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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 | |
|---|---|---|---|---|---|---|---|
626
PUT
Lowe's Companies
LOW
$130B
| $13.2M | 0.01% |
71,700
-52,300
| -42% | -$10.9M |
2021 Q2
21 quarters
|
|
627
CALL
3M
MMM
$97.4B
| $13.2M | 0.01% |
80,200
+8,800
| +12% | +$1.5M |
2021 Q2
21 quarters
|
|
628
PUT
Linde
LIN
$242B
| $13.1M | 0.01% |
27,600
-1,800
| -6% | -$884K |
2018 Q4
31 quarters
|
|
629
CALL
Royal Caribbean
RCL
$89.7B
| $13.1M | 0.01% |
49,200
-1,600
| -3% | -$454K |
2021 Q2
21 quarters
|
|
630
Costco
COST
$482B
| $13M | 0.01% |
14,309
+3,148
| +28% | +$2.94M |
2026 Q2
1 quarter
|
|
631
PUT
Hecla Mining
HL
$9.49B
| $13M | 0.01% |
764,600
+229,500
| +43% | +$4.03M |
2014 Q4
47 quarters
|
|
632
CALL
NXP Semiconductors
NXPI
$67.9B
| $13M | 0.01% |
54,600
+4,000
| +8% | +$975K |
2021 Q2
21 quarters
|
|
633
CALL
CF Industries
CF
$18B
| $13M | 0.01% |
112,500
+54,500
| +94% | +$6.71M |
2014 Q4
47 quarters
|
|
634
PUT
SiriusXM
SIRI
$10.9B
| $12.9M | 0.01% |
498,700
-44,300
| -8% | -$1.29M |
2020 Q1
26 quarters
|
|
635
CALL
Apollo Global Management
APO
$72.6B
| $12.9M | 0.01% |
111,100
-19,400
| -15% | -$2.46M |
2015 Q3
44 quarters
|
|
636
PUT
GRAIL Inc
GRAL
$5.65B
| $12.8M | 0.01% |
91,700
+84,000
| +1,091% | +$6.66M |
2024 Q3
8 quarters
|
|
637
CALL
Galaxy Digital Inc
GLXY
$3.06B
| $12.8M | 0.01% |
562,600
+318,400
| +130% | +$7.43M |
2025 Q3
4 quarters
|
|
638
CALL
Suncor Energy
SU
$79.4B
| $12.8M | 0.01% |
188,500
-147,500
| -44% | -$9.6M |
2021 Q2
21 quarters
|
|
639
PUT
Everpure Inc
P
$35.5B
| $12.8M | 0.01% |
97,700
+62,500
| +178% | +$5.89M |
2015 Q4
43 quarters
|
|
640
PUT
BHP
BHP
$209B
| $12.7M | 0.01% |
150,100
+22,000
| +17% | +$1.92M |
2015 Q1
46 quarters
|
|
641
PUT
Energy Transfer Partners
ET
$67B
| $12.7M | 0.01% |
642,400
+166,000
| +35% | +$3.42M |
2021 Q2
21 quarters
|
|
642
CALL
Skydance Corporation
SKYD
$39.8B
| $12.7M | 0.01% |
1,229,300
+366,000
| +42% | +$3.58M |
2025 Q3
4 quarters
|
|
643
CALL
Danaher
DHR
$166B
| $12.7M | 0.01% |
57,300
-11,200
| -16% | -$2.3M |
2014 Q4
47 quarters
|
|
644
CALL
GlobalFoundries
GFS
$23.9B
| $12.7M | 0.01% |
264,900
+151,900
| +134% | +$7.91M |
2021 Q4
19 quarters
|
|
645
PUT
DELISTED
Roku
ROKU
| $12.7M | 0.01% |
83,200
-34,300
| -29% | -$5.16M |
2021 Q1
22 quarters
|
|
646
SoFi Technologies
SOFI
$21.1B
| $12.6M | 0.01% |
803,146
-378,714
| -32% | -$6.67M |
2024 Q1
10 quarters
|
|
647
CALL
Cadence Design Systems
CDNS
$90.3B
| $12.5M | 0.01% |
37,900
+4,000
| +12% | +$1.31M |
2017 Q1
38 quarters
|
|
648
CALL
ImmunityBio
IBRX
$7.07B
| $12.4M | 0.01% |
1,318,800
+236,100
| +22% | +$1.89M |
2019 Q3
28 quarters
|
|
649
CALL
MPLX
MPLX
$57.5B
| $12.4M | 0.01% |
220,300
+64,900
| +42% | +$3.79M |
2015 Q4
43 quarters
|
|
650
CALL
Tilray
TLRY
$386M
| $12.4M | 0.01% |
3,300,100
-61,500
| -2% | -$267K |
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.