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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 | |
|---|---|---|---|---|---|---|---|
576
PUT
Albemarle
ALB
$11.3B
| $15M | 0.01% |
141,600
-20,700
| -13% | -$2.57M |
2016 Q2
41 quarters
|
|
577
PUT
Wayfair
W
$15.7B
| $15M | 0.01% |
146,000
+17,800
| +14% | +$1.74M |
2015 Q1
46 quarters
|
|
578
CALL
Duke Energy
DUK
$100B
| $15M | 0.01% |
131,300
+58,500
| +80% | +$7.17M |
2014 Q4
47 quarters
|
|
579
PUT
First Majestic Silver
AG
$7.28B
| $14.9M | 0.01% |
845,000
-150,700
| -15% | -$2.78M |
2021 Q1
22 quarters
|
|
580
CALL
Zeta Global
ZETA
$9.47B
| $14.9M | 0.01% |
473,100
-127,800
| -21% | -$3.39M |
2023 Q1
14 quarters
|
|
581
CALL
Semtech
SMTC
$11.7B
| $14.9M | 0.01% |
83,700
+24,300
| +41% | +$3.44M |
2016 Q4
39 quarters
|
|
582
Alphabet (Google) Class C
GOOG
$3.57T
| $14.9M | 0.01% |
43,794
-103,893
| -70% | -$35.8M |
2024 Q1
10 quarters
|
|
583
PUT
Penumbra
PEN
$12.7B
| $14.9M | 0.01% |
46,800
+10,700
| +30% | +$3.43M |
2025 Q3
4 quarters
|
|
584
CALL
DELISTED
Direxion Daily Silver Miners Index Bull 2X Shares
SHNY
| $14.8M | 0.01% |
554,500
-393,000
| -41% | -$10.5M |
2017 Q2
37 quarters
|
|
585
CALL
NIO
NIO
$8.12B
| $14.7M | 0.01% |
4,290,000
+250,100
| +6% | +$1.09M |
2018 Q3
32 quarters
|
|
586
PUT
EQT Corp
EQT
$33B
| $14.7M | 0.01% |
302,500
+33,400
| +12% | +$1.75M |
2016 Q2
41 quarters
|
|
587
CALL
KKR & Co
KKR
$89.7B
| $14.6M | 0.01% |
160,400
-5,600
| -3% | -$572K |
2014 Q4
47 quarters
|
|
588
Booking.com
BKNG
$119B
| $14.6M | 0.01% |
89,669
+22,119
| +33% | +$4.16M |
2023 Q3
12 quarters
|
|
589
CALL
Enphase Energy
ENPH
$3.74B
| $14.6M | 0.01% |
441,800
+101,500
| +30% | +$3.91M |
2018 Q1
34 quarters
|
|
590
CALL
POET Technologies
POET
$967M
| $14.6M | 0.01% |
1,945,800
-1,166,200
| -37% | -$9.31M |
2024 Q2
9 quarters
|
|
591
CALL
US Bancorp Series B Preferred Stock
USB.PRH
$678M
| $14.5M | 0.01% |
251,000
+39,800
| +19% | +$737K |
2021 Q2
21 quarters
|
|
592
PUT
Royal Caribbean
RCL
$89.7B
| $14.5M | 0.01% |
54,400
-121,100
| -69% | -$34.4M |
2021 Q2
21 quarters
|
|
593
CALL
Coeur Mining
CDE
$15.4B
| $14.4M | 0.01% |
819,100
+199,800
| +32% | +$3.63M |
2021 Q2
21 quarters
|
|
594
CALL
Vertex Pharmaceuticals
VRTX
$139B
| $14.2M | 0.01% |
27,200
+6,300
| +30% | +$3.23M |
2021 Q1
22 quarters
|
|
595
Vistra
VST
$45.3B
| $14.2M | 0.01% |
102,539
+46,037
| +81% | +$6.77M |
2025 Q4
3 quarters
|
|
596
PUT
RTX Corp
RTX
$272B
| $14.2M | 0.01% |
76,400
-22,600
| -23% | -$4.63M |
2020 Q1
26 quarters
|
|
597
CALL
Deere & Co
DE
$187B
| $14.2M | 0.01% |
21,100
-19,600
| -48% | -$12.5M |
2014 Q4
47 quarters
|
|
598
CALL
Energy Fuels
UUUU
$1.84B
| $14.1M | 0.01% |
1,276,500
+204,100
| +19% | +$2.68M |
2018 Q1
34 quarters
|
|
599
CALL
Volatility Premium Plus ETF
ZVOL
$22.3M
| $14.1M | 0.01% |
669,000
-50,200
| -7% | -$399K |
2024 Q2
9 quarters
|
|
600
CALL
USA Rare Earth Inc
USAR
$3.1B
| $14M | 0.01% |
996,300
+646,500
| +185% | +$11M |
2025 Q2
5 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.