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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 | |
|---|---|---|---|---|---|---|---|
4501
CALL
Baytex Energy
BTE
$2.94B
| $224K | ﹤0.01% |
49,500
+8,300
| +20% | +$37.3K |
2023 Q2
13 quarters
|
|
4502
SPS Commerce
SPSC
$2.88B
| $224K | ﹤0.01% |
+2,716
| New | +$201K |
2026 Q3
0 quarters
|
|
4503
PUT
USA Compression Partners
USAC
$3.64B
| $224K | ﹤0.01% |
9,000
+2,000
| +29% | +$52.9K |
2021 Q2
21 quarters
|
|
4504
CALL
PennyMac Mortgage Investment
PMT
$650M
| $224K | ﹤0.01% |
28,400
+1,600
| +6% | +$15.2K |
2019 Q1
30 quarters
|
|
4505
REX FANG & Innovation Equity Premium Income ETF
FEPI
$656M
| $223K | ﹤0.01% |
5,214
+1,557
| +43% | +$65.1K |
2026 Q1
2 quarters
|
|
4506
Astrana Health
ASTH
$1.58B
| $223K | ﹤0.01% |
6,273
-7,375
| -54% | -$291K |
2025 Q4
3 quarters
|
|
4507
PUT
Chegg
CHGG
$63.9M
| $223K | ﹤0.01% |
307,100
+2,000
| +0.7% | +$1.69K |
2018 Q1
34 quarters
|
|
4508
Anterix
ATEX
$1.58B
| $223K | ﹤0.01% |
2,839
-2,538
| -47% | -$234K |
2025 Q3
4 quarters
|
|
4509
Toast
TOST
$20.1B
| $223K | ﹤0.01% |
+7,687
| New | +$248K |
2026 Q3
0 quarters
|
|
4510
PUT
Adeia
ADEA
$1.79B
| $223K | ﹤0.01% |
8,700
-61,000
| -88% | -$1.64M |
2025 Q4
3 quarters
|
|
4511
CALL
Hello Group
MOMO
$635M
| $223K | ﹤0.01% |
46,000
+600
| +1% | +$3.36K |
2015 Q2
45 quarters
|
|
4512
PUT
PagSeguro Digital
PAGS
$2.2B
| $222K | ﹤0.01% |
25,000
+15,000
| +150% | +$138K |
2018 Q2
33 quarters
|
|
4513
CALL
Valens Semiconductor
VLN
$158M
| $222K | ﹤0.01% |
118,300
+11,600
| +11% | +$20.7K |
2026 Q1
2 quarters
|
|
4514
Titan Machinery
TITN
$531M
| $222K | ﹤0.01% |
9,635
+6,322
| +191% | +$129K |
2025 Q1
6 quarters
|
|
4515
CALL
A10 Networks
ATEN
$2.06B
| $222K | ﹤0.01% |
8,200
-81,100
| -91% | -$2.38M |
2019 Q2
29 quarters
|
|
4516
CALL
Grupo Aeroportuario Centro Norte
OMAB
$5.28B
| $222K | ﹤0.01% |
+2,300
| New | +$239K |
2026 Q3
0 quarters
|
|
4517
Global X Lithium & Battery Tech ETF
LIT
$1.07B
| $222K | ﹤0.01% |
3,247
+2,233
| +220% | +$161K |
2026 Q2
1 quarter
|
|
4518
PUT
Timken Company
TKR
$7.48B
| $222K | ﹤0.01% |
1,900
-1,900
| -50% | -$244K |
2026 Q2
1 quarter
|
|
4519
CALL
Qfin Holdings
QFIN
$646M
| $222K | ﹤0.01% |
33,100
-11,700
| -26% | -$131K |
2020 Q4
23 quarters
|
|
4520
NOV
NOV
$6.45B
| $222K | ﹤0.01% |
11,836
-12,069
| -50% | -$242K |
2026 Q1
2 quarters
|
|
4521
WW International
WW
$104M
| $222K | ﹤0.01% |
14,334
-6,963
| -33% | -$108K |
2025 Q4
3 quarters
|
|
4522
Gildan
GIL
$6.42B
| $222K | ﹤0.01% |
5,198
-9,726
| -65% | -$503K |
2026 Q1
2 quarters
|
|
4523
CALL
Perma-Pipe International
PPIH
$232M
| $221K | ﹤0.01% |
7,200
+7,100
| +7,100% | +$193K |
2025 Q2
5 quarters
|
|
4524
PUT
AnaptysBio
ANAB
$1.38B
| $221K | ﹤0.01% |
4,400
-9,800
| -69% | -$554K |
2024 Q3
8 quarters
|
|
4525
CALL
Venu Holding Corp
VENU
$63.9M
| $221K | ﹤0.01% |
155,700
+4,900
| +3% | +$9.9K |
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.