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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 | |
|---|---|---|---|---|---|---|---|
2351
CALL
Fomento Económico Mexicano
FMX
$45.2B
| $1.42M | ﹤0.01% |
12,000
+11,900
| +11,900% | +$1.46M |
2026 Q1
2 quarters
|
|
2352
ServiceTitan Inc
TTAN
$7.89B
| $1.42M | ﹤0.01% |
21,605
+16,165
| +297% | +$1.26M |
2026 Q2
1 quarter
|
|
2353
PUT
Banco Santander
SAN
$180B
| $1.42M | ﹤0.01% |
102,700
+8,900
| +9% | +$127K |
2021 Q1
22 quarters
|
|
2354
PUT
SL Green Realty
SLG
$3.53B
| $1.42M | ﹤0.01% |
29,000
-71,400
| -71% | -$3.81M |
2017 Q1
38 quarters
|
|
2355
CALL
Ultra Clean Holdings
UCTT
$2.38B
| $1.42M | ﹤0.01% |
17,500
+15,500
| +775% | +$1.29M |
2021 Q2
21 quarters
|
|
2356
PUT
Stanley Black & Decker
SWK
$17.2B
| $1.42M | ﹤0.01% |
16,000
+3,300
| +26% | +$310K |
2014 Q4
47 quarters
|
|
2357
CALL
Freshpet
FRPT
$3.12B
| $1.42M | ﹤0.01% |
24,600
+2,500
| +11% | +$159K |
2017 Q2
37 quarters
|
|
2358
CALL
Innovative Industrial Properties
IIPR
$1.51B
| $1.41M | ﹤0.01% |
26,800
+5,900
| +28% | +$346K |
2019 Q1
30 quarters
|
|
2359
New Era Energy & Digital Inc
NUAI
$273M
| $1.41M | ﹤0.01% |
210,064
-17,878
| -8% | -$95.2K |
2026 Q1
2 quarters
|
|
2360
PUT
Toyota
TM
$251B
| $1.41M | ﹤0.01% |
7,700
-1,600
| -17% | -$300K |
2014 Q4
47 quarters
|
|
2361
DHT Holdings
DHT
$3.48B
| $1.41M | ﹤0.01% |
62,440
-76,927
| -55% | -$1.5M |
2026 Q2
1 quarter
|
|
2362
CALL
ODDITY Tech
ODD
$918M
| $1.41M | ﹤0.01% |
75,500
+14,900
| +25% | +$234K |
2023 Q3
12 quarters
|
|
2363
Prologis
PLD
$124B
| $1.41M | ﹤0.01% |
+10,838
| New | +$1.52M |
2026 Q3
0 quarters
|
|
2364
CALL
Delek US
DK
$4.07B
| $1.41M | ﹤0.01% |
19,700
+13,600
| +223% | +$909K |
2016 Q2
41 quarters
|
|
2365
PUT
TPG
TPG
$8.84B
| $1.4M | ﹤0.01% |
31,800
-159,000
| -83% | -$7.49M |
2022 Q1
18 quarters
|
|
2366
PUT
BBVA Argentina
BBAR
$2.18B
| $1.4M | ﹤0.01% |
109,200
-8,500
| -7% | -$141K |
2016 Q2
41 quarters
|
|
2367
Lemonade
LMND
$3.17B
| $1.4M | ﹤0.01% |
31,060
+5,100
| +20% | +$284K |
2024 Q3
8 quarters
|
|
2368
CALL
OR Royalties Inc
OR
$6.67B
| $1.4M | ﹤0.01% |
40,800
+11,000
| +37% | +$366K |
2025 Q3
4 quarters
|
|
2369
PUT
McEwen Inc
MUX
$780M
| $1.4M | ﹤0.01% |
78,400
-19,800
| -20% | -$372K |
2021 Q2
21 quarters
|
|
2370
Cal-Maine
CALM
$3.12B
| $1.4M | ﹤0.01% |
+20,547
| New | +$1.66M |
2026 Q3
0 quarters
|
|
2371
Devon Energy
DVN
$51.2B
| $1.4M | ﹤0.01% |
30,374
-97,781
| -76% | -$4.49M |
2026 Q2
1 quarter
|
|
2372
CALL
State Street
STT
$47.4B
| $1.4M | ﹤0.01% |
8,000
+7,500
| +1,500% | +$1.39M |
2014 Q4
47 quarters
|
|
2373
PUT
Fundrise Innovation Fund
VCX
$850M
| $1.4M | ﹤0.01% |
47,100
+26,500
| +129% | +$1.14M |
2026 Q2
1 quarter
|
|
2374
Crown Castle
CCI
$37.9B
| $1.39M | ﹤0.01% |
20,912
-4,549
| -18% | -$341K |
2025 Q1
6 quarters
|
|
2375
CALL
Legend Biotech
LEGN
$3.8B
| $1.39M | ﹤0.01% |
69,900
+38,800
| +125% | +$828K |
2021 Q1
22 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.