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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 | |
|---|---|---|---|---|---|---|---|
2626
PUT
Aris Mining
ARIS
$3.21B
| $1.1M | ﹤0.01% |
63,000
+52,200
| +483% | +$901K |
2025 Q4
3 quarters
|
|
2627
PUT
Agree Realty
ADC
$9.08B
| $1.1M | ﹤0.01% |
16,400
+12,900
| +369% | +$961K |
2021 Q2
21 quarters
|
|
2628
Opendoor
OPEN
$1.27B
| $1.09M | ﹤0.01% |
462,831
-298,390
| -39% | -$1.07M |
2025 Q4
3 quarters
|
|
2629
PUT
Viatris
VTRS
$24.1B
| $1.09M | ﹤0.01% |
61,700
-132,000
| -68% | -$2.23M |
2021 Q2
21 quarters
|
|
2630
PUT
Host Hotels & Resorts
HST
$17.7B
| $1.09M | ﹤0.01% |
48,700
+42,200
| +649% | +$975K |
2016 Q2
41 quarters
|
|
2631
CALL
Newsmax Inc
NMAX
$1000M
| $1.09M | ﹤0.01% |
100,800
+50,700
| +101% | +$488K |
2025 Q2
5 quarters
|
|
2632
Liberty Media Corporation Series C Common Stock
FWONK
$28.3B
| $1.09M | ﹤0.01% |
+11,791
| New | +$1.16M |
2026 Q3
0 quarters
|
|
2633
CareDx
CDNA
$4.26B
| $1.09M | ﹤0.01% |
16,761
+16,066
| +2,312% | +$728K |
2026 Q2
1 quarter
|
|
2634
CALL
JBT Marel
JBTM
$6.46B
| $1.09M | ﹤0.01% |
10,300
-700
| -6% | -$87K |
2023 Q1
14 quarters
|
|
2635
CALL
Elemental Royalty Corp
ELE
$1.08B
| $1.09M | ﹤0.01% |
56,900
-57,400
| -50% | -$1.09M |
2026 Q2
1 quarter
|
|
2636
Mercury Insurance
MCY
$4.78B
| $1.09M | ﹤0.01% |
10,993
+7,519
| +216% | +$789K |
2026 Q2
1 quarter
|
|
2637
CALL
BridgeBio Pharma
BBIO
$15.5B
| $1.09M | ﹤0.01% |
16,500
-20,000
| -55% | -$1.56M |
2020 Q4
23 quarters
|
|
2638
CALL
Ziff Davis
ZD
$1.7B
| $1.08M | ﹤0.01% |
19,100
+16,200
| +559% | +$887K |
2025 Q3
4 quarters
|
|
2639
CALL
TransDigm Group
TDG
$68B
| $1.08M | ﹤0.01% |
1,000
+500
| +100% | +$601K |
2021 Q1
22 quarters
|
|
2640
CALL
Alexandria Real Estate Equities
ARE
$7.85B
| $1.08M | ﹤0.01% |
22,800
+9,400
| +70% | +$477K |
2026 Q1
2 quarters
|
|
2641
Ginkgo Bioworks
DNA
$664M
| $1.08M | ﹤0.01% |
84,325
+66,330
| +369% | +$540K |
2026 Q1
2 quarters
|
|
2642
PUT
PAR Technology
PAR
$921M
| $1.08M | ﹤0.01% |
78,600
+49,900
| +174% | +$862K |
2019 Q2
29 quarters
|
|
2643
CALL
Vanguard Total Bond Market
BND
$166B
| $1.08M | ﹤0.01% |
15,400
+4,600
| +43% | +$332K |
2018 Q2
33 quarters
|
|
2644
PUT
WEX
WEX
$5.99B
| $1.08M | ﹤0.01% |
6,400
-100
| -2% | -$18.1K |
2026 Q2
1 quarter
|
|
2645
CALL
Altimmune
ALT
$375M
| $1.08M | ﹤0.01% |
377,000
-91,600
| -20% | -$281K |
2021 Q1
22 quarters
|
|
2646
PUT
Hycroft Mining Holding Corp
HYMC
$1.74B
| $1.08M | ﹤0.01% |
56,600
+33,500
| +145% | +$755K |
2022 Q1
18 quarters
|
|
2647
CALL
InterDigital
IDCC
$7.74B
| $1.08M | ﹤0.01% |
3,300
+700
| +27% | +$219K |
2021 Q2
21 quarters
|
|
2648
CALL
Garrett Motion
GTX
$3.88B
| $1.08M | ﹤0.01% |
41,300
-8,100
| -16% | -$234K |
2021 Q2
21 quarters
|
|
2649
CALL
Valley National Bancorp
VLY
$7.92B
| $1.07M | ﹤0.01% |
85,100
-44,700
| -34% | -$634K |
2018 Q2
33 quarters
|
|
2650
CALL
Harmony Gold Mining
HMY
$10.1B
| $1.07M | ﹤0.01% |
60,600
-100
| -0.2% | -$1.83K |
2018 Q3
32 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.