|
|
2288
Photronics
PLAB
$1.71B
| $1.52M | ﹤0.01% |
49,389
+4,202
| +9% | +$126K |
2026 Q1
2 quarters
|
|
2289
CALL
TSS Inc
TSSI
$194M
| $1.52M | ﹤0.01% |
155,900
+120,100
| +335% | +$1.17M |
2024 Q4
7 quarters
|
|
2290
PUT
MasTec
MTZ
$15.2B
| $1.52M | ﹤0.01% |
7,100
+1,700
| +31% | +$478K |
2016 Q3
40 quarters
|
|
2291
CALL
Cellebrite
CLBT
$3.19B
| $1.51M | ﹤0.01% |
134,500
+68,900
| +105% | +$917K |
2023 Q4
11 quarters
|
|
2292
CALL
Lightpath Technologies
LPTH
$527M
| $1.51M | ﹤0.01% |
146,700
+112,100
| +324% | +$1.29M |
2025 Q3
4 quarters
|
|
2293
PUT
dLocal
DLO
$4B
| $1.51M | ﹤0.01% |
109,900
+31,400
| +40% | +$461K |
2021 Q2
21 quarters
|
|
2294
PUT
GE HealthCare
GEHC
$37.3B
| $1.51M | ﹤0.01% |
23,100
-33,200
| -59% | -$2.25M |
2026 Q1
2 quarters
|
|
2295
D-Wave Quantum Inc
QBTS
$4.04B
| $1.51M | ﹤0.01% |
91,020
-31,282
| -26% | -$579K |
2025 Q2
5 quarters
|
|
2296
Qiagen
QGEN
$10.4B
| $1.51M | ﹤0.01% |
34,462
+8,460
| +33% | +$359K |
2024 Q4
7 quarters
|
|
2297
PUT
DaVita
DVA
$11.5B
| $1.5M | ﹤0.01% |
8,600
+4,000
| +87% | +$803K |
2014 Q4
47 quarters
|
|
2298
PUT
Sable Offshore Corp
SOC
$155M
| $1.5M | ﹤0.01% |
434,400
+128,900
| +42% | +$575K |
2024 Q3
8 quarters
|
|
2299
CALL
Marsh
MRSH
$98.7B
| $1.5M | ﹤0.01% |
8,800
-6,100
| -41% | -$1.12M |
2017 Q1
38 quarters
|
|
2300
CALL
Western Alliance Bancorporation
WAL
$8.14B
| $1.5M | ﹤0.01% |
20,000
-25,500
| -56% | -$2.05M |
2016 Q1
42 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.