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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 | |
|---|---|---|---|---|---|---|---|
4426
PUT
Avino Silver & Gold Mines
ASM
$728M
| $240K | ﹤0.01% |
43,200
+32,000
| +286% | +$207K |
2026 Q1
2 quarters
|
|
4427
CALL
Sixth Street Specialty
TSLX
$1.69B
| $240K | ﹤0.01% |
13,300
+10,700
| +412% | +$192K |
2026 Q1
2 quarters
|
|
4428
PUT
B&G Foods
BGS
$284M
| $240K | ﹤0.01% |
83,500
-5,500
| -6% | -$19.1K |
2015 Q4
43 quarters
|
|
4429
CALL
Ecopetrol
EC
$31.7B
| $239K | ﹤0.01% |
14,500
-117,600
| -89% | -$1.96M |
2017 Q4
35 quarters
|
|
4430
CALL
Enliven Therapeutics
ELVN
$3.59B
| $238K | ﹤0.01% |
5,200
+5,000
| +2,500% | +$272K |
2026 Q2
1 quarter
|
|
4431
PUT
Smurfit Westrock
SW
$22.2B
| $238K | ﹤0.01% |
5,400
| – | – |
2024 Q3
8 quarters
|
|
4432
PUT
Camden National
CAC
$1B
| $238K | ﹤0.01% |
4,300
-200
| -4% | -$11.3K |
2026 Q1
2 quarters
|
|
4433
Corsair Gaming
CRSR
$1.29B
| $238K | ﹤0.01% |
+17,622
| New | +$204K |
2026 Q3
0 quarters
|
|
4434
CALL
Vestis
VSTS
$1.86B
| $238K | ﹤0.01% |
17,800
-53,600
| -75% | -$748K |
2023 Q4
11 quarters
|
|
4435
PUT
BTQ Technologies Corp
BTQ
$210M
| $238K | ﹤0.01% |
82,000
-7,800
| -9% | -$26.8K |
2025 Q4
3 quarters
|
|
4436
CALL
Lightspeed Commerce
LSPD
$1.32B
| $237K | ﹤0.01% |
24,300
-3,500
| -13% | -$35.8K |
2020 Q4
23 quarters
|
|
4437
PUT
ProShares Ultra SpaceX
SPCF
$62.8M
| $237K | ﹤0.01% |
13,900
+8,100
| +140% | +$124K |
2026 Q2
1 quarter
|
|
4438
Xometry
XMTR
$6.89B
| $237K | ﹤0.01% |
+2,306
| New | +$213K |
2026 Q3
0 quarters
|
|
4439
CALL
Gladstone Investment Corp
GAIN
$593M
| $237K | ﹤0.01% |
15,200
-46,000
| -75% | -$746K |
2020 Q1
26 quarters
|
|
4440
CALL
Ascent Industries
ACNT
$117M
| $237K | ﹤0.01% |
+16,800
| New | +$254K |
2026 Q3
0 quarters
|
|
4441
PUT
Extra Space Storage
EXR
$33.1B
| $237K | ﹤0.01% |
1,800
+1,500
| +500% | +$215K |
2016 Q4
39 quarters
|
|
4442
PUT
Xperi
XPER
$296M
| $236K | ﹤0.01% |
42,900
+11,500
| +37% | +$76.9K |
2026 Q1
2 quarters
|
|
4443
PUT
Cannae Holdings
CNNE
$750M
| $236K | ﹤0.01% |
15,400
| – | – |
2026 Q1
2 quarters
|
|
4444
PUT
Open Text
OTEX
$6B
| $235K | ﹤0.01% |
10,500
-20,400
| -66% | -$485K |
2022 Q3
16 quarters
|
|
4445
Assured Guaranty
AGO
$3.29B
| $235K | ﹤0.01% |
+3,469
| New | +$269K |
2026 Q3
0 quarters
|
|
4446
PUT
MannKind Corp
MNKD
$1.33B
| $235K | ﹤0.01% |
60,200
-14,800
| -20% | -$58K |
2021 Q2
21 quarters
|
|
4447
CALL
BellRing Brands
BRBR
$1.23B
| $235K | ﹤0.01% |
30,500
-51,500
| -63% | -$568K |
2025 Q2
5 quarters
|
|
4448
PUT
Kyivstar Group
KYIV
$2.88B
| $234K | ﹤0.01% |
19,000
+6,000
| +46% | +$82.5K |
2025 Q3
4 quarters
|
|
4449
PUT
Zai Lab
ZLAB
$3.05B
| $234K | ﹤0.01% |
8,900
+2,100
| +31% | +$48.5K |
2021 Q1
22 quarters
|
|
4450
PUT
SharkNinja
SN
$31.9B
| $234K | ﹤0.01% |
1,300
-3,200
| -71% | -$540K |
2026 Q2
1 quarter
|
|
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.