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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 | |
|---|---|---|---|---|---|---|---|
3526
GigaCloud Technology
GCT
$2.36B
| $517K | ﹤0.01% |
+10,003
| New | +$464K |
2026 Q3
0 quarters
|
|
3527
PUT
Valley National Bancorp
VLY
$7.94B
| $516K | ﹤0.01% |
40,900
-27,000
| -40% | -$383K |
2018 Q2
33 quarters
|
|
3528
CALL
Methode Electronics
MEI
$406M
| $516K | ﹤0.01% |
37,400
+2,500
| +7% | +$38.5K |
2023 Q3
12 quarters
|
|
3529
PUT
BitGo Holdings
BTGO
$473M
| $515K | ﹤0.01% |
69,600
+30,500
| +78% | +$187K |
2026 Q1
2 quarters
|
|
3530
PUT
IES Holdings
IESC
$7.13B
| $514K | ﹤0.01% |
1,600
-400
| -20% | -$132K |
2026 Q2
1 quarter
|
|
3531
CALL
Noble Corp
NE
$6.84B
| $513K | ﹤0.01% |
12,300
-27,100
| -69% | -$1.17M |
2022 Q1
18 quarters
|
|
3532
PUT
Pegasystems
PEGA
$5.28B
| $513K | ﹤0.01% |
15,400
-34,700
| -69% | -$1.15M |
2023 Q3
12 quarters
|
|
3533
PUT
Alignment Healthcare
ALHC
$1.52B
| $512K | ﹤0.01% |
62,800
+61,700
| +5,609% | +$922K |
2024 Q4
7 quarters
|
|
3534
PUT
Enovix
ENVX
$362M
| $512K | ﹤0.01% |
220,875
-282,875
| -56% | -$887K |
2021 Q4
19 quarters
|
|
3535
CALL
Invesco CurrencyShares Euro Currency Trust
FXE
$326M
| $512K | ﹤0.01% |
4,900
-2,300
| -32% | -$244K |
2015 Q1
46 quarters
|
|
3536
PUT
Magnolia Oil & Gas
MGY
$6.47B
| $512K | ﹤0.01% |
21,800
+19,600
| +891% | +$508K |
2020 Q4
23 quarters
|
|
3537
Cleveland-Cliffs
CLF
$7.15B
| $512K | ﹤0.01% |
+46,495
| New | +$528K |
2026 Q3
0 quarters
|
|
3538
CALL
Monte Rosa Therapeutics
GLUE
$798M
| $512K | ﹤0.01% |
42,900
+36,500
| +570% | +$626K |
2022 Q4
15 quarters
|
|
3539
PUT
Aurinia Pharmaceuticals
AUPH
$2.14B
| $512K | ﹤0.01% |
31,600
-2,100
| -6% | -$33.5K |
2021 Q2
21 quarters
|
|
3540
PUT
Dycom Industries
DY
$6.56B
| $511K | ﹤0.01% |
1,900
+600
| +46% | +$219K |
2022 Q3
16 quarters
|
|
3541
PUT
Capri Holdings
CPRI
$2.15B
| $511K | ﹤0.01% |
36,200
-7,500
| -17% | -$115K |
2014 Q4
47 quarters
|
|
3542
Sanmina
SANM
$8.15B
| $511K | ﹤0.01% |
2,376
-9,298
| -80% | -$1.89M |
2026 Q2
1 quarter
|
|
3543
CALL
Bumble
BMBL
$929M
| $510K | ﹤0.01% |
193,900
-115,200
| -37% | -$331K |
2021 Q1
22 quarters
|
|
3544
PUT
Bright Horizons
BFAM
$2.55B
| $510K | ﹤0.01% |
8,000
+7,800
| +3,900% | +$562K |
2026 Q1
2 quarters
|
|
3545
ProShares UltraShort S&P500
SDS
$399M
| $510K | ﹤0.01% |
9,346
-867
| -8% | -$48K |
2025 Q4
3 quarters
|
|
3546
MasTec
MTZ
$14.4B
| $509K | ﹤0.01% |
+2,385
| New | +$670K |
2026 Q3
0 quarters
|
|
3547
PUT
Agilon Health
AGL
$1.85B
| $509K | ﹤0.01% |
6,400
-17,300
| -73% | -$1.68M |
2026 Q2
1 quarter
|
|
3548
CALL
Globus Medical
GMED
$9.6B
| $509K | ﹤0.01% |
6,800
+6,300
| +1,260% | +$499K |
2017 Q3
36 quarters
|
|
3549
PUT
First Watch Restaurant Group
FWRG
$788M
| $508K | ﹤0.01% |
50,000
+11,600
| +30% | +$139K |
2026 Q1
2 quarters
|
|
3550
Conagra Brands
CAG
$7.02B
| $508K | ﹤0.01% |
37,773
-71,579
| -65% | -$1.07M |
2026 Q2
1 quarter
|
|
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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.